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[Bug 1474538] Re: nouveau driver fills syslog when running xscreensaver (molecule)

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From: Bug Watch Updater <1474538@xxxxxxxxxxxxxxxxxx>
Date: Thu, 30 Jul 2015 22:20:01 -0000
Reply-to: Bug 1474538 <1474538@xxxxxxxxxxxxxxxxxx>
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------------------------------------------------------------------------
On 2015-07-17T14:46:08+00:00 Vhann3000+freedesktop wrote:

On Ubuntu 14.04.2, with both the stock kernel and 3.19.0-22, nouveau
fills kern.log with messages like these:

====================8< CUT HERE 8<=================================================================
$ tail -n 3000 kern.log.1 | head -n 50
Jul 10 18:02:35 dioo-XPS kernel: [114893.357149] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.406261] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.406269] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.420442] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.420447] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.479210] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.479217] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.568349] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.568356] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.622806] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.622813] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.637217] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.637221] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.695836] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.695843] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.784309] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.784316] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.838180] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.838187] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.853754] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.853759] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.913521] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.913528] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114893.977242] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114893.977249] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114894.068780] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114894.068788] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114894.122599] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114894.122606] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114894.137025] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114894.137030] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:35 dioo-XPS kernel: [114894.195675] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:35 dioo-XPS kernel: [114894.195682] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.284069] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.284078] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.339830] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.339837] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.353411] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.353416] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.412188] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.412204] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.501906] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.501913] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.558826] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.558831] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.570001] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.570006] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.628831] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
Jul 10 18:02:36 dioo-XPS kernel: [114894.628839] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
Jul 10 18:02:36 dioo-XPS kernel: [114894.717193] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: LBREQ
====================8< CUT HERE 8<==================================================================

On Kernel 4.2.0-rc2 (compiled based on the stock kernel's config), the
computer just locks up:

I xscreensaver-command -lock, then logged back in (no issue there), then
I xscreensaver-command -lock again and the computer just locked up. Caps
lock light was unresponsive on the keyboard, Ctrl+Alt+Delete didn't
work, RESIUB magic keys either.

After hard rebooting the computer, here is what what in kern.log and
syslog:

Jul 16 17:19:45 dioo-XPS rtkit-daemon[2678]: Supervising 4 threads of 1 processes of 1 users.
Jul 16 17:27:15 dioo-XPS kernel: [ 619.825758] nouveau E[ PFIFO][0000:01:00.0] SCHED_ERROR [ CTXSW_TIMEOUT ]
Jul 16 17:27:15 dioo-XPS kernel: [ 619.825764] nouveau E[ PFIFO][0000:01:00.0] PGRAPH engine fault on channel 2, recovering...
Jul 16 17:28:35 dioo-XPS dbus[894]: [system] Activating service name='org.freedesktop.systemd1' (using servicehelper)

The downstream bug is https://bugs.launchpad.net/ubuntu/+source/linux-
lts-vivid/+bug/1474538

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/4

------------------------------------------------------------------------
On 2015-07-17T14:54:34+00:00 Vhann3000+freedesktop wrote:

Looks much better on v3.19.

The computer didn't lock up after 3 xscreensaver-command -lock.

Interestingly though, on the HDMI screen, the first time, the molecule
wasn't rotating and error messages appeared. This was in dmesg:

[  131.177645] nouveau E[   PFIFO][0000:01:00.0] SCHED_ERROR [ CTXSW_TIMEOUT ]
[  131.177651] nouveau E[   PFIFO][0000:01:00.0] PGRAPH engine fault on channel 7, recovering...
[  160.403618] nouveau E[molecule[2408]] failed to idle channel 0xcccc0000 [molecule[2408]]
[  175.398186] nouveau E[molecule[2408]] failed to idle channel 0xcccc0000 [molecule[2408]]

Didn't get any error since, still testing.

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/6

------------------------------------------------------------------------
On 2015-07-17T16:27:04+00:00 Vhann3000+freedesktop wrote:

v3.19 is no go.

