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From Robert Rigg <riggs...@gmail.com>
Subject [users@httpd] Re: Segmentation Fault when httpd child processes reach MaxRequestsPerChild
Date Mon, 16 Sep 2013 18:32:13 GMT
Was able to get a full backtrace:

(gdb) bt full
> #0  __pthread_mutex_lock (mutex=0x0) at pthread_mutex_lock.c:50
>         type = <value optimized out>
>         id = <value optimized out>
> #1  0x00007f6595fd30b9 in PR_Lock (lock=0x0) at
> ../../../mozilla/nsprpub/pr/src/pthreads/ptsynch.c:174
> No locals.
> #2  0x00007f659686a038 in PK11_GetAttributes (arena=0x7f659d795560,
> slot=0x7f659d4e9310, obj=13,
>     attr=0x7fffbed0ef50, count=2) at pk11obj.c:190
>         i = <value optimized out>
>         mark = 0x0
>         crv = <value optimized out>
> #3  0x00007f659686a39c in PK11_MatchItem (slot=0x7f659d4e9310,
> searchID=13, matchclass=3) at pk11obj.c:1657
>         theTemplate = {{type = 258, pValue = 0x0, ulValueLen = 0}, {type =
> 0, pValue = 0x0, ulValueLen = 0}}
>         keyclass = 0x7fffbed0ef68
>         peerID = <value optimized out>
>         parent = <value optimized out>
>         arena = 0x7f659d795560
>         crv = <value optimized out>
> #4  0x00007f6596892106 in nssToken_IsPrivateKeyAvailable
> (token=0x7f659d787e20, c=<value optimized out>,
>     instance=0x7f659cf99450) at devtoken.c:1579
>         theClass = <value optimized out>
> #5  0x00007f659688998c in NSSCertificate_IsPrivateKeyAvailable
> (c=0x7f659d805508, uhh=<value optimized out>,
>     statusOpt=<value optimized out>) at certificate.c:730
>         instance = <value optimized out>
>         isUser = <value optimized out>
>         ip = 0x7f659d7dcb40
>         instances = 0x7f659d7dcb40
> #6  0x00007f65968908ea in nssTrust_GetCERTCertTrustForCert
> (c=0x7f659d805508, cc=<value optimized out>)
>     at pki3hack.c:634
>         rvTrust = 0x7f659d7f73a0
>         td = <value optimized out>
>         t = 0x0
> #7  0x00007f659689148e in fill_CERTCertificateFields (c=0x7f659d805508,
> forceUpdate=<value optimized out>)
>     at pki3hack.c:826
>         nssTrust = <value optimized out>
>         context = 0x0
>         trust = 0x0
>         instance = 0x7f659d7dce50
>         stanNick = <value optimized out>
> #8  stan_GetCERTCertificate (c=0x7f659d805508, forceUpdate=<value
> optimized out>) at pki3hack.c:894
>         dc = <value optimized out>
>         cc = 0x7f659d7f66b0
>         certTrust = {sslFlags = 2642323008, emailFlags = 32613,
> objectSigningFlags = 2525549026}
> #9  0x00007f659688d2d0 in nssTrustDomain_RemoveTokenCertsFromCache
> (td=<value optimized out>,
>     token=<value optimized out>) at tdcache.c:452
>         certs = <value optimized out>
>         i = <value optimized out>
>         dtor = {token = 0x7f659cebee70, cache = 0x7f659cea7240, certs =
> 0x7f659d806c70, numCerts = 2,
>           arrSize = 10}
> #10 0x00007f659689198d in STAN_RemoveModuleFromDefaultTrustDomain
> (module=0x7f659ceae130) at pki3hack.c:194
> ---Type <return> to continue, or q <return> to quit---
>         token = 0x7f659cebee70
>         td = 0x7f659cea6980
>         i = <value optimized out>
> #11 0x00007f659686a628 in SECMOD_UnloadUserModule (mod=0x7f659ceae130) at
> pk11pars.c:1127
>         rv = SECSuccess
>         atype = 0
>         moduleLock = 0x7f659cfa9f20
> #12 0x00007f659741fcda in tlsm_nss_shutdown_cb (appData=<value optimized
> out>, nssData=<value optimized out>)
>     at ../../../libraries/libldap/tls_m.c:1227
> No locals.
> #13 0x00007f659683a9b2 in nss_ShutdownShutdownList () at nssinit.c:1052
>         funcPair = <value optimized out>
>         rv = <value optimized out>
>         i = <value optimized out>
> #14 nss_Shutdown () at nssinit.c:1080
>         shutdownRV = SECSuccess
>         rv = <value optimized out>
>         status = <value optimized out>
>         temp = <value optimized out>
> #15 0x00007f659683aba3 in NSS_ShutdownContext (context=<value optimized
> out>) at nssinit.c:1215
>         rv = SECSuccess
> #16 0x00007f6597420e72 in tlsm_ctx_free (ctx=0x7f659cfae1a0) at
> ../../../libraries/libldap/tls_m.c:2178
>         c = 0x7f659cfae1a0
>         refcount = <value optimized out>
> #17 0x00007f659741cc92 in ldap_int_tls_destroy (lo=0x7f6597635f60) at
> ../../../libraries/libldap/tls2.c:105
> No locals.
> #18 0x00007f65973f87cf in __do_global_dtors_aux () from
> /lib64/libldap-2.4.so.2.5.6
> No symbol table info available.
> #19 0x0000000000000000 in ?? ()
> No symbol table info available.



On Fri, Aug 30, 2013 at 11:28 AM, Robert Rigg <riggs685@gmail.com> wrote:

> All httpd child processes Segmentation fault near MaxRequestsPerChild,
> seemingly when it is time for the process to recycle.
>  MaxRequestsPerChild currently set to 10000.  I am also not able to
> reproduce this on a test system.  Child process exits clean when attached
> with gdb.  Child process also exits clean on stops/restarts.
>
>     [notice] child pid 14054 exit signal Segmentation fault (11)
>
>
> #Info:
>
> RHEL 6.4
>
>
>     Server version: Apache/2.2.15 (Unix)
>>     Server built:   Apr 29 2013 04:13:12
>>     Server's Module Magic Number: 20051115:25
>>     Server loaded:  APR 1.3.9, APR-Util 1.3.9
>>     Compiled using: APR 1.3.9, APR-Util 1.3.9
>>     Architecture:   64-bit
>>     Server MPM:     Prefork
>>       threaded:     no
>>         forked:     yes (variable process count)
>>     Server compiled with....
>>      -D APACHE_MPM_DIR="server/mpm/prefork"
>>      -D APR_HAS_SENDFILE
>>      -D APR_HAS_MMAP
>>      -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
>>      -D APR_USE_SYSVSEM_SERIALIZE
>>      -D APR_USE_PTHREAD_SERIALIZE
>>      -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
>>      -D APR_HAS_OTHER_CHILD
>>      -D AP_HAVE_RELIABLE_PIPED_LOGS
>>      -D DYNAMIC_MODULE_LIMIT=128
>>      -D HTTPD_ROOT="/etc/httpd"
>>      -D SUEXEC_BIN="/usr/sbin/suexec"
>>      -D DEFAULT_PIDLOG="run/httpd.pid"
>>      -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
>>      -D DEFAULT_LOCKFILE="logs/accept.lock"
>>      -D DEFAULT_ERRORLOG="logs/error_log"
>>      -D AP_TYPES_CONFIG_FILE="conf/mime.types"
>>      -D SERVER_CONFIG_FILE="conf/httpd.conf"
>
>
> #
>
>     [debug] prefork.c(1018): AcceptMutex: sysvsem (default: sysvsem)
>
>
>
> #gdb bt sample:
>
>     Program terminated with signal 11, Segmentation fault.
>>     #0  __pthread_mutex_lock (mutex=0x0) at pthread_mutex_lock.c:50
>>     50        unsigned int type = PTHREAD_MUTEX_TYPE (mutex);
>
>
>
> #strace sample:
>
> *Filtered
>
>         open("/etc/pki/nssdb/pkcs11.txt", O_RDONLY) = 23
>>
>>         close(23)                               = 0
>>         open("/etc/ld.so.cache", O_RDONLY)      = 23
>>         close(23)                               = 0
>>         open("/usr/lib64/libnsssysinit.so", O_RDONLY) = 23
>>         close(23)                               = 0
>>         ...
