[mythtv-commits] Ticket #6736: strange mythtv segfaults
MythTV
mythtv at cvs.mythtv.org
Sat Jul 18 12:49:10 UTC 2009
#6736: strange mythtv segfaults
-----------------------------------------+----------------------------------
Reporter: markus.doits at googlemail.com | Owner: ijr
Type: defect | Status: new
Priority: major | Milestone: unknown
Component: MythTV - Mythtranscode | Version: head
Severity: medium | Mlocked: 0
-----------------------------------------+----------------------------------
using svn rev 20947.
so first running simply ./configure:
{{{
# Basic Settings
Compile type release
Compiler cache symlink gcc
DistCC no
qmake /usr/bin/qmake-qt4
install prefix /usr/local
runtime prefix /usr/local
CPU x86 x86_64 (model name : Intel(R)
Core(TM)2 Quad CPU Q9300 @ 2.50GHz)
big-endian no
runtime cpu detection no
yasm yes
MMX enabled yes
MMX2 enabled yes
3DNow! enabled yes
3DNow! extended enabled yes
SSE enabled yes
SSSE3 enabled yes
CMOV enabled yes
CMOV is fast yes
# Input Support
Joystick menu yes
lirc support yes
Video4Linux sup. yes
ivtv support yes
HR-PVR support yes
FireWire support yes
DVB support yes [/usr/include]
HDHomeRun support yes
IPTV support yes
# Sound Output Support
PulseAudio support yes
OSS support yes
ALSA support yes
aRts support yes
JACK support yes
libfftw3 support no
# Video Output Support
x11 support yes
xrandr support yes
xv support yes
XvMC support yes
XvMC VLD support yes
XvMC pro support no
XvMC libs -lXvMCW
VDPAU support yes
OpenGL video yes
OpenGL vsync yes
DirectFB yes
Fribidi formatting no
MHEG support yes
# Misc Features
multi threaded libavcodec yes
Frontend yes
Backend yes
# Bindings
bindings_perl yes
bindings_python yes
}}}
it builds fine. but here, using mythtranscode gives the following (i
removed various "no debugging symbols found"-lines):
{{{
(gdb) run -i 1014_20090718134400.mpg -o /tmp/bla -p autodetect
--showprogress
(no debugging symbols found)
Starting program: /usr/local/bin/mythtranscode -i 1014_20090718134400.mpg
-o /tmp/bla -p autodetect --showprogress
(no debugging symbols found)
...
009-07-18 14:19:05.855 Using runtime prefix = /usr/local
2009-07-18 14:19:05.855 Empty LocalHostName.
[New Thread 0x7febfa056950 (LWP 9340)]
[Thread 0x7febfa056950 (LWP 9340) exited]
2009-07-18 14:19:05.881 New DB connection, total: 1
2009-07-18 14:19:05.884 Closing DB connection named 'DBManager0'
2009-07-18 14:19:05.884 Enabled verbose msgs: important
2009-07-18 14:19:05.886 New DB connection, total: 2
2009-07-18 14:19:05.891 New DB connection, total: 3
2009-07-18 14:19:06.531 Using protocol version 45
[New Thread 0x7febfa056950 (LWP 9341)]
[New Thread 0x7febf7824950 (LWP 9342)]
[New Thread 0x7febf7023950 (LWP 9343)]
[New Thread 0x7febf6822950 (LWP 9344)]
[New Thread 0x7febf6019950 (LWP 9345)]
2009-07-18 14:19:06.704 Transcode: Looking for autodetect profile:
Autodetect from 576i
2009-07-18 14:19:06.719 Transcode: Using autodetect profile: MPEG2
[New Thread 0x7febf5607950 (LWP 9346)]
[New Thread 0x7febf4dfe950 (LWP 9347)]
strange error flushing buffer ...
2009-07-18 14:19:06.780 mythtranscode: 0% Completed @ 0 fps.
2009-07-18 14:19:10.902 Processed: 219 of 1925 frames(8 seconds)
2009-07-18 14:19:15.904 Processed: 513 of 1925 frames(20 seconds)
2009-07-18 14:19:20.914 Processed: 832 of 1925 frames(33 seconds)
2009-07-18 14:19:25.915 Processed: 1143 of 1925 frames(45 seconds)
2009-07-18 14:19:26.789 mythtranscode: 62% Completed @ 60.004 fps.
2009-07-18 14:19:30.916 Processed: 1461 of 1925 frames(58 seconds)
2009-07-18 14:19:35.933 Processed: 1793 of 1925 frames(71 seconds)
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fec0afd77a0 (LWP 9339)]
0x00007fec08ef6b90 in sws_freeContext () from
/usr/local/lib/libmythswscale-0.22.so.0
(gdb) bt
#0 0x00007fec08ef6b90 in sws_freeContext () from
/usr/local/lib/libmythswscale-0.22.so.0
#1 0x00000000004204cd in ?? ()
#2 0x0000000000414e61 in ?? ()
#3 0x00007fec027425a6 in __libc_start_main () from /lib/libc.so.6
#4 0x0000000000409949 in ?? ()
#5 0x00007fff65dda098 in ?? ()
#6 0x000000000000001c in ?? ()
#7 0x0000000000000008 in ?? ()
#8 0x00007fff65ddb073 in ?? ()
#9 0x00007fff65ddb090 in ?? ()
#10 0x00007fff65ddb093 in ?? ()
#11 0x00007fff65ddb0ab in ?? ()
#12 0x00007fff65ddb0ae in ?? ()
#13 0x00007fff65ddb0b7 in ?? ()
#14 0x00007fff65ddb0ba in ?? ()
#15 0x00007fff65ddb0c5 in ?? ()
#16 0x0000000000000000 in ?? ()
}}}
okey, so now i want to debug it, therefore: ./configure --compile-
type=debug
builds fine, but now see mythtranscode (nothing removed from output):
{{{
(gdb) run -i 1014_20090718134400.mpg -o /tmp/bla -p autodetect
--showprogress
The program being debugged has been started already.
