The two relevant commits appeared in Mir 0.3.0 and then 0.4.0:
revno: 1725 [merge]
committer: Alan Griffiths
branch nick: development-branch
timestamp: Thu 2014-06-26 17:06:24 +0100
message:
server: Avoid race condition in AlarmImpl
-
** Changed in: mir
Milestone: None => 0.5.0
** Also affects: mir/0.4
Importance: Undecided
Status: New
** Changed in: mir/0.4
Status: New => In Progress
** Changed in: mir/0.4
Importance: Undecided => High
** Changed in: mir/0.4
Assignee: (unassigned) => Alberto Agu
** Branch linked: lp:~mir-team/mir/fix-1339700
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Title:
Device locks randomly on welcome screen
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htt
** Branch linked: lp:~mir-team/mir/fix-1339700-in-0.4
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Title:
Device locks randomly on welcome screen
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** Changed in: mir
Status: Confirmed => In Progress
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Title:
Device locks randomly on welcome screen
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** Changed in: mir
Assignee: (unassigned) => Alberto Aguirre (albaguirre)
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Title:
Device locks randomly on welcome screen
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** Changed in: unity8 (Ubuntu)
Status: Confirmed => Invalid
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Device locks randomly on welcome screen
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Yeah it's a deadlock in mir, specifically between the compositor Thread
and the main loop:
The TimeoutFrameDroppingPolicy has timedout, so it owns the internal
alarm mutex and attemps to drop a frame, so it waits for the BufferQueue
mutex.
The compositor thread is releasing a buffer, so it calls
My trace out of manta: http://paste.ubuntu.com/7772239/
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Device locks randomly on welcome screen
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This is the most I could get out of it: http://paste.ubuntu.com/7772064
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Device locks randomly on welcome screen
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Suspicious things from the above (chicken'n'egg possible):
Thread 33: __invoke
Should only be called occasionally, if this locked up, would suggest something
in app screenshotting?
Thread 31: SessionAuthorizer::requestAuthorizationForSession
This one should usually only be called on session star
More symbols from mzanetti: http://paste.ubuntu.com/7771898/
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Device locks randomly on welcome screen
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This has been happening to me, more importantly though, when a fix does
go in I would like to see an automated test go in along with it.
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** Attachment added: "gdb.txt"
https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1339700/+attachment/4148820/+files/gdb.txt
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Title:
Devic
A bit more info:
- apps can't be launched (hang at startup)
- can't call (display powers up, no sound or notification)
- I couldn't connect from gdb ("A program is being debugged already. Kill it?
(y or n)")
- unity8 consumes some CPU (but not a lot, like 14%)
- SIGTERM didn't help
- SIGSEGV did
I had this today on #119 on mako.
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Device locks randomly on welcome screen
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** Changed in: unity8 (Ubuntu)
Status: New => Confirmed
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Device locks randomly on welcome screen
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