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Avidemux Forum

Avidemux => Main version 2.6 => Topic started by: Jan Gruuthuse on June 19, 2015, 07:29:53 AM

Title: sometimes avidemux 2.6.10 freezes while saving video
Post by: Jan Gruuthuse on June 19, 2015, 07:29:53 AM
have a gdb session of it, see attachment
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Avidemux v2.6.10 (329d81e)
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Compiler: GCC 4.8.4
cmake: 2.8.12.2
Build Target: Linux (x86-64)
User Interface: Qt (4.8.6)
_____________________________________________
Kernel: Linux 3.13.0-55-generic (x86_64) (linux-image-3.13.0-55-generic   3.13.0-55.92)
Distribution: Linux Ubuntu 14.04.2 LTS (Trusty)

Intel Core i7-3770K @ 3.50GHz (4 Cores/8 Threads) with 32 GB ram

Desktop: Unity 7.2.5
Display Server: X Server 1.15.1
Display Driver: NVIDIA 349.16
OpenGL: 4.3.0


OpenGL Vendor: NVIDIA Corporation
OpenGL Renderer: GeForce GTX 960/PCIe/SSE2 2048MB (1227/3600MHz)
OpenGL: 4.5.0 NVIDIA 349.16


vdpauinfo:
---------
API version: 1
NVIDIA VDPAU Driver Shared Library  349.16
_____________________________________________
Title: Re: sometimes avidemux 2.6.10 freezes while saving video
Post by: ajschult on June 19, 2015, 12:13:54 PM
If you want useful info from gdb, you'll need to at least get a backtrace

Code Select

(gdb) bt


You might also grab backtraces for all threads

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(gdb) thread apply all backtrace
(gdb) bt
Title: Re: sometimes avidemux 2.6.10 freezes while saving video
Post by: Jan Gruuthuse on June 19, 2015, 04:52:46 PM
Code Select
gdb avidemux3_qt4 2>&1 | tee ~/gdb-avidemux3_qt4.txt
Quote(gdb) handle SIG33 pass nostop noprint
(gdb) set pagination 0
(gdb) thread apply all backtrace
(gdb) run
(gdb) bt
was this the correct order?
Title: Re: sometimes avidemux 2.6.10 freezes while saving video
Post by: mean on June 20, 2015, 07:15:02 AM
that one is a crash due to detecting memory corruption
Title: Re: sometimes avidemux 2.6.10 freezes while saving video
Post by: Jan Gruuthuse on June 20, 2015, 07:20:06 AM
So this could be anything (driver conflict, software layer issues OS <> desktop <> QT4 , ....)
wrong configuration, perhaps hardware issue.
No way to find out exactly?
Title: Re: sometimes avidemux 2.6.10 freezes while saving video
Post by: Jan Gruuthuse on June 20, 2015, 09:46:01 AM
vdpau related: Decode or Display. When on xvideo and no HW Accel, avidemux 2.6.10 works fine.
Title: Re: sometimes avidemux 2.6.10 freezes while saving video
Post by: ajschult on June 20, 2015, 06:17:26 PM
It's pretty deep into UI code (avidemux, qt, glib) when it crashes.  It will probably be difficult to track down, but you might be able to get more information from valgrind.

valgrind avidemux3_qt4

or

valgrind --log-file=valgrind.log avidemux3_qt4

avidemux (and everything else) runs super-slow under valgrind, so you really want a way to quickly trigger the crash.
Title: Re: sometimes avidemux 2.6.10 freezes while saving video
Post by: Jan Gruuthuse on June 21, 2015, 06:43:58 AM
I can not reproduce the issue while running:
Code Select
valgrind --log-file=valgrind.log avidemux3_qt4

If it helps i was able to reproduce the issue while running strace:
Code Select
strace /usr/bin/avidemux3_qt4
Download 447 kB StraceAvidemuxTerminalOutput (https://www.dropbox.com/s/twxu4qgk3kgg4by/StraceAvidemuxTerminalOutput.txt.zip?dl=0)
Title: Re: sometimes avidemux 2.6.10 freezes while saving video
Post by: Jan Gruuthuse on June 21, 2015, 10:08:25 AM
Code Select
valgrind --tool=helgrind --log-file=valgrind.log avidemx3_qt4
was able to produce a log while avidemux halted.
- several lock order "0x... before 0x..." violated showing
- Possible data race during write of size 8
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