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[Launchpad Bug Tracker <1918855@xxxxxxxxxxxxxxxxxx>]

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== SRU Justification ==
[Impact]
When the system is under memory pressure, the entire desktop session may crash.

[Fix]
Commit f9d8d9acbb6a620684fb4dac4affe25816587d92 ("iris: Avoid abort() if kernel can't allocate memory")

[Test]
Run memory stress and the session crashed in less than 5 minutes.
With the fix applied, run memory stress for 24 hours and the desktop session is still alive.

[Where problems could occur]
Doing a reset might make the system even more sluggish when under memory pressure.


== Original bug report ==
I run checkbox job com.canonical.certification::memory/memory_stress_ng on focal, and the xserver stops unexpectedly with the following stacktrace:

/usr/lib/gdm3/gdm-x-session[1425]: (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x13c) [0x5619f3a4d59c]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 1: /lib/x86_64-linux-gnu/libpthread.so.0 (funlockfile+0x60) [0x7fae4786741f]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (gsignal+0xcb) [0x7fae476a418b]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 3: /lib/x86_64-linux-gnu/libc.so.6 (abort+0x12b) [0x7fae47683859]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) unw_get_proc_name failed: no unwind info found [-10]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 4: /usr/lib/x86_64-linux-gnu/dri/iris_dri.so (?+0x0) [0x7fae457d7aec]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 5: /usr/lib/x86_64-linux-gnu/dri/iris_dri.so (nouveau_drm_screen_create+0x25c8ec) [0x7fae46529c9c]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 6: /usr/lib/x86_64-linux-gnu/dri/iris_dri.so (__driDriverGetExtensions_zink+0x2561d) [0x7fae4582c74d]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 7: /usr/lib/xorg/modules/libglamoregl.so (glamor_destroy_pixmap+0x150) [0x7fae47007480]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) unw_get_proc_name failed: no unwind info found [-10]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 8: /usr/lib/xorg/modules/drivers/modesetting_drv.so (?+0x0) [0x7fae47040a30]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 9: /usr/lib/xorg/Xorg (BlockHandler+0xa5) [0x5619f38f0995]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 10: /usr/lib/xorg/Xorg (WaitForSomething+0x122) [0x5619f3a46c12]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 11: /usr/lib/xorg/Xorg (SendErrorToClient+0x117) [0x5619f38ebcf7]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 12: /usr/lib/xorg/Xorg (InitFonts+0x3b4) [0x5619f38effc4]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 13: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0x7fae476850b3]
/usr/lib/gdm3/gdm-x-session[1425]: (EE) 14: /usr/lib/xorg/Xorg (_start+0x2e) [0x5619f38d9a2e]

More info:
I searched the Internet and got a bug with the same stacktrace:
https://gitlab.freedesktop.org/mesa/mesa/-/issues/3468
https://gitlab.freedesktop.org/mesa/mesa/-/issues/2859

** Affects: oem-priority
     Importance: Critical
     Assignee: jeremyszu (os369510)
         Status: In Progress

** Affects: ubuntu-translations
     Importance: Undecided
         Status: New

** Affects: mesa (Ubuntu)
     Importance: Medium
     Assignee: Timo Aaltonen (tjaalton)
         Status: Fix Released

** Affects: mesa (Ubuntu Focal)
     Importance: Medium
     Assignee: Timo Aaltonen (tjaalton)
         Status: New

** Affects: mesa (Ubuntu Hirsute)
     Importance: Medium
     Assignee: Timo Aaltonen (tjaalton)
         Status: New


** Tags: oem-priority originate-from-1917692 originate-from-1929152 originate-from-1932285 patch somerville stella
-- 
Xorg xserver got signal 6 to abort
https://bugs.launchpad.net/bugs/1918855
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