PHP :: Bug #73428 :: php-fpm hangs

Bug #73428	php-fpm hangs
Submitted:	2016-10-31 09:00 UTC	Modified:	2016-11-09 12:19 UTC
From:	chris at cretaforce dot gr	Assigned:
Status:	Closed	Package:	*General Issues
PHP Version:	5.6.27	OS:	FreeBSD 10.3-STABLE
Private report:	No	CVE-ID:	None

View Developer Edit

[2016-10-31 09:00 UTC] chris at cretaforce dot gr

Description:
------------
There is a problem with PHP 5.6.27 (maybe in previous version too) or Freebsd 10.3-STABLE (Wed Oct 26 20:16:09 EEST 2016) and randomly php-fpm (with pm=dynamic) hangs. It doesn't process requests for whole server. top shows 1 or 2 processes that use 100% CPU.

truss -p 32701

kill(18810,SIGKILL)                              ERR#3 'No such process'
fcntl(3,F_GETLK,0x7fffffffc5c0)                  = 0 (0x0)
kill(18810,SIGKILL)                              ERR#3 'No such process'
fcntl(3,F_GETLK,0x7fffffffc5c0)                  = 0 (0x0)
kill(18810,SIGKILL)                              ERR#3 'No such process'
fcntl(3,F_GETLK,0x7fffffffc5c0)                  = 0 (0x0)
kill(18810,SIGKILL)                              ERR#3 'No such process'
fcntl(3,F_GETLK,0x7fffffffc5c0)                  = 0 (0x0)

fstat -p 32701

USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W
gioannou php-fpm    32701 text /usr     162750 -rwxr-xr-x  4471845  r
gioannou php-fpm    32701   wd /        321033 drwxr-xr-x     512  r
gioannou php-fpm    32701 root /             2 drwxr-xr-x     512  r
gioannou php-fpm    32701    0* local stream fffff8032888e4b0
gioannou php-fpm    32701    1 /dev         13 crw-rw-rw-    null rw
gioannou php-fpm    32701    2 /dev         13 crw-rw-rw-    null rw
gioannou php-fpm    32701    3 -          6084 -rw-rw-rw-       0 rw
gioannou php-fpm    32701    4* local stream fffff80457b1aa50

procstat -kk 32701
  PID    TID COMM             TDNAME           KSTACK
32701 101779 php-fpm          -                <running>

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[2016-11-01 02:43 UTC] chris at cretaforce dot gr

