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[2001-12-31 21:20 UTC] markhers at thinkbug dot com
I have been experimenting with semaphores/shmop to provide query caching for an application I am working on. The purpose, of course, bears no bearing on the issue I am reporting however as I am just doing testing of the two extensions at this point. I used this article as the starting point for my testing - http://zez.org/article/articleprint/46/. So I put together this script: ---------- function mtime() { return array_sum( explode( " ", microtime() ) ); } function supecho( $text ) { echo "<P><b>$text</b></p>\r\n"; flush(); } function subecho( $text ) { echo "<P><b> -->> $text</b></p>\r\n"; flush(); } supecho( "Starting semaphore testing..." ); // Start semaphore handling $semaphoreID = sem_get( 0xee3 , 1 , 0666 ); // Get a semaphore named "0xee3" supecho( "Attempting to get a semaphore" ); if( $semaphoreID ) { subecho( "success" ); supecho( "Attempt to obtain our shared memory segment" ); $testID = shmop_open( 0xff3, "ac", 0, 0); if( $testID ) // Already exists { subecho( "Success (opening with 'a' flag)" ); $sharedID = shmop_open( 0xff3, "a", 0, 0); } else // create it { subecho( "Does not exist..." ); supecho( "Attempting to create shared memory section with 'c' flag and 0xxf3 address" ); $sharedID = shmop_open( 0xff3, "c", 0644, 100); if( $sharedID ) { subecho( "Success" ); } else { subecho( "Failure" ); } } if( $sharedID ) { subecho( "Attempt to obtain a shared memory segment success" ); supecho( "Going for a semaphore acquisition" ); sem_acquire( $semaphoreID ); subecho( "Semaphore acquired" ); $myString = "a"; supecho( "Shared mem segment size (in bytes): ".shmop_size( $sharedID ) ); supecho( "Starting to read total segment" ); $start = mtime(); subecho( "Reading shared memory segment into memory --| ".shmop_read( $sharedID, 0, shmop_size( $sharedID ) ) ); subecho( ( ( shmop_size( $sharedID )) / ( mtime() - $start ) )." bytes/second" ); /* THIS WRITE STATEMENT CAUSES A SEGFAULT + + + \\ // - */ subecho( "Writing ".shmop_write( $sharedID, $myString, 0 )." bytes to block" ); /* ^ // \\ + + + THIS WRITE STATEMENT CAUSES A SEGFAULT */ supecho( "Closing shmop segment" ); shmop_close( $sharedID ); subecho( "Done" ); supecho( "Going for a semaphore release" ); sem_release( $semaphoreID ); subecho( "Semaphore released" ); } else { subecho( "Attempt to obtain a shared memory segment failed" ); } } else { subecho( "Attempt to get a semaphore failed" ); } ---------- When I run the script with the smhop_write call commented out, it runs fine and releases both the shmop segment and semaphore at the end. However, when it runs with the shmop_write call, it segfaults immediately after calling shmop_write, which all other actions are successful. My server is running RedHat 6.2 and kernel 2.4.3 - I tested the script against: Apache/1.3.22 + 4.0.6 Apache/1.3.22 + 4.1.1 4.0.6 CGI (run on command line, not CGI interface) 4.1.1 CGI (run on command line, not CGI interface) When I looked at ipcs, I see: < start > ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 1114112 nobody 600 368644 31 dest 0x00000ff3 1146881 nobody 644 100 0 ------ Semaphore Arrays -------- key semid owner perms nsems status 0x00000000 2064384 nobody 600 1 0x00000000 3178497 nobody 600 1 0x00000000 3211266 nobody 600 1 0x00000000 3440643 nobody 600 1 0x00000ee3 3473412 nobody 666 3 0x00000000 3506181 nobody 600 1 ------ Message Queues -------- key msqid owner perms used-bytes messages < end > So, the memory segment is created, and the script can proper identify that it has a size of 100. I straced (didn't know what else to do to include here) one of the commandline invocations with the following as it's output: < start > execve("/usr/local/php/bin/php", ["/usr/local/php/bin/php", "/home/sites/www.hotelgeneral.com/docroot/shm.php"], [/* 26 vars */]) = 0 brk(0) = 0x815ddb4 old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE| MAP_ANONYMOUS, -1, 0) = 0x40014000 open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/mysql/lib/mysql/i686/mmx/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/mysql/lib/mysql/i686/mmx", 0xbffff364) = - 1 ENOENT (No such file or directory) open("/usr/local/mysql/lib/mysql/i686/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/mysql/lib/mysql/i686", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/local/mysql/lib/mysql/mmx/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/mysql/lib/mysql/mmx", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/local/mysql/lib/mysql/libdl.so.2", O_RDONLY) = - 1 ENOENT (No such file or directory) stat("/usr/local/mysql/lib/mysql", {st_mode=S_IFDIR| S_ISGID|0755, st_size=4096, ...