Bug #79646 [Com]: Segmentation fault in garbage collector

From:	enumag at gmail dot com	Date:	Tue, 23 Jun 2020 13:01:18 +0000
Subject:	Bug #79646 [Com]: Segmentation fault in garbage collector
References:	1	Groups:	php.bugs
Request:	Send a blank email to php-bugs+get-227606@lists.php.net to get a copy of this message

Edit report at https://bugs.php.net/bug.php?id=79646&edit=1

 ID:                 79646
 Comment by:         enumag at gmail dot com
 Reported by:        enumag at gmail dot com
 Summary:            Segmentation fault in garbage collector
 Status:             Open
 Type:               Bug
 Package:            Scripting Engine problem
 Operating System:   Alpine
 PHP Version:        7.4.7
 Block user comment: N
 Private report:     N

 New Comment:

Any news on this one @nikic?


Previous Comments:
------------------------------------------------------------------------
[2020-06-15 12:57:15] enumag at gmail dot com

@nikic Alright, here is another log with no error limit:
https://gist.github.com/enumag/a5bbfbb0cfe606b77148e8b83dfd4d41

------------------------------------------------------------------------
[2020-06-15 12:43:32] nikic@php.net

@enumag: Thanks! From the new trace it seems clear that those "Invalid read of size 16"
are false positives. They are probably caused by a vectorized implementation of some string function
intentionally reading past the end of strings in a way that it knows is safe.

Unfortunately that also means that the trace ends before it gets to anything useful. Valgrind
suggests using --error-limit=no to avoid that.

------------------------------------------------------------------------
[2020-06-15 12:31:31] enumag at gmail dot com

The command I used this time:
USE_ZEND_ALLOC=0 valgrind --tool=memcheck --num-callers=30 --log-file=valgrind.txt
--suppressions=php.supp php vendor/bin/phpunit

------------------------------------------------------------------------
[2020-06-15 12:30:45] enumag at gmail dot com

@nikic Check this one please.
https://gist.github.com/enumag/329cbe88c5e77c5cc5be74aafa330ba8

------------------------------------------------------------------------
[2020-06-15 09:15:18] enumag at gmail dot com

I can use https://github.com/wodby/base-php docker
image for that. Did it before to get the gdb stacktrace. Let me try...

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


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Thread (21 messages)

• enumag at gmail dot comThu, 28 May 2020 08:36:38 +0000
  • bwoebi@php.netThu, 28 May 2020 08:46:32 +0000Bug #79646 [Opn]: Segmentation fault in garbage collector
  • enumag at gmail dot comThu, 28 May 2020 09:01:20 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • alexinbeijing at gmail dot comMon, 08 Jun 2020 20:19:29 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • enumag at gmail dot comThu, 11 Jun 2020 07:08:56 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • enumag at gmail dot comThu, 11 Jun 2020 09:09:19 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • enumag at gmail dot comMon, 15 Jun 2020 06:59:53 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • nikic@php.netMon, 15 Jun 2020 07:47:41 +0000Bug #79646 [Opn]: Segmentation fault in garbage collector
  • enumag at gmail dot comMon, 15 Jun 2020 09:00:40 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • nikic@php.netMon, 15 Jun 2020 09:04:52 +0000Bug #79646 [Opn]: Segmentation fault in garbage collector
  • enumag at gmail dot comMon, 15 Jun 2020 09:15:18 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • enumag at gmail dot comMon, 15 Jun 2020 12:30:45 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • enumag at gmail dot comMon, 15 Jun 2020 12:31:31 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • nikic@php.netMon, 15 Jun 2020 12:43:33 +0000Bug #79646 [Opn]: Segmentation fault in garbage collector
  • enumag at gmail dot comMon, 15 Jun 2020 12:57:15 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • enumag at gmail dot comTue, 23 Jun 2020 13:01:18 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • enumag at gmail dot comTue, 15 Sep 2020 13:55:42 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • aa dot vasilenko at gmail dot comThu, 22 Oct 2020 16:36:28 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • nikic@php.netWed, 18 Nov 2020 15:02:54 +0000Bug #79646 [Opn]: Segmentation fault in garbage collector
  • enumag at gmail dot comWed, 18 Nov 2020 15:47:11 +0000Bug #79646 [Com]: Segmentation fault in garbage collector
  • nikic@php.netWed, 18 Nov 2020 17:09:15 +0000Bug #79646 [Opn]: Segmentation fault in garbage collector