============8< CUT HERE 8<======================
$ grep 'nouveau' /var/log/syslog | head -n 100
Jul 17 10:48:09 dioo-XPS kernel: [    5.463520] fb: switching to nouveaufb from VESA VGA
Jul 17 10:48:09 dioo-XPS kernel: [    5.465859] nouveau  [  DEVICE][0000:01:00.0] BOOT0  : 0x108060a1
Jul 17 10:48:09 dioo-XPS kernel: [    5.465862] nouveau  [  DEVICE][0000:01:00.0] Chipset: GK208 (NV108)
Jul 17 10:48:09 dioo-XPS kernel: [    5.465863] nouveau  [  DEVICE][0000:01:00.0] Family : NVE0
Jul 17 10:48:09 dioo-XPS kernel: [    5.578886] nouveau  [   VBIOS][0000:01:00.0] using image from PROM
Jul 17 10:48:09 dioo-XPS kernel: [    5.579066] nouveau  [   VBIOS][0000:01:00.0] BIT signature found
Jul 17 10:48:09 dioo-XPS kernel: [    5.579067] nouveau  [   VBIOS][0000:01:00.0] version 80.28.56.00.01
Jul 17 10:48:09 dioo-XPS kernel: [    5.579752] nouveau  [     PMC][0000:01:00.0] MSI interrupts enabled
Jul 17 10:48:09 dioo-XPS kernel: [    5.579792] nouveau  [     PFB][0000:01:00.0] RAM type: DDR3
Jul 17 10:48:09 dioo-XPS kernel: [    5.579793] nouveau  [     PFB][0000:01:00.0] RAM size: 1024 MiB
Jul 17 10:48:09 dioo-XPS kernel: [    5.579794] nouveau  [     PFB][0000:01:00.0]    ZCOMP: 0 tags
Jul 17 10:48:09 dioo-XPS kernel: [    5.581061] nouveau  [    VOLT][0000:01:00.0] GPU voltage: 850000uv
Jul 17 10:48:10 dioo-XPS kernel: [    6.879231] nouveau  [  PTHERM][0000:01:00.0] FAN control: toggle
Jul 17 10:48:10 dioo-XPS kernel: [    6.879242] nouveau  [  PTHERM][0000:01:00.0] fan management: automatic
Jul 17 10:48:10 dioo-XPS kernel: [    6.879280] nouveau  [  PTHERM][0000:01:00.0] internal sensor: yes
Jul 17 10:48:10 dioo-XPS kernel: [    6.879321] nouveau  [     CLK][0000:01:00.0] 07: core 405 MHz memory 810 MHz 
Jul 17 10:48:10 dioo-XPS kernel: [    6.879354] nouveau  [     CLK][0000:01:00.0] 0f: core 967 MHz memory 2002 MHz 
Jul 17 10:48:10 dioo-XPS kernel: [    6.879414] nouveau  [     CLK][0000:01:00.0] --: core 405 MHz memory 810 MHz 
Jul 17 10:48:10 dioo-XPS kernel: [    6.943833] nouveau  [     DRM] VRAM: 1024 MiB
Jul 17 10:48:10 dioo-XPS kernel: [    6.943834] nouveau  [     DRM] GART: 1048576 MiB
Jul 17 10:48:10 dioo-XPS kernel: [    6.943837] nouveau  [     DRM] TMDS table version 2.0
Jul 17 10:48:10 dioo-XPS kernel: [    6.943838] nouveau  [     DRM] DCB version 4.0
Jul 17 10:48:10 dioo-XPS kernel: [    6.943839] nouveau  [     DRM] DCB outp 00: 01000f02 00020030
Jul 17 10:48:10 dioo-XPS kernel: [    6.943840] nouveau  [     DRM] DCB outp 01: 02011f62 00020010
Jul 17 10:48:10 dioo-XPS kernel: [    6.943841] nouveau  [     DRM] DCB outp 02: 02022f10 00000000
Jul 17 10:48:10 dioo-XPS kernel: [    6.943841] nouveau  [     DRM] DCB conn 00: 00001031
Jul 17 10:48:10 dioo-XPS kernel: [    6.943843] nouveau  [     DRM] DCB conn 01: 00002161
Jul 17 10:48:10 dioo-XPS kernel: [    6.943843] nouveau  [     DRM] DCB conn 02: 00000200
Jul 17 10:48:10 dioo-XPS kernel: [    6.949791] nouveau  [     DRM] MM: using COPY for buffer copies
Jul 17 10:48:11 dioo-XPS kernel: [    7.186686] nouveau  [     DRM] allocated 1920x1080 fb: 0x60000, bo ffff8802128c1c00
Jul 17 10:48:11 dioo-XPS kernel: [    7.186814] fbcon: nouveaufb (fb0) is primary device
Jul 17 10:48:11 dioo-XPS kernel: [    7.412257] nouveau 0000:01:00.0: fb0: nouveaufb frame buffer device
Jul 17 10:48:11 dioo-XPS kernel: [    7.412258] nouveau 0000:01:00.0: registered panic notifier
Jul 17 10:48:11 dioo-XPS kernel: [    7.415034] [drm] Initialized nouveau 1.2.2 20120801 for 0000:01:00.0 on minor 0
Jul 17 10:50:16 dioo-XPS kernel: [  131.177645] nouveau E[   PFIFO][0000:01:00.0] SCHED_ERROR [ CTXSW_TIMEOUT ]
Jul 17 10:50:16 dioo-XPS kernel: [  131.177651] nouveau E[   PFIFO][0000:01:00.0] PGRAPH engine fault on channel 7, recovering...
Jul 17 10:50:45 dioo-XPS kernel: [  160.403618] nouveau E[molecule[2408]] failed to idle channel 0xcccc0000 [molecule[2408]]
Jul 17 10:51:00 dioo-XPS kernel: [  175.398186] nouveau E[molecule[2408]] failed to idle channel 0xcccc0000 [molecule[2408]]
Jul 17 11:09:38 dioo-XPS kernel: [ 1293.243951] nouveau E[   PFIFO][0000:01:00.0] SCHED_ERROR [ CTXSW_TIMEOUT ]
Jul 17 11:09:38 dioo-XPS kernel: [ 1293.243957] nouveau E[   PFIFO][0000:01:00.0] PGRAPH engine fault on channel 6, recovering...
Jul 17 11:10:14 dioo-XPS kernel: [ 1328.576624] molecule[2657]: segfault at 38 ip 00007fbb4cdc8770 sp 00007ffd655351b8 error 4 in nouveau_dri.so[7fbb4cabd000+746000]
Jul 17 11:10:14 dioo-XPS kernel: [ 1328.812565] molecule[2658]: segfault at 38 ip 00007f15962d0770 sp 00007ffd1e3a8da8 error 4 in nouveau_dri.so[7f1595fc5000+746000]
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332138] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ACQUIRE
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332145] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[2343]] subc 0 mthd 0x001c data 0x00001004
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332160] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ACQUIRE
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332163] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[2343]] subc 0 mthd 0x001c data 0x00001004
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332176] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ACQUIRE
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332178] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[2343]] subc 0 mthd 0x001c data 0x00001004
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332194] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ACQUIRE
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332196] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[2343]] subc 0 mthd 0x001c data 0x00001004
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332211] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ACQUIRE
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332215] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[2343]] subc 0 mthd 0x001c data 0x00001004
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332234] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ACQUIRE
Jul 17 11:47:01 dioo-XPS kernel: [ 3535.332239] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[2343]] subc 0 mthd 0x001c data 0x00001004
==================8< CUT HERE 8<============================================