gdb /usr/local/sbin/php-fpm 60638

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This GDB was configured as "amd64-marcel-freebsd"...(no debugging symbols found)...
Attaching to program: /usr/local/sbin/php-fpm, process 60638
Reading symbols from /lib/libcrypt.so.5...(no debugging symbols found)...done.
Loaded symbols for /lib/libcrypt.so.5
Reading symbols from /usr/local/lib/libpcre.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libpcre.so.1
Reading symbols from /lib/libm.so.5...(no debugging symbols found)...done.
Loaded symbols for /lib/libm.so.5
Reading symbols from /lib/libthr.so.3...(no debugging symbols found)...done.
[New Thread 802806400 (LWP 101470/php-fpm)]
Loaded symbols for /lib/libthr.so.3
Reading symbols from /usr/local/lib/libxml2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libxml2.so.2
Reading symbols from /lib/libz.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libz.so.6
Reading symbols from /usr/lib/liblzma.so.5...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/liblzma.so.5
Reading symbols from /lib/libc.so.7...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /usr/local/lib/php/20131226/ioncube/ioncube_loader.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/ioncube/ioncube_loader.so
Reading symbols from /usr/local/lib/php/20131226/opcache.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/opcache.so
Reading symbols from /usr/local/lib/php/20131226/session.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/session.so
Reading symbols from /usr/local/lib/php/20131226/bcmath.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/bcmath.so
Reading symbols from /usr/local/lib/php/20131226/bz2.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/bz2.so
Reading symbols from /usr/lib/libbz2.so.4...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libbz2.so.4
Reading symbols from /usr/local/lib/php/20131226/calendar.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/calendar.so
Reading symbols from /usr/local/lib/php/20131226/ctype.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/ctype.so
Reading symbols from /usr/local/lib/php/20131226/curl.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/curl.so
Reading symbols from /usr/local/lib/libcurl.so.4...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libcurl.so.4
Reading symbols from /usr/local/lib/libssl.so.9...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libssl.so.9
Reading symbols from /usr/local/lib/libcrypto.so.9...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libcrypto.so.9
Reading symbols from /usr/local/lib/php/20131226/dom.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/dom.so
Reading symbols from /usr/local/lib/php/20131226/exif.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/exif.so
Reading symbols from /usr/local/lib/php/20131226/fileinfo.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/fileinfo.so
Reading symbols from /usr/local/lib/php/20131226/filter.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/filter.so
Reading symbols from /usr/local/lib/php/20131226/ftp.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/ftp.so
Reading symbols from /usr/local/lib/php/20131226/gd.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/gd.so
Reading symbols from /usr/local/lib/libt1.so.5...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libt1.so.5
Reading symbols from /usr/local/lib/libpng16.so.16...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libpng16.so.16
Reading symbols from /usr/local/lib/libjpeg.so.8...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libjpeg.so.8
Reading symbols from /usr/local/lib/libfreetype.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libfreetype.so.6
Reading symbols from /usr/local/lib/php/20131226/gettext.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/gettext.so
Reading symbols from /usr/local/lib/libintl.so.8...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libintl.so.8
Reading symbols from /usr/local/lib/php/20131226/hash.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/hash.so
Reading symbols from /usr/local/lib/php/20131226/iconv.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/iconv.so
Reading symbols from /usr/local/lib/libiconv.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libiconv.so.2
Reading symbols from /usr/local/lib/php/20131226/imap.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/imap.so
Reading symbols from /usr/local/lib/libc-client4.so.9...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libc-client4.so.9
Reading symbols from /usr/lib/libpam.so.5...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpam.so.5
Reading symbols from /usr/local/lib/php/20131226/intl.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/intl.so
Reading symbols from /usr/local/lib/libicui18n.so.57...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libicui18n.so.57
Reading symbols from /usr/local/lib/libicuuc.so.57...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libicuuc.so.57
Reading symbols from /usr/local/lib/libicudata.so.57...
warning: Lowest section in /usr/local/lib/libicudata.so.57 is .hash at 0000000000000120
(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libicudata.so.57
Reading symbols from /usr/local/lib/libicuio.so.57...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libicuio.so.57
Reading symbols from /lib/libgcc_s.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libgcc_s.so.1
Reading symbols from /usr/lib/libc++.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libc++.so.1
Reading symbols from /lib/libcxxrt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libcxxrt.so.1
