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[2012-11-29 13:47 UTC] fruit dot dev at gmail dot com
Description: ------------ My worker can't work for a long period of time, because it terminates with a segfault. Jobs were added every minute with: gearman -b -f testcase_01 1010101 After 2 hours of normal working, suddenly I got the message "Failed to set exception option". This bug refers to: https://bugs.php.net/bug.php?id=63041 PECL Gearman: gearman support => enabled extension version => 1.1.0 libgearman version => 1.1.3 (Compiled with --enable-assert and --enable-debug) Default TCP Host => localhost Default TCP Port => 4730 PHP: v5.4.8 (compiled with --enable-debug) # Solution After one week of investigations, I found the problem. My gearmand server was running with "--verbose DEBUG", and in such case, it behavior is unpredictable. After I changed verbosity to INFO ("--verbose INFO") the issue disappears and my workers now works without stops. To confirm, that it not a PECL bug, I have created a simple worker on C/C++ ( http://pastie.org/5452943 ). When I start it on gearmand with verbosity DEBUG, it starts to overload gearmand server with 100% of CPU. When is start it on gearmand server with verbosity INFO, my C/C++ worker and gearmand server didn't increased more than 1-2% of CPU and works continuously. Test script: --------------- <?php function testcase (GearmanJob $job) { printf("%s: %s|%s\n", date(DATE_ISO8601), $job->unique(), $job->workload()); } $worker = new GearmanWorker(); $worker->addServer(); $worker->addFunction('testcase_01', 'testcase'); $worker->setTimeout(1000); while ($worker->work() || $worker->returnCode() == GEARMAN_TIMEOUT) { if (GEARMAN_TIMEOUT == $worker->returnCode()) continue; if (GEARMAN_SUCCESS == $worker->returnCode()) continue; printf("return code: %d\n", $worker->returnCode()); break; } Expected result: ---------------- I'm expecting to test script never stops. Actual result: -------------- Program received signal SIGSEGV, Segmentation fault. 0x0000000801e3160b in gearman_packet_free (packet=0x802466098) at libgearman/packet.cc:289 289 if (packet->universal->packet_list == packet) Current language: auto; currently c++ #0 0x0000000801e3160b in gearman_packet_free (packet=0x802466098) at libgearman/packet.cc:289 #1 0x0000000801e2af28 in gearman_connection_st::free_private_packet (this=0x802466000) at libgearman/connection.cc:338 #2 0x0000000801e34e87 in connection_loop (universal=@0x80245ac60, message=@0x7fffffffc390, check=@0x7fffffffc4e0) at libgearman/universal.cc:511 #3 0x0000000801e34f85 in gearman_request_option (universal=@0x80245ac60, option=@0x7fffffffc560) at libgearman/universal.cc:576 #4 0x0000000801e36a11 in gearman_worker_set_server_option (worker_shell=0x801a505a8, option_arg=0x801d16d3e "exceptions", option_arg_size=10) at libgearman/worker.cc:1297 #5 0x0000000801d12a2c in zif_gearman_worker_work (ht=0, return_value=0x801a4f190, return_value_ptr=0x0, this_ptr=0x801a4c390, return_value_used=1) at /usr/home/fruit/make/php-ext-gearman-1.1.0/php_gearman.c:3646 #6 0x00000000007f27dc in zend_do_fcall_common_helper_SPEC (execute_data=0x801a170d8) at zend_vm_execute.h:642 #7 0x00000000007f39b5 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x801a170d8) at zend_vm_execute.h:752 #8 0x00000000007f1001 in execute (op_array=0x801a4d170) at zend_vm_execute.h:410 #9 0x00000000007b5a4a in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/home/fruit/make/php- 5.4.8/Zend/zend.c:1309 #10 0x0000000000729f03 in php_execute_script (primary_file=0x7fffffffe660) at /usr/home/fruit/make/php-5.4.8/main/main.c:2482 #11 0x0000000000902de4 in do_cli (argc=2, argv=0x7fffffffe928) at /usr/home/fruit/make/php-5.4.8/sapi/cli/php_cli.c:988 #12 0x0000000000903c79 in main (argc=2, argv=0x7fffffffe928) at /usr/home/fruit/make/php-5.4.8/sapi/cli/php_cli.c:1364 PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Sat Dec 21 13:01:31 2024 UTC |
Same problem on Ubuntu 12.04, PHP 5.3.10, pecl gearman version 1.1.0 Worker is talking to gearmand server version 1.0.3. The worker process segfaults *significantly* more often when the gearman server is run with verbosity=DEBUG, but even with gearman server verbosity set to NOTICE, it still segfaults, but is more difficult to 'catch'. In my case the Segfault causes a loop where the PHP process consumes 100% of a single CPU core. A bit from my strace of the processes as it crashed: sendto(6, "\0REQ\0\0\0'\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12 recvfrom(6, 0x1cdc461, 8192, 16384, 0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=4, events=POLLIN}], 3, 5000) = 1 ([{fd=6, revents=POLLIN}]) recvfrom(6, "\0RES\0\0\0\n\0\0\0\0", 8192, MSG_NOSIGNAL, NULL, NULL) = 12 sendto(7, "\0REQ\0\0\0'\0\0\0\0", 12, MSG_NOSIGNAL, NULL, 0) = 12 recvfrom(7, 0x1cd7e61, 8192, 16384, 0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=7, events=POLLIN}, {fd=4, events=POLLIN}], 2, 5000) = 1 ([{fd=7, revents=POLLIN}]) recvfrom(7, "\0RES\0\0\0\n\0\0\0\0\0RES\0\0\0\n\0\0\0\0", 8192, MSG_NOSIGNAL, NULL, NULL) = 24 --- SIGSEGV (Segmentation fault) @ 0 (0) --- rt_sigreturn(0xb) = 0 --- SIGSEGV (Segmentation fault) @ 0 (0) --- rt_sigreturn(0xb) = 0