}) = 0 open("/usr/local/db4/lib/i686/mmx/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/db4/lib/i686/mmx", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/i686/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/db4/lib/i686", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/mmx/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/db4/lib/mmx", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/db4/lib", {st_mode=S_IFDIR|0755, st_size= 4096, ...}) = 0 open("/usr/lib/i686/mmx/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/lib/i686/mmx", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/lib/i686/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/lib/i686", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/lib/mmx/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/lib/mmx", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/lib/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/lib", {st_mode=S_IFDIR|0755, st_size=8192, ...}) = 0 open("/usr/local/lib/i686/mmx/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/lib/i686/mmx", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/local/lib/i686/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/lib/i686", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/local/lib/mmx/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/lib/mmx", 0xbffff364) = -1 ENOENT (No such file or directory) open("/usr/local/lib/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) stat("/usr/local/lib", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=13712, ...}) = 0 old_mmap(NULL, 13712, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40015000 close(3) = 0 open("/lib/libdl.so.2", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=75131, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\ 340\34"..., 4096) = 4096 old_mmap(NULL, 12428, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40019000 mprotect(0x4001b000, 4236, PROT_NONE) = 0 old_mmap(0x4001b000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x1000) = 0x4001b000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libz.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libz.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/libz.so.1", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=63492, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\ 240\31"..., 4096) = 4096 old_mmap(NULL, 58700, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4001d000 mprotect(0x4002a000, 5452, PROT_NONE) = 0 old_mmap(0x4002a000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xc000) = 0x4002a000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libcrypt.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libcrypt.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/libcrypt.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/lib/libcrypt.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/lib/libcrypt.so.1", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=66231, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@\ 17\0\000"..., 4096) = 4096 old_mmap(NULL, 184412, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4002c000 mprotect(0x40031000, 163932, PROT_NONE) = 0 old_mmap(0x40031000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x4000) = 0x40031000 old_mmap(0x40032000, 159836, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40032000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/lib/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) open("/lib/libresolv.so.2", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=169720, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\ 340&\0"..., 4096) = 4096 old_mmap(NULL, 