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From Alexandru David Constantinescu <ald...@gmail.com>
Subject [users@httpd] proxy problems **** glibc detected ****
Date Wed, 12 Nov 2008 07:17:30 GMT
Hello all,

After many days of work, and docs read I have manage to get it work. Is 
a apache 2.2.10 compiled from source on a Centos 5 64b architecture as a 
reverse proxy. As a MPM I use prefork.
There are still minor problems like disk_cache but but nothing to worry 
. And when all the things seems to work , I start to see in my error log 
messages like :

*** glibc detected *** /usr/local/apache2/bin/httpd: free(): invalid 
pointer: 0x00000000171882f0 ***
======= Backtrace: =========
/lib64/libc.so.6[0x3fa6e71684]
/lib64/libc.so.6(cfree+0x8c)[0x3fa6e74ccc]
/usr/lib64/libapr-1.so.0(apr_allocator_destroy+0x1b)[0x2b967fe9d24b]
/usr/local/apache2/bin/httpd[0x4d3839]
/usr/local/apache2/bin/httpd[0x4d3b0e]
/lib64/libpthread.so.0[0x39bf40de80]
/usr/lib64/libpq.so.4(_fini+0x0)[0x2b96800cbae8]
======= Memory map: ========
00400000-0051e000 r-xp 00000000 08:03 4030714 
  /usr/local/apache2/bin/httpd
0071d000-00724000 rw-p 0011d000 08:03 4030714 
  /usr/local/apache2/bin/httpd
00724000-00729000 rw-p 00724000 00:00 0
1087a000-171a8000 rw-p 1087a000 00:00 0
3586800000-35868f1000 r-xp 00000000 08:03 12320783 
  /lib64/libdb-4.3.so
35868f1000-3586af0000 ---p 000f1000 08:03 12320783 
  /lib64/libdb-4.3.so
3586af0000-3586af5000 rw-p 000f0000 08:03 12320783 
  /lib64/libdb-4.3.so
3587800000-3587858000 r-xp 00000000 08:03 3740115 
  /usr/lib64/libsqlite3.so.0.8.6
3587858000-3587a58000 ---p 00058000 08:03 3740115 
  /usr/lib64/libsqlite3.so.0.8.6
3587a58000-3587a5a000 rw-p 00058000 08:03 3740115 
  /usr/lib64/libsqlite3.so.0.8.6
39bf400000-39bf415000 r-xp 00000000 08:03 12320771 
  /lib64/libpthread-2.5.so
..............

Or:

*** glibc detected *** /usr/local/apache2/bin/httpd: double free or 
corruption (!prev): 0x0000000012bba950 ***

followed by the same dump

After this the apache crash. Before this to happen there is nothing 
strange to see on the system like heavy load or huge number of requests.
Have anybody see something similar?
Thanks
alex

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