[mythtv-commits] Ticket #10201: invalid fastbin entry (free) on playback start (mythfrontend, mythcommflag) (was: mythfrontend: invalid fastbin entry)

[MythTV]

#10201: invalid fastbin entry (free) on playback start (mythfrontend, mythcommflag)
-------------------------------------------------+-------------------------
 Reporter:  Chad Sawatzky <chad.sawatzky@…>      |          Owner:
     Type:  Bug Report - Crash                   |         Status:  closed
 Priority:  minor                                |      Milestone:  unknown
Component:  MythTV - Video Playback              |        Version:  0.24.1
 Severity:  medium                               |     Resolution:
 Keywords:  mythfrontend playback livetv         |  Unverified
  recordings                                     |  Ticket locked:  1
-------------------------------------------------+-------------------------

Comment (by mdean):

 The issue reported here by Chad (the OP) and mentioned by D. Hugh
 Redelmeier at https://bugs.launchpad.net/mythbuntu/+bug/1186626 and
 http://www.gossamer-threads.com/lists/mythtv/users/544688#544688 (and
 likely the same one mentioned by others in that thread--though I can't be
 sure since they didn't get backtraces) is not the due to the broken test
 in glibc that was shipped with some versions of Red-Hat-based distros.
 (Chad confirmed he had the fix for the glibc issue at http://www.gossamer-
 threads.com/lists/mythtv/users/501857#501857 and Ubuntu 12.10 is using a
 post-fix release of eglibc.)

 That said, the abort is occurring in (e)glibc, seemingly when
 tzset_internal() calls free on old_tz (a pointer to the previously-set
 time zone), which seems to be pointing to an invalid area of memory.  This
 code was reached when MythTV called start() on a MythTimer (which calls
 start() on a QTime).  I don't see any obvious issues with the MythTV code,
 so I'm still leaning toward an upstream problem with one of the libraries.

 If anyone sees a problem with the MythTV code that I'm missing, please let
 me know.

-- 
Ticket URL: <http://code.mythtv.org/trac/ticket/10201#comment:12>
MythTV <http://code.mythtv.org/trac>
MythTV Media Center