Bug 405322

Summary: Negative "Relative Start Time" in Process Table after hibernation
Product: [Unmaintained] ksysguard Reporter: evandrocoan <evandrocoan>
Component: ksysguardAssignee: KSysGuard Developers <ksysguard-bugs>
Status: RESOLVED UNMAINTAINED    
Severity: normal CC: richard.llom, zrenfire
Priority: NOR    
Version First Reported In: 5.12.7   
Target Milestone: ---   
Platform: Mint (Debian based)   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description evandrocoan 2019-03-10 16:45:42 UTC 
SUMMARY
Shows negative `Relative Start Time` when the computer comes out from hibernation on the next and subsequent days.

STEPS TO REPRODUCE
1. Open KSysGuard.
2. Hibernate you computer.
3. Wake up your computer from hibernation (not sleep mode), later, 24 hours or more.

OBSERVED RESULT
It will show several program with negative relative start time.

EXPECTED RESULT
No program with negative relative start time.

SOFTWARE/OS VERSIONS
Linux (x86_64) Mint Xfce 19.1 Kernel release 4.15.0-46-generic
Comment 1 Chris Holland 2020-01-11 21:52:45 UTC 
I observe this regularly after putting my PC to sleep. I don't hibernate it, and I'm able to wake it with the spacebar.

Operating System: Manjaro Linux 
KDE Plasma Version: 5.17.4
KDE Frameworks Version: 5.65.0
Qt Version: 5.14.0
Kernel Version: 5.4.6-2-MANJARO

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Here's where the logic is calculated:

* https://github.com/KDE/libksysguard/blob/master/processui/ProcessModel.cpp#L1410
* https://github.com/KDE/libksysguard/blob/master/processui/ProcessModel.cpp#L1573

I think it's caused by TimeUtil::systemUptimeAbsolute(), as it takes the current time, and subtracts TimeUtil::systemUptimeSeconds()

* https://github.com/KDE/libksysguard/blob/master/processui/timeutil.h#L65
* https://github.com/KDE/libksysguard/blob/master/processui/timeutil.h#L45
* https://doc.qt.io/qt-5/qdatetime.html#currentDateTime

We're using CLOCK_MONOTONIC

> https://linux.die.net/man/3/clock_gettime
> CLOCK_MONOTONIC
>    Clock that cannot be set and represents monotonic time since some unspecified starting point.


I assume that it's taking the seconds since waking up and subtracting the seconds since the system's initial boot somewhere but I can't figure it out without some debug logging.
Comment 2 Christoph Cullmann 2024-09-23 21:00:22 UTC 
ksysguard is no longer maintained, in Plasma 6 there is the Plasma system monitor for this task.

If your issue still happens with the Plasma 6 replacement, please re-open and we can move this bug to the new product, thanks!