Created attachment 138227 [details] Standalone HTML file for reproduction The repetitive updating + rendering of a fragment shader leads to a crash of the nouveau driver. Reproduction steps: - OS: Linux 4.13.0-37-generic #42~16.04.1-Ubuntu SMP Wed Mar 7 16:03:28 UTC 2018 x86_64 - Mesa 17.3.3 (from ppa:ubuntu-x-swat) - GPU: NVIDIA Corporation GK107 [GeForce GT 630 OEM] (rev a1) Using chromium (64.0.3282.167, firefox does not reproduce), visit the html page attached to that bug report, and wait for approx. 30 times of shader update. Nouveau crashes with error: nouveau: kernel rejected pushbuf: No such file or directory nouveau: ch7: krec 0 pushes 1 bufs 24 relocs 0 nouveau: ch7: buf 00000000 00000004 00000004 00000004 00000000 nouveau: ch7: buf 00000001 00000006 00000004 00000000 00000004 nouveau: ch7: buf 00000002 00000008 00000002 00000002 00000002 ... See attachment for the whole error trace. Reproduction is non-deterministic as the number of time to render the shader may vary, but it does crash reliably within the first 50 shader updates (sometimes less than 20 updates are enough) on my setup.
Created attachment 138228 [details] Trace of nouveau crash from Chromium output
What's in dmesg when this happens?
This is the two lines of dmesg related to such a crash: [ 1524.609065] show_signal_msg: 13 callbacks suppressed [ 1524.609067] chromium-browse[2200]: segfault at 840 ip 00007f66b4a7032c sp 00007ffe7e040960 error 6 in libdrm_nouveau.so.2.0.0[7f66b4a6c000+7000]
The long print is a result of an ioctl failure. The kernel will usually print more information about why the submit ioctl fails in dmesg. What you provided was the fact that there's a segfault somewhere down the line... ioctl failures are very poorly handled by the nouveau 3d driver, so I'm not terribly surprised.
Created attachment 138308 [details] Longer dmesg log showing chrome errors Add a new attachment: longer dmesg trace which shows many duplicate of this Chrome error just before reporting the segfault in nouveau: [ 5188.843931] nouveau 0000:01:00.0: chromium-browse[8083]: Unknown handle 0x00000000 [ 5188.843935] nouveau 0000:01:00.0: chromium-browse[8083]: validate_init [ 5188.843936] nouveau 0000:01:00.0: chromium-browse[8083]: validate: -2 [... the above repeated many times ...] [ 5195.280913] chromium-browse[8083]: segfault at 4b0 ip 00007f9620a5fd73 sp 00007fffb5af7bc0 error 4 in libdrm_nouveau.so.2.0.0[7f9620a5d000+7000] Given that I cannot reproduce on Firefox, could it be the case that it is a Chrome issue?
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