[radeon] Chrome crashes in RADV 21.2.6 on Ubuntu 20.04.6

[Shahbaz Youssefi]

Hi, Chrome/ANGLE developer here.

We've started observing crashes on Ubuntu 20.04.6 in libvulkan_radeon.so since December 5, 2023. So far, all crashes seem to come from that specific Ubuntu version, and with RADV 21.2.6. Speaking with a mesa RADV developer, that version hasn't had an update since Nov 2021.

While there's always a chance that an update in ANGLE has hit a bug, the timing does not work out (Chrome Beta has been fine since November 1, but the crashes started happening on Dec 5).

Has there been an update to this driver around Dec 5, 2023 in Ubuntu specifically? I'm wondering if there has been a (security) update done by the Ubuntu team that upstream mesa may not be aware of. I can't find a public history of updates to ubuntu packages (with associated dates), is it possible to look at / provide that info and see what happened around Dec 5?

Additional context is crbug.com/1508940, but I'm afraid not much is visible publicly. The crash stack is nonsense unfortunately.

Cheers

[Timo Aaltonen (tjaalton)]

it might've been a kernel update that triggers it, mesa hasn't changed.

[Shahbaz Youssefi (shabbyx)]

I see the crash happening on the following kernels, so that seems unlikely:

5.15.0 -89-generic #99~20.04.1-Ubuntu SMP Thu Nov 2 15:16:47 UTC 2023 x86_64 38.41%
5.15.0 -91-generic #101~20.04.1-Ubuntu SMP Thu Nov 16 14:22:28 UTC 2023 x86_64 21.38%
5.11.0 -37-generic #41~20.04.2-Ubuntu SMP Fri Sep 24 09:06:38 UTC 2021 x86_64 10.51%
5.13.0 -30-generic #33~20.04.1-Ubuntu SMP Mon Feb 7 14:25:10 UTC 2022 x86_64 7.25%
5.15.0 -46-lowlatency #49~20.04.1-Ubuntu SMP PREEMPT Mon Aug 8 11:51:19 UTC 2022 x86_64 5.43%
5.15.0 -76-generic #83~20.04.1-Ubuntu SMP Wed Jun 21 20:23:31 UTC 2023 x86_64 5.07%
5.15.0 -88-generic #98~20.04.1-Ubuntu SMP Mon Oct 9 16:43:45 UTC 2023 x86_64 3.26%
5.14.21 -150500 #1 SMP PREEMPT_DYNAMIC Wed Oct 4 16:52:05 UTC 2023 (5dc23e0) x86_64 2.17%
...

But thank you for the info, at least we can rule out a change in mesa having broken things. We can perhaps close this bug then, at least until I can investigate further what the root cause is.

If any RADV user is reading this and has a repro step, please comment on http://crbug.com/1508940