Re: [Users] memory leak in presence module?

Hi Bogdan! I've attached with strace to all openser threads and waited for the crash. Here is the strace log of the "attendant" process (ID=0): Process 2340 attached - interrupt to quit pause() = ? ERESTARTNOHAND (To be restarted) --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) waitpid(-1, [{WIFSIGNALED(s) && WTERMSIG(s) == SIGKILL}], WNOHANG) = 2344 time([1178548261]) = 1178548261 stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=801, ...}) = 0 stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=801, ...}) = 0 stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=801, ...}) = 0 send(3, "<134>May 7 16:31:01 /usr/sbin/o"..., 86, MSG_NOSIGNAL) = 86 time([1178548262]) = 1178548262 stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=801, ...}) = 0 stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=801, ...}) = 0 stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=801, ...}) = 0 send(3, "<134>May 7 16:31:02 /usr/sbin/o"..., 69, MSG_NOSIGNAL) = 69 waitpid(-1, 0xbfd58ecc, WNOHANG) = 0 time([1178548262]) = 1178548262 stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=801, ...}) = 0 stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=801, ...}) = 0 stat64("/etc/localtime", {st_mode=S_IFREG|0644, st_size=801, ...}) = 0 send(3, "<134>May 7 16:31:02 /usr/sbin/o"..., 79, MSG_NOSIGNAL) = 79 kill(0, SIGTERM) = 0 --- SIGTERM (Terminated) @ 0 (0) --- sigreturn() = ? (mask now []) rt_sigaction(SIGALRM, {0x8067830, [ALRM], SA_RESTART}, {SIG_DFL}, 8) = 0 alarm(60) = 0 wait4(-1, NULL, 0, NULL) = 2350 --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) wait4(-1, NULL, 0, NULL) = 2345 --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) wait4(-1, NULL, 0, NULL) = 2349 --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) wait4(-1, NULL, 0, NULL) = 2341 --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) wait4(-1, NULL, 0, NULL) = 2347 --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) wait4(-1, NULL, 0, NULL) = 2346 --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) wait4(-1, NULL, 0, NULL) = 2348 --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) wait4(-1, NULL, 0, NULL) = 2342 --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) wait4(-1, NULL, 0, NULL) = ? ERESTARTSYS (To be restarted) --- SIGALRM (Alarm clock) @ 0 (0) --- kill(0, SIGKILL) = 0 +++ killed by SIGKILL +++ Process 2340 detached If I read it correct, the SIGKILL is sent by this process, after sending SIGTERM to all its childs. The SIGTERM is sent, because a child exited. But which child? And why? The openser log says: May 7 16:31:02 debian /usr/sbin/openser[2340]: child process 2344 exited by a signal 9 May 7 16:31:02 debian /usr/sbin/openser[2340]: core was not generated May 7 16:31:02 debian /usr/sbin/openser[2340]: INFO: terminating due to SIGCHLD To me this looks like 2344 (a UDP thread) exited with signal 9. Thus, the main thread receives SIGCHLD and then sends SIGTERM and afterwards SIGKILL to all other threads and itself. But why received the thread 2344 a SIGKILL and who sent the SIGKILL? I need some more debugging tips. Bogdan, you mentioned gdb - how can I debug this with gdb? regards klaus Bogdan-Andrei Iancu wrote: