pidgin and VPN issues.

[Richard Allen]

Hello all,

For some reason this has been happening much less frequently the last couple of weeks.  But I did see this just a few minutes ago.
The UI gets complete frozen, but it does continue to update itself when I pull a chat window to the forground from behind another window.   It prints out no new messages or does not accept input.   I cant even select contacts in the buddy list.

I dont know how long pidgin had been frozen but I did start trying to debug.  I first attached a strace to the process:

[ra at hamburger ~]$ ps -ef | grep pidgin
ra        2694  2267  0 01:14 ?        00:05:53 pidgin

[ra at hamburger ~]$ strace -p 2694
Process 2694 attached
sendto(19, "\241h\366\223\272\251\21\23\255\26l9\370p\255\300\214\376\322y\221k\341\3507\16\202\200}~%\301"...
, 679, 0, NULL, 0) = -1 EAGAIN (Resource temporarily unavailable)
sendto(19, "\241h\366\223\272\251\21\23\255\26l9\370p\255\300\214\376\322y\221k\341\3507\16\202\200}~%\301"...
, 679, 0, NULL, 0) = -1 EAGAIN (Resource temporarily unavailable)
sendto(19, "\241h\366\223\272\251\21\23\255\26l9\370p\255\300\214\376\322y\221k\341\3507\16\202\200}~%\301"...
, 679, 0, NULL, 0) = -1 EAGAIN (Resource temporarily unavailable)
sendto(19, "\241h\366\223\272\251\21\23\255\26l9\370p\255\300\214\376\322y\221k\341\3507\16\202\200}~%\301"...
, 679, 0, NULL, 0) = -1 EAGAIN (Resource temporarily unavailable)
sendto(19, "\241h\366\223\272\251\21\23\255\26l9\370p\255\300\214\376\322y\221k\341\3507\16\202\200}~%\301"...
, 679, 0, NULL, 0) = -1 EAGAIN (Resource temporarily unavailable)
sendto(19, "\241h\366\223\272\251\21\23\255\26l9\370p\255\300\214\376\322y\221k\341\3507\16\202\200}~%\301"...
, 679, 0, NULL, 0) = -1 EAGAIN (Resource temporarily unavailable)
sendto(19, "\241h\366\223\272\251\21\23\255\26l9\370p\255\300\214\376\322y\221k\341\3507\16\202\200}~%\301"...
, 679, 0, NULL, 0) = -1 EAGAIN (Resource temporarily unavailable)
sendto(19, "\241h\366\223\272\251\21\23\255\26l9\370p\255\300\214\376\322y\221k\341\3507\16\202\200}~%\301"...
, 679, 0, NULL, 0) = -1 EAGAIN (Resource temporarily unavailable)


Huge, endless list of that..


[ra at hamburger ~]$ ll /proc/2694/fd/19 
l-wx------. 1 ra ra 64 May 11 01:14 /proc/2694/fd/19 -> /home/ra/.purple/logs/sipe/ra at ok.is%2cok%5cra/.system/2013-05-11.125047+0000GMT.txt


I then tried to attach gdb to the process but gdb told me I needed the debuginfo packages (I'm a Fedora user) so I disconnected gdb and installed the needed packages.
This is where a miracle happened.    pidgin recovered from the infinite loop and proceeded working as normal.
I am however ready to hook up gdb the next time this happens.

--
Rikki

----- Original Message -----
From: "Ethan Blanton" <elb at pidgin.im>
To: "Matthias Apitz" <guru at unixarea.de>
Cc: support at pidgin.im
Sent: Thursday, 18 April, 2013 2:29:13 PM
Subject: Re: pidgin and VPN issues.

Matthias Apitz spake unto us the following wisdom:
> IMHO this sounds like established TCP connections are terminated by the
> VPN down/change and some layer in pidgin is waiting (for ever) for a
> response. One could watch with TCPDUMP if this is true.

All of our network I/O should be nonblocking, and thus should not
affect the UI.  This is more likely a logic bug of some kind, as Mark
noted.

Ethan

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