[fpc-devel] Segmentation fault for Firebird exception insidethread

[michael.vancanneyt at wisa.be]

On Thu, 27 Oct 2011, Ludo Brands wrote:

>>
>> What happens if you comipile with -gl and  run the program
>> under GDB ?
>> can you post a backtrace ?
>> Note that you may need to add a {$linklib pthread} to the
>> program source,
>> otherwise gdb may complain about missing threads support.
>>
>> The backtrace will show us exactly where the error occurs (or
>> it should).
>>
>> Michael.
>>
>
> Was able to reproduce with fb 2.5 on ubuntu 11.10 64 bit. The crash happens
> in the thread clean up code. Backtrace shows:
> #0  0x00007ffff66b5b00 in ?? ()
> #1  0x00007ffff7bc6ce3 in __nptl_deallocate_tsd ()
>   from /lib/x86_64-linux-gnu/libpthread.so.0
> #2  0x00007ffff7bc6f0a in start_thread ()
>   from /lib/x86_64-linux-gnu/libpthread.so.0
> #3  0x00007ffff76fd89d in clone () from /lib/x86_64-linux-gnu/libc.so.6
> #4  0x0000000000000000 in ?? ()
>
> Traced into __pthread_exit and the sigsegv happens in __pthread_unwind
> calling _Unwind_ForcedUnwind. This is an indication of c++ exception being
> not dealt with correctly and the exception (re?)raised by
> _Unwind_ForcedUnwind isn't caught.

If it is a C++ exception, then it is a firebird client bug.
The exceptions are not supposed to leave the fbclient library...

Michael.