Public bug reported:
When upstart is enabled, sshd stops accepting new connections after
reloading configuration by "initctl reload ssh".
It looks like sshd is frozen with SIGSTOP after receiving SIGHUP.
[nya@sora ~]% ps auxww | grep sshd
root 10557 0.0 0.1 61364 3056 ?Ss 13:46 0:00 /usr/sbin/sshd
-D
[nya@sora ~]% sudo strace -p 10557
Process 10557 attached
select(7, [3 4], NULL, NULL, NULL^CProcess 10557 detached
[nya@sora ~]% sudo reload ssh
[nya@sora ~]% sudo strace -p 10557
Process 10557 attached
--- stopped by SIGSTOP ---
I guess it's caused by a Debian-specific patch:
debian/patches/sigstop.patch. The patch makes sshd STOP when it's ready
to start and have upstart resume it by specifying "expect stop" in
/etc/init/ssh.conf. On receiving SIGHUP sshd re-executes itself and
STOPs again, but upstart does not perform resume.
Reproduced under Ubuntu 14.04 Trusty
Package version: openssh 1:6.6p1-2
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1306877
Title:
sshd stops accepting new connections after configuration reload
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