Hi Lockal, from the stacktrace it looks like a null pointer's being
dereferenced in tr_sessionLock()'s call to "tr_lockLock
(session->lock);" ... however, session->lock is initialized on startup
and then never changed until shutdown. So maybe the crash reporter tool
got confused with which report it sent with your summary, or maybe
there's some memory corruption going on that NULLed that pointer out.

Lockal, are you able to reproduce this bug?

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Packages, which is subscribed to transmission in Ubuntu.
https://bugs.launchpad.net/bugs/1199082

Title:
  transmission-gtk crashed with SIGSEGV in __GI___pthread_mutex_lock()

Status in “transmission” package in Ubuntu:
  New

Bug description:
  Transmission crashed after rightclicking while navigating the torrent
  list in main window.

  Not sure how to reproduce, but the stack trace may indicate in which
  circumstances it crashed.

  ProblemType: Crash
  DistroRelease: Ubuntu 13.10
  Package: transmission-gtk 2.80-0ubuntu1
  ProcVersionSignature: Ubuntu 3.10.0-2.10-generic 3.10.0
  Uname: Linux 3.10.0-2-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.10.2-0ubuntu3
  Architecture: amd64
  Date: Tue Jul  9 01:58:08 2013
  ExecutablePath: /usr/bin/transmission-gtk
  InstallationDate: Installed on 2012-02-05 (519 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20120201.1)
  MarkForUpload: True
  ProcCmdline: transmission-gtk /tmp/[pornolab.net].t1671921.torrent
  SegvAnalysis:
   Segfault happened at: 0x7f97cc6a0f94 <__GI___pthread_mutex_lock+4>:  mov    
0x10(%rdi),%esi
   PC (0x7f97cc6a0f94) ok
   source "0x10(%rdi)" (0x0000001c) not located in a known VMA region (needed 
readable region)!
   destination "%esi" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: transmission
  StacktraceTop:
   __GI___pthread_mutex_lock (mutex=0x7f97a8573dc0) at pthread_mutex_lock.c:50
   tr_lockLock ()
   tr_torrentRecheckCompleteness ()
   ?? ()
   ?? ()
  Title: transmission-gtk crashed with SIGSEGV in __GI___pthread_mutex_lock()
  UpgradeStatus: Upgraded to saucy on 2013-05-19 (50 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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