Re: runit not collecting zombies

[Alex Efros <powerman@powerman.asdfGroup.com>]

Hi!

On Sat, Sep 15, 2007 at 11:20:57AM -0400, Charlie Brady wrote:
> You are running sshd with privilege separation. Process 14804 is running 
> chrooted into /var/empty. It's trying to syslog to /dev/log in the chroot, 
> and failing, then exiting. Its parent exits without doing waitpid (when it 
> gets a 0 byte read from the pipe to the child. Tell syslog to listen on 
> /var/empty/dev/log and you'll learn more.

I think this is normal ssh behaviour and doesn't related to zombie issue.
But:

# mkdir /var/empty/dev
# mount -o bind /dev/ /var/empty/dev/
# strace -f -ff -p 939 &>/tmp/ssh_strace3 &
# ssh mysql@my.host

# tail /var/log/syslog/all/current
auth.info: Sep 15 15:23:15 sshd[14925]: User mysql not allowed because account is locked
auth.info: Sep 15 15:23:15 sshd[14926]: input_userauth_request: invalid user mysql
auth.info: Sep 15 15:23:15 sshd[14926]: Connection closed by 85.90.198.1

# tail /tmp/ssh_strace3
[pid 14926] connect(6, {sa_family=AF_FILE, path="/dev/log"}, 110) = 0
[pid 14926] send(6, "<38>Sep 15 15:23:15 sshd[14926]:"..., 65, MSG_NOSIGNAL) = 65
[pid 14926] close(6)                    = 0
[pid 14926] exit_group(255)             = ?
Process 14926 detached
[pid 14925] <... read resumed> 0x5baa81ac, 4) = ? ERESTARTSYS (To be restarted)
[pid 14925] --- SIGCHLD (Child exited) @ 0 (0) ---
[pid 14925] read(6, "", 4)              = 0
[pid 14925] exit_group(255)             = ?
Process 14925 detached
<... select resumed> )                  = 1 (in [5])
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 255}], WNOHANG) = 14925
waitpid(-1, 0x5809d3ac, WNOHANG)        = 0
rt_sigaction(SIGCHLD, NULL, {0x17c5a4f0, [], 0}, 8) = 0
sigreturn()                             = ? (mask now [])
close(5)                                = 0
select(6, [3], NULL, NULL, NULL <unfinished ...>
Process 939 detached

So, only difference is successful output into log.

-- 
			WBR, Alex.