PHP :: Bug #74632 :: Segmentation fault on php_request

Bug #74632

Segmentation fault on php_request_shutdown

Submitted:

2017-05-22 14:01 UTC

Modified:

2017-11-02 20:26 UTC

Votes:	2
Avg. Score:	4.5 ± 0.5
Reproduced:	2 of 2 (100.0%)
Same Version:	2 (100.0%)
Same OS:	0 (0.0%)

From:

adam dot rosadzinski at home dot net dot pl

Assigned:

nikic (profile)

Status:

Closed

Package:

Reproducible crash

PHP Version:

5.6.30

OS:

Arch Linux, kernel 4.0.6 x86_64

Private report:

CVE-ID:

None

View Developer Edit

Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.

Password:

Status:
Package:
Bug Type:
Summary:
From:	adam dot rosadzinski at home dot net dot pl
New email:
PHP Version:		OS:

New Comment:

[2017-05-22 14:01 UTC] adam dot rosadzinski at home dot net dot pl

Description:
------------
PHP version: 5.6.30
Configure line: ./configure --disable-rpath --with-layout=GNU --with-pic --enable-static=no --prefix=/usr --with-pear=/usr/lib/pear --datarootdir=/usr/share --with-config-file-path=/usr/etc --with-config-file-scan-dir=/usr/etc/conf.d

I'd like to report possible bug in Zend MM, which causes crash on request shutdown.
This issue is easily reproducible if you try to allocate more memory than specified in memory_limit directive.

Tested also on Mac OS X 10.12.4 (Sierra) with same result.

Test script:
---------------
<?php
error_reporting(E_ALL);
ini_set('display_errors', 0);
ini_set('memory_limit', '512M');

for($x=0;$x<100000000;$x++)
        $array[$x]=$x;

?>

Expected result:
----------------
No output on stdout
Script exited with code 0

Actual result:
--------------
Output on stdout: Segmentation fault
Script exited with code 139

