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Bug #78713 segfaults with opcache.preload
Submitted: 2019-10-21 14:08 UTC Modified: 2019-10-22 14:59 UTC
From: remi@php.net Assigned: dmitry (profile)
Status: Closed Package: opcache
PHP Version: 7.4.0RC4 OS:
Private report: No CVE-ID: None
View Developer Edit
 [2019-10-21 14:08 UTC] remi@php.net 
Description:
------------
Using opcache.preload + opcache.preload_user=apache


(gdb) bt
#0  0x00007ffff657b974 in __memset_sse2 () from /lib64/libc.so.6
#1  0x00007fffe74b1980 in php_request_startup () at /usr/src/debug/php-7.4.0RC4/main/main.c:1798
#2  0x00007fffe759b7ea in php_apache_request_ctor (r=r@entry=0x555556c926d0, ctx=<optimized out>) at /usr/src/debug/php-7.4.0RC4/sapi/apache2handler/sapi_apache2.c:537
#3  0x00007fffe759bf63 in php_handler () at /usr/src/debug/php-7.4.0RC4/sapi/apache2handler/sapi_apache2.c:655
#4  0x0000555555595af0 in ap_run_handler ()
#5  0x0000555555596039 in ap_invoke_handler ()
#6  0x00005555555aac4a in ap_process_async_request ()
#7  0x00005555555aaf32 in ap_process_request ()
#8  0x00005555555a70c2 in ap_process_http_connection ()
#9  0x000055555559f120 in ap_run_process_connection ()
#10 0x00007fffedc317af in child_main () from /etc/httpd/modules/mod_mpm_prefork.so
#11 0x00007fffedc319ac in make_child () from /etc/httpd/modules/mod_mpm_prefork.so
#12 0x00007fffedc32731 in prefork_run () from /etc/httpd/modules/mod_mpm_prefork.so
#13 0x000055555557a0ce in ap_run_mpm ()
#14 0x0000555555572e26 in main ()

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 [2019-10-21 14:28 UTC] remi@php.net
-Summary: mod_php segfaults with opcache.preload +Summary: segfaults with opcache.preload
 [2019-10-21 14:30 UTC] remi@php.net 
Not related to mod_php, same segfault with CLI

Could be related to (old) libffi 3.0.13 on RHEL / CentOS 7
 [2019-10-22 06:34 UTC] remi@php.net 
Sorry for previous comment

segfault happens everywhere (RHEL 7, Centos 8, Fedora...) as soon as trying to preload a class using FFI as root.
 [2019-10-22 11:20 UTC] dmitry@php.net
-Status: Open +Status: Assigned -Assigned To: +Assigned To: dmitry
 [2019-10-22 11:20 UTC] dmitry@php.net 
This may be fixed using ffi.preload directive

https://github.com/php/php-src/pull/4842
 [2019-10-22 14:59 UTC] dmitry@php.net
-Status: Assigned +Status: Closed
 [2019-10-22 14:59 UTC] dmitry@php.net 
Fixed by https://github.com/php/php-src/commit/1417352dda354c22db43a8d4dbaa967575e2720c
 
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