60956, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4005a000 mprotect(0x40066000, 11804, PROT_NONE) = 0 old_mmap(0x40066000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xb000) = 0x40066000 old_mmap(0x40067000, 7708, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40067000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libpam.so.0", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libpam.so.0", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/libpam.so.0", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/lib/libpam.so.0", O_RDONLY) = -1 ENOENT (No such file or directory) open("/lib/libpam.so.0", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=33718, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\ 320\25"..., 4096) = 4096 old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE| MAP_ANONYMOUS, -1, 0) = 0x40069000 old_mmap(NULL, 32024, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4006a000 mprotect(0x40071000, 3352, PROT_NONE) = 0 old_mmap(0x40071000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x6000) = 0x40071000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libmysqlclient.so.10", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=138499, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\ 0000_\0\000"..., 4096) = 4096 old_mmap(NULL, 114720, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40072000 mprotect(0x4008a000, 16416, PROT_NONE) = 0 old_mmap(0x4008a000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x17000) = 0x4008a000 old_mmap(0x4008e000, 32, PROT_READ|PROT_WRITE, MAP_PRIVATE| MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4008e000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libdb-4.0.so", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libdb-4.0.so", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0444, st_size=591985, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0p\ 320\0"..., 4096) = 4096 old_mmap(NULL, 533644, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4008f000 mprotect(0x40110000, 5260, PROT_NONE) = 0 old_mmap(0x40110000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x80000) = 0x40110000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libgdbm.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libgdbm.so.2", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/libgdbm.so.2", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=29265, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@\ 25\0\000"..., 4096) = 4096 old_mmap(NULL, 23692, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40112000 mprotect(0x40117000, 3212, PROT_NONE) = 0 old_mmap(0x40117000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x4000) = 0x40117000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/lib/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/lib/libm.so.6", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=527442, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\ 320F\0"..., 4096) = 4096 old_mmap(NULL, 117208, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40118000 mprotect(0x40134000, 2520, PROT_NONE) = 0 old_mmap(0x40134000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x1b000) = 0x40134000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libnsl.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libnsl.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/libnsl.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/lib/libnsl.so.1", O_RDONLY) = -1 ENOENT (No such file or directory) open("/lib/libnsl.so.1", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=370141, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\ 20?