>>         open("/etc/pki/nssdb/cert9.db", O_RDONLY) = 23
>>         fcntl(23, F_GETFD)                      = 0
>>         fcntl(23, F_SETFD, FD_CLOEXEC)          = 0
>>         fstat(23, {st_dev=makedev(8, 3), st_ino=1047848,
>> st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0,
>>         st_blksize=4096, st_blocks=24, st_size=9216,
>> st_atime=2010/01/12-15:18:17, st_mtime=2010/01/12-15:18:17
>>         , st_ctime=2013/08/20-09:59:34}) = 0
>>         lseek(23, 0, SEEK_SET)                  = 0
>>         read(23, "SQLite format 3\0\4\0\1\1\0@  \0\0\0\1\0\0\0\0"...,
>> 100) = 100
>>         fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET,
>> start=1073741824, len=1}) = 0
>>         fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET,
>> start=1073741826, len=510}) = 0
>>         fcntl(23, F_SETLK, {type=F_UNLCK, whence=SEEK_SET,
>> start=1073741824, len=1}) = 0
>>         fstat(23, {st_dev=makedev(8, 3), st_ino=1047848,
>> st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0,
>>         st_blksize=4096, st_blocks=24, st_size=9216,
>> st_atime=2010/01/12-15:18:17, st_mtime=2010/01/12-15:18:17
>>         , st_ctime=2013/08/20-09:59:34}) = 0
>>         lseek(23, 0, SEEK_SET)                  = 0
>>         read(23, "SQLite format 3\0\4\0\1\1\0@  \0\0\0\1\0\0\0\0"...,
>> 1024) = 1024
>>         lseek(23, 3072, SEEK_SET)               = 3072
>>         read(23,
>> "\r\0\0\0\1\0J\0\0J\3\315\0\0\0\0\0\0\0\0\0\0\0\2073\1\7\27\37\37\1\216"...,
>> 1024) = 1024
>>         lseek(23, 5120, SEEK_SET)               = 5120
>>         read(23,
>> "\r\0\0\0\5\2\302\0\3\212\3\275\3D\3\4\2\302\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
>> 1024) = 1024
>>         fcntl(23, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0,
>> len=0}) = 0
>>         fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET,
>> start=1073741824, len=1}) = 0
>>         fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET,
>> start=1073741826, len=510}) = 0
>>         fcntl(23, F_SETLK, {type=F_UNLCK, whence=SEEK_SET,
>> start=1073741824, len=1}) = 0
>>         fstat(23, {st_dev=makedev(8, 3), st_ino=1047848,
>> st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0,
>>         st_blksize=4096, st_blocks=24, st_size=9216,
>> st_atime=2010/01/12-15:18:17, st_mtime=2010/01/12-15:18:17
>>         , st_ctime=2013/08/20-09:59:34}) = 0
>>
>>         ...
>>
>>     rt_sigprocmask(SIG_BLOCK, [INT], NULL, 8)      = 0
>>     rt_sigaction(SIGINT, {0x7f8dc4ec0e50, [], SA_RESTORER,
>> 0x7f8dc33f0920}, {0x7f8db3507f0c, ~[ILL ABRT BUS FPE KILL SEGV USR2 STOP
>> XCPU XFSZ SYS RTMIN RT_1], SA_RESTORER|SA_SIGINFO, 0x7f8dc33f0920}, 8) = 0
>>     rt_sigprocmask(SIG_UNBLOCK, [INT], NULL, 8) = 0
>>     munmap(0x7f8dae20f000, 2178616) = 0
>>     munmap(0x7f8daeced000, 2129488)         = 0
>>     munmap(0x7f8daead9000, 2176864)         = 0
>>     munmap(0x7f8dae89c000, 2343352)         = 0
>>     munmap(0x7f8dae627000, 2574912)         = 0
>>     munmap(0x7f8dae423000, 2109528)         = 0
>>     munmap(0x7f8daeef5000, 2142192)         = 0
>>     munmap(0x7f8daf100000, 2125616)         = 0
>>     munmap(0x7f8daf307000, 2128512) = 0
>>     munmap(0x7f8daf50f000, 2107408) = 0
>>     munmap(0x7f8daf712000, 2103968) = 0
>>     munmap(0x7f8daf914000, 2111904) = 0
>>     munmap(0x7f8dafb18000, 2162656) = 0
>>     munmap(0x7f8dafd28000, 2140264)         = 0
>>     munmap(0x7f8db0911000, 2116672) = 0
>>     munmap(0x7f8db044f000, 2099376)            = 0
>>     munmap(0x7f8db0650000, 2885912)                      = 0
>>     munmap(0x7f8db0b16000, 2123736)                      = 0
>>     munmap(0x7f8db0d1d000, 2357704) = 0
>>     munmap(0x7f8db11ec000, 2119816) = 0
>>     munmap(0x7f8db13f2000, 2125296)         = 0
>>     munmap(0x7f8db15f9000, 2198440)         = 0
>>     munmap(0x7f8db467b000, 2289928)         = 0
>>     munmap(0x7f8db48ab000, 2232272) = 0
>>     munmap(0x7f8db4e50000, 2149768) = 0
>>     munmap(0x7f8db4acc000, 3684744) = 0
>>     munmap(0x7f8db5290000, 2142072) = 0
