compiz crashed with SIGSEGV in nir_lower_uniforms_to_ubo() from draw_create_vs_llvm() from draw_create_vertex_shader() from r300_draw_init_vertex_shader() from r300_create_vs_state()

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding compiz. This problem was most recently seen with package version 1:0.9.14.1+20.04.20200211-0ubuntu1, the problem page at https://errors.ubuntu.com/problem/253612f74aa79d2e52b8f27505f04cb72de285c1 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

See also bug 1961858.

[Dash (devel-tootai)]

Hello. No news about this ? Computer being unusable, should I switch back to 18.04 or buy a new computer ?

[Daniel van Vugt (vanvugt)]

It appears this crash has only been reported twice, ever. It's also in an unsupported package (compiz).

If you are using a desktop then I would recommend replacing the graphics card so as to get a different driver. Otherwise please use GNOME (regular Ubuntu).

[Dash (devel-tootai)]

OK, I installed GNOME and now I get lots of

gnome-shell[7645]: segfault at ... ip ... sp ... error 4 in r300_dri.so
Code ...
rfkill: input handler disabled

or

gnome-shell[7481]: segfault at 7f991550bfc2 ip 00007f991550bfc2 sp 00007ffd203cb958 error 14
Code: Unable to access opcode bytes at RIP 0x7f991550bf98.

in dmesg.

[Daniel van Vugt (vanvugt)]

Thanks. That's "good" because it means we can focus on this being just a bug in the Mesa r300 (radeon) driver.

Would you be able to find the details of those gnome-shell crashes? Try these steps: https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment

[Daniel van Vugt (vanvugt)]

It's likely to be one of:

https://errors.ubuntu.com/problem/4e30ea16e95410e86f5271ec0e4b55043abe303c
https://errors.ubuntu.com/problem/23403c3a56e7140750e4d75b24c9c39530cb1473

[Dash (devel-tootai)]

Here is the link

https://errors.ubuntu.com/user/f2b18fbec34694262dfd0c2c67c33716a333a043e2f98df7e75a0e7b73d25ecd383f97915c3ecdcec4a0828ec18ddc4ccd8c73158f61bebf53a61e3e09b75fd9

[Dash (devel-tootai)]

If I could suggest, ubuntu-bug needing a graphical interface, should be good to explain that point 2. is to use if you have only console access.

[Daniel van Vugt (vanvugt)]

Thanks. Your gnome-shell crashes are now being tracked in bug 1964430 and bug 1964429.

Again it looks like a problem in Mesa. Hopefully a newer version of Ubuntu will fix them:

  21.10: https://ubuntu.com/download/desktop
  22.04: http://cdimage.ubuntu.com/daily-live/current/ (pre-release)

[Dash (devel-tootai)]

I tried the 22.04, installation crashed after disk partitioning. I download the 18.04.6 and now everything is back, no more graphical problems, great \o/.

I'll keep this version and blocked the OS version upgrade. Thanks for your support.