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The Basics
Id: 19174
Status: open
Priority: 0/
Queue: Event-Lib

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Owner: Nobody in particular
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Bug Information
Severity: Critical
Broken in: 1.00
Fixed in: (no value)



Subject: Segfault in do_callback on OpenBSD 3.9
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I'm using Event-Lib-1.00 and perl-5.8.6 on i386-openbsd-3.9. This problem seems to occur unpredictably when creating and deleting large numbers of events. It looks like do_callback is calling event_pending on an event that has already been freed. Here's the ktrace output and gdb backtrace: 25365 perl CALL munmap(0x883f8000,0x1000) 25365 perl RET munmap 0 25365 perl PSIG SIGSEGV SIG_DFL code 1 addr=0x883f87d0 trapno=1 25365 perl NAMI "perl.core" #0 event_pending (ev=0x883f8780, event=29560, tv=0x0) at /usr/src/lib/libevent/event.c:509 #1 0x024d7084 in do_callback (fd=49, event=4, ev=0x85527a58) at Lib.xs:209 #2 0x02f186f4 in event_process_active (base=0x82962240) at /usr/src/lib/libevent/event.c:261 #3 0x02f1895a in event_base_loop (base=0x82962240, flags=1) at /usr/src/lib/libevent/event.c:375 #4 0x02f187e3 in event_loop (flags=1) at /usr/src/lib/libevent/event.c:310 #5 0x024d94aa in XS_Event__Lib_event_one_loop (cv=0x84f4e688) at Lib.xs:648 #6 0x08c8afe4 in Perl_pp_entersub () at /usr/src/gnu/usr.bin/perl/pp_hot.c:2890 #7 0x08cecc29 in Perl_runops_standard () at /usr/src/gnu/usr.bin/perl/run.c:37 #8 0x08cdb457 in S_run_body (oldscope=1) at /usr/src/gnu/usr.bin/perl/perl.c:1936 #9 0x08cdb257 in perl_run (my_perl=0x7d553030) at /usr/src/gnu/usr.bin/perl/perl.c:1855 #10 0x1c0012e6 in main ()
Subject: WG: [rt.cpan.org #19174] Segfault in do_callback on OpenBSD 3.9
Date: Fri, 02 Jun 2006 13:18:00 -0400
To: bug-Event-Lib [...] rt.cpan.org
From: Tassilo von Parseval <Tassilo.von.Parseval [...] rwth-aachen.de>
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Thank you for the report and sorry for not getting back to you earlier. I am not yet in the situation to work in this segfault as I just started a new job in NYC and am not yet fully settled. Once I am, I will investigate. Cheers, Tassilo Show quoted text
----- Originalnachricht ----- Von: Guest via RT <bug-Event-Lib@rt.cpan.org> Datum: Dienstag, Mai 9, 2006 7:29 pm Betreff: [rt.cpan.org #19174] Segfault in do_callback on OpenBSD 3.9
> > Tue May 09 19:29:50 2006: Request 19174 was acted upon. > Transaction: Ticket created by guest > Queue: Event-Lib > Subject: Segfault in do_callback on OpenBSD 3.9 > Owner: Nobody > Requestors: > Status: new > Ticket <URL: http://rt.cpan.org/Ticket/Display.html?id=19174 > > > > I'm using Event-Lib-1.00 and perl-5.8.6 on i386-openbsd-3.9. This > problem seems to occur unpredictably when creating and deleting large > numbers of events. It looks like do_callback is calling > event_pending on > an event that has already been freed. > > Here's the ktrace output and gdb backtrace: > > 25365 perl CALL munmap(0x883f8000,0x1000) > 25365 perl RET munmap 0 > 25365 perl PSIG SIGSEGV SIG_DFL code 1 addr=0x883f87d0 trapno=1 > 25365 perl NAMI "perl.core" > > #0 event_pending (ev=0x883f8780, event=29560, tv=0x0) > at /usr/src/lib/libevent/event.c:509 > #1 0x024d7084 in do_callback (fd=49, event=4, ev=0x85527a58) at > Lib.xs:209#2 0x02f186f4 in event_process_active (base=0x82962240) > at /usr/src/lib/libevent/event.c:261 > #3 0x02f1895a in event_base_loop (base=0x82962240, flags=1) > at /usr/src/lib/libevent/event.c:375 > #4 0x02f187e3 in event_loop (flags=1) at > /usr/src/lib/libevent/event.c:310#5 0x024d94aa in > XS_Event__Lib_event_one_loop (cv=0x84f4e688) at Lib.xs:648 > #6 0x08c8afe4 in Perl_pp_entersub () at > /usr/src/gnu/usr.bin/perl/pp_hot.c:2890 > #7 0x08cecc29 in Perl_runops_standard () at > /usr/src/gnu/usr.bin/perl/run.c:37 > #8 0x08cdb457 in S_run_body (oldscope=1) at > /usr/src/gnu/usr.bin/perl/perl.c:1936 > #9 0x08cdb257 in perl_run (my_perl=0x7d553030) > at /usr/src/gnu/usr.bin/perl/perl.c:1855 > #10 0x1c0012e6 in main () > >
Subject: WG: [rt.cpan.org #19174] Segfault in do_callback on OpenBSD 3.9
Date: Fri, 02 Jun 2006 13:18:00 -0400
To: bug-Event-Lib [...] rt.cpan.org
From: Tassilo von Parseval <Tassilo.von.Parseval [...] rwth-aachen.de>
Download (untitled) / with headers
text/plain 2.1k
Thank you for the report and sorry for not getting back to you earlier. I am not yet in the situation to work in this segfault as I just started a new job in NYC and am not yet fully settled. Once I am, I will investigate. Cheers, Tassilo Show quoted text
----- Originalnachricht ----- Von: Guest via RT <bug-Event-Lib@rt.cpan.org> Datum: Dienstag, Mai 9, 2006 7:29 pm Betreff: [rt.cpan.org #19174] Segfault in do_callback on OpenBSD 3.9
> > Tue May 09 19:29:50 2006: Request 19174 was acted upon. > Transaction: Ticket created by guest > Queue: Event-Lib > Subject: Segfault in do_callback on OpenBSD 3.9 > Owner: Nobody > Requestors: > Status: new > Ticket <URL: http://rt.cpan.org/Ticket/Display.html?id=19174 > > > > I'm using Event-Lib-1.00 and perl-5.8.6 on i386-openbsd-3.9. This > problem seems to occur unpredictably when creating and deleting large > numbers of events. It looks like do_callback is calling > event_pending on > an event that has already been freed. > > Here's the ktrace output and gdb backtrace: > > 25365 perl CALL munmap(0x883f8000,0x1000) > 25365 perl RET munmap 0 > 25365 perl PSIG SIGSEGV SIG_DFL code 1 addr=0x883f87d0 trapno=1 > 25365 perl NAMI "perl.core" > > #0 event_pending (ev=0x883f8780, event=29560, tv=0x0) > at /usr/src/lib/libevent/event.c:509 > #1 0x024d7084 in do_callback (fd=49, event=4, ev=0x85527a58) at > Lib.xs:209#2 0x02f186f4 in event_process_active (base=0x82962240) > at /usr/src/lib/libevent/event.c:261 > #3 0x02f1895a in event_base_loop (base=0x82962240, flags=1) > at /usr/src/lib/libevent/event.c:375 > #4 0x02f187e3 in event_loop (flags=1) at > /usr/src/lib/libevent/event.c:310#5 0x024d94aa in > XS_Event__Lib_event_one_loop (cv=0x84f4e688) at Lib.xs:648 > #6 0x08c8afe4 in Perl_pp_entersub () at > /usr/src/gnu/usr.bin/perl/pp_hot.c:2890 > #7 0x08cecc29 in Perl_runops_standard () at > /usr/src/gnu/usr.bin/perl/run.c:37 > #8 0x08cdb457 in S_run_body (oldscope=1) at > /usr/src/gnu/usr.bin/perl/perl.c:1936 > #9 0x08cdb257 in perl_run (my_perl=0x7d553030) > at /usr/src/gnu/usr.bin/perl/perl.c:1855 > #10 0x1c0012e6 in main () > >


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