How to solve the problem of php script segmentation error

Solution to php script segmentation error: 1. Upgrade the PHP version; 2. Delete the "/etc/pki/nssdb/pkcs11.txt" and "/etc/pki/nssdb/cert9.db" files. Can.

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PHP uses file_get_contents or curl to request https domain names. A segment fault error will occur.

The problem PHP code is as follows. A segment fault will occur when executing this PHP command:

var_dump(file_get_contents("https://www.baidu.com"));

Solution:

1. Upgrade your PHP version, In the 5.4 environment, the problem cannot be reproduced (the above execution code is PHP5.2)

2. Sadly, this has not been the case. Removing /etc/pki/nssdb/pkcs11.txt and / etc/pki/nssdb/cert9.db seem to be the key, here. :-((The solution provided on Centos bugs is feasible after practice, but it will reappear soon after deleting it)

But Why does a segmentation fault occur?

PHP version:

PHP 5.2.14 (cli) (built: Jul  3 2016 23:56:15)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2010 Zend Technologies
    with eAccelerator v1.0-dev, Copyright (c) 2004-2012 eAccelerator, by eAccelerator

Linux system information:

LSB Version:    :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID: CentOS
Description:    CentOS release 6.3 (Final)
Release:        6.3
Codename:       Final

By checking the kernel log and gdb record, you can find that the problem occurs on libsqlite

Kernel log:

tail -f /var/log/messages
kernel: php[26564]: segfault at 8048 ip 00007f7a72fede9c sp 00007fffec90edf0 error 4 in libsqlite3.so.0.8.6[7f7a72fd1000+8c000]

gdb record:

Program received signal SIGSEGV, Segmentation fault.
0x00007fffe9651e9c in sqlite3_file_control () from /usr/lib64/libsqlite3.so.0

In the Centos bug list, you can find a description of this bug:

https://bugs.centos.org/view.php?id=7399
https://www.mankier.com/5/cert9.db

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