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Bug #79943 pecl/php segmentation fault (core dumped) after pecl install --force
Submitted: 2020-08-07 19:50 UTC Modified: 2021-08-05 13:44 UTC
Votes:3
Avg. Score:4.0 ± 0.8
Reproduced:3 of 3 (100.0%)
Same Version:2 (66.7%)
Same OS:1 (33.3%)
From: archon810 at gmail dot com Assigned: cmb (profile)
Status: Not a bug Package: PECL (PECL)
PHP Version: 7.4.9 OS: Linux OpenSUSE 15.2
Private report: No CVE-ID: None
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 [2020-08-07 19:50 UTC] archon810 at gmail dot com 
Description:
------------
pecl install msgpack
# wait for success
pecl install --force msgpack
# observe segfault at the end of the force install

Build process completed successfully
Installing '/usr/lib64/php7/extensions/msgpack.so'
Installing '/usr/include/php7/ext/msgpack/php_msgpack.h'
install ok: channel://pecl.php.net/msgpack-2.1.1
configuration option "php_ini" is not set to php.ini location
You should add "extension=msgpack.so" to php.ini
Segmentation fault (core dumped)

Expected result:
----------------
No segfault

Actual result:
--------------
Segmentation fault (core dumped)

gdb php core.php.29968.nexus2.1596828832
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Reading symbols from php...
Reading symbols from /usr/lib/debug/usr/bin/php-7.4.9-lp152.278.1.x86_64.debug...
[New LWP 29968]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
bCore was generated by `/usr/bin/php -C -q -d include_path=/usr/share/php7/PEAR -d date.timezone=UTC -d'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000000003496 in ?? ()
Missing separate debuginfos, use: zypper install fontconfig-debuginfo-2.12.6-lp152.5.1.x86_64 glibc-debuginfo-2.26-lp152.25.10.x86_64 krb5-debuginfo-1.16.3-lp152.5.4.1.x86_64 libMagickCore-7_Q16HDRI6-debuginfo-7.0.7.34-lp152.11.6.x86_64 libMagickWand-7_Q16HDRI6-debuginfo-7.0.7.34-lp152.11.6.x86_64 libX11-6-debuginfo-1.6.5-lp152.4.5.x86_64 libXau6-debuginfo-1.0.8-lp152.3.4.x86_64 libXext6-debuginfo-1.3.3-lp152.3.4.x86_64 libXpm4-debuginfo-3.5.12-lp152.3.5.x86_64 libargon2-1-debuginfo-0.0+git20171227.670229c-lp152.4.5.x86_64 libbz2-1-debuginfo-1.0.6-lp152.6.98.x86_64 libexpat1-debuginfo-2.2.9-lp152.186.3.x86_64 libfftw3-3-debuginfo-3.3.8-lp152.101.1.x86_64 libfreetype6-debuginfo-2.10.1-lp152.2.2.1.x86_64 libgd3-debuginfo-2.2.5-lp152.8.3.x86_64 libglib-2_0-0-debuginfo-2.62.5-lp152.1.14.x86_64 libidn2-0-debuginfo-2.3.0-lp152.37.1.x86_64 libjbig2-debuginfo-2.1-lp152.3.6.x86_64 libjpeg8-debuginfo-8.1.2-lp152.7.3.x86_64 libkeyutils1-debuginfo-1.5.10-lp152.5.114.x86_64 liblcms2-2-debuginfo-2.9-lp152.80.3.x86_64 libldap-2_4-2-debuginfo-2.4.50-lp152.340.1.x86_64 liblqr-1-0-debuginfo-0.4.2-lp152.3.4.x86_64 libltdl7-debuginfo-2.4.6-9.d_t_b.34.x86_64 liblzma5-debuginfo-5.2.3-lp152.5.100.x86_64 libnghttp2-14-debuginfo-1.41.0-lp152.1.1.x86_64 libopenssl1_1-debuginfo-1.1.1g-lp152.80.15.x86_64 libpcre1-debuginfo-8.41-lp152.6.104.x86_64 libpcre2-8-0-debuginfo-10.35-lp152.49.3.x86_64 libpng16-16-debuginfo-1.6.34-lp152.4.6.x86_64 libpsl5-debuginfo-0.20.1-lp152.3.7.x86_64 libsasl2-3-debuginfo-2.1.26-lp152.7.3.x86_64 libselinux1-debuginfo-3.0-lp152.1.47.x86_64 