Bug#511103: apache2-mpm-prefork: MPM Prefork/Itk Segmentation fault under heavy load
With the Lenny's kernel (2.6.26-1-amd64), I can't reproduce the bug but there is an error message on the console : [ 123.197934] TCPv6: Possible SYN flooding on port 80. Dropping request. I've joined my custom kernel config (I'm using the same base for 150 servers and it's the first time there is such issue). This is https://issues.apache.org/bugzilla/show_bug.cgi?id=46467 . Try (on 2.6.27) echo 1024 /proc/sys/fs/epoll/max_user_instances where 1024 is some value larger than MaxClients, then it should work. The above bug report also has a patch that makes apache log an error message instead of segfaulting. Cheers, Stefan -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Bug#511103: apache2-mpm-prefork: MPM Prefork/Itk Segmentation fault under heavy load
Stefan Fritsch a écrit : This is https://issues.apache.org/bugzilla/show_bug.cgi?id=46467 . Try (on 2.6.27) echo 1024 /proc/sys/fs/epoll/max_user_instances where 1024 is some value larger than MaxClients, then it should work. The above bug report also has a patch that makes apache log an error message instead of segfaulting The max_user_instances limitation comes from 2.6.27.8 I confirm that changing epoll/max_user_instances fixes the bug. Maybe Debian should upper the default value to 1024, set it to Apache's MaxClient or backport Apache's patch because 128 is too low for a web server. Many thanks. Frédéric. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Bug#511103: apache2-mpm-prefork: MPM Prefork/Itk Segmentation fault under heavy load
Package: apache2-mpm-prefork Version: 2.2.9-10+lenny1 Severity: normal Under some heavy load, with the default configuration and even without any module, apache2 segfaults : [Wed Jan 07 14:42:27 2009] [notice] child pid 11525 exit signal Segmentation fault (11) [Wed Jan 07 14:42:27 2009] [notice] child pid 11526 exit signal Segmentation fault (11) [Wed Jan 07 14:42:27 2009] [notice] child pid 11527 exit signal Segmentation fault (11) [Wed Jan 07 14:42:27 2009] [notice] child pid 11528 exit signal Segmentation fault (11) Tested on 2 different servers (64bit) and can be reproduced with : ab -n 10 -c 500 http://localhost/ No issue with apache2-mpm-worked. -- System Information: Debian Release: 5.0 APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 2.6.27.8-em64t (SMP w/4 CPU cores) Locale: lang=fr...@euro, lc_ctype=fr...@euro (charmap=ISO-8859-15) Shell: /bin/sh linked to /bin/bash Versions of packages apache2-mpm-prefork depends on: ii apache2.2-common 2.2.9-10+lenny1 Apache HTTP Server common files ii libapr1 1.2.12-5The Apache Portable Runtime Librar ii libaprutil1 1.2.12+dfsg-8 The Apache Portable Runtime Utilit ii libc62.7-16 GNU C Library: Shared libraries ii libpcre3 7.6-2.1 Perl 5 Compatible Regular Expressi apache2-mpm-prefork recommends no packages. apache2-mpm-prefork suggests no packages. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
Bug#511103: apache2-mpm-prefork: MPM Prefork/Itk Segmentation fault under heavy load
Hi, On Wednesday 07 January 2009, Frederic VANNIERE wrote: Under some heavy load, with the default configuration and even without any module, apache2 segfaults : I cannot reproduce this. Please provide a backtrace as described in /usr/share/doc/apache2.2-common/README.backtrace Cheers, Stefan -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org
