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From Joshua Marantz <jmara...@google.com>
Subject po
Date Thu, 01 Sep 2011 11:52:31 GMT
Hi,

I've been load-testing our module
(mod_pagespeed<http://code.google.com/speed/page-speed/docs/module.html>)
with httpd 2.2.16 built with these options:
     --enable-pool-debug --with-mpm=worker
I've been getting periodic aborts from apr_table_addn that don't look like
they are from my module.  These do not occur when using 'prefork'.

Here's a stack-trace recovered from a core file:

Program terminated with signal 6, Aborted.
#0  0x00007fdd3bbd9a75 in raise (sig=<value optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
64 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
 in ../nptl/sysdeps/unix/sysv/linux/raise.c
(gdb) where
#0  0x00007fdd3bbd9a75 in raise (sig=<value optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007fdd3bbdd5c0 in abort () at abort.c:92
#2  0x00007fdd3c9a2e57 in apr_table_addn (t=0xe84980, key=0xd51d60
"Accept-Encoding", val=0xd51d71 "identity") at tables/apr_tables.c:813
#3  0x0000000000433e36 in ap_get_mime_headers_core (r=0xf27de0, bb=0xdda3a0)
at protocol.c:799
#4  0x000000000043456b in ap_read_request (conn=0xe51620) at protocol.c:918
#5  0x000000000047f772 in ap_process_http_connection (c=0xe51620) at
http_core.c:183
#6  0x0000000000446e28 in ap_run_process_connection (c=0xe51620) at
connection.c:43
#7  0x00000000004b3297 in process_socket (thd=<value optimized out>,
dummy=<value optimized out>) at worker.c:544
#8  worker_thread (thd=<value optimized out>, dummy=<value optimized out>)
at worker.c:894
#9  0x00007fdd3c1339ca in start_thread (arg=<value optimized out>) at
pthread_create.c:300
#10 0x00007fdd3bc8c70d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112


Questions

1. Is this a bug in httpd?
2. Or could I somehow have caused this with a programming error in my
module?
3. Or is enable-pool-debug simply incompatible with the Worker MPM?

Thanks,
-Josh

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