Hi,
While trying to troubleshoot some uwsgi problem I noticed that uwsgi
1.4.6 does not reap/respawn after exiting from strace session (strace
with master PID). Later it's not possible to stop it in the usual way:
I have to use KILL signal. Sample session:
write(2, "Fri Mar 1 13:08:55 2013 - Respa"..., 69) = 69
wait4(-1, 0x7fffdaeab4b8, WNOHANG, NULL) = 0
epoll_wait(225, {}, 1, 1000) = 0
lseek(2, 0, SEEK_CUR) = 3978138
wait4(-1, 0x7fffdaeab4b8, WNOHANG, NULL) = 0
epoll_wait(225, {}, 1, 1000) = 0
lseek(2, 0, SEEK_CUR) = 3978138
wait4(-1, 0x7fffdaeab4b8, WNOHANG, NULL) = 0
epoll_wait(225, 7fffdaeab410, 1, 1000) = -1 EINTR (Interrupted system call)
--- SIGCHLD (Child exited) @ 0 (0) ---
wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WNOHANG, NULL) = 11519
rt_sigaction(SIGPIPE, {0x1, [], SA_RESTORER, 0x34e900e7c0}, {0x1, [],
SA_RESTORER, 0x34e900e7c0}, 8) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0x2b8ea6a62650) = 11841
rt_sigaction(SIGPIPE, {0x1, [], SA_RESTORER, 0x34e900e7c0}, NULL, 8) = 0
write(2, "Fri Mar 1 13:08:57 2013 - Respa"..., 70) = 70
wait4(-1, 0x7fffdaeab4b8, WNOHANG, NULL) = 0
epoll_wait(225, <unfinished ...>
strace: ptrace(PTRACE_CONT,1,133): Input/output error
Process 11506 detached
Then we see quite some of these:
nobody 11510 11506 0 13:08 ? 00:00:00 [uwsgi] <defunct>
nobody 11512 11506 0 13:08 ? 00:00:00 [uwsgi] <defunct>
...
and logs show only:
Fri Mar 1 13:09:24 2013 - *** psgix.harakiri.commit requested ***
Fri Mar 1 13:09:24 2013 - ...The work of process 11516 is done. Seeya!
Fri Mar 1 13:09:27 2013 - *** psgix.harakiri.commit requested ***
Fri Mar 1 13:09:27 2013 - ...The work of process 11515 is done. Seeya!
Fri Mar 1 13:09:29 2013 - *** psgix.harakiri.commit requested ***
Fri Mar 1 13:09:29 2013 - ...The work of process 11514 is done. Seeya!
Fri Mar 1 13:09:32 2013 - *** psgix.harakiri.commit requested ***
Fri Mar 1 13:09:32 2013 - ...The work of process 11512 is done. Seeya!
Fri Mar 1 13:09:34 2013 - *** psgix.harakiri.commit requested ***
Fri Mar 1 13:09:34 2013 - ...The work of process 11510 is done. Seeya!
In our case we trigger harakiri from app itself.
Marcin
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