\0\000"..., 4096) = 4096 old_mmap(NULL, 88104, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40135000 mprotect(0x40147000, 14376, PROT_NONE) = 0 old_mmap(0x40147000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x11000) = 0x40147000 old_mmap(0x40149000, 6184, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40149000 close(3) = 0 open("/usr/local/mysql/lib/mysql/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/db4/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/lib/libc.so.6", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=4101836, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\ 210\212"..., 4096) = 4096 old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE| MAP_ANONYMOUS, -1, 0) = 0x4014b000 old_mmap(NULL, 1001532, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4014c000 mprotect(0x40239000, 30780, PROT_NONE) = 0 old_mmap(0x40239000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xec000) = 0x40239000 old_mmap(0x4023d000, 14396, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4023d000 close(3) = 0 mprotect(0x4014c000, 970752, PROT_READ|PROT_WRITE) = 0 mprotect(0x4014c000, 970752, PROT_READ|PROT_EXEC) = 0 munmap(0x40015000, 13712) = 0 personality(PER_LINUX) = 0 getpid() = 14983 rt_sigaction(SIGPIPE, {SIG_IGN}, {SIG_DFL}, 8) = 0 brk(0) = 0x815ddb4 brk(0x815ddec) = 0x815ddec brk(0x815e000) = 0x815e000 brk(0x815f000) = 0x815f000 brk(0x8160000) = 0x8160000 brk(0x8161000) = 0x8161000 open("/usr/share/locale/locale.alias", O_RDONLY) = 3 fstat64(0x3, 0xbfffb534) = 0 old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE| MAP_ANONYMOUS, -1, 0) = 0x40015000 read(3, "# Locale name alias data base.\n#"..., 4096) = 2265 read(3, "", 4096) = 0 close(3) = 0 munmap(0x40015000, 4096) = 0 open("/usr/share/i18n/locale.alias", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en_US/LC_CTYPE", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=87756, ...}) = 0 old_mmap(NULL, 87756, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40241000 close(3) = 0 open("./php.ini", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/local/lib/php.ini", O_RDONLY) = 3 getcwd("/usr/local/src/php-4.1.1", 4095) = 25 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 lstat("/usr/local", {st_mode=S_IFDIR|S_ISGID|0755, st_size= 4096, ...}) = 0 lstat("/usr/local/lib", {st_mode=S_IFDIR|0755, st_size= 4096, ...}) = 0 lstat("/usr/local/lib/php.ini", {st_mode=S_IFREG|0644, st_size=24226, ...}) = 0 brk(0x8166000) = 0x8166000 ioctl(3, TCGETS, 0xbffff6f8) = -1 ENOTTY (Inappropriate ioctl for device) read(3, "[PHP]\n; $Id: php.ini-dist,v 1.78"..., 8192) = 8192 read(3, "n to end users, such as file pat"..., 8192) = 8192 brk(0x8167000) = 0x8167000 read(3, " use\n; the $MYSQL_TCP_PORT or th"..., 8192) = 7842 read(3, "", 350) = 0 brk(0x8168000) = 0x8168000 brk(0x8169000) = 0x8169000 read(3, "", 8192) = 0 ioctl(3, TCGETS, 0xbfffeb60) = -1 ENOTTY (Inappropriate ioctl for device) close(3) = 0 brk(0x816a000) = 0x816a000 brk(0x816b000) = 0x816b000 brk(0x816c000) = 0x816c000 brk(0x816d000) = 0x816d000 brk(0x816e000) = 0x816e000 brk(0x816f000) = 0x816f000 brk(0x8170000) = 0x8170000 brk(0x8171000) = 0x8171000 brk(0x8172000) = 0x8172000 brk(0x8173000) = 0x8173000 brk(0x8174000) = 0x8174000 brk(0x8175000) = 0x8175000 brk(0x8176000) = 0x8176000 brk(0x8177000) = 0x8177000 brk(0x8178000) = 0x8178000 brk(0x8179000) = 0x8179000 brk(0x817a000) = 0x817a000 brk(0x817b000) = 0x817b000 brk(0x817c000) = 0x817c000 brk(0x817d000) = 0x817d000 brk(0x817e000) = 0x817e000 brk(0x817f000) = 0x817f000 brk(0x8180000) = 0x8180000 brk(0x8182000) = 0x8182000 brk(0x8183000) = 0x8183000 brk(0x8184000) = 0x8184000 brk(0x8185000) = 0x8185000 setitimer(ITIMER_PROF, {it_interval={0, 0}, it_value={30, 0}}, NULL) = 0 rt_sigaction(SIGPROF, {0x80f0178, [], SA_RESTART| 0x4000000}, {SIG_DFL}, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [PROF], NULL, 8) = 0 brk(0x8186000) = 0x8186000 brk(0x8187000) = 0x8187000 brk(0x8188000) = 0x8188000 brk(0x8189000) = 0x8189000 time(NULL) = 1009843196 getpid() = 14983 getpid() = 14983 open("/home/sites/www.hotelgeneral.com/docroot/shm.php", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0777, st_size=2963, ...}) = 0 getcwd("/usr/local/src/php-4.1.1", 4095) = 25 lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 lstat("/home/sites", {st_mode=S_IFDIR|0771, st_size=4096, ...}) = 0 lstat("/home/sites/www.hotelgeneral.com", {st_mode=S_IFDIR| 0771, st_size=4096, ...}) = 0 lstat("/home/sites/www.hotelgeneral.com/docroot", {st_mode= S_IFDIR|0777, st_size=4096, ...}) = 0 lstat("/home/sites/www.hotelgeneral.com/docroot/shm.php", {st_mode=S_IFREG|0777, st_size=2963, ...