| Summary: | Crash when unplugging USB video device | ||
|---|---|---|---|
| Product: | [Plasma] KScreen | Reporter: | Salvador I. Gonzalez <sgonzalez> |
| Component: | kded | Assignee: | Daniel Vrátil <dvratil> |
| Status: | RESOLVED FIXED | ||
| Severity: | crash | CC: | dvratil |
| Priority: | NOR | ||
| Version: | unspecified | ||
| Target Milestone: | --- | ||
| Platform: | Kubuntu | ||
| OS: | Linux | ||
| Latest Commit: | http://commits.kde.org/libkscreen/e888640086fb6ecac52ca89d9ebd9de273114a40 | Version Fixed In: | 5.3 |
| Sentry Crash Report: | |||
| Attachments: |
Manual XrandR config - Step 1 Pre Monitor Plugin
Manual XrandR config - Step 2 Post Monitor Plugin / Pre Screen Config Manual XrandR config - Step 3 Post Screen Config Manual XrandR config - Step 4 Post Monitor Unplug Kde GUI Screen Config - Step 1 Pre Monitor Plugin Kde GUI Screen Config - Step 2 Post Monitor Plugin / Pre Screen Config Kde GUI Screen Config - Step 3 Post Screen Config Kde GUI Screen Config - Step 4 Post Monitor Unplug |
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We might not be dealing with disappearance of an actual output very well. Could you please provide output of "xrandr --verbose" with the device plugged in and unplugged? Created attachment 91484 [details]
Manual XrandR config - Step 1 Pre Monitor Plugin
Created attachment 91485 [details]
Manual XrandR config - Step 2 Post Monitor Plugin / Pre Screen Config
Created attachment 91486 [details]
Manual XrandR config - Step 3 Post Screen Config
Created attachment 91487 [details]
Manual XrandR config - Step 4 Post Monitor Unplug
Created attachment 91488 [details]
Kde GUI Screen Config - Step 1 Pre Monitor Plugin
Created attachment 91489 [details]
Kde GUI Screen Config - Step 2 Post Monitor Plugin / Pre Screen Config
Created attachment 91490 [details]
Kde GUI Screen Config - Step 3 Post Screen Config
Created attachment 91491 [details]
Kde GUI Screen Config - Step 4 Post Monitor Unplug
I have attached `xrandr --verbose` output for every discreet step in the process of plugging/unplugging the monitor. I tried it both with configuring the second monitor on the CLI with xrandr, and then again with the KDE Utility. Rebooted in between attempts to ensure a clean environment. Both ways cause the crash upon unplugging. In case it helps, here are the commands I run on the CLI to configure the second monitor: xrandr --rmmode "1368x768_60.20" xrandr --newmode "1368x768_60.20" 86.15 1368 1440 1584 1800 768 769 772 795 -HSync +Vsync && xrandr --addmode DVI-1-0 1368x768_60.20 && xrandr --output DVI-1-0 --mode 1368x768_60.20 --left-of LVDS --noprimary Thanks for the update, changing status. Thanks, indeed plugging and unplugging the video device causes a new output to appear/disappear, and we don't handle this in our code correctly (at all), which leads to various crashes. Git commit e888640086fb6ecac52ca89d9ebd9de273114a40 by Dan Vrátil. Committed on 26/03/2015 at 16:29. Pushed by dvratil into branch 'master'. XRandR: correctly handle output disappearing This can happen for example when user unplugs an external GPU. FIXED-IN: 5.3 M +16 -2 backends/xrandr/xrandr.cpp M +2 -5 backends/xrandr/xrandrconfig.cpp M +1 -6 backends/xrandr/xrandrconfig.h M +0 -3 backends/xrandr/xrandroutput.h http://commits.kde.org/libkscreen/e888640086fb6ecac52ca89d9ebd9de273114a40 Git commit 3a0c9330cf8ffe34351cd5c7838fa394212b5af5 by Dan Vrátil. Committed on 26/03/2015 at 16:30. Pushed by dvratil into branch 'master'. KCM: properly handle outputs appearing and disappearing at runtime M +34 -10 kcm/src/controlpanel.cpp M +4 -0 kcm/src/controlpanel.h M +54 -57 kcm/src/declarative/qmlscreen.cpp M +3 -7 kcm/src/declarative/qmlscreen.h M +3 -1 kcm/src/outputconfig.cpp M +6 -0 kcm/src/widget.cpp http://commits.kde.org/kscreen/3a0c9330cf8ffe34351cd5c7838fa394212b5af5 Thank you for your help! |