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/7

------------------------------------------------------------------------
On 2015-07-17T16:35:20+00:00 Ilia Mirkin wrote:

4.0 received some additional fixes to ctxsw logic. Please try that or
4.1.

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/8

------------------------------------------------------------------------
On 2015-07-20T14:09:27+00:00 Vhann3000+freedesktop wrote:

(In reply to Ilia Mirkin from comment #3)
> 4.0 received some additional fixes to ctxsw logic. Please try that or 4.1.

I compiled v4.1, but actually booted into 4.2.0-rc2 (derp), yet it
didn't crash or write any error to the log files over the whole weekend.

I will keep using it and see if I can still reproduce, but right now,
this appears to work for me.

I can still test v4.1 or v4.0 if you feel it would be useful.

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/9

------------------------------------------------------------------------
On 2015-07-20T16:02:47+00:00 Vhann3000+freedesktop wrote:

4.2 is no go, it just locked up again.

What is interesting is that the keyboard was unresponsive (Caps Lock
light didn't turn on, RESIUB wouldn't work), neither would the ACPI
power off (hitting the power button), yet the computer was still
responsive to the network (apache was still serving Web pages, etc). I
enabled SSH so that I can log in (or try to in any case) to the computer
if it happens again.

I am now testing v4.1.

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/10

------------------------------------------------------------------------
On 2015-07-21T13:53:41+00:00 Vhann3000+freedesktop wrote:

v4.1.0 is no go:

Jul 20 12:55:17 dioo-XPS kernel: [ 3734.622246] usb 1-11: USB disconnect, device number 24
Jul 20 18:20:59 dioo-XPS kernel: [23270.087336] nouveau E[   PFIFO][0000:01:00.0] SCHED_ERROR [ CTXSW_TIMEOUT ]
Jul 20 18:20:59 dioo-XPS kernel: [23270.087341] nouveau E[   PFIFO][0000:01:00.0] PGRAPH engine fault on channel 2, recovering...
Jul 21 08:05:11 dioo-XPS kernel: [72704.336625] audit: type=1400 audit(1437480311.763:67): apparmor="STATUS" operation="profile_replace" name="/usr/lib/cups/backend/cups-pdf" pid=4404 comm="apparmor_parser"

I'll try v4.0 (since I don't have much to lose by doing so), but I'm
guessing there won't be much difference.

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/11

------------------------------------------------------------------------
On 2015-07-21T13:55:59+00:00 Vhann3000+freedesktop wrote:

One thing I did notice that I forgot to mention:

This morning, while the computer was locked up, I tried Ctrl+Alt+Delete,
RESIUB then the ACPI power off and then tried to SSH into the box.