libssh4-debuginfo-0.9.4-lp152.67.1.x86_64 libstdc++6-debuginfo-9.3.1+git1296-lp152.2.3.1.x86_64 libtiff5-debuginfo-4.0.9-lp152.10.6.x86_64 libunistring2-debuginfo-0.9.10-lp152.63.1.x86_64 libxcb1-debuginfo-1.13-lp152.4.5.x86_64 libxml2-2-debuginfo-2.9.7-lp152.9.1.x86_64 libz1-debuginfo-1.2.11-lp152.26.1.x86_64 php7-ctype-debuginfo-7.4.9-lp152.278.1.x86_64 php7-curl-debuginfo-7.4.9-lp152.278.1.x86_64 php7-dom-debuginfo-7.4.9-lp152.278.1.x86_64 php7-exif-debuginfo-7.4.9-lp152.278.1.x86_64 php7-fileinfo-debuginfo-7.4.9-lp152.278.1.x86_64 php7-imagick-debuginfo-3.4.4-lp152.32.1.x86_64 php7-json-debuginfo-7.4.9-lp152.278.1.x86_64 php7-mbstring-debuginfo-7.4.9-lp152.278.1.x86_64 php7-opcache-debuginfo-7.4.9-lp152.278.1.x86_64
(gdb) bt
#0  0x0000000000003496 in ?? ()
#1  0x00007f353844ab4b in zm_shutdown_msgpack (type=<optimized out>, module_number=<optimized out>) at /tmp/pear/temp/msgpack/msgpack.c:101
#2  0x0000556643cae6bb in module_destructor (module=module@entry=0x55664430d1e0) at /usr/src/debug/php7-7.4.9-lp152.278.1.x86_64/Zend/zend_API.c:2563
#3  0x0000556643ca77bc in module_destructor_zval (zv=<optimized out>) at /usr/src/debug/php7-7.4.9-lp152.278.1.x86_64/Zend/zend.c:768
#4  0x0000556643cba341 in _zend_hash_del_el_ex (prev=<optimized out>, p=<optimized out>, idx=26, ht=<optimized out>) at /usr/src/debug/php7-7.4.9-lp152.278.1.x86_64/Zend/zend_hash.c:1305
#5  _zend_hash_del_el (p=0x5566443a3ce0, idx=26, ht=0x5566442798c0 <module_registry>) at /usr/src/debug/php7-7.4.9-lp152.278.1.x86_64/Zend/zend_hash.c:1328
#6  zend_hash_graceful_reverse_destroy (ht=ht@entry=0x5566442798c0 <module_registry>) at /usr/src/debug/php7-7.4.9-lp152.278.1.x86_64/Zend/zend_hash.c:1782
#7  0x0000556643caca0c in zend_destroy_modules () at /usr/src/debug/php7-7.4.9-lp152.278.1.x86_64/Zend/zend_API.c:1995
#8  0x0000556643ca8ba3 in zend_shutdown () at /usr/src/debug/php7-7.4.9-lp152.278.1.x86_64/Zend/zend.c:1055
#9  0x0000556643c3b172 in php_module_shutdown () at /usr/src/debug/php7-7.4.9-lp152.278.1.x86_64/main/main.c:2481
#10 0x0000556643ac98b3 in main (argc=18, argv=0x5566442fb910) at /usr/src/debug/php7-7.4.9-lp152.278.1.x86_64/sapi/cli/php_cli.c:1374
(gdb) quit

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 [2020-08-07 19:52 UTC] archon810 at gmail dot com 
To clarify, this happens when force installing any PHP extension with pecl over an already installed extension.

For example:
pecl install --force stats-2.0.3
pecl install --force APCu_bc-beta
etc.
 [2021-08-05 13:44 UTC] cmb@php.net
-Status: Open +Status: Not a bug -Assigned To: +Assigned To: cmb
 [2021-08-05 13:44 UTC] cmb@php.net 
Yes, that's a known issue.  On Linux, it is possible to replace a
shared object file that is in use, but that likely causes issues
(the segfault in your case).  There is a detailed answer on Stack
Overflow[1].  Anyhow, this is not a php.net issue, but rather
related to the pear installer, so please report it there[2].

[1] <https://stackoverflow.com/questions/7767325/replacing-shared-object-so-file-while-main-program-is-running#answer-7779703>
[2] <https://pear.php.net/bugs/>
 
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