453534 – kcalc process always takes nearly 100% of a CPU thread when it's running

Bug 453534 - kcalc process always takes nearly 100% of a CPU thread when it's running

Summary: kcalc process always takes nearly 100% of a CPU thread when it's running

Status:	REOPENED

Alias:	None

Product:	kcalc
Classification:	Applications
Component:	general (other bugs)
Version First Reported In:	22.04.3
Platform:	unspecified Linux

Importance:	NOR major
Target Milestone:	---
Assignee:	Evan Teran

URL:
Keywords:

Duplicates (3):	456301 458308 465443 (view as bug list)
Depends on:
Blocks:

Reported:	2022-05-08 11:38 UTC by kevinfocke1
Modified:	2026-05-29 11:45 UTC (History)
CC List:	17 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
attachment-22895-0.html (1.86 KB, text/html) 2022-10-19 18:02 UTC, dmbtech	Details
attachment-3597944-0.html (1.64 KB, text/html) 2024-09-07 22:32 UTC, sapphire	Details
View All Add an attachment

Note You need to log in before you can comment on or make changes to this bug.

Description kevinfocke1 2022-05-08 11:38:02 UTC

SUMMARY
kcalc process always takes nearly 100% of a CPU thread when it's running, so that the laptop turns hot and loud. The problem is only observed with kcalc, demanding software runs relatively quietly.


STEPS TO REPRODUCE
1. Start kcalc
2. leave the process running for a short while
3. close the window normally or kill the process

OBSERVED RESULT
laptop fans turn loud, top shows 95%+ CPU usage right after start
kcalc works and quits as expected otherwise
the CPU usage returns to normal after kcalc is closed

EXPECTED RESULT
kcalc should not take this amount of resources

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.17.5-arch1-1
(available in About System)
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
CPU/GPU: Ryzen 7 5700U as part of the Lenovo ThinkBook 14 G3 ACL
Bios Version: GQCN20WW(V1.06)
The problem has only been observed with kcalc

Comment 1 David Warner 2022-05-14 02:20:00 UTC

I'm seeing this with 22.04.1 (environment: Fedora 36, KDE Plasma 5.24.5, KDE Frameworks 5.93.0, Qt 5.15.3, Kernel 5.17.6, X11).

Comment 2 dmbtech 2022-05-21 13:02:01 UTC

I can confirm I am seeing this also with 22.04.1, but with Arch Linux, KDE Frameworks Version 5.94.0 , QT Version 5.15.4 (built against 5.15.3), 5.17.6-arch1-1.

Comment 3 dmbtech 2022-05-21 13:09:51 UTC

Couldn't figure out how to edit original comment. But also wanted mention, the cpu usage does not appear to occur with regular user, and strace I notice a loop of repeats when idle(not sure if this is useful):
...
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\f\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\n\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\3\0\0\0\0\0\0\0", 16)         = 8
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 20) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\1\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\t\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\n\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\3\0\0\0\0\0\0\0", 16)         = 8
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 20) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\1\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\t\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\22\0\30\0\6\0`\10(\0\0\0)\0\0\0 \0\0\0\22\0\0\0R\3\0\0\0\0\0\0"..., iov_len=116}], 1) = 116
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="+\0\1\0", iov_len=4}], 1) = 4
futex(0x7ffcc6377b48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base=";\3\5\0\17\0`\10\0\0\0\0\0\0\0\0\211\1\302\1\202\3\n\0\6\0`\10\17\0`\10"..., iov_len=76}], 1) = 76
poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, 0) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\v\0\0\0\0\0\0\0", 16)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\24\0\6\0\6\0`\10\263\1\0\0\6\0\0\0\0\0\0\0\4\0\0\0", iov_len=24}], 1) = 24
futex(0x7ffcc6377e48, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0
futex(0x5571f29d45d8, FUTEX_WAKE_PRIVATE, 1) = 0
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
write(5, "\1\0\0\0\0\0\0\0", 8)         = 8
^C--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
strace: Process 118801 detached

Comment 4 stefano.d 2022-06-19 19:13:59 UTC

I can confirm this. My system:

Operating System: openSUSE Tumbleweed 20220617
KDE Plasma Version: 5.25.0
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.2
Kernel Version: 5.18.4-1-default (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 1700 Eight-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2

Comment 5 roger.koot 2022-06-25 16:40:58 UTC

If you resize the kcalc window, the cpu usage drops to expected values.

Comment 6 dmbtech 2022-06-25 16:43:42 UTC

(In reply to roger.koot from comment #5)
> If you resize the kcalc window, the cpu usage drops to expected values.

