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Bug #79813 Assertion `p->refcount > 0' failed.
Submitted: 2020-07-09 04:27 UTC Modified: 2020-07-10 08:09 UTC
Votes:2
Avg. Score:3.5 ± 0.5
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: changochen1 at gmail dot com Assigned:
Status: Verified Package: Scripting Engine problem
PHP Version: 7.4 OS:
Private report: No CVE-ID: None
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 [2020-07-09 04:27 UTC] changochen1 at gmail dot com 
Description:
------------
LOG:
---
php: /home/yongheng/php_clean/Zend/zend_types.h:1162: uint32_t zend_gc_delref(zend_refcounted_h *): Assertion `p->refcount > 0' failed.
---

Run with `php -f poc.php >/dev/null`

Test script:
---------------
<?
foreach ( new InfiniteIterator ( new ArrayIterator ( [ [] ] ) ) as $a )
    $c[] = array ( $b.= 1)  ;

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 [2020-07-09 07:25 UTC] cmb@php.net
-Status: Open +Status: Verified -PHP Version: 8.0Git-2020-07-09 (Git) +PHP Version: 7.4
 [2020-07-09 15:34 UTC] changochen1 at gmail dot com 
Hi, I wonder why the version info changed, as I tested it on the master brach of version 8.0/
 [2020-07-10 08:09 UTC] cmb@php.net 
Because that assertion fails on PHP 7.4 as well.
 [2020-12-22 19:00 UTC] enumag at gmail dot com 
PHP version: 7.4.13


This just popped up randomly in my CI:

```
Assertion failed: p->refcount > 0 (/usr/src/php/Zend/zend_types.h: zend_gc_delref: 1039)
Aborted (core dumped)
```

I have a gdb backtrace from the core but it's most likely not very useful...

```
Reading symbols from /usr/local/bin/php...
warning: Can't read pathname for load map: No error information.
[New LWP 156]
Core was generated by `php vendor/bin/phpunit --colors=always --exclude-group ignore'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f62b9245a71 in setjmp () from /lib/ld-musl-x86_64.so.1
#0  0x00007f62b9245a71 in setjmp () from /lib/ld-musl-x86_64.so.1
#1  0x00007f62b9245bcc in raise () from /lib/ld-musl-x86_64.so.1
#2  0x0000003000000010 in ?? ()
#3  0x00007ffd7d4a7c10 in ?? ()
#4  0x00007ffd7d4a7b50 in ?? ()
#5  0x0000563b9a3428c0 in ?? ()
#6  0x0000563b9a346380 in ?? ()
#7  0x0000563b9857a9b7 in ?? ()
#8  0x0000563b9857a998 in ?? ()
#9  0x0000563b9857ab90 in ?? ()
#10 0x000000000000040f in ?? ()
#11 0x00000000000000c0 in ?? ()
#12 0x00007f62ab3d44e8 in ?? ()
#13 0x0000563b9a3462e0 in ?? ()
#14 0x0000563b9a346360 in ?? ()
#15 0x00007ffd7d4a7bd0 in ?? ()
#16 0x00007ffd7d4a7c5c in ?? ()
#17 0x00007ffd7d4a7c70 in ?? ()
#18 0x0000563b9a4f8ca0 in ?? ()
#19 0x00007ffd7d4a7c30 in ?? ()
#20 0x00007f62b921d713 in abort () from /lib/ld-musl-x86_64.so.1
#21 0x0000563b9a4f8ca0 in ?? ()
#22 0x00007f62b92494be in ?? () from /lib/ld-musl-x86_64.so.1
#23 0x0000000000000000 in ?? ()
```
 [2020-12-30 10:27 UTC] enumag at gmail dot com 
I tried to narrow down when this bug appeared. From my testing PHP 7.4.9 is fine and 7.4.10+ has this problem.
 [2021-01-14 08:17 UTC] enumag at gmail dot com 
Ignore my last comment. PHP 7.4.9 also has the problem.
 
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