Crash Dump Analysis Patterns (Part 1, Mac OS X)
The first Windows pattern called Multiple Exceptions in user mode now has Mac OS X equivalent. In the example below there are 3 threads and two of them experienced NULL Pointer (data) access violation exception:
(gdb) thread apply all bt full
Thread 3 (core thread 2):
#0 0x00000001062ffe4e in thread_two (arg=0x0)
at main.c:24
p = (int *) 0×0
#1 0×00007fff8abf58bf in _pthread_start ()
No symbol table info available.
#2 0×00007fff8abf8b75 in thread_start ()
No symbol table info available.
Thread 2 (core thread 1):
#0 0x00000001062ffe1e in thread_one (arg=0x0)
at main.c:16
p = (int *) 0×0
#1 0×00007fff8abf58bf in _pthread_start ()
No symbol table info available.
#2 0×00007fff8abf8b75 in thread_start ()
No symbol table info available.
Thread 1 (core thread 0):
#0 0x00007fff854e0e42 in __semwait_signal ()
No symbol table info available.
#1 0x00007fff8ababdea in nanosleep ()
No symbol table info available.
#2 0x00007fff8ababc2c in sleep ()
No symbol table info available.
#3 0x00000001062ffec3 in main (argc=1, argv=0x7fff65efeab8)
at main.c:36
threadID_one = (pthread_t) 0×1063b4000
threadID_two = (pthread_t) 0×106581000
(gdb) thread 2
[Switching to thread 2 (core thread 1)]
0x00000001062ffe1e in thread_one (arg=0x0)
at main.c:16
16 *p = 1;
(gdb) p/x p
$1 = 0×0
(gdb) thread 3
[Switching to thread 3 (core thread 2)]
0x00000001062ffe4e in thread_two (arg=0x0)
at main.c:24
24 *p = 2;
(gdb) p/x p
$2 = 0×0
- Dmitry Vostokov @ DumpAnalysis.org + TraceAnalysis.org -