Opened 12 years ago
Closed 12 years ago
#10453 closed Bug Report - Hang/Deadlock (Fixed)
hung backend thread after failed recording?
Reported by: | Owned by: | danielk | |
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Priority: | minor | Milestone: | 0.25 |
Component: | MythTV - General | Version: | Master Head |
Severity: | medium | Keywords: | |
Cc: | Ticket locked: | no |
Description
I'm running v0.25-beta-99-gff73126. Last night a tuner/recording failed such that I got two 376 byte recordings from the same multirec tuner.
The BE log reported:
2012-03-13 21:00:00.988413 E [19135/28408] DVBRead dvbstreamhandler.cpp:215 (RunTS) - DVBSH(/dev/dvb/adapter1/frontend0): Device EOF detected
However still this morning, over 12 hours later the BE still has the tuner of the failed recordings open and the two video files that the 376 byte recordings went to open:
mythbacke 19135 mythtv 98u CHR 212,6 0t0 4963 /dev/dvb/adapter1/frontend0 mythbacke 19135 mythtv 99u unix 0xc2c81000 0t0 801527 socket mythbacke 19135 mythtv 101u unix 0xdfcdc200 0t0 793738 socket mythbacke 19135 mythtv 119u unix 0xf15b8600 0t0 801538 socket mythbacke 19135 mythtv 123u unix 0xeef09200 0t0 783614 socket mythbacke 19135 mythtv 130w REG 252,19 376 11615 /video/mythtv/3129_20120313210000.mpg mythbacke 19135 mythtv 131r FIFO 0,8 0t0 792991 pipe mythbacke 19135 mythtv 132w REG 8,16 376 1026 /storage1/3153_20120313210000.mpg mythbacke 19135 mythtv 133r FIFO 0,8 0t0 792995 pipe
Maybe (probably?) this is a hung thread? Like this one perhaps:
Thread 25 (Thread 0xaeafdb70 (LWP 19159)): #0 0x004ac422 in __kernel_vsyscall () No symbol table info available. #1 0x02a5c834 in pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_timedwait.S:236 No locals. #2 0x021c03e5 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4 No symbol table info available. #3 0x00b62969 in RecorderBase::StopRecording (this=0x9ca9a038) at recorderbase.cpp:179 locker = {val = 2628362361} __FUNCTION__ = "StopRecording" #4 0x00b45b88 in TVRec::TeardownRecorder (this=0x8a9e0a0, request_flags=73728) at tv_rec.cpp:1062 recq = <value optimized out> #5 0x00b4cb38 in TVRec::TuningShutdowns (this=0x8a9e0a0, request=...) at tv_rec.cpp:3524 channum = {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 8537}, alloc = 0, size = 0, data = 0x23f049e, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 31445}, alloc = 0, size = 0, data = 0x23f04b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x23f048c, static codecForCStrings = 0x0} inputname = {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 8537}, alloc = 0, size = 0, data = 0x23f049e, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 31445}, alloc = 0, size = 0, data = 0x23f04b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x23f048c, static codecForCStrings = 0x0} newCardID = 0 __FUNCTION__ = "TuningShutdowns" #6 0x00b532a4 in TVRec::HandleTuning (this=0x8a9e0a0) at tv_rec.cpp:3379 request = {flags = 73728, program = 0x0, channel = {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 8537}, alloc = 0, size = 0, data = 0x23f049e, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 31445}, alloc = 0, size = 0, data = 0x23f04b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x23f048c, static codecForCStrings = 0x0}, input = {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 8537}, alloc = 0, size = 0, data = 0x23f049e, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 31445}, alloc = 0, size = 0, data = 0x23f04b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x23f048c, static codecForCStrings = 0x0}, majorChan = 0, minorChan = 0, progNum = -1} input = {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 8537}, alloc = 0, size = 0, data = 0x23f049e, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 31445}, alloc = 0, size = 0, data = 0x23f04b2, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x23f048c, static codecForCStrings = 0x0} __FUNCTION__ = "HandleTuning" streamData = 0xfffffdfc #7 0x00b5df13 in TVRec::run (this=0x8a9e0a0) at tv_rec.cpp:1246 recEnd = {d = {d = 0x9268318}} lock = {val = 145350953} __FUNCTION__ = "run" #8 0x01969020 in MThread::run (this=0x8a9e210) at mthread.cpp:307 No locals. #9 0x01969f42 in MThreadInternal::run (this=0x8aa09f8) at mthread.cpp:77 No locals. #10 0x021bfda2 in ?? () from /usr/lib/libQtCore.so.4 No symbol table info available. #11 0x02a57e99 in start_thread (arg=0xaeafdb70) at pthread_create.c:304 pd = 0xaeafdb70 unwind_buf = {cancel_jmp_buf = {{jmp_buf = {44466164, 0, 4001536, -1364208584, 1633925250, 1949944794}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = <value optimized out> robust = <value optimized out> pagesize_m1 = <value optimized out> sp = <value optimized out> freesize = <value optimized out> __PRETTY_FUNCTION__ = "start_thread" #12 0x024c29ee in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130 No locals.
Full threaded stacktrace will be attached.
FWIW, this is my BE's state while I am seeing the symptoms in ticket #10451.
Attachments (1)
Change History (4)
Changed 12 years ago by
Attachment: | ThreadStacktrace.txt added |
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comment:1 Changed 12 years ago by
Owner: | set to danielk |
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Status: | new → accepted |
comment:2 Changed 12 years ago by
Milestone: | unknown → 0.25 |
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comment:3 Changed 12 years ago by
Resolution: | → Fixed |
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Status: | accepted → closed |
commit [79d7af902c7ebcf218f3d4289ee23a196708e981] Author: Daniel Kristjansson <danielk@…> Date: Mon Apr 2 17:35:28 2012 -0400
Fixes #10453. Fix deadlock in DVBStreamHandler.
This is the same as the bug recently fixed in CetonStreamHandler?.
threaded stack trace