Wow, totally right. Resizing drops cpu to normal levels. Any idea why?

Comment 7 roger.koot 2022-06-25 17:15:21 UTC

(In reply to dmbtech from comment #6)
> (In reply to roger.koot from comment #5)
> > If you resize the kcalc window, the cpu usage drops to expected values.
> 
> Wow, totally right. Resizing drops cpu to normal levels. Any idea why?

Regrettably not. It was just a hunch. Could well be something X11 related but I haven't tested this under Wayland though. I don't even know whether the kcalc-100% bug is triggered on Wayland.

Comment 8 Ryan Ronnander 2022-07-19 16:34:35 UTC

(In reply to roger.koot from comment #5)
> If you resize the kcalc window, the cpu usage drops to expected values.

Wow, this actually works, but upon closing and reopening kcalc, the behavior resumes until resized.

I cannot reproduce this on other KDE systems. The menu rapidly flickers when this bug occurs, as if some redraw event is constantly being executed until the window is resized. I believe I've tried this on both X11 and Wayland, both hit 100% CPU usage.

Comment 9 cslcm 2022-09-13 10:11:53 UTC

Just to note that I see this also on Gentoo with kcalc-22.04.3

I have 2 x 4k monitors with 150% global scale - given the previous comments, maybe this is relevant

Comment 10 Petter Förster 2022-10-19 17:49:01 UTC

Just wanted to add that I can still confirm this with KCalc version 22.08.2.

The menu is flickering for me, too. Also, resizing fixes the problem for me.

-- System information --
Operating System: EndeavourOS
KDE Plasma Version: 5.26.1
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6
Kernel Version: 6.0.2-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i7-10710U CPU @ 1.10GHz
Memory: 15,3 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics
Manufacturer: Intel(R) Client Systems
Product Name: NUC10i7FNK

Comment 11 dmbtech 2022-10-19 18:02:42 UTC

Created attachment 153041 [details]
attachment-22895-0.html

Just a thought... Could this have to do with hidpi scaling?

On Wed, Oct 19, 2022, 1:49 PM P. Förster <bugzilla_noreply@kde.org> wrote:

> https://bugs.kde.org/show_bug.cgi?id=453534
>
> P. Förster <kde.p-foerster@gmx.de> changed:
>
>            What    |Removed                     |Added
>
> ----------------------------------------------------------------------------
>                  CC|                            |kde.p-foerster@gmx.de
>
> --- Comment #10 from P. Förster <kde.p-foerster@gmx.de> ---
> Just wanted to add that I can still confirm this with KCalc version
> 22.08.2.
>
> The menu is flickering for me, too. Also, resizing fixes the problem for
> me.
>
> -- System information --
> Operating System: EndeavourOS
> KDE Plasma Version: 5.26.1
> KDE Frameworks Version: 5.99.0
> Qt Version: 5.15.6
> Kernel Version: 6.0.2-arch1-1 (64-bit)
> Graphics Platform: X11
> Processors: 12 × Intel® Core™ i7-10710U CPU @ 1.10GHz
> Memory: 15,3 GiB of RAM
> Graphics Processor: Mesa Intel® UHD Graphics
> Manufacturer: Intel(R) Client Systems
> Product Name: NUC10i7FNK
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.

Comment 12 Diego 2023-02-24 14:16:06 UTC

To me the issue is most evident when you open the bit edit view: "Settings → Show bit edit".

May be related to:
https://bugs.kde.org/show_bug.cgi?id=453775

Comment 13 David Warner 2023-04-22 12:49:11 UTC

I'm not seeing this on a fresh Fedora 38 install with KCalc 23.04.0 (Plasma 5.27.4, KDE Frameworks 5.105.0, Qt 5.15.9, X11), though I'm sure it was still happening on my previous Fedora 37 install with the same versions. I'm confused, but happy if it's fixed.

Comment 14 Kirill 2023-11-30 19:26:28 UTC

I have it reproducible for a long time.

Also, when, just after KCalc starts, I hover mouse pointer on drop-down menu on top, it became stroboscopic - quickly light up and light down like disco.

And yes, I use 150% scaling in display settings if this is somehow related.

kcalc 23.08.3-1

Operating System: Manjaro Linux 
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.112.0
Qt Version: 5.15.11
Kernel Version: 6.6.2-1-MANJARO (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 5800H with Radeon Graphics
Memory: 62.1 GB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: HP
Product Name: Victus by HP Laptop 16-e0xxx

Comment 15 popov895 2024-06-19 13:18:42 UTC

*** Bug 458308 has been marked as a duplicate of this bug. ***

Comment 16 popov895 2024-06-19 13:21:11 UTC

*** Bug 456301 has been marked as a duplicate of this bug. ***

Comment 17 popov895 2024-06-19 13:22:03 UTC

*** Bug 465443 has been marked as a duplicate of this bug. ***

Comment 18 popov895 2024-06-19 13:25:22 UTC

Cannot reproduce with KCalc 24.05.1.