}) = 0 chdir("/home/sites/www.hotelgeneral.com/docroot") = 0 fstat64(0x3, 0xbffff7a0) = 0 old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE| MAP_ANONYMOUS, -1, 0) = 0x40015000 read(3, "<?php\n\n\tfunction mtime()\n\t{\n\t\tre"..., 4096) = 2963 _llseek(3, 0, [0], SEEK_SET) = 0 brk(0x818e000) = 0x818e000 ioctl(3, TCGETS, 0xbfffe65c) = -1 ENOTTY (Inappropriate ioctl for device) read(3, "<?php\n\n\tfunction mtime()\n\t{\n\t\tre"..., 8192) = 2963 read(3, "", 4096) = 0 brk(0x818f000) = 0x818f000 brk(0x8190000) = 0x8190000 brk(0x8194000) = 0x8194000 read(3, "", 8192) = 0 ioctl(3, TCGETS, 0xbfffd180) = -1 ENOTTY (Inappropriate ioctl for device) close(3) = 0 munmap(0x40015000, 4096) = 0 write(1, "X-Powered-By: PHP/4.1.1", 23X-Powered-By: PHP/ 4.1.1) = 23 write(1, "\r\n", 2 ) = 2 write(1, "Content-type: text/html", 23Content-type: text/ html) = 23 write(1, "\r\n", 2 ) = 2 write(1, "\r\n", 2 ) = 2 write(1, "<P><b>Starting semaphore testing"..., 45<P><b> Starting semaphore testing...</b></p> ) = 45 semget(3811, 3, IPC_CREAT|0x1b6|0666) = 3473412 semop(3473412, 0xbfffdedc, 3) = 0 semctl(3473412, 1, GETVAL, 0xbfffde98) = 1 semctl(3473412, 0, SETVAL, 0xbfffde98) = 0 semop(3473412, 0xbfffdedc, 1) = 0 write(1, "<P><b> -->> Attempting to get a "..., 51<P><b> -- >> Attempting to get a semaphore</b></p> ) = 51 write(1, "<P><b> -->> Attempt to get a sem"..., 58<P><b> -- >> Attempt to get a semaphore succeeded</b></p> ) = 58 write(1, "<P><b> -->> Attempt to obtain a "..., 63<P><b> -- >> Attempt to obtain a shared memory segment</b></p> ) = 63 shmget(4083, 0, IPC_EXCL|0) = 1146881 shmctl(1146881, IPC_STAT, 0xbfffdec0) = 0 shmat(1146881, 0, SHM_RDONLY) = 0x40015000 write(1, "<P><b> -->> This shared memory s"..., 86<P><b> -- >> This shared memory segment already exists. opening with 'a' flag</b></p> ) = 86 shmget(4083, 0, IPC_EXCL|0) = 1146881 shmctl(1146881, IPC_STAT, 0xbfffdec0) = 0 shmat(1146881, 0, SHM_RDONLY) = 0x40016000 write(1, "<P><b> -->> Attempt to obtain a "..., 71<P><b> -- >> Attempt to obtain a shared memory segment success</b></ p> ) = 71 write(1, "<P><b> -->> Going for a semaphor"..., 55<P><b> -- >> Going for a semaphore acquisition</b></p> ) = 55 semop(3473412, 0xbfffdec8, 1) = 0 write(1, "<P><b> -->> Semaphore acquired</"..., 40<P><b> -- >> Semaphore acquired</b></p> ) = 40 write(1, "<P><b> -->> Shared mem segment s"..., 61<P><b> -- >> Shared mem segment size (in bytes): 100</b></p> ) = 61 write(1, "<P><b> -->> Starting to read tot"..., 52<P><b> -- >> Starting to read total segment</b></p> ) = 52 gettimeofday({1009843196, 627504}, NULL) = 0 lstat("/usr", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 lstat("/usr/lib", {st_mode=S_IFDIR|0755, st_size=8192, ...}) = 0 lstat("/usr/lib/gconv", {st_mode=S_IFDIR|0755, st_size= 4096, ...}) = 0 open("/usr/lib/gconv/gconv-modules", O_RDONLY) = 3 fstat64(0x3, 0xbfffc0e4) = 0 old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE| MAP_ANONYMOUS, -1, 0) = 0x40017000 read(3, "# GNU libc iconv configuration.\n"..., 4096) = 4096 read(3, "20-1969-RO//\nmodule\tJIS_C6220-19"..., 4096) = 4096 read(3, "RNAL\t\tISO8859-3\t1\nmodule\tINTERNA"..., 4096) = 4096 read(3, "SO_6937-2\t1\n\n#\tfrom\t\t\tto\t\t\tmodul"..., 4096) = 4096 brk(0x8195000) = 0x8195000 brk(0x8196000) = 0x8196000 read(3, "M256//\nmodule\tIBM256//\t\tINTERNAL"..., 4096) = 4096 brk(0x8197000) = 0x8197000 brk(0x8198000) = 0x8198000 read(3, "module\t\tcost\nalias\tCP855//\t\t\tIBM"..., 4096) = 4096 brk(0x8199000) = 0x8199000 brk(0x819a000) = 0x819a000 read(3, "IBM1004//\nalias\tOS2LATIN1//\t\tIBM"..., 4096) = 4096 brk(0x819b000) = 0x819b000 brk(0x819c000) = 0x819c000 brk(0x819d000) = 0x819d000 read(3, "_P27-1\t1\nmodule\tINTERNAL\t\tIEC_P2"..., 4096) = 4096 brk(0x819e000) = 0x819e000 brk(0x819f000) = 0x819f000 read(3, "le\tINTERNAL\t\tNATS-DANO//\t\tNATS-D"..., 4096) = 943 read(3, "", 4096) = 0 close(3) = 0 munmap(0x40017000, 4096) = 0 brk(0x81a0000) = 0x81a0000 open("/usr/lib/gconv/ISO8859-1.so", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=32197, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\ 260\7\0"..., 4096) = 4096 old_mmap(NULL, 7456, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40017000 mprotect(0x40018000, 3360, PROT_NONE) = 0 old_mmap(0x40018000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x40018000 