** Changed in: gnome-shell (Ubuntu Noble)
Milestone: None => noble-updates
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https://bugs.launchpad.net/bugs/2039340
Title:
gnome-shell (login screen) crashes with SIGSEGV in
__GI_getenv("EXPAT_ACCOUNTING_DEBUG") from getDebugLevel() from
parserInit()
Status in Mutter:
New
Status in gnome-shell package in Ubuntu:
Fix Released
Status in gnome-shell source package in Noble:
In Progress
Bug description:
[ Impact ]
gnome-shell may crash on startup due to multiple threads writing and
reading environment variables.
gnome-shell adds variables like DISPLAY, XAUTHORITY, WAYLAND_DISPLAY
to its own environment. However it might do so while libraries running
in other threads are trying to read environment variables that may
affect their behaviour. If a call to `getenv` is interrupted by a call
to `setenv` that causes re-allocation of memory, it will trigger a
crash.
To mitigate the issue, we avoid starting the fontconfig thread right
before setting the environment variables.
[ Test Plan ]
There are no reproducer steps that trigger the crash reliably enough to be
verified.
Instead, we are going to verify that the patch does not introduce
regressions, and will verify the effectiveness of the fix by monitoring
errors.ubuntu.com after the update has landed.
1. Install the gnome-shell update
2. Reboot
3. Verify that the log-in screen loaded correctly
4. Log-in
5. Verify that the desktop loaded correctly
6. Verify that the font rendering quality is not degraded
[ Where problems could occur ]
The patch delays the disablement of text mipmapping to the first time
a font is rendered, instead of doing so on startup. A mistake in the
patch could thus affect font rendering. The test plan asks to verify
that that is not the case.
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