Application: kded4 (4.13.3) KDE Platform Version: 4.13.3 Qt Version: 4.8.6 Operating System: Linux 3.13.0-39-generic x86_64 Distribution: Ubuntu 14.04.1 LTS -- Information about the crash: - What I was doing when the application crashed: Removed USB Monitor driver - AOC e1649Fwu, using udl kernel driver. This moitor requires a special modeline to work properly, the auto-config in KDE does not work: xrandr --newmode "1368x768_60.20" 86.15 1368 1440 1584 1800 768 769 772 795 -HSync +Vsync lsusb for device: Bus 001 Device 003: ID 1210:2604 DigiTech Couldn't open device, some information will be missing Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 ? bDeviceProtocol 1 Interface Association bMaxPacketSize0 64 idVendor 0x1210 DigiTech idProduct 0x2604 bcdDevice 0.01 iManufacturer 1 iProduct 2 iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 512 bNumInterfaces 2 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 500mA Interface Association: bLength 8 bDescriptorType 11 bFirstInterface 0 bInterfaceCount 2 bFunctionClass 14 Video bFunctionSubClass 3 Video Interface Collection bFunctionProtocol 0 iFunction 4 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 1 Video Control bInterfaceProtocol 0 iInterface 4 VideoControl Interface Descriptor: bLength 13 bDescriptorType 36 bDescriptorSubtype 1 (HEADER) bcdUVC 1.00 wTotalLength 78 dwClockFrequency 30.000000MHz bInCollection 1 baInterfaceNr( 0) 1 VideoControl Interface Descriptor: bLength 27 bDescriptorType 36 bDescriptorSubtype 6 (EXTENSION_UNIT) bUnitID 6 guidExtensionCode {b0d0bb68-a461-834b-90b7-a6215f3c4f70} bNumControl 16 bNrPins 1 baSourceID( 0) 2 bControlSize 2 bmControls( 0) 0xff bmControls( 1) 0xff iExtension 0 VideoControl Interface Descriptor: bLength 18 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 1 wTerminalType 0x0201 Camera Sensor bAssocTerminal 0 iTerminal 0 wObjectiveFocalLengthMin 0 wObjectiveFocalLengthMax 0 wOcularFocalLength 0 bControlSize 3 bmControls 0x00000000 VideoControl Interface Descriptor: bLength 11 bDescriptorType 36 bDescriptorSubtype 5 (PROCESSING_UNIT) Warning: Descriptor too short bUnitID 2 bSourceID 1 wMaxMultiplier 0 bControlSize 2 bmControls 0x0000157f Brightness Contrast Hue Saturation Sharpness Gamma White Balance Temperature Backlight Compensation Power Line Frequency White Balance Temperature, Auto iProcessing 0 bmVideoStandards 0x 9 None SECAM - 625/50 VideoControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID 3 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bSourceID 2 iTerminal 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0010 1x 16 bytes bInterval 7 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 4 VideoStreaming Interface Descriptor: bLength 14 bDescriptorType 36 bDescriptorSubtype 1 (INPUT_HEADER) bNumFormats 1 wTotalLength 323 bEndPointAddress 130 bmInfo 0 bTerminalLink 3 bStillCaptureMethod 2 bTriggerSupport 1 bTriggerUsage 0 bControlSize 1 bmaControls( 0) 27 VideoStreaming Interface Descriptor: bLength 27 bDescriptorType 36 bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED) bFormatIndex 1 bNumFrameDescriptors 5 guidFormat {59555932-0000-1000-8000-00aa00389b71} bBitsPerPixel 16 bDefaultFrameIndex 1 bAspectRatioX 0 bAspectRatioY 0 bmInterlaceFlags 0x00 Interlaced stream or variable: No Fields per frame: 2 fields Field 1 first: No Field pattern: Field 1 only bCopyProtect 0 VideoStreaming Interface Descriptor: bLength 50 bDescriptorType 36 bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) bFrameIndex 1 bmCapabilities 0x00 Still image unsupported wWidth 640 wHeight 480 dwMinBitRate 3072000 dwMaxBitRate 18432000 dwMaxVideoFrameBufferSize 614400 dwDefaultFrameInterval 333333 bFrameIntervalType 6 dwFrameInterval( 0) 333333 dwFrameInterval( 1) 400000 dwFrameInterval( 2) 500000 dwFrameInterval( 3) 666666 dwFrameInterval( 4) 1000000 dwFrameInterval( 5) 2000000 VideoStreaming Interface Descriptor: bLength 50 bDescriptorType 36 bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) bFrameIndex 2 bmCapabilities 0x00 Still image unsupported wWidth 