Start it from the beginning? (y or n) y
`/usr/local/bin/mythtranscode' has changed; re-reading symbols.
Starting program: /usr/local/bin/mythtranscode -i 1014_20090718134400.mpg
-o /tmp/bla -p autodetect --showprogress
[Thread debugging using libthread_db enabled]
[New Thread 0x7f936cbed7a0 (LWP 18012)]
2009-07-18 14:27:49.013 Using runtime prefix = /usr/local
2009-07-18 14:27:49.013 Empty LocalHostName.
[New Thread 0x7f935b969950 (LWP 18013)]
[Thread 0x7f935b969950 (LWP 18013) exited]
2009-07-18 14:27:49.041 New DB connection, total: 1
2009-07-18 14:27:49.044 Closing DB connection named 'DBManager0'
2009-07-18 14:27:49.044 Enabled verbose msgs: important
2009-07-18 14:27:49.046 New DB connection, total: 2
2009-07-18 14:27:49.047 New DB connection, total: 3
2009-07-18 14:27:49.136 Using protocol version 45
[New Thread 0x7f935b969950 (LWP 18014)]
[New Thread 0x7f9359137950 (LWP 18015)]
[New Thread 0x7f9358936950 (LWP 18016)]
[New Thread 0x7f9358135950 (LWP 18017)]
[New Thread 0x7f935792c950 (LWP 18018)]
2009-07-18 14:27:49.349 Transcode: Looking for autodetect profile:
Autodetect from 576i
2009-07-18 14:27:49.376 Transcode: Using autodetect profile: MPEG2
[New Thread 0x7f9356f1a950 (LWP 18019)]
[New Thread 0x7f9356711950 (LWP 18020)]
strange error flushing buffer ...
2009-07-18 14:27:49.449 mythtranscode: 0% Completed @ 0 fps.
2009-07-18 14:27:54.065 Processed: 247 of 1925 frames(9 seconds)
2009-07-18 14:27:59.071 Processed: 548 of 1925 frames(21 seconds)
2009-07-18 14:28:04.075 Processed: 873 of 1925 frames(34 seconds)
2009-07-18 14:28:09.081 Processed: 1185 of 1925 frames(47 seconds)
2009-07-18 14:28:09.462 mythtranscode: 62% Completed @ 60.2794 fps.
2009-07-18 14:28:14.090 Processed: 1491 of 1925 frames(59 seconds)
2009-07-18 14:28:19.106 Processed: 1814 of 1925 frames(72 seconds)
[Thread 0x7f935792c950 (LWP 18018) exited]
[Thread 0x7f9358135950 (LWP 18017) exited]
[Thread 0x7f9359137950 (LWP 18015) exited]
[Thread 0x7f9358936950 (LWP 18016) exited]
[Thread 0x7f935b969950 (LWP 18014) exited]
Program exited normally.
}}}
looks fine. so enabling debug mode seems to fix mythtranscode segfault.
but the problem remains running mythtranscode from within mythtv, e.g.
mythweb. i click on "transcode" at the recording and logs say:
{{{
0 15126 transcode 5 0 2009-07-18 14:30:41
eltarun Transcode Errored Sportschau live "DTM Qualifying /
Formel 3 Euroserie": Autodetect (exit status 0, job status was "Running")
1 15125 transcode 5 0 2009-07-18 14:30:09
eltarun Transcode Starting Sportschau live "DTM Qualifying /
Formel 3 Euroserie": Autodetect (47.6 MB)
}}}
and "dmesg" shows:
{{{
[ 6729.185090] mythtranscode[18311] general protection ip:7f967becdc05
sp:7fff028ea340 error:0 in libc-2.9.so[7f967be5a000+149000]
}}}
switching back now to compile-type=release and trying to transcode from
within mythttv gives dmesg-output:
{{{
[ 7064.605586] mythtranscode[26766]: segfault at 883 ip 00007f1fb1672b90
sp 00007fff2544b750 error 4 in
libmythswscale-0.22.so.0.22.0[7f1fb1650000+3b000]
}}}
but this doesn't come up when using gdb.
after clicking around trying to transcode various other recordings i now
also got (compile-type=release)
{{{
[ 7524.682222] mythtranscode[3725] general protection ip:7ff7cdb3f344
sp:7fff6e1b9d50 error:0 in libmythavutil-0.22.so.0.22.0[7ff7cdb38000+c000]
}}}
what's going on? is my system (debian squeeze/sid) broken or mythtv? how
can i debug this further?
thanks for your help
--
Ticket URL: <http://svn.mythtv.org/trac/ticket/6736>
MythTV <http://www.mythtv.org/>
MythTV
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