https://bz.apache.org/bugzilla/show_bug.cgi?id=61498
Bug ID: 61498
Summary: Buffer overflow detected when over 1024 file
descriptor
Product: Apache httpd-2
Version: 2.4.6
Hardware: PC
OS: Linux
Status: NEW
Severity: major
Priority: P2
Component: All
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
I have 2.4.6-45.el7.centos.4 on Centos 7.
I have hundreds of virtual hosts with ErrorLog for all of them.
When I count how many file descriptor my httpd process is using
(/proc/xxxx/fd), if it's over 1024, Apache generates a Buffer Overflow :
*** buffer overflow detected ***: /usr/sbin/httpd terminated
======= Backtrace: =========
/lib64/libc.so.6(__fortify_fail+0x37)[0x7fb23a6ee077]
/lib64/libc.so.6(+0x10d230)[0x7fb23a6ec230]
/lib64/libc.so.6(+0x10efe7)[0x7fb23a6edfe7]
/usr/lib64/php/modules/memcache.so(mmc_pool_select+0x4b9)[0x7fb2228ab2f9]
/usr/lib64/php/modules/memcache.so(mmc_pool_run+0x68)[0x7fb2228abb38]
/usr/lib64/php/modules/memcache.so(zif_memcache_get+0x18f)[0x7fb2228a501f]
/etc/httpd/modules/libphp5.so(+0x2f06c1)[0x7fb22da966c1]
/etc/httpd/modules/libphp5.so(execute_ex+0x38)[0x7fb22da2a788]
/etc/httpd/modules/libphp5.so(zend_execute_scripts+0x18b)[0x7fb22d9ef06b]
/etc/httpd/modules/libphp5.so(php_execute_script+0x282)[0x7fb22d989d22]
/etc/httpd/modules/libphp5.so(+0x2f20ad)[0x7fb22da980ad]
/usr/sbin/httpd(ap_run_handler+0x40)[0x7fb23c123690]
/usr/sbin/httpd(ap_invoke_handler+0x69)[0x7fb23c123bd9]
/usr/sbin/httpd(ap_internal_redirect+0x5c)[0x7fb23c137acc]
/etc/httpd/modules/mod_rewrite.so(+0x4e9c)[0x7fb2348d7e9c]
/usr/sbin/httpd(ap_run_handler+0x40)[0x7fb23c123690]
/usr/sbin/httpd(ap_invoke_handler+0x69)[0x7fb23c123bd9]
/usr/sbin/httpd(ap_process_async_request+0x20a)[0x7fb23c13800a]
/usr/sbin/httpd(ap_process_request+0x14)[0x7fb23c1382e4]
/usr/sbin/httpd(+0x52c32)[0x7fb23c134c32]
/usr/sbin/httpd(ap_run_process_connection+0x40)[0x7fb23c12cc90]
/etc/httpd/modules/mod_mpm_prefork.so(+0x380f)[0x7fb231d2080f]
/etc/httpd/modules/mod_mpm_prefork.so(+0x3a55)[0x7fb231d20a55]
/etc/httpd/modules/mod_mpm_prefork.so(+0x46ee)[0x7fb231d216ee]
/usr/sbin/httpd(ap_run_mpm+0x4e)[0x7fb23c107f6e]
/usr/sbin/httpd(main+0xa86)[0x7fb23c100d76]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7fb23a600b35]
/usr/sbin/httpd(+0x1eeaf)[0x7fb23c100eaf]
If I disable a few virtual hosts to get below that threshold, it's starting up.
I confirmed that my limits are ok :
cat /proc/xxxxx/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 256005 256005 processes
Max open files 30000 30000 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 256005 256005 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
I had to add this, otherwise I was having a too many open file :
/etc/systemd/system/httpd.service.d/limits.conf
[Service]
LimitNOFILE=30000
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