[tor-relays] SIGHUP causing obfs warning/disabling

[Geoff Down]

On Thu, Jan 19, 2017, at 01:14 AM, teor wrote:
> 
> > On 19 Jan 2017, at 12:00, Geoff Down <geoffdown at fastmail.net> wrote:
> > Jan 19 00:47:42.000 [notice] Tor 0.2.9.8 opening log file.
> > Jan 19 00:47:55.000 [warn] Server managed proxy encountered a method
> > error. (obfs3 Could not set up listener (0.0.0.0:xxxxx) for 'obfs3'
> > (Address already in use).)
> > Jan 19 00:47:55.000 [warn] Managed proxy at '/usr/bin/obfsproxy' failed
> > the configuration protocol and will be destroyed.
> 
> This could be a bug in tor in pt_configure_remaining_proxies(), or it
> could be a bug in obfsproxy, or it could not be a bug.
> 
> What are the ServerTransport* lines in your torrc, default torrc,
> and command-line?

In the torrc I have been using for at least a year:
ServerTransportPlugin obfs3 exec /usr/bin/obfsproxy managed
-none elsewhere. I should have said that previous (stable) versions of
tor didn't show this behaviour.

> What are the info-level log lines around the lines you quoted?
> 
> For example, do you see something like:
> Preparing managed proxy '%s' for restart.
> (If so, this could be a bug in proxy_prepare_for_restart().)
> Nothing changed for managed proxy '%s' after HUP: not restarting.
> 

I had to stop and restart tor to change log level: the same thing
happens on startup.

Jan 19 01:48:07.000 [info] launch_managed_proxy(): Managed proxy at
'/usr/bin/obfsproxy' has spawned with PID '16433'.
Jan 19 02:14:22.000 [info] notify_waitpid_callback_by_pid(): Child
process 16433 has exited; running callback.
Jan 19 02:14:23.000 [info] handle_proxy_line(): Got a line from managed
proxy '/usr/bin/obfsproxy': (VERSION 1)
Jan 19 02:14:23.000 [info] handle_proxy_line(): Got a line from managed
proxy '/usr/bin/obfsproxy': (SMETHOD-ERROR obfs3 Could not set up
listener (0.0.0.0:xxxxx) for 'obfs3' (Address already in use).)
Jan 19 02:14:23.000 [warn] Server managed proxy encountered a method
error. (obfs3 Could not set up listener (0.0.0.0:xxxxx) for 'obfs3'
(Address already in use).)
Jan 19 02:14:23.000 [warn] Managed proxy at '/usr/bin/obfsproxy' failed
the configuration protocol and will be destroyed.
Jan 19 02:14:23.000 [info] tor_process_handle_destroy(): Terminated
process with PID '16433'.

Then a HUP produced the same sequence (but a different PID), with no
sign of the lines you mention above regarding 'restart'.
The original obsfproxy process 17356 is still in the same state.

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