xcb_wait_for_reply deadlock
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
libxcb (Ubuntu) |
Expired
|
Medium
|
Unassigned |
Bug Description
I have a Qt application which hangs in startup. Stack trace:
(gdb) bt
#0 0xb77b5424 in __kernel_vsyscall ()
#1 0xb3d2084b in pthread_
#2 0xb2a1337b in ?? () from /usr/lib/
#3 0xb2a14b40 in ?? () from /usr/lib/
#4 0xb2a14e07 in xcb_wait_for_reply () from /usr/lib/
#5 0xb2a3bd0b in xcb_glx_
#6 0xa08a5740 in ?? () from /usr/lib/
#7 0xa08a8b9a in ?? () from /usr/lib/
#8 0xa08aa2f9 in ?? () from /usr/lib/
#9 0xa08bb1f9 in ?? () from /usr/lib/
#10 0xb41f57f9 in ?? () from /usr/lib/
#11 0xb41fccf4 in QGuiApplication
#12 0xb41fd704 in QGuiApplication
#13 0xb482bd4b in QApplicationPri
#14 0xb3f46972 in QCoreApplicatio
#15 0xb3f469f9 in QCoreApplicatio
#16 0xb41fe12a in QGuiApplication
#17 0xb47d8de8 in QApplication:
Google shows other reports about xcb_wait_for_reply deadlocking. This happens when starting the application
from .xsession file using nodm display manager. Starting the app from an x terminal works so i believe this is some kind of timing issue / race condition. The app in question is properietary so i cannot supply it to reproduce the issue, sorry.
Ubuntu version is Ubuntu 13.04 x86_32 with updates installed.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: libxcb1 1.8.1-2ubuntu2.1
ProcVersionSign
Uname: Linux 3.8.0-28-generic i686
NonfreeKernelMo
.proc.driver.
.proc.driver.
.proc.driver.
NVRM version: NVIDIA UNIX x86 Kernel Module 304.88 Wed Mar 27 14:31:12 PDT 2013
GCC version: gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-1ubuntu1)
.tmp.unity.
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: i386
CheckboxSubmission: 5411b7083f24135
CheckboxSystem: b845c366ea09c60
CompizPlugins: [core,composite
CompositorRunning: None
Date: Mon Aug 12 14:09:50 2013
DistUpgraded: 2013-05-22 13:40:23,672 DEBUG enabling apt cron job
DistroCodename: raring
DistroVariant: ubuntu
EcryptfsInUse: Yes
GraphicsCard:
NVIDIA Corporation GT216M [NVS 5100M] [10de:0a2c] (rev a2) (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Device [103c:1521]
InstallationDate: Installed on 2011-06-14 (790 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
JockeyStatus:
kmod:nvidia_
kmod:nvidia_
kmod:nvidia_304 - nvidia_304 (Proprietary, Enabled, Not in use)
kmod:nvidia_
kmod:nvidia_310 - NVIDIA binary Xorg driver, kernel module and VDPAU library (Proprietary, Disabled, Not in use)
MachineType: Hewlett-Packard HP EliteBook 8540p
MarkForUpload: True
PccardctlStatus:
Socket 0:
3.3V
16-bit
PC Card
Subdevice 0 (function 0) bound to driver "pata_pcmcia"
ProcKernelCmdLine: BOOT_IMAGE=
SourcePackage: libxcb
UpgradeStatus: Upgraded to raring on 2013-05-22 (82 days ago)
XorgConf:
Section "Device"
Identifier "Default Device"
Option "NoLogo" "True"
EndSection
dmi.bios.date: 03/09/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68CVD Ver. F.0F
dmi.board.name: 1521
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 32.33
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-
dmi.product.name: HP EliteBook 8540p
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.9~
version.libdrm2: libdrm2 2.4.43-0ubuntu1.1
version.
version.
version.
version.
version.
version.
version.
version.
version.
xserver.bootTime: Mon Aug 12 10:00:08 2013
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
open /dev/dri/card0: No such file or directory
open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
xserver.version: 2:1.13.3-0ubuntu6
During startup i use unclutter command to hide mouse pointer. It seems that the unclutter also fails and gets stuck in same situation:
(gdb) bt linux-gnu/ libc.so. 6 i386-linux- gnu/libxcb. so.1 i386-linux- gnu/libxcb. so.1 i386-linux- gnu/libxcb. so.1 i386-linux- gnu/libX11. so.6 i386-linux- gnu/libX11. so.6 linux-gnu/ libc.so. 6
#0 0xb7755424 in __kernel_vsyscall ()
#1 0xb7538da3 in poll () from /lib/i386-
#2 0xb743c200 in ?? () from /usr/lib/
#3 0xb743db40 in ?? () from /usr/lib/
#4 0xb743de07 in xcb_wait_for_reply () from /usr/lib/
#5 0xb7644692 in _XReply () from /usr/lib/
#6 0xb7639be3 in XQueryPointer () from /usr/lib/
#7 0x08048fdd in ?? ()
#8 0xb7470935 in __libc_start_main () from /lib/i386-
#9 0x080499b9 in ?? ()