Edit report at https://bugs.php.net/bug.php?id=70392&edit=1
ID: 70392
Comment by: pegasus at vaultwiki dot org
Reported by: pegasus at vaultwiki dot org
Summary: SIGSEGV during PHP shutdown
Status: Feedback
Type: Bug
Package: *General Issues
Operating System: Centos 7 64-bit
PHP Version: 7.0Git-2015-08-30 (Git)
Assigned To: dmitry
Block user comment: N
Private report: N
New Comment:
After a few days, issue persists using the suggested commit (different line numbers):
###
#0 0x000000000094733b in zend_mm_find_leaks_small (p=0x7f7df2200000, i=510,
j=6, leak=0x7fffbe955cf0)
at /home/***/php-src-0f74bae/Zend/zend_alloc.c:1966
1966 if (dbg->size != 0) {
###
p dbg
$1 = (zend_mm_debug_info *) 0x7f7df24002e0
p bin_num
$2 = 24
p dbg->size
Cannot access memory at address 0x7f7df24002e0
p leak->filename
$3 = 0xfe5540 "/home/***/php-src-0f74bae/Zend/zend_vm_execute.h"
p leak->lineno
$4 = 15242
I have not checked exhaustively, but when comparing to other instances of the error, it seems
bin_num = 24 is a pattern here (and dbg->size is always inaccessible).
Previous Comments:
------------------------------------------------------------------------
[2015-09-02 12:16:57] pegasus at vaultwiki dot org
I will try the new commit and watch the logs for a few days to see if the error still occurs. I will
also work on getting you the output of those variables next time I am at the terminal.
------------------------------------------------------------------------
[2015-09-02 10:09:18] dmitry@php.net
Please check the latest git version.
The following commit might fix the problem.
http://git.php.net/?p=php-src.git;a=commitdiff;h=111bd5d8c45a9c44b2e39951e6a1a543a893f8bd
------------------------------------------------------------------------
[2015-09-01 17:27:25] dmitry@php.net
p dbg
p bin_num
------------------------------------------------------------------------
[2015-08-31 18:09:06] pegasus at vaultwiki dot org
How would I output the value?
------------------------------------------------------------------------
[2015-08-31 16:30:35] dmitry@php.net
The crash on line "if (dbg->size != 0)" is possible only when "dbg" is
invalid.
The crash occured on processing 25-th element of 510-th page.
We allocate 512 pages at once. So I assume "dbg" somehow points into page after 512.
I don't see how this may happen yet.
Can you show the values of "dbg" and "bin_num"?
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