>>     munmap(0x7f8db505d000, 2303840)                              = 0
>>     munmap(0x7f8db549b000, 4278992)     = 0
>>     munmap(0x7f8db58b0000, 2148288)         = 0
>>     munmap(0x7f8db5abd000, 2131392) = 0
>>     munmap(0x7f8db6d48000, 2440032)         = 0
>>     munmap(0x7f8db6aab000, 2737840)         = 0
>>     munmap(0x7f8db655d000, 2165496) = 0
>>     munmap(0x7f8db676e000, 3394936) = 0
>>     munmap(0x7f8db6337000, 2250552)         = 0
>>     munmap(0x7f8db60e7000, 2423648)         = 0
>>     munmap(0x7f8db5ec9000, 2217576)         = 0
>>     munmap(0x7f8db5cc6000, 2106112)         = 0
>>     munmap(0x7f8db6f9c000, 3939304)         = 0
>>     munmap(0x7f8db735e000, 2268048)         = 0
>>     fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741824,
>> len=1}) = 0
>>     fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741826,
>> len=510}) = 0
>>     fcntl(23, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=1073741824,
>> len=1}) = 0
>>     access("/etc/pki/nssdb/cert9.db-journal", F_OK)
>>        = -1 ENOENT (No such file or directory)
>>     fstat(23, {st_dev=makedev(8, 3), st_ino=1047848,
>> st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096,
>> st_blocks=24, st_size=9216, st_atime=2010/01/12-15:18:17,
>> st_mtime=2010/01/12-15:18:17, st_ctime=2013/08/20-09:59:34}) = 0
>>     lseek(23, 24, SEEK_SET) = 24
>>     read(23, "\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0", 16) = 16
>>     fcntl(23, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) =
>> 0
>>     fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741824,
>> len=1})                              = 0
>>     fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741826,
>> len=510}) = 0
>>     fcntl(23, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=1073741824,
>> len=1}) = 0
>>     access("/etc/pki/nssdb/cert9.db-journal", F_OK) = -1 ENOENT (No such
>> file or directory)
>>     fstat(23, {st_dev=makedev(8, 3), st_ino=1047848,
>> st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096,
>> st_blocks=24, st_size=9216, st_atime=2010/01/12-15:18:17,
>> st_mtime=2010/01/12-15:18:17, st_ctime=2013/08/20-09:59:34}) = 0
>>     lseek(23, 24, SEEK_SET)                 = 24
>>     read(23, "\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0", 16) = 16
>>     fcntl(23, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) =
>> 0
>>     brk(0x7f8dc6191000)                     = 0x7f8dc6191000
>>     munmap(0x7f8db7e3e000, 2161288)         = 0
>>     munmap(0x7f8db7bea000, 2438600)         = 0
>>     munmap(0x7f8db79b8000, 2301736)         = 0
>>     munmap(0x7f8db7588000, 2257152)         = 0
>>     close(8)                                = 0
>>     close(7)                                = 0
>>     fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741824,
>> len=1}) = 0
>>     fcntl(23, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741826,
>> len=510}) = 0
>>     fcntl(23, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=1073741824,
>> len=1}) = 0
>>     access("/etc/pki/nssdb/cert9.db-journal", F_OK) = -1 ENOENT (No such
>> file or directory)
>>     fstat(23, {st_dev=makedev(8, 3), st_ino=1047848,
>> st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096,
>> st_blocks=24, st_size=9216, st_atime=2010/01/12-15:18:17,
>> st_mtime=2010/01/12-15:18:17, st_ctime=2013/08/20-09:59:34}) = 0
>>     lseek(23, 24, SEEK_SET) = 24
>>     read(23, "\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0", 16) = 16
>>     fcntl(23, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) =
>> 0
>>     --- SIGSEGV (Segmentation fault) @ 0 (0) ---
>>     chdir("/apache2/apache-dumps") = 0
>>     rt_sigaction(SIGSEGV, {SIG_DFL, [], SA_RESTORER|SA_INTERRUPT,
>> 0x7f8dc3760500}, {SIG_DFL, [], SA_RESTORER|SA_RESETHAND, 0x7f8dc3760500},
>> 8) = 0
>>     kill(26317, SIGSEGV) = 0
>>     rt_sigreturn(0x66cd) = 140246846382624
>>     --- SIGSEGV (Segmentation fault) @ 0 (0) ---
>>
>>

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