Bug #71958 [Opn->Fbk]: Segmentation fault in garbage collector

From: Date: Thu, 14 Jul 2016 09:27:25 +0000
Subject: Bug #71958 [Opn->Fbk]: Segmentation fault in garbage collector
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-202301@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=71958&edit=1

 ID:                 71958
 Updated by:         dmitry@php.net
 Reported by:        edefimov dot it at gmail dot com
 Summary:            Segmentation fault in garbage collector
-Status:             Open
+Status:             Feedback
 Type:               Bug
 Package:            Unknown/Other Function
 Operating System:   Debian 3.16.7
 PHP Version:        5.5.34
 Block user comment: N
 Private report:     N

 New Comment:

We can't fix GC problem without a reproducible case.


Previous Comments:
------------------------------------------------------------------------
[2016-04-04 17:11:32] edefimov dot it at gmail dot com

Description:
------------
I have a segmentation fault during execution of gc_collect_cycles() in production code. The bug
appears randomly, some requests are successful. There is a dump file with this error. The file
itself can not be shared as it contains sensitive data, but we can provide some information from it.

Actual result:
--------------
dbg trace fragment:
Program terminated with signal 11, Segmentation fault.
#0  zval_scan_black (pz=0x3417d1000) at /usr/src/builddir/Zend/zend_gc.c:289
289	/usr/src/builddir/Zend/zend_gc.c: No such file or directory.

#0  zval_scan_black (pz=0x3417d1000) at /usr/src/builddir/Zend/zend_gc.c:289
#1  0x000000000070e3bd in zval_scan_black (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:321
#2  0x000000000070e40f in zval_scan_black (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:296
#3  0x000000000070e40f in zval_scan_black (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:296
#4  0x000000000070e40f in zval_scan_black (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:296
#5  0x000000000070e3bd in zval_scan_black (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:321
#6  0x000000000070e40f in zval_scan_black (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:296
#7  0x000000000070e40f in zval_scan_black (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:296
#8  0x000000000070e3bd in zval_scan_black (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:321
#9  0x000000000070e7e5 in zval_scan (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:514
#10 0x000000000070ed9c in zobj_scan (pz=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:600
#11 gc_scan_roots () at /usr/src/builddir/Zend/zend_gc.c:620
#12 gc_collect_cycles () at /usr/src/builddir/Zend/zend_gc.c:791
#13 0x000000000070f392 in gc_zval_possible_root (zv=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.c:163
#14 0x0000000000798fbf in gc_zval_check_possible_root (z=<optimized out>) at
/usr/src/builddir/Zend/zend_gc.h:183
#15 zend_pzval_unlock_func (unref=1, should_free=<synthetic pointer>, z=<optimized out>)
at /usr/src/builddir/Zend/zend_execute.c:82


------------------------------------------------------------------------



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