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From bugzi...@apache.org
Subject [Bug 55448] New: segfault in set_max_workers at event.c:3194 on SIGUSR1
Date Mon, 19 Aug 2013 08:33:06 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=55448

            Bug ID: 55448
           Summary: segfault in set_max_workers at event.c:3194 on SIGUSR1
           Product: Apache httpd-2
           Version: 2.4.6
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mpm_event
          Assignee: bugs@httpd.apache.org
          Reporter: fhimpe@vub.ac.be

When logrotate did its work this week-end, it ran /etc/init.d/apache2 reload. 

In the log files:

[Sun Aug 18 06:25:51.267032 2013] [mpm_event:notice] [pid 7618:tid
140663945377600] AH00493: SIGUSR1 received.  Doing graceful restart
[Sun Aug 18 06:25:51.501217 2013] [ssl:warn] [pid 7618:tid 140663945377600]
AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS
server name indication support (RFC 4366)
[Sun Aug 18 06:25:51.501469 2013] [mpm_event:notice] [pid 7618:tid
140663945377600] AH00489: Apache/2.4.6 (Debian) SVN/1.7.9 OpenSSL/1.0.1e
mod_wsgi/3.4 Python/2.7.3 configured -- resuming normal operations
[Sun Aug 18 06:25:51.501500 2013] [core:notice] [pid 7618:tid 140663945377600]
AH00094: Command line: '/usr/sbin/apache

at this time, a core file was generated with this backtrace: 

(gdb) core core-apache2.9927
[New LWP 9927]
warning: Can't read pathname for load map: Input/output error.
warning:
"/usr/lib/debug/.build-id/d1/7ee702718ddcd69e0be5db24b49a2bd4ab720e.debug":
separate debug info file has no debug info
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
warning:
"/usr/lib/debug/.build-id/2d/7fb1beefaa5a7ca4e13df623b1c8ea41ac16ff.debug":
separate debug info file has no debug info
warning: no loadable sections found in added symbol-file system-supplied DSO at
0x7ffff9312000
Core was generated by `/usr/sbin/apache2 -k start'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007feed931b970 in set_max_workers (cmd=0x3, dummy=<optimized out>,
arg=0x7feee06b1358 "") at event.c:3194
3194    event.c: No such file or directory.
(gdb) thread apply all bt

Thread 1 (Thread 0x7feee07f3740 (LWP 9927)):
#0  0x00007feed931b970 in set_max_workers (cmd=0x3, dummy=<optimized out>,
arg=0x7feee06b1358 "") at event.c:3194
#1  0x0000000000000000 in ?? ()

I'm running Apache httpd 2.4.6 on Debian GNU/Linux Wheezy AMD64.

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