Comment 19 zvova7890 2024-06-20 14:43:43 UTC

Same, can't reproduce anymore on KDE6 and Kcalc 24.05.1

Comment 20 Gabriel Barrantes 2024-09-07 22:25:31 UTC

Can't reproduce, wait if reporter still have the issue.

Comment 21 sapphire 2024-09-07 22:31:59 UTC

Created attachment 173422 [details]
attachment-3597944-0.html

I would close this bug.
It seems to have been fixed already.

Thank You

On Sat, Sep 7, 2024 at 4:25 PM Gabriel Barrantes <bugzilla_noreply@kde.org>
wrote:

> https://bugs.kde.org/show_bug.cgi?id=453534
>
> Gabriel Barrantes <gabriel.barrantes.dev@outlook.com> changed:
>
>            What    |Removed                     |Added
>
> ----------------------------------------------------------------------------
>                  CC|
> |gabriel.barrantes.dev@outlo
>                    |                            |ok.com
>          Resolution|---                         |WAITINGFORINFO
>              Status|REPORTED                    |NEEDSINFO
>
> --- Comment #20 from Gabriel Barrantes <gabriel.barrantes.dev@outlook.com>
> ---
> Can't reproduce, wait if reporter still have the issue.
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.

Comment 22 ilfat 2024-09-17 16:50:02 UTC

(In reply to sapphire from comment #21)
> Created attachment 173422 [details]
> attachment-3597944-0.html
> 
> I would close this bug.
> It seems to have been fixed already.

For the following configuration with a 150% screen scale, the problem is still relevant:

kcalc 23.08.4

Operating System: ROSA Fresh Desktop 2021.1
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.112.0
Qt Version: 5.15.10
Kernel Version: 6.6.51-zen3-1 (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 6800H with Radeon Graphics
Memory: 30.1 ГиБ of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: LENOVO
Product Name: 21D1
System Version: ThinkBook 16 G4+ ARA

Comment 23 ilfat 2024-09-17 17:03:45 UTC

(In reply to popov895 from comment #18)
> Cannot reproduce with KCalc 24.05.1.

Oh, I didn't notice that.

Comment 24 Bug Janitor Service 2024-10-02 03:47:21 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 25 Bug Janitor Service 2024-10-17 03:48:14 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.

Comment 26 Ben Scherrey 2026-05-29 11:45:28 UTC

A fix is up for review as merge request !229:
https://invent.kde.org/utilities/kcalc/-/merge_requests/229

Fix 100% CPU usage from resizeEvent feedback loop under fractional scaling

This issue has been plaguing me for a couple of years now and I thought it would just show up fixed one day. So this week I decided to take a look and found out why it hasn't. Understandable. Hopefully this will be accepted as a simple one-liner that can't break any future versions and us old people can continue to use the super convenient kcalc! I've been a KDE user since it and Qt were first released. Thanks.

KCalculator::resizeEvent() forces the window to minimumSize() whenever the current size is smaller, by calling resize(). That resize() delivers another resizeEvent, which re-runs the same check.

size() and minimumSize() are integer QSizes. Under fractional display scaling (I'm running at 150% on X11: KCalc 22.12.3, Qt 5.15.8, KF5 5.103.0, Plasma/KWin 5.27.5, kernel 6.12.43+deb12-amd64, Debian 12 "bookworm") Qt rounds scaled geometry to whole device pixels, and the rounded minimumSize() and the rounded realized window size can differ by one pixel. The exact "<" comparison therefore stays true on every pass, so the window resizes itself in a tight loop and pins a CPU core for as long as KCalc is open.

At integer scaling (100%/200%) the two values are equal after one pass and the loop never starts, which is why this reads as WORKSFORME for anyone on Wayland, integer scaling, or the Qt6 high-DPI path.

Only force a resize when the shortfall exceeds the rounding error (4px). This breaks the loop on every scale factor while preserving the existing workaround that grows the window to fit its content after restoring from a maximized state (added in 6ff969e3 / d5ae89b8); those size differences are far larger than the tolerance.

Verified on the 22.12 branch (the master Qt6 build was unavailable on my test machine; the resizeEvent logic is identical): per-second CPU of the kcalc process went from a sustained 95-97% of one core to a flat 0% from the first second, with normal sizing intact.