Hi,
I have noticed a (new?) problem with using ssh-agent to start a session,
eg. with
ssh-agent xterm &
When the xterm (or whatever) command completes, the ssh-agent process is
still left running in the background. It should stop once its subprocess
is done.
As a simple test example, consider:
/bin/ssh-agent /bin/sleep 10
While the sleep is still running, ps shows:
PID PPID PGID WINPID TTY UID STIME COMMAND
1694 1693 1694 1576 ? 22534 00:01:10
/usr/bin/ssh-agent
1653 1 1653 11740 cons1 22534 00:00:37
/usr/bin/bash
1693 1653 1693 1552 cons1 22534 00:01:10
/usr/bin/sleep
One oddity is that ssh-agent is listed as a subprocess of sleep, not the
other way round. pstree shows this clearly:
?-+-bash---pstree
`-bash---sleep---ssh-agent
Once the sleep finishes, ps shows:
PID PPID PGID WINPID TTY UID STIME COMMAND
1694 1693 1694 1576 ? 22534 00:01:10
/usr/bin/ssh-agent
1653 1 1653 11740 cons1 22534 00:00:37
/usr/bin/bash
ie. ssh-agent is still running, though its PPID no longer exists.
I'm using the latest release versions of cygwin and openssh:
Cygwin Package Information
Package Version Status
cygwin 3.0.7-1 OK
openssh 8.0p1-2 OK
with Windows 10 1803 (2019-09 update). I use Sophos AV 10.8 with HitmanPro.
Previously, I haven't had this problem: ssh-agent stopped when it's
subprocess stopped. I updated from Cygwin 2.10-1 (and contemporaneous
openssh) fairly recently, and it's possible the problem started then. Or
it could have been a Windows minor update, AV update, or some other
setting change I made. Sorry I couldn't pin it down further.
Is it just me that sees this, or could it be a bug in ssh-agent or Cygwin?
If it is just me, my first suspicion would be HitmanPro, which
previously caused silent failures with an earlier version of Cygwin (I
reported in cygwin-patc...@cygwin.com, June 2018). That bug is fixed,
but maybe this is something new. If we can rule out a more general
Cygwin bug, I can ask my IT support to try disabling the HitmanPro to test.
Thanks,
Tim.
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