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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Nouveau fills kern.log with gigabytes of data when molecule screensaver is ran"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91373">91373</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Nouveau fills kern.log with gigabytes of data when molecule screensaver is ran
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/nouveau
</td>
</tr>
<tr>
<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vhann3000+freedesktop@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
</tr></table>
<p>
<div>
<pre>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
<a href="https://bugs.launchpad.net/ubuntu/+source/linux-lts-vivid/+bug/1474538">https://bugs.launchpad.net/ubuntu/+source/linux-lts-vivid/+bug/1474538</a></pre>
</div>
</p>
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