Strange segfault with subs=0
Alex Hunsaker
>> Ok lets try disabling some things:
>> # NYTPROF="subs=0:blocks=0:stmts=0:savesrc=0" httpd
>> Segmentation fault
> Um. With subs=0 the resolve_sub_to_cv() shouldn't be called so I suspect
> this is a different problem.
# NYTPROF="subs=0:blocks=0:stmts=0:savesrc=0" gdb --args httpd -X
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Reading symbols from /usr/sbin/httpd...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/sbin/httpd -X
[Thread debugging using libthread_db enabled]
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff3e17e81 in Perl_pp_entersub () from
/usr/lib/perl5/core_perl/CORE/libperl.so
(gdb) bt
#0 0x00007ffff3e17e81 in Perl_pp_entersub () from
/usr/lib/perl5/core_perl/CORE/libperl.so
#1 0x00007ffff305b1bf in pp_subcall_profiler (is_slowop=0) at NYTProf.xs:2416
#2 0x00007ffff305b056 in pp_entersub_profiler () at NYTProf.xs:2373
#3 0x00007ffff3d9a602 in Perl_call_sv () from
/usr/lib/perl5/core_perl/CORE/libperl.so
#4 0x00007ffff409e24a in modperl_perl_call_list () from
/usr/lib/httpd/modules/mod_perl.so
#5 0x00007ffff40a7a13 in modperl_perl_destruct () from
/usr/lib/httpd/modules/mod_perl.so
#6 0x00007ffff40a7a82 in modperl_shutdown.2753 () from
/usr/lib/httpd/modules/mod_perl.so
#7 0x00007ffff770fb1d in run_cleanups () from /usr/lib/libapr-1.so.0
#8 0x00007ffff7710687 in apr_pool_destroy () from /usr/lib/libapr-1.so.0
#9 0x00007ffff77108ad in apr_pool_clear () from /usr/lib/libapr-1.so.0
#10 0x00007ffff7fc3f0d in main ()
I tried with trace=99 but I just have a zero length log file :-( I
think ill need a debug enable perl to get anywhere with this one. BTW
this problem and the strange "Undefined subroutine &main:: with
start=no" go away when im not using Archive::Zip.
Alex Hunsaker
>>On Fri, Jun 25, 2010 at 04:47, Tim Bunce <Tim....@pobox.com> wrote:
>
>>> Ok lets try disabling some things:
>>> # NYTPROF="subs=0:blocks=0:stmts=0:savesrc=0" httpd
>>> Segmentation fault
>
>> Um. With subs=0 the resolve_sub_to_cv() shouldn't be called so I suspect
>> this is a different problem.
> I tried with trace=99 but I just have a zero length log file :-( I
> think ill need a debug enable perl to get anywhere with this one. BTW
> this problem and the strange "Undefined subroutine &main:: with
> start=no" go away when im not using Archive::Zip.
Yay! I traced it from Archive::Zip to File::Temp to this bit of perl:
{
...
# Set up an end block to use these arrays
END {
local($., $@, $!, $^E, $?);
cleanup();
}
}
If I comment out the local and clean() and have everything else in the
starting block commented out, it still segfaults. If I comment out
just the END it works. Then I verified If I stuck { END { } } instead
of using File::Temp it still broke