[MacRuby-devel] How can I catch segment faults?

[B. Ohr (dev)]

Hey, after installing r2590 with backtrace support (thanks for that!)  
now I have the problem to catch segment faults.

It seems to be a problem inside of a hash#each_pair, but I have  
absolutely no idea where, and because it is foreign code a file name  
and line number would be more than useful!

-------

(gdb) run ../xx.rb compile
Starting program: /usr/local/bin/macruby ../xx.rb compile
Reading symbols for shared libraries + done
Loading site data...

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x00007fff60771b60
0x0000000100d90283 in _cache_getMethod ()

(gdb) backtrace
#0  0x0000000100d90283 in _cache_getMethod ()
#1  0x0000000100d8fa43 in look_up_method ()
#2  0x0000000100176c4d in __rb_vm_dispatch [inlined] () at /Users/box/ 
Documents/dev/macruby/macruby/vm.cpp:2780
#3  0x0000000100176c4d in rb_vm_dispatch (cache=0x108fcfac0,  
self=140734799741824, sel=0x102b8b570, block=0x0, opt=0 '\0', argc=1)  
at vm.cpp:3154
#4  0x0000000104152605 in ?? ()
#5  0x00000001001752b6 in rb_vm_yield0 [inlined] () at /Users/box/ 
Documents/dev/macruby/macruby/vm.cpp:4207
#6  0x00000001001752b6 in rb_vm_yield (argc=6687904,  
argv=0x7fff5fbf56f0) at vm.cpp:4214
#7  0x000000010011a978 in rb_yield_0 [inlined] () at /Users/box/ 
Documents/dev/macruby/macruby/vm_eval.c:194
#8  0x000000010011a978 in rb_yield_values (n=<value temporarily  
unavailable, due to optimizations>) at vm_eval.c:226
#9  0x0000000100039c68 in inject_i (i=1, p=140734799741792,  
argc=6753408, argv=0x7fff5fbf5988) at enum.c:429
#10 0x00000001001741da in rb_vm_block_eval0 (b=0x2006403c0, sel=0x0,  
self=8596725184, argc=1, argv=0x10a64a860) at vm.cpp:4082
#11 0x00000001001752b6 in rb_vm_yield0 [inlined] () at /Users/box/ 
Documents/dev/macruby/macruby/vm.cpp:4207
#12 0x00000001001752b6 in rb_vm_yield (argc=1, argv=0x7fff5fbf5988) at  
vm.cpp:4214
#13 0x000000010011a1f0 in rb_yield (val=8596688000) at vm_eval.c:194
#14 0x000000010004d5f7 in each_pair_i (key=8596688000, value=0) at  
hash.c:1099
#15 0x0000000100050c2c in rb_hash_foreach (hash=<value temporarily  
unavailable, due to optimizations>, func=0x10004d5e0 <each_pair_i>,  
farg=0) at hash.c:108
#16 0x0000000100051321 in rb_hash_each_pair (hash=8596722368,  
sel=0x102b2b400) at hash.c:1125
#17 0x00000001001738e1 in rb_vm_call_with_cache2 (cache=0x102b2b490,  
block=0x2006403c0, self=8596722368, klass=4295299792, sel=0x102b2b400,  
argc=<value temporarily unavailable, due to optimizations>, argv=0x0)  
at vm.cpp:2336
#18 0x0000000100037fd8 in enum_inject (obj=8596722368, sel=<value  
temporarily unavailable, due to optimizations>, argc=<value  
temporarily unavailable, due to optimizations>, argv=<value  
temporarily unavailable, due to optimizations>) at enum.c:521
#19 0x0000000100177be1 in rb_vm_dispatch (cache=0x106e620b0,  
self=8596722368, sel=0x102b51b30, block=0x200640420, opt=2 '\002',  
argc=1) at vm.cpp:2679
#20 0x0000000104152410 in ?? ()
#21 0x0000000104151afe in ?? ()
#22 0x000000010415173b in ?? ()
#23 0x000000010006cbe7 in rb_class_new_instance_imp (klass=1,  
sel=<value temporarily unavailable, due to optimizations>,  
argc=6755200, argv=0x104152390) at object.c:1892
#24 0x0000000100177be1 in rb_vm_dispatch (cache=0x102b69670,  
self=8596901376, sel=0x102b2d8b0, block=0x0, opt=0 '\0', argc=1) at  
vm.cpp:2679
#25 0x000000010414fe2f in ?? ()
#26 0x000000010414f785 in ?? ()
#27 0x000000010413812e in ?? ()
#28 0x000000010414c561 in ?? ()
#29 0x00000001040808f2 in ?? ()
#30 0x000000010003f809 in ruby_run_node (n=0x200662500) at eval.c:198
#31 0x0000000100000dd8 in main (argc=3, argv=0x102b1ba90, envp=<value  
temporarily unavailable, due to optimizations>) at main.cpp:42