The crash is in XorgLogOld.txt, and the backtrace reproduced here:
[ 9027.274] (EE) Backtrace:
[ 9027.274] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x139) [0x55b9210ba229]
[ 9027.275] (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x50)
[0x7fdf6dcc4e1f]
[ 9027.275] (EE) 2: /usr/lib/xorg/Xorg (ResetCurrentRequest+0xb)
[0x55b9210b92ab]
[ 9027.275] (EE) 3: /usr/lib/xorg/Xorg (DRI2WaitSwap+0x56) [0x55b921086716]
[ 9027.275] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 9027.275] (EE) 4: /usr/lib/xorg/modules/extensions/libglx.so (?+0x0)
[0x7fdf6c7faa20]
[ 9027.276] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 9027.276] (EE) 5: /usr/lib/xorg/modules/extensions/libglx.so (?+0x0)
[0x7fdf6c7f3010]
[ 9027.276] (EE) unw_get_proc_name failed: no unwind info found [-10]
[ 9027.276] (EE) 6: /usr/lib/xorg/modules/extensions/libglx.so (?+0x0)
[0x7fdf6c7eefd0]
[ 9027.276] (EE) 7: /usr/lib/xorg/Xorg (dri3_send_open_reply+0xe2a)
[0x55b92108b12a]
[ 9027.277] (EE) 8: /usr/lib/xorg/Xorg (_CallCallbacks+0x34) [0x55b920f60be4]
[ 9027.277] (EE) 9: /usr/lib/xorg/Xorg (CloseDownClient+0x5f) [0x55b920f5acbf]
[ 9027.277] (EE) 10: /usr/lib/xorg/Xorg (OsCleanup+0x591) [0x55b9210bb021]
[ 9027.277] (EE) 11: /usr/lib/xorg/Xorg (WaitForSomething+0x1c3)
[0x55b9210b3b93]
[ 9027.277] (EE) 12: /usr/lib/xorg/Xorg (SendErrorToClient+0x10c)
[0x55b920f5b72c]
[ 9027.277] (EE) 13: /usr/lib/xorg/Xorg (InitFonts+0x3b6) [0x55b920f5f906]
[ 9027.278] (EE) 14: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xeb)
[0x7fdf6daea09b]
[ 9027.278] (EE) 15: /usr/lib/xorg/Xorg (_start+0x2a) [0x55b920f4967a]
[ 9027.278] (EE)
[ 9027.278] (EE) Segmentation fault at address 0x8
[ 9027.278] (EE)
Fatal server error:
[ 9027.278] (EE) Caught signal 11 (Segmentation fault). Server aborting
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https://bugs.launchpad.net/bugs/1820074
Title:
Running glxgears with Indirect GLX crashes Xorg
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