[mythtv-commits] Ticket #10453: hung backend thread after failed recording?

MythTV noreply at mythtv.org
Wed Mar 14 13:19:49 UTC 2012


#10453: hung backend thread after failed recording?
------------------------------+--------------------------------------------
 Reporter:  brian@…           |           Type:  Bug Report - Hang/Deadlock
   Status:  new               |       Priority:  minor
Milestone:  unknown           |      Component:  MythTV - General
  Version:  Master Head       |       Severity:  medium
 Keywords:                    |  Ticket locked:  0
------------------------------+--------------------------------------------
 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.

-- 
Ticket URL: <http://code.mythtv.org/trac/ticket/10453>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center


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