352 wHeight 288 dwMinBitRate 1013760 dwMaxBitRate 6082560 dwMaxVideoFrameBufferSize 202752 dwDefaultFrameInterval 333333 bFrameIntervalType 6 dwFrameInterval( 0) 333333 dwFrameInterval( 1) 400000 dwFrameInterval( 2) 500000 dwFrameInterval( 3) 666666 dwFrameInterval( 4) 1000000 dwFrameInterval( 5) 2000000 VideoStreaming Interface Descriptor: bLength 50 bDescriptorType 36 bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) bFrameIndex 3 bmCapabilities 0x00 Still image unsupported wWidth 320 wHeight 240 dwMinBitRate 768000 dwMaxBitRate 4608000 dwMaxVideoFrameBufferSize 153600 dwDefaultFrameInterval 333333 bFrameIntervalType 6 dwFrameInterval( 0) 333333 dwFrameInterval( 1) 400000 dwFrameInterval( 2) 500000 dwFrameInterval( 3) 666666 dwFrameInterval( 4) 1000000 dwFrameInterval( 5) 2000000 VideoStreaming Interface Descriptor: bLength 50 bDescriptorType 36 bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) bFrameIndex 4 bmCapabilities 0x00 Still image unsupported wWidth 176 wHeight 144 dwMinBitRate 253440 dwMaxBitRate 1520640 dwMaxVideoFrameBufferSize 50688 dwDefaultFrameInterval 333333 bFrameIntervalType 6 dwFrameInterval( 0) 333333 dwFrameInterval( 1) 400000 dwFrameInterval( 2) 500000 dwFrameInterval( 3) 666666 dwFrameInterval( 4) 1000000 dwFrameInterval( 5) 2000000 VideoStreaming Interface Descriptor: bLength 50 bDescriptorType 36 bDescriptorSubtype 5 (FRAME_UNCOMPRESSED) bFrameIndex 5 bmCapabilities 0x00 Still image unsupported wWidth 160 wHeight 120 dwMinBitRate 192000 dwMaxBitRate 1152000 dwMaxVideoFrameBufferSize 38400 dwDefaultFrameInterval 333333 bFrameIntervalType 6 dwFrameInterval( 0) 333333 dwFrameInterval( 1) 400000 dwFrameInterval( 2) 500000 dwFrameInterval( 3) 666666 dwFrameInterval( 4) 1000000 dwFrameInterval( 5) 2000000 VideoStreaming Interface Descriptor: bLength 26 bDescriptorType 36 bDescriptorSubtype 3 (STILL_IMAGE_FRAME) bEndpointAddress 0 bNumImageSizePatterns 5 wWidth( 0) 640 wHeight( 0) 480 wWidth( 1) 352 wHeight( 1) 288 wWidth( 2) 320 wHeight( 2) 240 wWidth( 3) 176 wHeight( 3) 144 wWidth( 4) 160 wHeight( 4) 120 bNumCompressionPatterns 5 VideoStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 13 (COLORFORMAT) bColorPrimaries 1 (BT.709,sRGB) bTransferCharacteristics 1 (BT.709) bMatrixCoefficients 4 (SMPTE 170M (BT.601)) Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 4 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x1400 3x 1024 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 2 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 4 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0c00 2x 1024 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 3 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 4 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 4 bNumEndpoints 1 bInterfaceClass 14 Video bInterfaceSubClass 2 Video Streaming bInterfaceProtocol 0 iInterface 4 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 1 The crash can be reproduced every time. -- Backtrace: Application: KDE Daemon (kded4), signal: Segmentation fault Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". [Current thread is 1 (Thread 0x7ff7c7ae67c0 (LWP 2494))] Thread 6 (Thread 0x7ff7ab68a700 (LWP 2509)): #0 qt_gettime () at tools/qelapsedtimer_unix.cpp:142 #1 0x00007ff7c6786f05 in updateCurrentTime (this=0x7ff7a4003130) at kernel/qeventdispatcher_unix.cpp:354 #2 QTimerInfoList::timerWait (this=0x7ff7a4003130, tm=...) at kernel/qeventdispatcher_unix.cpp:460 #3 0x00007ff7c678567c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7ff7ab689c64) at kernel/qeventdispatcher_glib.cpp:143 #4 0x00007ff7c6785725 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:176 #5 0x00007ff7c244968d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #6 0x00007ff7c2449f03 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #7 0x00007ff7c244a0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #8 0x00007ff7c67857be in QEventDispatcherGlib::processEvents (this=0x7ff7a40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436 #9 0x00007ff7c67570af in QEventLoop::processEvents (this=this@entry=0x7ff7ab689e20, flags=...) at kernel/qeventloop.cpp:149 #10 0x00007ff7c67573a5 in QEventLoop::exec (this=this@entry=0x7ff7ab689e20, flags=...) at kernel/qeventloop.cpp:204 #11 0x00007ff7c6653c5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537 #12 0x00007ff7c665632f in QThreadPrivate::start (arg=0x20d08b0) at thread/qthread_unix.cpp:349 #13 0x00007ff7c2b2c182 in start_thread (arg=0x7ff7ab68a700) at pthread_create.c:312 #14 0x00007ff7c5358fbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111 Thread 5 (Thread 0x7ff79a237700 (LWP 2528)): #0 0x00007ff7c6786ef9 in QTimerInfoList::timerWait (this=0x7ff780003130, tm=...) at kernel/qeventdispatcher_unix.cpp:459 #1 0x00007ff7c678567c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7ff79a236c24) at kernel/qeventdispatcher_glib.cpp:143 #2 0x00007ff7c6785725 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:176 #3 0x00007ff7c244968d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #4 0x00007ff7c2449f03 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #5 0x00007ff7c244a0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #6 0x00007ff7c67857be in QEventDispatcherGlib::processEvents (this=0x7ff7800008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436 #7 0x00007ff7c67570af in QEventLoop::processEvents (this=this@entry=0x7ff79a236de0, flags=...) at kernel/qeventloop.cpp:149 #8 0x00007ff7c67573a5 in QEventLoop::exec (this=this@entry=0x7ff79a236de0, flags=...) at kernel/qeventloop.cpp:204 #9 0x00007ff7c6653c5f in QThread::exec (this=this@entry=0x21f0400) at thread/qthread.cpp:537 #10 0x00007ff7c6738823 in QInotifyFileSystemWatcherEngine::run (this=0x21f0400) at io/qfilesystemwatcher_inotify.cpp:265 #11 0x00007ff7c665632f in QThreadPrivate::start (arg=0x21f0400) at thread/qthread_unix.cpp:349 #12 0x00007ff7c2b2c182 in start_thread (arg=0x7ff79a237700) at pthread_create.c:312 #13 0x00007ff7c5358fbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111 Thread 4 (Thread 0x7ff799830700 (LWP 2532)): #0 0x00007ff7c534bc6d in poll () at ../sysdeps/unix/syscall-template.S:81 #1 0x00007ff7c2449fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007ff7c244a0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007ff7c67857be in QEventDispatcherGlib::processEvents (this=0x7ff7840008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436 #4 0x00007ff7c67570af in QEventLoop::processEvents (this=this@entry=0x7ff79982fde0, flags=...) at kernel/qeventloop.cpp:149 #5 0x00007ff7c67573a5 in QEventLoop::exec (this=this@entry=0x7ff79982fde0, flags=...) at kernel/qeventloop.cpp:204 #6 0x00007ff7c6653c5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537 #7 0x00007ff7a8a77027 in KCupsConnection::run() () from /usr/lib/libkcupslib.so #8 0x00007ff7c665632f in QThreadPrivate::start (arg=0x20ffdf0) at thread/qthread_unix.cpp:349 #9 0x00007ff7c2b2c182 in start_thread (arg=0x7ff799830700) at pthread_create.c:312 #10 0x00007ff7c5358fbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111 Thread 3 (Thread 0x7ff79902f700 (LWP 2533)): #0 0x00007ff7c2449bda in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #1 0x00007ff7c244a048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007ff7c244a0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007ff7c67857be in QEventDispatcherGlib::processEvents (this=0x7ff7780008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436 #4 0x00007ff7c67570af in QEventLoop::processEvents (this=this@entry=0x7ff79902ee20, flags=...) at kernel/qeventloop.cpp:149 #5 0x00007ff7c67573a5 in QEventLoop::exec (this=this@entry=0x7ff79902ee20, flags=...) at kernel/qeventloop.cpp:204 #6 0x00007ff7c6653c5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537 #7 0x00007ff7c665632f in QThreadPrivate::start (arg=0x22e1c40) at thread/qthread_unix.cpp:349 #8 0x00007ff7c2b2c182 in start_thread (arg=0x7ff79902f700) at