Opened 11 years ago
Closed 11 years ago
#6736 closed defect (fixed)
strange mythtv segfaults
| Reported by: | Owned by: | Janne Grunau | |
|---|---|---|---|
| Priority: | major | Milestone: | unknown |
| Component: | MythTV - Mythtranscode | Version: | head |
| Severity: | medium | Keywords: | |
| Cc: | Ticket locked: | no |
Description
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
Attachments (1)
Change History (10)
comment:1 Changed 11 years ago by
| Status: | new → infoneeded_new |
|---|
comment:2 Changed 11 years ago by
all right, here it comes (looks like good debug-output now):
(gdb) run
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 0x7f5bd29617a0 (LWP 16825)]
2009-07-18 15:54:26.679 Using runtime prefix = /usr/local
2009-07-18 15:54:26.679 Empty LocalHostName.
[New Thread 0x7f5bc1999950 (LWP 16826)]
[Thread 0x7f5bc1999950 (LWP 16826) exited]
2009-07-18 15:54:26.724 New DB connection, total: 1
2009-07-18 15:54:26.732 Closing DB connection named 'DBManager0'
2009-07-18 15:54:26.732 Enabled verbose msgs: important
2009-07-18 15:54:26.734 New DB connection, total: 2
2009-07-18 15:54:26.735 New DB connection, total: 3
2009-07-18 15:54:26.832 Using protocol version 45
[New Thread 0x7f5bc1999950 (LWP 16827)]
[New Thread 0x7f5bbf167950 (LWP 16828)]
[New Thread 0x7f5bbe966950 (LWP 16829)]
[New Thread 0x7f5bbe165950 (LWP 16830)]
[New Thread 0x7f5bbd964950 (LWP 16831)]
2009-07-18 15:54:26.986 Transcode: Looking for autodetect profile: Autodetect from 576i
2009-07-18 15:54:27.004 Transcode: Using autodetect profile: MPEG2
[New Thread 0x7f5bbcf52950 (LWP 16832)]
[New Thread 0x7f5bbc749950 (LWP 16833)]
strange error flushing buffer ...
2009-07-18 15:54:27.068 mythtranscode: 0% Completed @ 0 fps.
2009-07-18 15:54:31.760 Processed: 242 of 1925 frames(9 seconds)
2009-07-18 15:54:36.773 Processed: 527 of 1925 frames(21 seconds)
2009-07-18 15:54:41.786 Processed: 836 of 1925 frames(33 seconds)
2009-07-18 15:54:46.798 Processed: 1139 of 1925 frames(45 seconds)
2009-07-18 15:54:47.074 mythtranscode: 60% Completed @ 57.7576 fps.
2009-07-18 15:54:51.814 Processed: 1436 of 1925 frames(57 seconds)
2009-07-18 15:54:56.829 Processed: 1754 of 1925 frames(70 seconds)
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f5bd29617a0 (LWP 16825)]
0x00007f5bd084fb90 in sws_freeContext () from /usr/local/lib/libmythswscale-0.22.so.0
Current language: auto; currently asm
(gdb) bt
#0 0x00007f5bd084fb90 in sws_freeContext () from /usr/local/lib/libmythswscale-0.22.so.0
#1 0x000000000042096f in Transcode::TranscodeFile (this=0x156ea30, inputname=<value optimized out>, outputname=<value optimized out>,
profileName=<value optimized out>, honorCutList=<value optimized out>, framecontrol=<value optimized out>, jobID=-1, fifodir=
{static null = {<No data fields>}, static shared_null = {ref = {_q_value = 315}, alloc = 0, size = 0, data = 0x6594da, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 156}, alloc = 0, size = 0, data = 0x7f5bcafb1ada, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x6594c0, static codecForCStrings = 0x0},
deleteMap={{d = 0x6594e0, e = 0x6594e0}}) at transcode.cpp:1162
#2 0x00000000004152cd in main (argc=8, argv=<value optimized out>) at main.cpp:591
comment:3 Changed 11 years ago by
Please follow the instructions at: http://www.mythtv.org/docs/mythtv-HOWTO-22.html#ss22.2
to get a full backtrace.
comment:4 Changed 11 years ago by
okey, attached. it's build-type=profile though, since debug does not get the segfault.
comment:5 Changed 11 years ago by
Looks like a simple case of an uninitialized variable. Change line 808 of transcode.cpp from:
struct SwsContext *scontext;
to
struct SwsContext *scontext = NULL;
comment:7 Changed 11 years ago by
| Status: | infoneeded_new → new |
|---|
comment:8 Changed 11 years ago by
| Owner: | changed from Isaac Richards to Janne Grunau |
|---|---|
| Status: | new → accepted |
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Can you please try a profile build and then get a backtrace?