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Bug #56509 More than one SHM segment crashes Apache
Submitted: 2005-08-24 06:55 UTC Modified: 2005-08-24 09:40 UTC
From: forke at forke dot info Assigned:
Status: Suspended Package: APC (PECL)
PHP Version: 4.3.10 OS: Linux/SuSE 9.2
Private report: No CVE-ID: None
View Developer Edit
 [2005-08-24 06:55 UTC] forke at forke dot info 
Description:
------------
Apache-leader crashes if set more that 1 SHM segments

Reproduce code:
---------------
Server Version: Apache/2.0.54 (Unix) PHP/4.4.0 MPM: leader

APC configure options:
export CPPFLAGS="-I/usr/local/httpd-leader/include/ -DAPC_PHP4_STAT"

./configure --enable-apc --enable-apc-mmap --with-apxs=/usr/local/httpd-leader/bin/apxs --with-php-config=/usr/bin/php-config

php.ini:
extension="apc.so"
apc.num_files_hint=10000
apc.optimization=1
apc.ttl=300
apc.shm_size=32
apc.shm_segments=2
apc.mmap_file_mask=/tmp/apc.XXXXXX


Expected result:
----------------
Two 32MB SHM segments in APC cache.

Actual result:
--------------
Apache crash:
[Wed Aug 24 12:35:40 2005] [apc-error] apc_mmap: mkstemp on /tmp/apc/apc.XJ3pgc failed: Invalid argument

If apc.mmap_file_mask is set to: "" then APC start with only one SHM segment despite apc.shm_segments value.

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 [2005-08-24 09:40 UTC] rasmus@php.net 
Right, so don't do that.  It makes no sense to have multiple mmap'ed segments since there is no segment size limit.  I will eventually get around to removing the multi-segment limit.
 
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