pthread_create.c:312 #9 0x00007ff7c5358fbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111 Thread 2 (Thread 0x7ff77fdad700 (LWP 2544)): #0 0x00007ff7c248b61a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #1 0x00007ff7c248b9a9 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007ff7c2449680 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007ff7c2449f03 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #4 0x00007ff7c244a0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #5 0x00007ff7c67857be in QEventDispatcherGlib::processEvents (this=0x7ff7680008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436 #6 0x00007ff7c67570af in QEventLoop::processEvents (this=this@entry=0x7ff77fdacde0, flags=...) at kernel/qeventloop.cpp:149 #7 0x00007ff7c67573a5 in QEventLoop::exec (this=this@entry=0x7ff77fdacde0, flags=...) at kernel/qeventloop.cpp:204 #8 0x00007ff7c6653c5f in QThread::exec (this=this@entry=0x23818e0) at thread/qthread.cpp:537 #9 0x00007ff7c6738823 in QInotifyFileSystemWatcherEngine::run (this=0x23818e0) at io/qfilesystemwatcher_inotify.cpp:265 #10 0x00007ff7c665632f in QThreadPrivate::start (arg=0x23818e0) at thread/qthread_unix.cpp:349 #11 0x00007ff7c2b2c182 in start_thread (arg=0x7ff77fdad700) at pthread_create.c:312 #12 0x00007ff7c5358fbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111 Thread 1 (Thread 0x7ff7c7ae67c0 (LWP 2494)): [KCrash Handler] #5 0x00007ff7a996638b in XRandROutput::updateOutput(_XRROutputInfo const*) () from /usr/lib/kde4/plugins/kscreen/KSC_XRandR.so #6 0x00007ff7a9965f44 in XRandROutput::XRandROutput(int, bool, XRandRConfig*) () from /usr/lib/kde4/plugins/kscreen/KSC_XRandR.so #7 0x00007ff7a995c8ad in XRandRConfig::createNewOutput(unsigned long, bool) () from /usr/lib/kde4/plugins/kscreen/KSC_XRandR.so #8 0x00007ff7a995c830 in XRandRConfig::addNewOutput(unsigned long) () from /usr/lib/kde4/plugins/kscreen/KSC_XRandR.so #9 0x00007ff7a995957a in XRandR::updateOutput(unsigned long) () from /usr/lib/kde4/plugins/kscreen/KSC_XRandR.so #10 0x00007ff7a9959edf in XRandR::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/kde4/plugins/kscreen/KSC_XRandR.so #11 0x00007ff7c676c87a in QMetaObject::activate (sender=0x20e4c20, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff8a729bf0) at kernel/qobject.cpp:3539 #12 0x00007ff7a995c2f5 in XRandRX11Helper::outputChanged(unsigned long) () from /usr/lib/kde4/plugins/kscreen/KSC_XRandR.so #13 0x00007ff7a995bcde in XRandRX11Helper::x11Event(_XEvent*) () from /usr/lib/kde4/plugins/kscreen/KSC_XRandR.so #14 0x00007ff7c74fdeb8 in ?? () from /usr/lib/libkdeui.so.5 #15 0x00007ff7c674a35e in QAbstractEventDispatcher::filterEvent (this=0x3dda8d0, message=0x0, message@entry=0x7fff8a729da0) at kernel/qabstracteventdispatcher.cpp:542 #16 0x00007ff7c5b93a30 in x11EventSourceDispatch (s=0x1ed5e00, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:143 #17 0x00007ff7c2449e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #18 0x00007ff7c244a048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #19 0x00007ff7c244a0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #20 0x00007ff7c67857be in QEventDispatcherGlib::processEvents (this=0x1e3d6d0, flags=...) at kernel/qeventdispatcher_glib.cpp:436 #21 0x00007ff7c5b93bb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204 #22 0x00007ff7c67570af in QEventLoop::processEvents (this=this@entry=0x7fff8a72a170, flags=...) at kernel/qeventloop.cpp:149 #23 0x00007ff7c67573a5 in QEventLoop::exec (this=this@entry=0x7fff8a72a170, flags=...) at kernel/qeventloop.cpp:204 #24 0x00007ff7c675cb79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225 #25 0x00007ff7b0f6cd1b in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_kded4.so #26 0x00000000004083ee in _start () Report to https://bugs.kde.org/ Reproducible: Always Steps to Reproduce: 1. Plug in USB Monitor 2. Set proper modeline & enable display 3. Un-plug device Actual Results: Crash Expected Results: No Crash