The nouveau isn't threadsafe and the Qt renderer uses threaded GL by
default.
We don't know if Mir's default renderer would also exhibit the same
issue when running multimonitor. (The Mir renderer uses a thread per
monitor, but this is a simpler usage pattern than Qt and may not
manifest problems.)
** Changed in: mir
Status: Triaged => Incomplete
** Changed in: mir
Importance: High => Undecided
** Changed in: mir (Ubuntu)
Status: Triaged => Incomplete
** Changed in: mir (Ubuntu)
Importance: High => Undecided
** Changed in: canonical-devices-system-image
Assignee: Stephen M. Webb (bregma) => (unassigned)
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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:
Triaged
Status in Mir:
Incomplete
Status in Nouveau Xorg driver:
Unknown
Status in Unity System Compositor:
Triaged
Status in libdrm package in Ubuntu:
Triaged
Status in mesa package in Ubuntu:
Invalid
Status in mir package in Ubuntu:
Incomplete
Status in qtmir package in Ubuntu:
In Progress
Status in qtubuntu package in Ubuntu:
In Progress
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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