Please do not reply directly to this email. All additional comments should be made in the comments box of this bug. https://bugzilla.redhat.com/show_bug.cgi?id=643298 Petr Pisar <ppisar@xxxxxxxxxx> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |ppisar@xxxxxxxxxx --- Comment #5 from Petr Pisar <ppisar@xxxxxxxxxx> 2010-11-18 05:12:37 EST --- It does not have to be problem within perl. There is lot of XS modules (Pg, DBI) that can confuse perl as they manipulate with internal data structures by hand. Quick investigation shows mg_free() is called from Perl_sv_clear(). The mg_free() is macro expanded to Perl_mg_free() which is probably in-lined by compiler because it's not shown in the backtrace. The backtrace shows EIP out of mapped memmory. Thus the program has been killed by SIGSEGV. The EIP equals to EAX. It's computed indirect address clearly. I guess it's following code: Perl_mg_free(pTHX_ SV *sv) { MAGIC* mg; MAGIC* moremagic; PERL_ARGS_ASSERT_MG_FREE; for (mg = SvMAGIC(sv); mg; mg = moremagic) { const MGVTBL* const vtbl = mg->mg_virtual; moremagic = mg->mg_moremagic; if (vtbl && vtbl->svt_free) â CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg); More precisely, it could be the vtbl->svt_free pointer that is called as data structure destructor. However it points to invalid text memory (EIP=0x0a03bd58). Problem is nobody knows where the vtbl->svt_free is set. It can come from any DBI or Pg code, however gdb does not see Perl variables and perl debuger does not see C variables. Also reporter should note whether he can reproduce this bug or it was just a spurious event. Because without stable reproducer it's hard to debug it. -- Configure bugmail: https://bugzilla.redhat.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. -- Fedora Extras Perl SIG http://www.fedoraproject.org/wiki/Extras/SIGs/Perl perl-devel mailing list perl-devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/perl-devel
