Edit report at https://bugs.php.net/bug.php?id=77312&edit=1
ID: 77312
Updated by: nikic@php.net
Reported by: sjon at hortensius dot net
Summary: accel_replace_string_by_process_permanent: Assertion
`0' failed
-Status: Assigned
+Status: Re-Opened
Type: Bug
Package: opcache
Operating System: archlinux
PHP Version: 7.3.1
Block user comment: N
Private report: N
New Comment:
https://github.com/php/php-src/blob/PHP-7.3.1/ext/opcache/ZendAccelerator.c#L689
Failing to replace value of an ini directive.
In your core dump, can you please "f 2" and "p (char*)entry->key->val" and
"p (char*)entry->value->val"? That should narrow down where this is happening.
Previous Comments:
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[2019-01-15 12:08:47] sjon at hortensius dot net
Turns out FPM needed process.dumpable=true set as well to actually generate a coredump. Here is the
backtrace after replacing the assert with a segfault:
#0 accel_replace_string_by_process_permanent (str=0x56100556b3c0) at
ext/opcache/ZendAccelerator.c:737
#1 0x00007f2c06511144 in accel_copy_permanent_strings (new_interned_string=0x7f2c06511431
<accel_replace_string_by_process_permanent>) at ext/opcache/ZendAccelerator.c:689
#2 0x00007f2c06511540 in accel_use_permanent_interned_strings () at
ext/opcache/ZendAccelerator.c:765
#3 0x00005610031b7bff in zend_interned_strings_switch_storage (request=0 '\000') at
Zend/zend_string.c:322
#4 0x00005610030e0d1f in php_module_shutdown () at main/main.c:2473
#5 0x0000561003268912 in main (argc=4, argv=0x7ffdd655b968) at sapi/fpm/fpm/fpm_main.c:2004
This happens pretty frequently
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[2019-01-11 09:03:04] sjon at hortensius dot net
@lauri thanks for the hint - I already did that and was still unsuccessful. I'm happy to see if
it still happens in 7.3.1 and reopen this bug if it does
------------------------------------------------------------------------
[2019-01-10 18:06:28] lauri dot kentta at gmail dot com
@sjon, GDB detaches from forked processes by default. You can use "set follow-fork-mode
child" or "set detach-on-fork off" to debug the php-fpm child processes.
Also, just saying: since this bug was basically about a string not being found, it could have been
the one I mentioned (which caused memory corruption and sometimes invalid string values). But no
matter.
------------------------------------------------------------------------
[2019-01-10 12:01:30] sjon at hortensius dot net
This seems to be fixed in 7.3.1 - and while it happens frequently I cannot seem to obtain a coredump
or get gdb to catch it - closing for now
------------------------------------------------------------------------
[2019-01-09 09:05:58] nikic@php.net
Could you please provide a backtrace for the assertion failure? That way we'd know which string
it is trying to replace.
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