segfault in process_info ------------------------ Key: MODCLUSTER-622 URL: https://issues.jboss.org/browse/MODCLUSTER-622 Project: mod_cluster Issue Type: Bug Components: Native (httpd modules) Affects Versions: 1.2.13.Final Environment: see the private comment Reporter: Hisanobu Okuda Assignee: Jean-Frederic Clere Segfault occured at process_info. {code} (gdb) bt #0 process_info (r=0x7f01039b7088, errtype=<value optimized out>) at mod_manager.c:1150 #1 0x00007f00fd15b44a in manager_handler (r=0x7f01039b7088) at mod_manager.c:2705 #2 0x00007f0102927640 in ap_run_handler (r=0x7f01039b7088) at /usr/src/debug/httpd-2.2.15/server/config.c:158 #3 0x00007f010292aefe in ap_invoke_handler (r=0x7f01039b7088) at /usr/src/debug/httpd-2.2.15/server/config.c:376 #4 0x00007f0102936300 in ap_process_request (r=0x7f01039b7088) at /usr/src/debug/httpd-2.2.15/modules/http/http_request.c:282 #5 0x00007f0102933178 in ap_process_http_connection (c=0x7f00f00ebba0) at /usr/src/debug/httpd-2.2.15/modules/http/http_core.c:190 #6 0x00007f010292f148 in ap_run_process_connection (c=0x7f00f00ebba0) at /usr/src/debug/httpd-2.2.15/server/connection.c:43 #7 0x00007f010293c052 in process_socket (thd=0x7f010393a1b0, dummy=<value optimized out>) at /usr/src/debug/httpd-2.2.15/server/mpm/worker/worker.c:544 #8 worker_thread (thd=0x7f010393a1b0, dummy=<value optimized out>) at /usr/src/debug/httpd-2.2.15/server/mpm/worker/worker.c:894 #9 0x00007f01011d19d1 in ?? () #10 0x00007f00d8dda700 in ?? () #11 0x0000000000000000 in ?? () {code} {code} (gdb) disassemble ... 0x00007f00fd1558f4 <+452>: mov 0x58(%rsp),%rax 0x00007f00fd1558f9 <+457>: lea 0x82f0(%rip),%rsi # 0x7f00fd15dbf0 0x00007f00fd155900 <+464>: mov %r13,%rdi 0x00007f00fd155903 <+467>: add 0x138(%rax),%rax => 0x00007f00fd15590a <+474>: mov 0xc0(%rax),%r9 {code} {code} (gdb) x/gx $rsp+0x58 0x7f00d8dd9b98: 0x00007f01028d4e60 (gdb) x/gx 0x00007f01028d4e60+0x138 0x7f01028d4f98: 0x0000000000000140 (gdb) print/x 0x00007f01028d4e60+0x140 $1 = 0x7f01028d4fa0 (gdb) # therefore, rax should be 0x7f01028d4fa0, but in fact: (gdb) info registers rax rax 0xfe01a299c750 279282976409424 (gdb) {code} It looks occurring under race condition.