Bug #11346 Updated: infinite loop in "php_request_shutdown"

ID: 11346 User updated by: rachit@ensim.com Reported By: rachit@ensim.com Status: Closed Bug Type: Scripting Engine problem Operating System: Linux PHP Version: 4.0.4pl1 New Comment: just so you know, when php4.0.6 came out, I upgraded our environment and we haven't seen the problem since Previous Comments: ------------------------------------------------------------------------ [2001-06-23 00:16:31] sniper@php.net This should be fixed in PHP 4.0.6. Reopen if it doesn't work either. ------------------------------------------------------------------------ [2001-06-08 14:22:54] sniper@php.net Please try latest RC from: http://www.php.net/~andi/php-4.0.6RC3.tar.gz --Jani ------------------------------------------------------------------------ [2001-06-08 01:11:00] rachit@ensim.com Note: I dunno what catogory this bug falls under, so i put it under general issues. This problem cannot be reproduced reliably and I have no idea what triggers it. I've had it happen once on Friday, and it happened again today (Thursday). Basically, I was clicking around developing my php application, and then I realize that things begin to get really slow. I run top and walla 5 httpd processes taking up the CPU (one of them I'm tracing via GDB): ---------- 6:27am up 31 days, 6:45, 12 users, load average: 4.05, 4.10, 4.17 134 processes: 126 sleeping, 6 running, 1 zombie, 1 stopped CPU states: 98.0% user, 1.9% system, 0.0% nice, 0.0% idle Mem: 128012K av, 121620K used, 6392K free, 23716K shrd, 2628K buff Swap: 610428K av, 21368K used, 589060K free 14540K cached PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND 12955 nobody 20 0 5492 5320 588 R 0 26.4 4.1 191:39 httpd 12963 nobody 17 0 5800 5628 584 R 0 25.4 4.3 191:50 httpd 12960 nobody 11 0 5800 5628 588 R 0 24.2 4.3 191:30 httpd 12957 nobody 11 0 5892 5720 588 R 0 21.7 4.4 193:17 httpd 2828 build 4 0 572 572 304 R 0 2.1 0.4 3:36 top 1 root 0 0 124 72 52 S 0 0.0 0.0 0:03 init -------------- One thing to note was the first time I had this problem, only one httpd process was going bonkers. Anyways, I did the customary checks of logs, etc. Nothing seemed relavent there except for 4 lines in error_log: <b>Fatal error</b>: Maximum execution time of 30 seconds exceeded in <b>Unknown</b> on line <b>0</b><br> I dunno whether that could be relavent or just coincedence because part of my development, I was doing a execs on long-running calls (just for the record, doing a while(1) or exec(sleep 100) prints that error onto the log, but does not cause httpd to spin). Check of /proc/*/fd/* denotes no extra file descriptors are open other than the customary httpd fds, except one of the processes has a socket under close_wait to my postgres database. I doubt this is relavant, because the first time i ran into the problem, I had nothing open to postgres. Anyways, I gdbed into it and did a bt: ----------- 0x400f6008 in chunk_free (ar_ptr=0x4018a040, p=0x825f0c8) at malloc.c:3057 3057 malloc.c: No such file or directory. (gdb) bt #0 0x400f6008 in chunk_free (ar_ptr=0x4018a040, p=0x825f0c8) at malloc.c:3057 #1 0x400f5d75 in __libc_free (mem=0x825f148) at malloc.c:2959 #2 0x402cacb8 in _efree () from /usr/lib/apache/libphp4.so #3 0x402f50d6 in zend_hash_destroy () from /usr/lib/apache/libphp4.so #4 0x402cb7d4 in shutdown_compiler () from /usr/lib/apache/libphp4.so #5 0x402f0fc1 in zend_deactivate () from /usr/lib/apache/libphp4.so #6 0x40302d7a in php_request_shutdown () from /usr/lib/apache/libphp4.so #7 0x40300675 in php_apache_request_shutdown () from /usr/lib/apache/libphp4.so #8 0x8051a2e in ap_run_cleanup () #9 0x805024d in ap_clear_pool () #10 0x80502c1 in ap_destroy_pool () #11 0x805023c in ap_clear_pool () #12 0x805fa5f in ap_child_terminate () #13 0x80600cc in ap_child_terminate () #14 0x8060179 in ap_child_terminate () #15 0x80607a6 in ap_child_terminate () #16 0x8060f39 in main () #17 0x400b51eb in __libc_start_main (main=0x8060bec <main>, argc=2, argv=0xbffffd84, init=0x804f1c8 <_init>, fini=0x80903ec <_fini>, rtld_fini=0x4000a610 <_dl_fini>, stack_end=0xbffffd7c) at ../sysdeps/generic/libc-start.c:90 (gdb) n ------------- Hope that helps someone. Also, I did a couple searches on deja (which should search all the mailinglists / newsgrups) for request_shutdown , and turned out with this match: http://groups.google.com/groups?q=request_shutdown&hl=en&lr=&safe=off&rnum=3&ic=1&selm=881u57%247qm%241%40FreeBSD.csie.NCTU.edu.tw Which shows someone checked in a patch into CVS already for this on Feb 11th. However, a look at the source for 4.04p1 or 4.05 shows that the patch is no longer there. I didn't go poking around the CVS logs (its too long) to find out what happened there. Anyways, I right now have this box in this state and I can do whatever you want to it, but I can't keep it like this forever. Drop me an email if you want more info (do it soon if you want me to poke around the messed up process more). -rchit ------------------------------------------------------------------------ Edit this bug report at http://bugs.php.net/?id=11346&edit=1