PHP-FPM7 SIGSEGV - コアダンプ

php-fpm7をsegfaultingする1つのサイトにいくつかの問題があります。

このようなことが発生する正確な瞬間を正確に知ることができないようです。サイトを閲覧してしばらくして何かが閉じられると、コアダンプが生成されます（しばしば頻繁に発生します）。

[Fri Aug 11 14:31:37 2017] php-fpm[15202]: segfault at 7f68cdd238c5 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:36:50 2017] php-fpm[18507]: segfault at 7f68cd5d0345 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:37:17 2017] php-fpm[18658]: segfault at 7f68cd5b6345 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:38:06 2017] php-fpm[18884]: segfault at 7f68cd5286e5 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:38:21 2017] php-fpm[18944]: segfault at 7f68cd5fc525 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:39:26 2017] php-fpm[19447]: segfault at 7f68cd30c915 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:42:34 2017] php-fpm[21669]: segfault at 7f68cd5575c5 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:47:29 2017] php-fpm[24499]: segfault at 7f68cd536685 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:48:30 2017] php-fpm[25072]: segfault at 7f68cd554725 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:48:54 2017] php-fpm[24750]: segfault at 7f68ccd5a5c5 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]
[Fri Aug 11 14:49:49 2017] php-fpm[25857]: segfault at 7f68cd5f6ba5 ip 0000562a8248055f sp 00007ffc22d8ea70 error 4 in php-fpm7.0[562a82214000+45e000]

スタックトレースを見ると、一部のSOAPリクエストが破損しているように見えますが、ここで競合が発生しているようですが、サイトソースでSOAPリクエストを見つけることもできません。

最初はphp7.0-devをインストールしようとしましたが、スタックトレースのエラーのためにすでにインストールしました。/usr/src/builddir/Zend/zend_string.h: No such file or directory

PHP-FPMバージョン

PHP 7.0.20-1~dotdeb+8.2 (fpm-fcgi)
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.0.20-1~dotdeb+8.2, Copyright (c) 1999-2017, by Zend Technologies

PHP-FPM プールの設定

[mysite]
user = mysite
group = mysite
prefix = /data/sites/mysite
listen = /var/run/php-fpm-mysite.sock
chdir = /data/sites/mysite/public_html
php_admin_value[disable_functions] = exec,passthru,shell_exec,system
listen.owner = www-data
listen.group = www-data
pm = ondemand
pm.process_idle_timeout = 10s
pm.max_children = 4
pm.max_requests = 200
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 2
php_value[session.save_path] = /tmp/php/sessions
php_value[session_save_path] = /tmp/php/sessions

PHPモジュール

ii  dh-php                         0.21-1~dotdeb+8.1                all          debhelper add-on to handle PHP PECL extensions
ii  php-common                     1:42-1~dotdeb+8.1                all          Common files for PHP packages
ii  php7.0-cli                     7.0.20-1~dotdeb+8.2              amd64        command-line interpreter for the PHP scripting language
ii  php7.0-common                  7.0.20-1~dotdeb+8.2              amd64        documentation, examples and common module for PHP
ii  php7.0-curl                    7.0.20-1~dotdeb+8.2              amd64        CURL module for PHP
ii  php7.0-dev                     7.0.20-1~dotdeb+8.2              amd64        Files for PHP7.0 module development
ii  php7.0-fpm                     7.0.20-1~dotdeb+8.2              amd64        server-side, HTML-embedded scripting language (FPM-CGI binary)
ii  php7.0-gd                      7.0.20-1~dotdeb+8.2              amd64        GD module for PHP
ii  php7.0-imagick                 3.4.3-1~dotdeb+8.1               amd64        Provides a wrapper to the ImageMagick library
ii  php7.0-imap                    7.0.20-1~dotdeb+8.2              amd64        IMAP module for PHP
ii  php7.0-intl                    7.0.20-1~dotdeb+8.2              amd64        Internationalisation module for PHP
ii  php7.0-json                    7.0.20-1~dotdeb+8.2              amd64        JSON module for PHP
ii  php7.0-mbstring                7.0.20-1~dotdeb+8.2              amd64        MBSTRING module for PHP
ii  php7.0-mcrypt                  7.0.20-1~dotdeb+8.2              amd64        libmcrypt module for PHP
ii  php7.0-mysql                   7.0.20-1~dotdeb+8.2              amd64        MySQL module for PHP
ii  php7.0-opcache                 7.0.20-1~dotdeb+8.2              amd64        Zend OpCache module for PHP
ii  php7.0-readline                7.0.20-1~dotdeb+8.2              amd64        readline module for PHP
ii  php7.0-soap                    7.0.20-1~dotdeb+8.2              amd64        SOAP module for PHP
ii  php7.0-xml                     7.0.20-1~dotdeb+8.2              amd64        DOM, SimpleXML, WDDX, XML, and XSL module for PHP
ii  php7.0-zip                     7.0.20-1~dotdeb+8.2              amd64        Zip module for PHP

プラットフォーム

Google Container Engine内のKubernetes / Dockerコンテナ

NGINXのバージョンとビルド

nginx version: nginx/1.10.3
built with OpenSSL 1.0.1t  3 May 2016
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-z,relro -Wl,-z,now' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-ipv6 --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-file-aio --with-threads --with-http_addition_module --with-http_geoip_module=dynamic --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module=dynamic --with-http_secure_link_module --with-http_sub_module --with-http_xslt_module=dynamic --with-stream=dynamic --with-stream_ssl_module --with-mail=dynamic --with-mail_ssl_module --add-dynamic-module=/usr/src/builddir/debian/modules/nginx-auth-pam --add-module=/usr/src/builddir/debian/modules/nginx-dav-ext-module --add-module=/usr/src/builddir/debian/modules/nginx-echo --add-module=/usr/src/builddir/debian/modules/nginx-upstream-fair --add-module=/usr/src/builddir/debian/modules/ngx_http_substitutions_filter_module --add-module=/usr/src/builddir/debian/modules/nginx-cache-purge --add-module=/usr/src/builddir/debian/modules/nginx-x-rid-header --with-ld-opt=-lossp-uuid