The computer turned off after several minutes which seems to indicate
that the ACPI power off worked, albeit very slowly (and without updating
the screen).

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/12

------------------------------------------------------------------------
On 2015-07-28T14:02:42+00:00 Vhann3000+freedesktop wrote:

For anyone struggling with this bug, I haven't gotten a crash yet with
Ubuntu 14.04's linux-image-3.13.0-58-generic kernel (Ubuntu version
3.13.0-58.97) over the last four days.

Maybe it'll reproduce again, but at the very this kernel version looks
much more stable.

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/13

------------------------------------------------------------------------
On 2015-07-30T19:41:45+00:00 Vhann3000+freedesktop wrote:

After a week's worth of usage on kernel 3.13.0, I'm confident enough to
assert that that kernel version is usable.

Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-lts-
vivid/+bug/1474538/comments/15


** Changed in: nouveau
       Status: Unknown => Confirmed

** Changed in: nouveau
   Importance: Unknown => Medium

-- 
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https://bugs.launchpad.net/bugs/1474538

Title:
  nouveau driver fills syslog when running xscreensaver (molecule)

Status in Nouveau Xorg driver:
  Confirmed
Status in linux-lts-vivid package in Ubuntu:
  New

Bug description:
  nouveau fills /var/log/kern.log and /var/log/syslog with _very_ frequent messages when the molecule xscreensaver is running.
  This is a big problem as it prevents me from letting my machine do anything overnight (with the screenlock on).

  I haven't tested other screensavers and don't appear to get messages
  otherwise. Here is an excerpt:

  ====================8< CUT HERE 8<=================================================================
  $ tail -n 3000 kern.log.1 | head -n 50
  Jul 10 18:02:35 dioo-XPS kernel: [114893.357149] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.406261] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.406269] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.420442] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.420447] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.479210] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.479217] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.568349] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.568356] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.622806] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.622813] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.637217] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.637221] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.695836] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.695843] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.784309] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.784316] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.838180] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.838187] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.853754] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.853759] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.913521] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.913528] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114893.977242] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114893.977249] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114894.068780] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114894.068788] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114894.122599] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114894.122606] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114894.137025] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114894.137030] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:35 dioo-XPS kernel: [114894.195675] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:35 dioo-XPS kernel: [114894.195682] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:36 dioo-XPS kernel: [114894.284069] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:36 dioo-XPS kernel: [114894.284078] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:36 dioo-XPS kernel: [114894.339830] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:36 dioo-XPS kernel: [114894.339837] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:36 dioo-XPS kernel: [114894.353411] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:36 dioo-XPS kernel: [114894.353416] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:36 dioo-XPS kernel: [114894.412188] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:36 dioo-XPS kernel: [114894.412204] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:36 dioo-XPS kernel: [114894.501906] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:36 dioo-XPS kernel: [114894.501913] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:36 dioo-XPS kernel: [114894.558826] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:36 dioo-XPS kernel: [114894.558831] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:36 dioo-XPS kernel: [114894.570001] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:36 dioo-XPS kernel: [114894.570006] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:36 dioo-XPS kernel: [114894.628831] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  Jul 10 18:02:36 dioo-XPS kernel: [114894.628839] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: ch 2 [Xorg[16558]] subc 5 mthd 0x0000 data 0x0000906e
  Jul 10 18:02:36 dioo-XPS kernel: [114894.717193] nouveau E[   PFIFO][0000:01:00.0] PBDMA0: LBREQ
  ====================8< CUT HERE 8<==================================================================

  Both log files are actually 99GiB (they'd be bigger, but at that point
  my / partition was full). Both files contain almost 975M lines each
  (which is quite a lot for a file that gets rotated daily!)

  I run a minimal system (log in to the console, start i3 with startx)
  and I have a keybinding to launch a xscreensaver (specifically the
  molecule screensaver from xscreensaver-gl-extra).

  I had no problem under Ubuntu 15.04 32 bits, but for work-related
  reasons, I had to downgrade to 14.04 (64 bits).

  Both the default kernel (I don't remember which version it was) and
  3.19.0-22 exhibit the problem.

  $ lspci -nn | grep VGA
  01:00.0 VGA compatible controller [0300]: NVIDIA Corporation Device [10de:1286] (rev a1)

  I am not sure if this is relevant, but I have three screens all
  connected to the nVidia card.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-22-generic 3.19.0-22.22~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-22.22~14.04.1-generic 3.19.8-ckt1
  Uname: Linux 3.19.0-22-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  Date: Tue Jul 14 15:31:42 2015
  InstallationDate: Installed on 2015-07-03 (10 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: linux-lts-vivid
  UpgradeStatus: No upgrade log present (probably fresh install)

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