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Bug #56858 Segfault & Floating point exception
Submitted: 2006-02-25 06:28 UTC Modified: 2006-08-30 00:54 UTC
From: m dot wanat at forall dot pl Assigned:
Status: Not a bug Package: APC (PECL)
PHP Version: 5.1.2 OS: SuSE 10.0 64bit
Private report: No CVE-ID: None
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 [2006-02-25 06:28 UTC] m dot wanat at forall dot pl 
Description:
------------
I tried to run APC (downloaded from CVS 30minutes ago)
Compiled with:
CFLAGS="-O3 -march=athlon64 -ffast-math -funroll-all-loops -funit-at-a-time -fpeel-loops -ftracer -funswitch-loops -fomit-frame-pointer -pipe"
and:
CFLAGS="-O2"

always getting hunderts logs i erros_log:

[Sat Feb 25 12:17:39 2006] [notice] child pid 25298 exit signal Segmentation fault (11)
[Sat Feb 25 12:17:39 2006] [notice] child pid 25410 exit signal Segmentation fault (11)
[Sat Feb 25 12:17:39 2006] [notice] child pid 25440 exit signal Floating point exception (8)
[Sat Feb 25 12:17:39 2006] [notice] child pid 25442 exit signal Floating point exception (8)
[Sat Feb 25 12:17:39 2006] [notice] child pid 25496 exit signal Floating point exception (8)
[Sat Feb 25 12:17:40 2006] [notice] child pid 25526 exit signal Segmentation fault (11)

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 [2006-02-25 10:22 UTC] rasmus@php.net 
Can you get me a backtrace of one of these crashes?
 [2006-04-09 09:45 UTC] m dot wanat at forall dot pl 
http://85.10.218.100/a

Here is full backtrace made from coredump of crashed server with error: "child pid 25410 exit signal
Segmentation fault (11)"

I am ussing CVS(09.04.2006) version  of APC

I am using apache 2.2.0 on SuSE 10.064bit with Athlon64

I was trying MPM: event and worker with the same result.
 [2006-04-09 12:12 UTC] rasmus@php.net 
Does it happen with the prefork mpm?  If so, please get a backtrace from that and compile without any optimization, not even -O2 to give me a readable backtrace.
 [2006-04-10 11:10 UTC] m dot wanat at forall dot pl 
Prefork gives me such errors:

#0  ZEND_UNSET_VAR_SPEC_CV_HANDLER (execute_data=0x7fffff819900)
    at zend_hash.h:252
#1  0x00002b8a8c36994b in execute (op_array=0x58d74a0) at zend_vm_execute.h:92
#2  0x00002b8a8c36eb99 in ZEND_INCLUDE_OR_EVAL_SPEC_CONST_HANDLER (
    execute_data=0x7fffff81b460) at zend_vm_execute.h:1918
#3  0x00002b8a8c3698fb in execute (op_array=0x58c9f70) at zend_vm_execute.h:92
#4  0x00002b8a8c341386 in zend_execute_scripts (type=8,
    retval=<value optimized out>, file_count=3)
    at /root/php-5.1.2/Zend/zend.c:1101
#5  0x00002b8a8c2f0e43 in php_execute_script (primary_file=0x7fffff81da10)
    at /root/php-5.1.2/main/main.c:1721
#6  0x00002b8a8c3fc215 in php_handler (r=0x58a40c8)
    at /root/php-5.1.2/sapi/apache2handler/sapi_apache2.c:584
#7  0x000000000043bb7d in ap_invoke_handler (r=0x58a40c8) at config.c:157
#8  0x000000000045d790 in ap_process_request (r=0x58a40c8)
    at http_request.c:258
#9  0x0000000000459a19 in ap_process_http_connection (c=0x589e288)
    at http_core.c:171
#10 0x000000000044280c in ap_process_connection (c=0x589e288, csd=0x589e098)
    at connection.c:43
#11 0x00000000004805c7 in child_main (child_num_arg=<value optimized out>)
    at prefork.c:640
#12 0x0000000000480944 in make_child (s=0x5cafe8, slot=2) at prefork.c:736
---Type <return> to continue, or q <return> to quit---
#13 0x00000000004817d5 in ap_mpm_run (_pconf=<value optimized out>,
    plog=<value optimized out>, s=<value optimized out>) at prefork.c:871
#14 0x0000000000421020 in main (argc=3, argv=0x7fffff81df18) at main.c:712


Full backtrace is available here:
http://85.10.218.99/a
 [2006-04-10 11:40 UTC] m dot wanat at forall dot pl 
Sorry, I used -O3. I am now recompiling without any optimization and will provide backtrace within 10 minutes.
 [2006-04-10 11:58 UTC] m dot wanat at forall dot pl 
It's quite funny, but httpd 2.2 prefork compiled witth CFLAGS="" + PHP5.1.2 with CFLAGS="" + APC(current cvs) works fine and have no crashes :)
 [2006-05-15 18:46 UTC] gopalv82 at yahoo dot com 
How many strict aliasing errors do you get during the entire build ?

Also you might want to build it using -fno-strict-alias and -fno-gcse to confirm whether it is a hazard in instruction scheduling.
 [2006-08-30 00:54 UTC] gopalv82 at yahoo dot com 
Closed as bogus (gcc optimization issue)
 
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