スタックトレース

Program terminated with signal SIGSEGV, Segmentation fault.
#0  zend_string_release (s=0x7fd20d50c4c0) at /usr/src/builddir/Zend/zend_string.h:269
269     /usr/src/builddir/Zend/zend_string.h: No such file or directory.
(gdb) bt full
#0  zend_string_release (s=0x7fd20d50c4c0) at /usr/src/builddir/Zend/zend_string.h:269
No locals.
#1  zend_hash_destroy (ht=0x55d590f01c30) at /usr/src/builddir/Zend/zend_hash.c:1277
        p = 0x55d590f01c90
        end = 0x55d590f01d10
#2  0x00007fd215897c21 in delete_type_persistent (zv=<optimized out>) at /usr/src/builddir/ext/soap/php_schema.c:2459
        type = 0x55d590f01b10
#3  0x000055d58e956e55 in zend_hash_destroy (ht=0x55d590ef8380) at /usr/src/builddir/Zend/zend_hash.c:1264
        p = 0x55d590f003c8
        end = 0x55d590f00aa8
#4  0x00007fd21589f121 in delete_psdl_int (p=<optimized out>) at /usr/src/builddir/ext/soap/php_sdl.c:3130
        tmp = 0x55d590ef8270
#5  0x00007fd21589f18f in delete_psdl (zv=0x55d590f211a0) at /usr/src/builddir/ext/soap/php_sdl.c:3150
No locals.
#6  0x000055d58e956ef6 in zend_hash_destroy (ht=0x55d590efcf40) at /usr/src/builddir/Zend/zend_hash.c:1275
        p = 0x55d590f211a0
        end = 0x55d590f21200
#7  0x00007fd21586f71b in zm_shutdown_soap (type=<optimized out>, module_number=40) at /usr/src/builddir/ext/soap/soap.c:598
No locals.
#8  0x000055d58e94c577 in module_destructor (module=module@entry=0x55d590c19f20) at /usr/src/builddir/Zend/zend_API.c:2505
No locals.
#9  0x000055d58e94460c in module_destructor_zval (zv=<optimized out>) at /usr/src/builddir/Zend/zend.c:620
        module = 0x55d590c19f20
#10 0x000055d58e9579c9 in _zend_hash_del_el_ex (prev=<optimized out>, p=<optimized out>, idx=<optimized out>, ht=<optimized out>) at /usr/src/builddir/Zend/zend_hash.c:1025
        tmp = {value = {lval = 94375745003296, dval = 4.6627813406802235e-310, counted = 0x55d590c19f20, str = 0x55d590c19f20, arr = 0x55d590c19f20, obj = 0x55d590c19f20, 
            res = 0x55d590c19f20, ref = 0x55d590c19f20, ast = 0x55d590c19f20, zv = 0x55d590c19f20, ptr = 0x55d590c19f20, ce = 0x55d590c19f20, func = 0x55d590c19f20, ww = {w1 = 2428608288, 
              w2 = 21973}}, u1 = {v = {type = 17 '\021', type_flags = 0 '\000', const_flags = 0 '\000', reserved = 0 '\000'}, type_info = 17}, u2 = {var_flags = 21973, next = 21973, 
            cache_slot = 21973, lineno = 21973, num_args = 21973, fe_pos = 21973, fe_iter_idx = 21973}}
#11 _zend_hash_del_el (p=0x55d590c0ed00, idx=39, ht=0x55d58edf0d60 <module_registry>) at /usr/src/builddir/Zend/zend_hash.c:1049
        prev = <optimized out>
#12 zend_hash_graceful_reverse_destroy (ht=ht@entry=0x55d58edf0d60 <module_registry>) at /usr/src/builddir/Zend/zend_hash.c:1505
        idx = 39
        p = 0x55d590c0ed00
#13 0x000055d58e94a95c in zend_destroy_modules () at /usr/src/builddir/Zend/zend_API.c:1982
No locals.
#14 0x000055d58e9456a5 in zend_shutdown () at /usr/src/builddir/Zend/zend.c:856
No locals.
#15 0x000055d58e8e4c0b in php_module_shutdown () at /usr/src/builddir/main/main.c:2360
No locals.
#16 0x000055d58e7ca015 in main (argc=-1865301124, argv=0x55d590d1c2dc) at /usr/src/builddir/sapi/fpm/fpm/fpm_main.c:2021
        c = -1865319872
        file_handle = {handle = {fd = 591867904, fp = 0x7fd223473000, stream = {handle = 0x7fd223473000, isatty = 0, mmap = {len = 3799, pos = 0, map = 0x0, 
                buf = 0x7fd2260ed000 <error: Cannot access memory at address 0x7fd2260ed000>, old_handle = 0x0, old_closer = 0x0}, reader = 0x55d58e8fc140 <_php_stream_read>, 
              fsizer = 0x55d58e8e2990 <php_zend_stream_fsizer>, closer = 0x55d58e8e2970 <php_zend_stream_mmap_closer>}}, filename = 0x7fd223402000 "( @#\322\177", opened_path = 0x0, 
          type = ZEND_HANDLE_FILENAME, free_filename = 0 '\000'}
        max_requests = 200
        fcgi_fd = -1897990464
        __func__ = "main"

どんな洞察力でも大変感謝いたします。この問題の原因が何であるかわからないようです。