Re: did SVN r227753 (locale changes) break something?

On 11/22/11 08:37, David Chisnall wrote:
> Do you have valgrind installed?  It would probably also be helpful to see the results from that.

With symbols for libc ..

#0  xlocale_retain (val=0x0) at atomic.h:363
363     ATOMIC_ASM(add,      long,  "addl %1,%0",  "ir",  v);
[New Thread 28804300 (LWP 100592/vlc)]
(gdb) bt
#0  xlocale_retain (val=0x0) at atomic.h:363
#1  0x283eb568 in dupcomponent (type=3, base=Variable "base" is not 
available.
) at /usr/home/imb/svn/head/lib/libc/locale/xlocale.c:204
#2  0x283eb709 in newlocale (mask=Variable "mask" is not available.
) at /usr/home/imb/svn/head/lib/libc/locale/xlocale.c:250
#3  0x281637f2 in msg_Subscribe () from /usr/local/lib/libvlccore.so.4
#4  0x00000000 in ?? ()
#5  0x28191f6f in .rodata () from /usr/local/lib/libvlccore.so.4
#6  0x28420120 in __xlocale_global_locale () from /lib/libc.so.7
#7  0x00000000 in ?? ()
#8  0x281a3ee0 in .got () from /usr/local/lib/libvlccore.so.4
#9  0x288400fc in ?? ()
#10 0x288400fc in ?? ()
#11 0x280ca9b6 in libvlc_InternalCreate () from 
/usr/local/lib/libvlccore.so.4
#12 0x281a4df4 in .bss () from /usr/local/lib/libvlccore.so.4
#13 0x0000005c in ?? ()
#14 0xfffffd66 in ?? ()
#15 0x281861d4 in .rodata () from /usr/local/lib/libvlccore.so.4
#16 0x00000440 in ?? ()
#17 0x00000001 in ?? ()
#18 0x00000000 in ?? ()
#19 0x280b4ad0 in .got () from /usr/local/lib/libvlc.so.7
#20 0xbfbfe640 in ?? ()
#21 0x00000002 in ?? ()
#22 0xbfbfe678 in ?? ()
#23 0x280a39b2 in libvlc_new () from /usr/local/lib/libvlc.so.7
Previous frame inner to this frame (corrupt stack?)

  .. and valgrind shows ..

imb_at_toshi:/home/imb> valgrind vlc
==41007== Memcheck, a memory error detector
==41007== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==41007== Using Valgrind-3.6.1 and LibVEX; rerun with -h for copyright info
==41007== Command: vlc
==41007==
VLC media player 1.1.12 The Luggage (revision exported)
==41007== Invalid read of size 4
==41007==    at 0x3BC253: ??? (atomic.h:363)
==41007==    by 0x3BC567: ??? (xlocale.c:204)
==41007==    by 0x3BC708: newlocale (xlocale.c:250)
==41007==    by 0x1347F1: msg_Create (in /usr/local/lib/libvlccore.so.4)
==41007==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==41007==
==41007==
==41007== Process terminating with default action of signal 11 
(SIGSEGV): dumping core
==41007==  Access not within mapped region at address 0x0
==41007==    at 0x3BC253: ??? (atomic.h:363)
==41007==    by 0x3BC567: ??? (xlocale.c:204)
==41007==    by 0x3BC708: newlocale (xlocale.c:250)
==41007==    by 0x1347F1: msg_Create (in /usr/local/lib/libvlccore.so.4)
==41007==  If you believe this happened as a result of a stack
==41007==  overflow in your program's main thread (unlikely but
==41007==  possible), you can try to increase the size of the
==41007==  main thread stack using the --main-stacksize= flag.
==41007==  The main thread stack size used in this run was 16777216.
==41007==
==41007== HEAP SUMMARY:
==41007==     in use at exit: 9,284 bytes in 76 blocks
==41007==   total heap usage: 79 allocs, 3 frees, 9,316 bytes allocated
==41007==
==41007== LEAK SUMMARY:
==41007==    definitely lost: 0 bytes in 0 blocks
==41007==    indirectly lost: 0 bytes in 0 blocks
==41007==      possibly lost: 554 bytes in 13 blocks
==41007==    still reachable: 8,730 bytes in 63 blocks
==41007==         suppressed: 0 bytes in 0 blocks
==41007== Rerun with --leak-check=full to see details of leaked memory
==41007==
==41007== For counts of detected and suppressed errors, rerun with: -v
==41007== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Segmentation fault

  .. so it looks like a NULL pointer but I guess I need to recompile 
libvlc to see if it's involved,

	imb