On Mon, 27 Jul 2009, Elliot Shank wrote:
> Using Strawberry Perl 5.10.0.4, t/50-errno.t crashes perl during test
> 8. I tracked it down to r834, it works in r833 and crashes up through
> the current r847.
I can reproduce the problem too (with MSC instead of GCC). It seems to happen
in the SvOK() test in this part of the code:
/* Should we calculate the caller or can we reuse the caller_subr_entry?
* Sometimes we'll have a caller_subr_entry but it won't have the name yet.
* For example if the caller is an xsub that's callback into perl.
*/
if (profile_findcaller /* user wants us to calculate each time
*/
|| !caller_subr_entry /* we don't have a caller struct
*/
|| !caller_subr_entry->called_subpkg_pv /* we don't have caller details
*/
|| !SvOK(caller_subr_entry->called_subnam_sv)
The stack trace is:
subr_entry_setup(interpreter * 0x015d3fc4, cop * 0x01b806d8, subr_entry_st *
0x00000000) line 2433 + 26 bytes
pp_subcall_profiler(interpreter * 0x015d3fc4, int 0x00000000) line 2556 + 15
bytes
pp_entersub_profiler(interpreter * 0x015d3fc4) line 2488 + 13 bytes
caller_subr_entry->called_subnam_sv doesn't look like a valid SV*, but I can
access all the fields from the debugger, so I'm not sure why this is generating
an access violation. Or maybe I'm reading the disassembled code incorrectly;
I didn't disable -O2 yet. I can have another look tomorrow, but I thought
maybe the exact location gives you enough hints to understand what might be
going wrong.
Cheers,
-Jan
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