close(3) = 0 write(1, "<P><b> -->> Reading shared memor"..., 168<P><b> - ->> Reading shared memory segment into memory --| </b></p> ) = 168 gettimeofday({1009843196, 637330}, NULL) = 0 write(1, "<P><b> -->> Geez...10177.0148131"..., 57<P><b> -- >> Geez...10177.014813107 bytes/second</b></p> ) = 57 write(1, "<P><b> -->> Writing string (\'a\')"..., 85<P><b> -->> Writing string ('a') | result is bytes written to block... --> </b></p> ) = 85 --- SIGSEGV (Segmentation fault) --- +++ killed by SIGSEGV +++ < end > =-=-=- I wouldn't even know where to wager the issue could be, though I figure it could be a kernel issue. =-=-=-= I did a GDB backtrace and found this: Program received signal SIGSEGV, Segmentation fault. 0x40103493 in memcpy (dstpp=0x40319000, srcpp=0x81ea444, len=1) at ../sysdeps/generic/memcpy.c:61 61 ../sysdeps/generic/memcpy.c: No such file or directory. That's all there was, so I don't know if this is the kernel, Apache, or PHP complaining, but I'm sure you all do. :) Any help in fixing this would be greatly appreciated! Mark J. Hershenson Director of Application Development Thinkbug Interactive, Inc. markhers@thinkbug.com PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Sun Jul 07 21:01:28 2024 UTC |
Sorry. I forgot to include the backtrace: < start > Program received signal SIGSEGV, Segmentation fault. 0x40103493 in memcpy (dstpp=0x40319000, srcpp=0x81ea42c, len=1) at ../sysdeps/generic/memcpy.c:61 61 ../sysdeps/generic/memcpy.c: No such file or directory. (gdb) bt #0 0x40103493 in memcpy (dstpp=0x40319000, srcpp= 0x81ea42c, len=1) at ../sysdeps/generic/memcpy.c:61 #1 0x40583745 in ?? () from /usr/local/apache/libexec/ libphp4.so #2 0x4053f235 in ?? () from /usr/local/apache/libexec/ libphp4.so #3 0x4054e22b in ?? () from /usr/local/apache/libexec/ libphp4.so #4 0x4055f861 in ?? () from /usr/local/apache/libexec/ libphp4.so #5 0x4055c1f2 in ?? () from /usr/local/apache/libexec/ libphp4.so #6 0x4055cb56 in ?? () from /usr/local/apache/libexec/ libphp4.so #7 0x4055cb88 in ?? () from /usr/local/apache/libexec/ libphp4.so #8 0x80550f3 in ap_invoke_handler () #9 0x8069529 in process_request_internal () #10 0x806958c in ap_process_request () #11 0x8060a6e in child_main () #12 0x8060c20 in make_child () #13 0x8060d79 in startup_children () #14 0x80613d6 in standalone_main () #15 0x8061ba3 in main () #16 0x400bb9cb in __libc_start_main (main=0x806184c <main>, argc=2, argv=0xbffffa2c, init=0x804f47c <_init>, fini=0x809858c <_fini>, rtld_fini=0x4000aea0 <_dl_fini> , stack_end=0xbffffa24) at ../sysdeps/generic/libc- start.c:92 < end > mjhBacktrace with --with-debug: ============== Program received signal SIGSEGV, Segmentation fault. 0x40103487 in memcpy (dstpp=0x4040a000, srcpp=0x81f990c, len=96) at ../sysdeps/generic/memcpy.c:55 55 ../sysdeps/generic/memcpy.c: No such file or directory. (gdb) bt #0 0x40103487 in memcpy (dstpp=0x4040a000, srcpp= 0x81f990c, len=96) at ../sysdeps/generic/memcpy.c:55 #1 0x40285c37 in zif_arsort (ht=3, return_value=0x81f96bc, this_ptr=0x0, return_value_used=1) at array.c:444 #2 0x4022df34 in execute (op_array=0x81eeb74) at ./ zend_execute.c:1799 #3 0x4024051b in zend_parse_arg_impl (arg=0x8, va=0x0, spec=0x3) at zend_API.c:387 #4 0x40252582 in php_fopen_primary_script (file_handle= 0xbffff704) at fopen_wrappers.c:305 #5 0x4024d50e in should_overwrite_per_dir_entry (orig_per_dir_entry=0x8122fec, new_per_dir_entry=0x0) at mod_php4.c:646 #6 0x4024e350 in zm_info_apache (zend_module=0x8122fec) at php_apache.c:289 #7 0x4024e3cc in zif_virtual (ht=135409644, return_value= 0x805d55c, this_ptr=0x1f4, return_value_used=23) at php_apache.c:315 #8 0x80550f3 in ap_invoke_handler () #9 0x8069529 in process_request_internal () #10 0x806958c in ap_process_request () #11 0x8060a6e in child_main () #12 0x8060c20 in make_child () #13 0x8060d79 in startup_children () #14 0x80613d6 in standalone_main () #15 0x8061ba3 in main () #16 0x400bb9cb in __libc_start_main (main=0x806184c <main>, argc=2, argv=0xbffffa1c, init=0x804f47c <_init>, fini=0x809858c <_fini>, rtld_fini=0x4000aea0 <_dl_fini> , stack_end=0xbffffa14) at ../sysdeps/generic/libc- start.c:92 =============== And it's not me who's wrapping the text...