Bug 1500246

Description of problem:

Segmentation fault in PerlIOApache_flush

Version-Release number of selected component (if applicable):

mod_perl-2.0.10-2.el7.x86_64

How reproducible:

Occasionally

Steps to Reproduce:
1. Run Apache HTTP Server requests with mod_perl

Actual results:
Segmentation fault in PerlIOApache_flush

Expected results:
No segmentation fault

Additional info:

httpd-2.4.6-67.el7.x86_64
perl-libs-5.16.3-292.el7.x86_64

gdb /usr/sbin/httpd /var/apache-dump/core.26978
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-100.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/sbin/httpd...Reading symbols from /usr/sbin/httpd...(no debugging symbols found)...done.
(no debugging symbols found)...done.

warning: core file may not match specified executable file.
[New LWP 26978]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/opt/dms/rel/Qu -DFOREGROUND'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f7ac341f2e7 in PerlIOApache_flush ()
   from /etc/httpd/modules/mod_perl.so
Missing separate debuginfos, use: debuginfo-install httpd-2.4.6-67.el7_4.2.x86_64
(gdb) bt full
#0  0x00007f7ac341f2e7 in PerlIOApache_flush ()
   from /etc/httpd/modules/mod_perl.so
No symbol table info available.
#1  0x00007f7ac31a65ff in Perl_PerlIO_flush ()
   from /usr/lib64/perl5/CORE/libperl.so
No symbol table info available.
#2  0x00007f7ac31a6649 in Perl_PerlIO_flush ()
   from /usr/lib64/perl5/CORE/libperl.so
No symbol table info available.
#3  0x00007f7ac317b268 in Perl_pp_system ()
   from /usr/lib64/perl5/CORE/libperl.so
No symbol table info available.
#4  0x00007f7ac3128b86 in Perl_runops_standard ()
   from /usr/lib64/perl5/CORE/libperl.so
No symbol table info available.
#5  0x00007f7ac30c0168 in Perl_call_sv () from /usr/lib64/perl5/CORE/libperl.so
No symbol table info available.
#6  0x00007f7ac3419bf9 in modperl_callback ()
   from /etc/httpd/modules/mod_perl.so
No symbol table info available.
#7  0x00007f7ac341a408 in modperl_callback_run_handlers ()
   from /etc/httpd/modules/mod_perl.so
No symbol table info available.
#8  0x00007f7ac341a90f in modperl_callback_per_dir ()
   from /etc/httpd/modules/mod_perl.so
No symbol table info available.
#9  0x00007f7ac34152fb in modperl_response_handler_run ()
   from /etc/httpd/modules/mod_perl.so
No symbol table info available.
#10 0x00007f7ac3415536 in modperl_response_handler_cgi ()
   from /etc/httpd/modules/mod_perl.so
No symbol table info available.
#11 0x00005577cc2f1a10 in ap_run_handler ()
No symbol table info available.
#12 0x00005577cc2f1f59 in ap_invoke_handler ()
No symbol table info available.
#13 0x00005577cc306ada in ap_process_async_request ()
No symbol table info available.
#14 0x00005577cc306db4 in ap_process_request ()
No symbol table info available.
#15 0x00005577cc302fb2 in ap_process_http_connection ()
No symbol table info available.
#16 0x00005577cc2fb010 in ap_run_process_connection ()
No symbol table info available.
#17 0x00007f7ac821e80f in child_main ()
   from /etc/httpd/modules/mod_mpm_prefork.so
No symbol table info available.
#18 0x00007f7ac821ea55 in make_child ()
   from /etc/httpd/modules/mod_mpm_prefork.so
No symbol table info available.
#19 0x00007f7ac821eab6 in startup_children ()
   from /etc/httpd/modules/mod_mpm_prefork.so
No symbol table info available.
#20 0x00007f7ac821f7c0 in prefork_run ()
   from /etc/httpd/modules/mod_mpm_prefork.so
No symbol table info available.
#21 0x00005577cc2d615e in ap_run_mpm ()
No symbol table info available.
#22 0x00005577cc2ceed6 in main ()
No symbol table info available.