gnome-shell (>= 44) fails its build-time tests on the mips64el porterbox
'eller', using llvmpipe for 3D graphics. I don't know whether a simpler
accelerated 3D application would reproduce the same crash.

According to mips porter YunQiang Su, the same version of
gnome-shell works well on an AMD GPU, so this is an llvmpipe-specific
bug. Unfortunately, llvmpipe is the only thing we have available for
smoke-testing on buildds and other infrastructure.

To reproduce this with a current version of gnome-shell, it will be
necessary to remove this workaround from debian/rules:

ifneq ($(filter mips%,$(DEB_HOST_ARCH_CPU)),)
# gnome-shell on mips(64)el works on a real GPU (in practice usually an
# AMD GPU), but crashes when using llvmpipe or softpipe, which is all that
# is available on the buildds, so we only run the unit tests at build time
# and skip the tests that would run the whole Shell. See discussion in
# https://salsa.debian.org/gnome-team/gnome-shell/-/merge_requests/71
meson_test_options += --no-suite shell
endif

This might have the same root cause as some or all of #868745, #935884,
#1010838, #993550, #1003348.

YunQiang Su writes:
<https://salsa.debian.org/gnome-team/gnome-shell/-/merge_requests/71>.
(Note that there is also discussion there of a different failure with the
softpipe renderer, which is out of scope for this bug report.)

I do not intend to work on this myself: I do not have any mips hardware,
any particular interest in mips, or any Mesa or LLVM expertise.

Thanks,
    smcv

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