Valgrind output:
==28140== Invalid read of size 4
==28140==    at 0xA8C634: zval_delref_p (zend.h:411)
==28140==    by 0xA8C634: i_zval_ptr_dtor (zend_execute.h:76)
==28140==    by 0xA8C634: _zval_ptr_dtor (zend_execute_API.c:424)
==28140==    by 0xAAFB4F: i_zend_hash_bucket_delete (zend_hash.c:182)
==28140==    by 0xAAFB4F: zend_hash_bucket_delete (zend_hash.c:192)
==28140==    by 0xAAFB4F: zend_hash_graceful_reverse_destroy (zend_hash.c:613)
==28140==    by 0xA8CC55: shutdown_executor (zend_execute_API.c:244)
==28140==    by 0xA9EE55: zend_deactivate (zend.c:960)
==28140==    by 0xA2EB6F: php_request_shutdown (main.c:1899)
==28140==    by 0xB5807E: do_cli (php_cli.c:1181)
==28140==    by 0x463542: main (php_cli.c:1382)
==28140==  Address 0x2a1ec220 is 261,984 bytes inside a block of size 262,144 free'd
==28140==    at 0x4C2C14B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==28140==    by 0xA71740: zend_mm_del_segment (zend_alloc.c:928)
==28140==    by 0xA71740: _zend_mm_free_int (zend_alloc.c:2115)
==28140==    by 0xA71740: _efree (zend_alloc.c:2440)
==28140==    by 0xAAF7FD: zend_hash_destroy (zend_hash.c:553)
==28140==    by 0xA9DD8A: _zval_dtor_func (zend_variables.c:45)
==28140==    by 0xA8C67F: _zval_dtor (zend_variables.h:35)
==28140==    by 0xA8C67F: i_zval_ptr_dtor (zend_execute.h:79)
==28140==    by 0xA8C67F: _zval_ptr_dtor (zend_execute_API.c:424)
==28140==    by 0xAAFB4F: i_zend_hash_bucket_delete (zend_hash.c:182)
==28140==    by 0xAAFB4F: zend_hash_bucket_delete (zend_hash.c:192)
==28140==    by 0xAAFB4F: zend_hash_graceful_reverse_destroy (zend_hash.c:613)
==28140==    by 0xA8CC55: shutdown_executor (zend_execute_API.c:244)
==28140==    by 0xA9EE55: zend_deactivate (zend.c:960)
==28140==    by 0xA2EB6F: php_request_shutdown (main.c:1899)
==28140==    by 0xB5807E: do_cli (php_cli.c:1181)
==28140==    by 0x463542: main (php_cli.c:1382)
==28140==  Block was alloc'd at
==28140==    at 0x4C2AF1F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==28140==    by 0xA6E8FF: _zend_mm_alloc_int (zend_alloc.c:1982)
==28140==    by 0xAE7DDA: ZEND_POST_INC_SPEC_CV_HANDLER (zend_vm_execute.h:30867)
==28140==    by 0xADFA1D: execute_ex (zend_vm_execute.h:363)
==28140==    by 0x167162E6: zend_oe (in /usr/local/php56/modules/ZendGuardLoader.so)
==28140==    by 0x164B3BEB: ??? (in /usr/local/php56/modules/ioncube_loader_lin_5.6.so)
==28140==    by 0xAA0770: zend_execute_scripts (zend.c:1341)
==28140==    by 0xA2FFF2: php_execute_script (main.c:2613)
==28140==    by 0xB58D2E: do_cli (php_cli.c:998)
==28140==    by 0x463542: main (php_cli.c:1382)
==28140==
==28140== Invalid write of size 4
==28140==    at 0xA8C63C: zval_delref_p (zend.h:411)
==28140==    by 0xA8C63C: i_zval_ptr_dtor (zend_execute.h:76)
==28140==    by 0xA8C63C: _zval_ptr_dtor (zend_execute_API.c:424)
==28140==    by 0xAAFB4F: i_zend_hash_bucket_delete (zend_hash.c:182)
==28140==    by 0xAAFB4F: zend_hash_bucket_delete (zend_hash.c:192)
==28140==    by 0xAAFB4F: zend_hash_graceful_reverse_destroy (zend_hash.c:613)
==28140==    by 0xA8CC55: shutdown_executor (zend_execute_API.c:244)
==28140==    by 0xA9EE55: zend_deactivate (zend.c:960)
==28140==    by 0xA2EB6F: php_request_shutdown (main.c:1899)
==28140==    by 0xB5807E: do_cli (php_cli.c:1181)
==28140==    by 0x463542: main (php_cli.c:1382)
==28140==  Address 0x2a1ec220 is 261,984 bytes inside a block of size 262,144 free'd
==28140==    at 0x4C2C14B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==28140==    by 0xA71740: zend_mm_del_segment (zend_alloc.c:928)
==28140==    by 0xA71740: _zend_mm_free_int (zend_alloc.c:2115)
==28140==    by 0xA71740: _efree (zend_alloc.c:2440)
==28140==    by 0xAAF7FD: zend_hash_destroy (zend_hash.c:553)
==28140==    by 0xA9DD8A: _zval_dtor_func (zend_variables.c:45)
==28140==    by 0xA8C67F: _zval_dtor (zend_variables.h:35)
==28140==    by 0xA8C67F: i_zval_ptr_dtor (zend_execute.h:79)
==28140==    by 0xA8C67F: _zval_ptr_dtor (zend_execute_API.c:424)
==28140==    by 0xAAFB4F: i_zend_hash_bucket_delete (zend_hash.c:182)
==28140==    by 0xAAFB4F: zend_hash_bucket_delete (zend_hash.c:192)
==28140==    by 0xAAFB4F: zend_hash_graceful_reverse_destroy (zend_hash.c:613)
