nouveau fb: trapped write at X on channel Y; fifo CACHE_ERROR

[TJ]

Occurred whilst using Firefox Nightly 59.0a1 (2017-11-22) - session had been active for several days. No crash report or other useful info in other logs than shown here.

Firefox stopped responding then I realised the entire desktop had likewise although touchpad/mouse movement was fine. Keyboard input was also unavailable (including Ctrl+Alt+Fx).

SSHed in and after seeing the entries in kern.log did "pkill firefox" upon which full control was regained.

This is on 16.04 amd64 with linux-lowlatency-hwe-16.04-edge

lspci -nn
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G84M [GeForce 8600M GT] [10de:0407] (rev a1)

lsb_release -a

LSB Version: core-9.20160110ubuntu0.2-amd64:core-9.20160110ubuntu0.2-noarch:security-9.20160110ubuntu0.2-amd64:security-9.20160110ubuntu0.2-noarch
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial

uname -a
4.13.0-17-lowlatency #20~16.04.1-Ubuntu SMP PREEMPT Mon Nov 6 15:10:44 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Extract from /var/log/kern.log
Dec 1 20:53:31 hephaestion kernel: [776251.301376] nouveau 0000:01:00.0: fb: trapped write at 0020012054 on channel 5 [0f7c8000 firefox[14820]] engine 05 [PFIFO] client 08 [PFIFO_READ] subclient 01 [SEMAPHORE]
reason 00000006 [NULL_DMAOBJ]
Dec 1 20:53:31 hephaestion kernel: [776251.306835] nouveau 0000:01:00.0: fb: trapped read at 0020012050 on channel 5 [0f7c8000 firefox[14820]] engine 05 [PFIFO] client 08 [PFIFO_READ] subclient 01 [SEMAPHORE] r
eason 00000006 [NULL_DMAOBJ]
Dec 1 20:53:31 hephaestion kernel: [776251.306865] nouveau 0000:01:00.0: fifo: CACHE_ERROR - ch 5 [firefox[14820]] subc 2 mthd 0230 data 000000cf
Dec 1 20:53:31 hephaestion kernel: [776251.306897] nouveau 0000:01:00.0: fifo: CACHE_ERROR - ch 5 [firefox[14820]] subc 2 mthd 0234 data 00000000
Dec 1 20:53:31 hephaestion kernel: [776251.306927] nouveau 0000:01:00.0: fifo: CACHE_ERROR - ch 5 [firefox[14820]] subc 2 mthd 0238 data 00000040
Dec 1 20:53:31 hephaestion kernel: [776251.306961] nouveau 0000:01:00.0: fifo: CACHE_ERROR - ch 5 [firefox[14820]] subc 2 mthd 023c data 00000001
...
Dec 1 21:02:53 hephaestion kernel: [776813.709207] nouveau 0000:01:00.0: gr: DATA_ERROR 00000023 [XY_OUT_OF_BOUNDS]
Dec 1 21:02:53 hephaestion kernel: [776813.709215] nouveau 0000:01:00.0: gr: 00100000 [] ch 5 [000f7c8000 firefox[14820]] subc 5 class 5039 mthd 0328 data 00000000
Dec 1 21:02:53 hephaestion kernel: [776813.709232] nouveau 0000:01:00.0: fb: trapped read at 002001a050 on channel 5 [0f7c8000 firefox[14820]] engine 0c [SEMAPHORE_BG] client 08 [PFIFO_READ] subclient 00 [] reason 00000002 [PAGE_NOT_PRESENT]
Dec 1 21:02:53 hephaestion kernel: [776813.739326] Chrome_~dThread[19418]: segfault at 0 ip 00007fe6bee4d7c0 sp 00007fe6bd372b10 error 6 in libxul.so[7fe6beb9b000+4778000]
Dec 1 21:02:53 hephaestion kernel: [776813.739553] Chrome_~dThread[8961]: segfault at 0 ip 00007fead3b4d7c0 sp 00007fead2072b10 error 6 in libxul.so[7fead389b000+4778000]
Dec 1 21:02:53 hephaestion kernel: [776813.739734] Chrome_~dThread[16471]: segfault at 0 ip 00007f6cd444d7c0 sp 00007f6cd2972b10 error 6 in libxul.so[7f6cd419b000+4778000]
Dec 1 21:02:53 hephaestion kernel: [776813.739915] Chrome_~dThread[15142]: segfault at 0 ip 00007f714354d7c0 sp 00007f7141a72b10 error 6 in libxul.so[7f714329b000+4778000]
Dec 1 21:02:53 hephaestion kernel: [776813.740441] Chrome_~dThread[30269]: segfault at 0 ip 00007f38a2f4d7c0 sp 00007f38a1472b10 error 6 in libxul.so[7f38a2c9b000+4778000]

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1735842

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.