Public bug reported:
Binary package hint: apache2
Gutsy apache2-mpm-prefork 2.2.4-3build1
The main process running as root tries to kill of child but fails. An
strace -p of the root process shows:
wait4(13592, 0x7fff831e8c3c, WNOHANG|WSTOPPED, NULL) = 0
wait4(13593, 0x7fff831e8c3c, WNOHANG|WSTOPPED, NULL) = 0
wait4(13522, 0x7fff831e8c3c, WNOHANG|WSTOPPED, NULL) = 0
wait4(13524, 0x7fff831e8c3c, WNOHANG|WSTOPPED, NULL) = 0
wait4(13592, 0x7fff831e8c5c, WNOHANG|WSTOPPED, NULL) = 0
kill(13592, SIG_0) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({1, 0}, {1, 0}) = 0
wait4(13592, 0x7fff831e8c3c, WNOHANG|WSTOPPED, NULL) = 0
wait4(13593, 0x7fff831e8c3c, WNOHANG|WSTOPPED, NULL) = 0
wait4(13522, 0x7fff831e8c3c, WNOHANG|WSTOPPED, NULL) = 0
wait4(13524, 0x7fff831e8c3c, WNOHANG|WSTOPPED, NULL) = 0
wait4(13592, 0x7fff831e8c5c, WNOHANG|WSTOPPED, NULL) = 0
kill(13592, SIG_0) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({1, 0}, <unfinished ...>
Process 32521 detached
The child lives on:
ps aux | grep 13592
www-data 13592 0.0 1.1 347084 37144 ? S Nov09 0:00
/usr/sbin/apache2 -k start
This is a serios problem since childs never gets killed and it will take
more and more memory on the server, when more and more childs are
started and never killed off. Server listens to both 80 and 443.
** Affects: apache2 (Ubuntu)
Importance: Undecided
Status: New
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root process tries to kill child, but fails.
https://bugs.launchpad.net/bugs/175581
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