id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,lang,patch,platform
1499,Null pointer dereference in imageio.pmc,arnsholt,plobsing,"Running Parrot r44371, Rakudo bf29be, OS X 10.6.2.

When running perl6 t/spec/S32-trig/sinh.t I get intermittent segfaults. I've recompiled both Parrot and Rakudo with debugging symbols, giving the following gdb backtrace:

{{{
(gdb) back
#0  0x0000000000000000 in ?? ()
#1  0x0000000100ce13ec in visit_todo_list_freeze (interp=0x101208890, pmc=0x10cadd220, info=0x10cadd1f8) at imageio.pmc:204
#2  0x0000000100ce1c7b in Parrot_ImageIO_set_pmc (interp=0x101208890, pmc=0x10cadd1f8, p=0x10cadd220) at imageio.pmc:492
#3  0x0000000100b94e15 in Parrot_freeze (interp=0x101208890, pmc=0x10cadd220) at src/pmc_freeze.c:58
#4  0x0000000100c6d09d in Parrot_default_clone (interp=0x101208890, pmc=0x10cadd220) at default.pmc:1068
#5  0x0000000100b897fb in Parrot_oo_clone_object (interp=0x101208890, pmc=0x1061b7d18, class_=0x102217ea8, dest=0x0) at src/oo.c:291
#6  0x0000000100cf9dba in Parrot_Object_clone (interp=0x101208890, pmc=0x1061b7d18) at object.pmc:723
#7  0x00000001011be039 in Parrot_P6opaque_clone ()
#8  0x0000000100a9cc06 in Parrot_clone_p_p (cur_opcode=0x101303b08, interp=0x101208890) at set.ops:474
#9  0x0000000100b98864 in runops_fast_core (interp=0x101208890, runcore=0x10121c2b0, pc=0x101303b08) at src/runcore/cores.c:670
#10 0x0000000100b9736c in runops_int (interp=0x101208890, offset=202378) at src/runcore/main.c:549
#11 0x0000000100b5ad92 in runops (interp=0x101208890, offs=202378) at src/call/ops.c:112
#12 0x0000000100b5049e in Parrot_pcc_invoke_from_sig_object (interp=0x101208890, sub_obj=0x10256f868, call_object=0x1016f9f98) at src/call/pcc.c:314
#13 0x0000000100b50652 in Parrot_pcc_invoke_sub_from_c_args (interp=0x101208890, sub_obj=0x10256f868, sig=0x100d5cb7a ""P->"") at src/call/pcc.c:75
#14 0x0000000100b33c36 in Parrot_runcode (interp=0x101208890, argc=2, argv=0x7fff5fbff810) at src/embed.c:826
#15 0x0000000100000d69 in main ()
}}}

The line in imageio.pmc calls the VTABLE_push_pmc macro, which expands to a function pointer call to the push_pmc member in the vtable of info->todo, which is NULL in this case.",bug,closed,normal,,none,,medium,fixed,,,perl6,,darwin