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I'm getting a segmentation fault running a script using a custom PHP 8.1.9 compiled with phpbrew tool.

I've executed gdb and trying to debug the segmentation fault but I'm not sure of the next step I should take.

Here's the result

/var/www/vhosts/example.com/httpdocs$ gdb -args /opt/phpbrew/php/phpbrew8_1_9_fdev/bin/php -c .user.ini -dmemory_limit=4G bin/magento command:feed:generate default
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Reading symbols from /opt/phpbrew/php/phpbrew8_1_9_fdev/bin/php...
(gdb) run
Starting program: /opt/phpbrew/php/phpbrew8_1_9_fdev/bin/php -c .user.ini -dmemory_limit=4G bin/magento command:feed:generate default
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Xdebug: [Config] The setting 'xdebug.remote_enable' has been renamed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-xdebug.remote_enable (See: https://xdebug.org/docs/errors#CFG-C-CHANGED)
Xdebug: [Config] The setting 'xdebug.remote_host' has been renamed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-xdebug.remote_host (See: https://xdebug.org/docs/errors#CFG-C-CHANGED)
Xdebug: [Config] The setting 'xdebug.remote_port' has been renamed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-xdebug.remote_port (See: https://xdebug.org/docs/errors#CFG-C-CHANGED)
Lock Acquired
Processing...
Fetchings product in included categories
Fetching products in excluded categories
Fetching products data

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff737dfdb in __strstr_sse2 (haystack=0x7fffeda2c8a0 "Vendor\\Module\\Helper\\Data", needle=0x7ffff4692b39 "@anonymous") at ../string/strstr.c:84
84      ../string/strstr.c: No such file or directory.

The output of where

#0  0x00007ffff737dfdb in __strstr_sse2 (haystack=0x7fffeea2de88 "Vendor\\Module\\Helper\\Data", needle=0x7ffff4692b39 "@anonymous") at ../string/strstr.c:84
#1  0x00007ffff466438e in xdebug_build_fname (tmp=tmp@entry=0x7fffe9db2b20, edata=edata@entry=0x7fffea46f120) at /opt/phpbrew/build/phpbrew8_1_9_fdev/ext/xdebug/src/base/base.c:218
#2  0x00007ffff46647ca in xdebug_add_stack_frame (zdata=<optimized out>, zdata@entry=0x7fffea46f070, op_array=op_array@entry=0x7fffeb955ae0, type=type@entry=1)
    at /opt/phpbrew/build/phpbrew8_1_9_fdev/ext/xdebug/src/base/base.c:615
#3  0x00007ffff4664f88 in xdebug_execute_ex (execute_data=0x7fffea46f120) at /opt/phpbrew/build/phpbrew8_1_9_fdev/ext/xdebug/src/base/base.c:721
#4  0x0000555555b2f24d in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER () at /opt/phpbrew/build/phpbrew8_1_9_fdev/Zend/zend_vm_execute.h:1837
#5  execute_ex (ex=0x7fffeea2de88) at /opt/phpbrew/build/phpbrew8_1_9_fdev/Zend/zend_vm_execute.h:55788
#6  0x00007ffff4665092 in xdebug_execute_ex (execute_data=0x7fffea46f070) at /opt/phpbrew/build/phpbrew8_1_9_fdev/ext/xdebug/src/base/base.c:779
#7  0x0000555555b2f24d in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER () at /opt/phpbrew/build/phpbrew8_1_9_fdev/Zend/zend_vm_execute.h:1837
#8  execute_ex (ex=0x7fffeea2de88) at /opt/phpbrew/build/phpbrew8_1_9_fdev/Zend/zend_vm_execute.h:55788
#9  0x00007ffff4665092 in xdebug_execute_ex (execute_data=0x7fffea46efc0) at /opt/phpbrew/build/phpbrew8_1_9_fdev/ext/xdebug/src/base/base.c:779
#10 0x0000555555b2f24d in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER () at /opt/phpbrew/build/phpbrew8_1_9_fdev/Zend/zend_vm_execute.h:1837
#11 execute_ex (ex=0x7fffeea2de88) at /opt/phpbrew/build/phpbrew8_1_9_fdev/Zend/zend_vm_execute.h:55788
#12 0x00007ffff4665092 in xdebug_execute_ex (execute_data=0x7fffea46ef10) at /opt/phpbrew/build/phpbrew8_1_9_fdev/ext/xdebug/src/base/base.c:779
#13 0x0000555555b2f24d in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER () at /opt/phpbrew/build/phpbrew8_1_9_fdev/Zend/zend_vm_execute.h:1837
#14 execute_ex (ex=0x7fffeea2de88) at /opt/phpbrew/build/phpbrew8_1_9_fdev/Zend/zend_vm_execute.h:55788
#15 0x00007ffff4665092 in xdebug_execute_ex

These lines keep repeating endlessly for more than a few minutes when I type c to continue without paging.

gabtzi
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  • Please update your question with the the output of GDB `where` command (after you've got `SIGSEGV`). – Employed Russian Sep 18 '22 at 05:06
  • It looks like a loop of the same output – gabtzi Sep 18 '22 at 07:10
  • I found the issue by step debugging the code, it was a recursive function which would never exit. – gabtzi Sep 18 '22 at 11:09
  • "recursive function which would never exit" -- so you have stack overflow -- as I suspected. It's a bug in PHP, but that's all I can say. You said "custom PHP" -- perhaps the customization introduced the bug? – Employed Russian Sep 18 '22 at 15:24
  • Perhaps custom was the wrong word. I meant compiled using a tool called phpbrew with a specific set of extensions. I can't be sure if it was a bug introduced by phpbrew though. – gabtzi Sep 19 '22 at 16:03

0 Answers0