Reading symbols from /usr/local/lib/php/20131226/json.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/json.so
Reading symbols from /usr/local/lib/php/20131226/mbstring.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/mbstring.so
Reading symbols from /usr/local/lib/libonig.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libonig.so.1
Reading symbols from /usr/local/lib/php/20131226/mcrypt.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/mcrypt.so
Reading symbols from /usr/local/lib/libmcrypt.so.4...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libmcrypt.so.4
Reading symbols from /usr/local/lib/libltdl.so.7...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libltdl.so.7
Reading symbols from /usr/local/lib/php/20131226/mysql.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/mysql.so
Reading symbols from /usr/local/lib/php/20131226/mysqli.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/mysqli.so
Reading symbols from /usr/local/lib/php/20131226/openssl.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/openssl.so
Reading symbols from /usr/local/lib/php/20131226/pdo.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/pdo.so
Reading symbols from /usr/local/lib/php/20131226/posix.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/posix.so
Reading symbols from /usr/local/lib/php/20131226/simplexml.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/simplexml.so
Reading symbols from /usr/local/lib/php/20131226/soap.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/soap.so
Reading symbols from /usr/local/lib/php/20131226/sockets.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/sockets.so
Reading symbols from /usr/local/lib/php/20131226/sqlite3.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/sqlite3.so
Reading symbols from /usr/local/lib/libsqlite3.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libsqlite3.so.0
Reading symbols from /usr/local/lib/php/20131226/tidy.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/tidy.so
Reading symbols from /usr/local/lib/libtidy-0.99.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libtidy-0.99.so.0
Reading symbols from /usr/local/lib/php/20131226/tokenizer.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/tokenizer.so
Reading symbols from /usr/local/lib/php/20131226/xml.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/xml.so
Reading symbols from /usr/local/lib/php/20131226/xmlwriter.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/xmlwriter.so
Reading symbols from /usr/local/lib/php/20131226/zip.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/zip.so
Reading symbols from /usr/local/lib/libzip.so.4...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libzip.so.4
Reading symbols from /usr/local/lib/php/20131226/zlib.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/zlib.so
Reading symbols from /usr/local/lib/php/20131226/pdf.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/pdf.so
Reading symbols from /usr/local/lib/libpdf.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libpdf.so.6
Reading symbols from /usr/local/lib/php/20131226/pdo_mysql.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/pdo_mysql.so
Reading symbols from /usr/local/lib/php/20131226/pdo_sqlite.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/pdo_sqlite.so
Reading symbols from /usr/local/lib/php/20131226/phar.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/phar.so
Reading symbols from /usr/local/lib/php/20131226/xmlreader.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/xmlreader.so
Reading symbols from /usr/local/lib/php/20131226/xmlrpc.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/xmlrpc.so
Reading symbols from /usr/local/lib/php/20131226/xsl.so...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/php/20131226/xsl.so
Reading symbols from /usr/local/lib/libexslt.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libexslt.so.0
Reading symbols from /usr/local/lib/libxslt.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libxslt.so.1
Reading symbols from /usr/local/lib/libgcrypt.so.20...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libgcrypt.so.20
Reading symbols from /usr/local/lib/libgpg-error.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/local/lib/libgpg-error.so.0
Reading symbols from /libexec/ld-elf.so.1...(no debugging symbols found)...done.
Loaded symbols for /libexec/ld-elf.so.1
[Switching to Thread 802806400 (LWP 101470/php-fpm)]
0x0000000801dda4ba in _fcntl () from /lib/libc.so.7
(gdb)
(gdb) bt
#0  0x0000000801dda4ba in _fcntl () from /lib/libc.so.7
#1  0x0000000801d88506 in __fcntl_compat () from /lib/libc.so.7
#2  0x00000008012b7a78 in pthread_suspend_all_np () from /lib/libthr.so.3
#3  0x0000000801d885c2 in fcntl () from /lib/libc.so.7
#4  0x0000000802c0989b in accel_shutdown () from /usr/local/lib/php/20131226/opcache.so
#5  0x00000000005810c7 in zend_llist_apply ()
#6  0x000000000057d641 in init_executor ()
#7  0x000000000058bae3 in zend_activate ()
#8  0x00000000005319d3 in php_request_startup ()
#9  0x0000000000617531 in main ()
(gdb)

[2016-11-09 12:19 UTC] chris at cretaforce dot gr

Looks like the issue was with opcache_reset(). Some applications had access to reset the cache and maybe they flood it with such requests. I disable this function and everything is ok now.

[2016-11-09 12:19 UTC] chris at cretaforce dot gr

-Status: Open +Status: Closed

[2016-11-09 12:19 UTC] chris at cretaforce dot gr

Looks like the issue was with opcache_reset(). Some applications had access to reset the cache and maybe they flood it with such requests. I disable this function and everything is ok now.

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