Bug#814419: xorg: Xorg crashes randomly.
The same Xorg version, the same error message, and similar backtrace:
[ 3812.964] (EE) Backtrace:
[ 3812.964] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x56150d89149e]
[ 3812.964] (EE) 1: /usr/lib/xorg/Xorg (0x56150d6dc000+0x1b9819) [0x56150d895819]
[ 3812.964] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f5a15877000+0x33590) [0x7f5a158aa590]
[ 3812.964] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (0x7f5a15877000+0x785e8) [0x7f5a158ef5e8]
[ 3812.964] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6 (__libc_calloc+0xd5) [0x7f5a158f2395]
[ 3812.964] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f5a1121a000+0x105d95) [0x7f5a1131fd95]
[ 3812.964] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f5a1121a000+0x106c43) [0x7f5a11320c43]
[ 3812.964] (EE) 7: /usr/lib/xorg/Xorg (DRI2WaitMSC+0x6e) [0x56150d863e2e]
[ 3812.964] (EE) 8: /usr/lib/xorg/Xorg (0x56150d6dc000+0x1891e6) [0x56150d8651e6]
[ 3812.964] (EE) 9: /usr/lib/xorg/Xorg (0x56150d6dc000+0x53a3f) [0x56150d72fa3f]
[ 3812.964] (EE) 10: /usr/lib/xorg/Xorg (0x56150d6dc000+0x57a53) [0x56150d733a53]
[ 3812.964] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f5a15897870]
[ 3812.964] (EE) 12: /usr/lib/xorg/Xorg (_start+0x29) [0x56150d71dde9]
[ 3812.964] (EE)
[ 3812.964] (EE) Bus error at address 0x0
[ 3812.964] (EE)
Fatal server error:
[ 3812.964] (EE) Caught signal 7 (Bus error). Server aborting
This bug on freedesktop.org https://bugs.freedesktop.org/show_bug.cgi?id=93848 has some similar logs as well, and might be related (haven't checked the version, though).
In my case X server seems to abort when I'm using Java programs - see e.g. a similar report http://comments.gmane.org/gmane.comp.gis.openstreetmap.josm.devel/6516 .
Replacing openjdk-7-jre with openjdk-8-jre seemed to have fixed the problem for one Java program (had no crashes anymore with it), but still causes crashes while using PyCharm.
Note that crashing is not immediate: I can use the program for a few minutes before X crashes.
I have not yet had any crashes when NOT using Java programs.
HTH,
Bogdan
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