==28140==    by 0xA8CC55: shutdown_executor (zend_execute_API.c:244)
==28140==    by 0xA9EE55: zend_deactivate (zend.c:960)
==28140==    by 0xA2EB6F: php_request_shutdown (main.c:1899)
==28140==    by 0xB5807E: do_cli (php_cli.c:1181)
==28140==    by 0x463542: main (php_cli.c:1382)
==28140==  Block was alloc'd at
==28140==    at 0x4C2AF1F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==28140==    by 0xA6E8FF: _zend_mm_alloc_int (zend_alloc.c:1982)
==28140==    by 0xAE7DDA: ZEND_POST_INC_SPEC_CV_HANDLER (zend_vm_execute.h:30867)
==28140==    by 0xADFA1D: execute_ex (zend_vm_execute.h:363)
==28140==    by 0x167162E6: zend_oe (in /usr/local/php56/modules/ZendGuardLoader.so)
==28140==    by 0x164B3BEB: ??? (in /usr/local/php56/modules/ioncube_loader_lin_5.6.so)
==28140==    by 0xAA0770: zend_execute_scripts (zend.c:1341)
==28140==    by 0xA2FFF2: php_execute_script (main.c:2613)
==28140==    by 0xB58D2E: do_cli (php_cli.c:998)
==28140==    by 0x463542: main (php_cli.c:1382)
==28140==
==28140== Invalid read of size 1
==28140==    at 0xA8C665: gc_zval_check_possible_root (zend_gc.h:182)
==28140==    by 0xA8C665: i_zval_ptr_dtor (zend_execute.h:86)
==28140==    by 0xA8C665: _zval_ptr_dtor (zend_execute_API.c:424)
==28140==    by 0xAAFB4F: i_zend_hash_bucket_delete (zend_hash.c:182)
==28140==    by 0xAAFB4F: zend_hash_bucket_delete (zend_hash.c:192)
==28140==    by 0xAAFB4F: zend_hash_graceful_reverse_destroy (zend_hash.c:613)
==28140==    by 0xA8CC55: shutdown_executor (zend_execute_API.c:244)
==28140==    by 0xA9EE55: zend_deactivate (zend.c:960)
==28140==    by 0xA2EB6F: php_request_shutdown (main.c:1899)
==28140==    by 0xB5807E: do_cli (php_cli.c:1181)
==28140==    by 0x463542: main (php_cli.c:1382)
==28140==  Address 0x2a1ec224 is 261,988 bytes inside a block of size 262,144 free'd
==28140==    at 0x4C2C14B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==28140==    by 0xA71740: zend_mm_del_segment (zend_alloc.c:928)
==28140==    by 0xA71740: _zend_mm_free_int (zend_alloc.c:2115)
==28140==    by 0xA71740: _efree (zend_alloc.c:2440)
==28140==    by 0xAAF7FD: zend_hash_destroy (zend_hash.c:553)
==28140==    by 0xA9DD8A: _zval_dtor_func (zend_variables.c:45)
==28140==    by 0xA8C67F: _zval_dtor (zend_variables.h:35)
==28140==    by 0xA8C67F: i_zval_ptr_dtor (zend_execute.h:79)
==28140==    by 0xA8C67F: _zval_ptr_dtor (zend_execute_API.c:424)
==28140==    by 0xAAFB4F: i_zend_hash_bucket_delete (zend_hash.c:182)
==28140==    by 0xAAFB4F: zend_hash_bucket_delete (zend_hash.c:192)
==28140==    by 0xAAFB4F: zend_hash_graceful_reverse_destroy (zend_hash.c:613)
==28140==    by 0xA8CC55: shutdown_executor (zend_execute_API.c:244)
==28140==    by 0xA9EE55: zend_deactivate (zend.c:960)
==28140==    by 0xA2EB6F: php_request_shutdown (main.c:1899)
==28140==    by 0xB5807E: do_cli (php_cli.c:1181)
==28140==    by 0x463542: main (php_cli.c:1382)
==28140==  Block was alloc'd at
==28140==    at 0x4C2AF1F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==28140==    by 0xA6E8FF: _zend_mm_alloc_int (zend_alloc.c:1982)
==28140==    by 0xAE7DDA: ZEND_POST_INC_SPEC_CV_HANDLER (zend_vm_execute.h:30867)
==28140==    by 0xADFA1D: execute_ex (zend_vm_execute.h:363)
==28140==    by 0x167162E6: zend_oe (in /usr/local/php56/modules/ZendGuardLoader.so)
==28140==    by 0x164B3BEB: ??? (in /usr/local/php56/modules/ioncube_loader_lin_5.6.so)
==28140==    by 0xAA0770: zend_execute_scripts (zend.c:1341)
==28140==    by 0xA2FFF2: php_execute_script (main.c:2613)
==28140==    by 0xB58D2E: do_cli (php_cli.c:998)
==28140==    by 0x463542: main (php_cli.c:1382)

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports

[2017-11-02 20:26 UTC] nikic@php.net

-Status: Open +Status: Closed -Assigned To: +Assigned To: nikic

[2017-11-02 20:26 UTC] nikic@php.net

This no longer reproduces on PHP 7.0 and I remember that some issues relating to memory limit bailouts have been fixed. As PHP 5.6 is out of active support, I'm closing this issue.

	php.net \| support \| documentation \| report a bug \| advanced search \| search howto \| statistics \| random bug \| login
go to bug id or search bugs for


Copyright © 2001-2025 The PHP Group All rights reserved.	Last updated: Tue Nov 04 02:00:01 2025 UTC