Per comment #17 it might actually be easiest to build a workaround in
Mir for now... Either disable secondary compositor threads, or build a
SingleThreadedCompositor to replace MultiThreadedCompositor.
In my spare time I'm working on an idea where post() could be made non-
blocking. So that would eliminate the need for Mir's compositor to be
threaded, and nouveau should then work (as well as it ever did for X).
** Changed in: mir
Status: Invalid => Confirmed
** Changed in: mir
Importance: Undecided => Medium
** Tags added: multimonitor
** Changed in: qtmir (Ubuntu)
Importance: Critical => Medium
** Changed in: qtmir (Ubuntu)
Status: Incomplete => Confirmed
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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1553328
Title:
Mir/Unity8/USC crashes/freezes on nouveau (nv50) in pushbuf_kref()
especially with multiple monitors, webbrowser-app or system settings
Status in Canonical System Image:
Incomplete
Status in Mir:
Confirmed
Status in Nouveau Xorg driver:
Unknown
Status in libdrm package in Ubuntu:
Triaged
Status in mesa package in Ubuntu:
Invalid
Status in mir package in Ubuntu:
Invalid
Status in qtmir package in Ubuntu:
Confirmed
Bug description:
Unit8 froze up while I was trying to open system settings.
ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: unity8 8.11+16.04.20160216.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-9.24-generic 4.4.3
Uname: Linux 4.4.0-9-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Date: Fri Mar 4 19:12:54 2016
ExecutablePath: /usr/bin/unity8
InstallationDate: Installed on 2015-05-10 (299 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcCmdline: unity8
SegvAnalysis:
Segfault happened at: 0x7f58d568706c: mov 0x8(%rsi),%edx
PC (0x7f58d568706c) ok
source "0x8(%rsi)" (0x00000008) not located in a known VMA region (needed
readable region)!
destination "%edx" ok
Stack memory exhausted (SP below stack segment)
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity8
StacktraceTop:
?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
?? () from /usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
?? () from /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
?? () from /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1
Title: unity8 crashed with SIGSEGV
UpgradeStatus: Upgraded to xenial on 2015-11-07 (118 days ago)
UserGroups: adm autopilot cdrom dip lpadmin plugdev sambashare sudo
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