[Tcl-bugs] Crash on exit on Fedora 17

[Julien T. <jul...@sp...>]

Hello,

Our TCL-based application crashes from times to times on exit. The crash 
seems to occurs in the TCL thread. Here is the backtrace:

#0  0x00000000019de02e in Tcl_MutexUnlock (mutexPtr=0x0)
     at 
/home/julien/Certitude/main_line/thirdparty/tcl8.5.11/unix/../unix/tclUnixThrd.c:556
#1  0x00000000019bfa06 in UnlockBucket (cachePtr=0x7feecc00ae10, bucket=5)
     at 
/home/julien/Certitude/main_line/thirdparty/tcl8.5.11/unix/../generic/tclThreadAlloc.c:814
#2  0x00000000019bfb94 in PutBlocks (cachePtr=0x7feecc00ae10, bucket=5, 
numMove=5)
     at 
/home/julien/Certitude/main_line/thirdparty/tcl8.5.11/unix/../generic/tclThreadAlloc.c:863
#3  0x00000000019bec18 in TclFreeAllocCache (arg=0x7feecc00ae10)
     at 
/home/julien/Certitude/main_line/thirdparty/tcl8.5.11/unix/../generic/tclThreadAlloc.c:240
#4  0x00000000019de3bb in TclpFreeAllocCache (ptr=0x7feecc00ae10)
     at 
/home/julien/Certitude/main_line/thirdparty/tcl8.5.11/unix/../unix/tclUnixThrd.c:818
#5  0x000000372cc07b12 in __nptl_deallocate_tsd () from 
/lib64/libpthread.so.0
#6  0x000000372cc07d22 in start_thread () from /lib64/libpthread.so.0
#7  0x000000372c8f199d in clone () from /lib64/libc.so.6

This problems only occurs on Fedora 17. Our application runs for years 
on many other Linux distributions without problem.

Changing the Tcl_MutexUnlock and Tcl_MutexLock function to check for 
null pointers seems to solve the issue, but this is probably not the 
right solution, and something is certainly wrong elsewhere.

So is there a bug is the TCL thread handling ? Or is something wrong in 
our application ? Any idea ?

We use TCL 8.5.11, and it is is compiled as follow:
./configure --enable-threads --enable-gcc --disable-langinfo 
--disable-shared

Thank you in advance.

Julien