Bug#508432: minimum testcase

[Martín Ferrari]

Meanwhile this is solved, see the attached patch that's useful as a
workaround for fwknopd

On Sat, Feb 14, 2009 at 20:47, Martín Ferrari <tincho at debian.org> wrote:
> Hi, after working on this bug for a while, I was able to distill a
> minimum code that triggers the segfault. The callback routine invoked
> from pcap_loop needs to set a signal handler that it's used during the
> callback.
>
> In the fwknopd code, this happens when calling iptables, which triggers
> a SIGCHLD on exit, but can happen with any signal.
>
> The following backtrace makes me doubt if this is a Net::Pcap or a perl
> problem. Maybe somebody in the list can shed some light? (Hello Niko :))
>
> #0  0xb7e726c9 in free () from /lib/libc.so.6
> #1  0x080c5b70 in Perl_sv_clear ()
> #2  0x080c5d2a in Perl_sv_free2 ()
> #3  0x080e0a10 in Perl_leave_scope ()
> #4  0x080e137c in Perl_pop_scope ()
> #5  0x080b463d in Perl_pp_leavesub ()
> #6  0x080b1879 in Perl_runops_standard ()
> #7  0x080aba15 in Perl_call_sv ()
> #8  0xb7daf538 in callback_wrapper ()
> from /usr/lib/perl5/auto/Net/Pcap/Pcap.so
> #9  0xb7d75d45 in ?? () from /usr/lib/libpcap.so.0.8
> #10 0x08ae4558 in ?? ()
> #11 0xbf8a9e28 in ?? ()
> #12 0x08afb54a in ?? ()
> #13 0x00000020 in ?? ()
> #14 0xbf8a9e14 in ?? ()
> #15 0xbf8a9e38 in ?? ()
> #16 0xbf8a9e48 in ?? ()
> #17 0x080c4067 in Perl_sv_setsv_flags ()
> #18 0xb7d76bab in pcap_loop () from /usr/lib/libpcap.so.0.8
> #19 0xb7da9cf3 in XS_Net__Pcap_loop ()
>   from /usr/lib/perl5/auto/Net/Pcap/Pcap.so
> #20 0x080b32d2 in Perl_pp_entersub ()
> #21 0x080b1879 in Perl_runops_standard ()
> #22 0x080ac6a0 in perl_run ()
> #23 0x08063ddd in main ()
>
>
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>



-- 
Martín Ferrari
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