RE: [mp2] mod_perl 2.0.7 Segmentation fault in OutputFilter(?)

> I'm not a modperl expert, but I do know that modperl does some unusual
> things with threads and memory, to try to make separate threads act more
> like separate processes, i.e., to treat separate threads as though they
> had separate memory spaces.  However, I think it may depend on which
> [...]

Hi,
after my error.log also has shown other errors (see below) I switched from apaches worker MPM to prefork and now all errors and Segmentation faults are gone (at least for the last 10 hours)!
Does it mean that mod_perls PerlOutputFilterHandler isn't working under worker MPM? (At least in conjunction with mod_proxy?)

Best regards,
Petra

Attempt to free unreferenced scalar: SV 0x591a5e8, Perl interpreter: 0x577b5b0.
[Wed Jan 09 15:09:31 2013] [error] [client 1.2.3.4] Can't locate object method "ctx" via package "140558643449304" (perhaps you forgot to load "140558643449304"?) at /prb/local-perllib/Prb/OutputFilter.pm line 52.\n, referer: http://www.xxx.de/en.html
Attempt to free unreferenced scalar: SV 0x586dff0, Perl interpreter: 0x577b5b0.
*** glibc detected *** /prb/opt64/apache-2.2.23-20120913/bin/httpd: realloc(): invalid pointer: 0x000000000591a5e8 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x75916)[0x7fd6bbfec916]
/lib64/libc.so.6(realloc+0x2e2)[0x7fd6bbff26d2]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_safesysrealloc+0x10)[0x7fd6b5c922b0]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_hv_name_set+0xf2)[0x7fd6b5caa6e2]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_gv_fetchpvn_flags+0x760)[0x7fd6b5c4c380]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_gv_stashpvn+0x93)[0x7fd6b5c4d7c3]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_newSVrv+0xcf)[0x7fd6b5cc2e0f]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_sv_setref_pv+0x26)[0x7fd6b5cd0596]
/prb/opt64/apache-2.2.23-20120913/modules/mod_perl.so(modperl_ptr2obj+0x3c)[0x7fd6b5fa3e0c]
/prb/opt64/apache-2.2.23-20120913/modules/mod_perl.so(modperl_handler_make_args+0xba)[0x7fd6b5fa1cea]
/prb/opt64/apache-2.2.23-20120913/modules/mod_perl.so(modperl_run_filter+0x145)[0x7fd6b5fa7aa5]
/prb/opt64/apache-2.2.23-20120913/modules/mod_perl.so(modperl_output_filter_handler+0x45)[0x7fd6b5fa83a5]
/prb/opt64/apache-2.2.23-20120913/modules/mod_proxy_http.so(+0x383f)[0x7fd6b828a83f]
/prb/opt64/apache-2.2.23-20120913/modules/mod_proxy_http.so(+0x4c89)[0x7fd6b828bc89]
/prb/opt64/apache-2.2.23-20120913/modules/mod_proxy.so(proxy_run_scheme_handler+0x72)[0x7fd6b8493e82]
/prb/opt64/apache-2.2.23-20120913/modules/mod_proxy.so(+0x9587)[0x7fd6b8498587]
/prb/opt64/apache-2.2.23-20120913/bin/httpd(ap_invoke_handler+0x110)[0x43ca20]
/prb/opt64/apache-2.2.23-20120913/bin/httpd(ap_process_request+0x190)[0x449770]
/prb/opt64/apache-2.2.23-20120913/bin/httpd[0x446240]
/prb/opt64/apache-2.2.23-20120913/bin/httpd(ap_process_connection+0xb8)[0x442348]
/prb/opt64/apache-2.2.23-20120913/bin/httpd[0x451f84]
/lib64/libpthread.so.0(+0x7851)[0x7fd6bc311851]
/lib64/libc.so.6(clone+0x6d)[0x7fd6bc05f11d]




Attempt to free unreferenced scalar: SV 0x7fd6916ba468, Perl interpreter: 0x577b5b0.
[Wed Jan 09 11:11:33 2013] [error] [client 153.96.64.24] Can't call method "server" on unblessed reference at /prb/local-perllib/Prb/myHandler.pm line 423.\n
Attempt to free unreferenced scalar: SV 0x7fd6916ba468, Perl interpreter: 0x577b5b0.
*** glibc detected *** /prb/opt64/apache-2.2.23-20120913/bin/httpd: double free or corruption (!prev): 0x00007fd654000970 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x75916)[0x7fd6bbfec916]
/lib64/libc.so.6(+0x78443)[0x7fd6bbfef443]
/lib64/libc.so.6(+0x7b260)[0x7fd6bbff2260]
/lib64/libc.so.6(realloc+0xe5)[0x7fd6bbff24d5]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_safesysrealloc+0x10)[0x7fd6b5c922b0]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_hv_name_set+0xf2)[0x7fd6b5caa6e2]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_gv_fetchpvn_flags+0x760)[0x7fd6b5c4c380]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_gv_stashpvn+0x93)[0x7fd6b5c4d7c3]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_newSVrv+0xcf)[0x7fd6b5cc2e0f]
/prb/opt64/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so(Perl_sv_setref_pv+0x26)[0x7fd6b5cd0596]
/prb/opt64/apache-2.2.23-20120913/modules/mod_perl.so(modperl_ptr2obj+0x3c)[0x7fd6b5fa3e0c]
/prb/opt64/apache-2.2.23-20120913/modules/mod_perl.so(modperl_handler_make_args+0xba)[0x7fd6b5fa1cea]
/prb/opt64/apache-2.2.23-20120913/modules/mod_perl.so(modperl_callback_run_handlers+0x202)[0x7fd6b5fa0ac2]
/prb/opt64/apache-2.2.23-20120913/modules/mod_perl.so(modperl_callback_per_dir+0x2f)[0x7fd6b5fa14af]
/prb/opt64/apache-2.2.23-20120913/modules/mod_perl.so(modperl_response_handler+0xd3)[0x7fd6b5f9b4c3]
/prb/opt64/apache-2.2.23-20120913/bin/httpd(ap_invoke_handler+0x110)[0x43ca20]
/prb/opt64/apache-2.2.23-20120913/bin/httpd(ap_process_request+0x190)[0x449770]
/prb/opt64/apache-2.2.23-20120913/bin/httpd[0x446240]
/prb/opt64/apache-2.2.23-20120913/bin/httpd(ap_process_connection+0xb8)[0x442348]
/prb/opt64/apache-2.2.23-20120913/bin/httpd[0x451f84]
/lib64/libpthread.so.0(+0x7851)[0x7fd6bc311851]
/lib64/libc.so.6(clone+0x6d)[0x7fd6bc05f11d]