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Re: Strange hang maybe due to IP changes

From: joakim
Subject: Re: Strange hang maybe due to IP changes
Date: Mon, 11 May 2009 20:33:46 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.91 (gnu/linux)

I've been meaning to write a more thourough reply to this, but since I
never do here goes:

- there is a bug in the bugtracker for this, entered by Marcus Triska,
  and also a patch which helps to some extent.

- I get afflicted by this fearsome bug rather frequently because I
  switch IP-adresses on my laptop frequently. I havent been able to fix
  it, but I have a workaround:

  - when you get the horrbile hang, you probably have changed ip
    adresses, and you also probably have a dangling connection to some
    server. Verify this with lsof. take note which interfaces are
    dangling. for me its usualy a gnus connection to gmane.

    - lsof|grep emacs, notice:
emacs      3422    joakim   38u     IPv4     141972       0t0        TCP> (ESTABLISHED)

  - now, ifconfig local interfaces for the connection: is ger.gmane.org, so its a gnus socket. is no longer valind, eth0 dead!

then i created pseudo interfaces:
ifconfig eth0
ifconfig eth0:1

This seems to work every time so far, but you need of course adapt to
your own ip adresses.


Daniel Clemente <address@hidden> writes:

> Hi;
>   since some days my Emacs (compiled from Bazaar) hangs from time to time. It 
> seems to block on I/O so strongly that I can't even debug it with gdb, strace 
> or lsof (they block when trying to attach). A kill doesn't work, and neither 
> does kill -9 (Emacs doesn't react and stays in D status).
>   After each hang, I have noticed that my network card's IP had changed via 
> DHCP. Yes, this is absurd and I don't know how it relates to Emacs, but if I 
> run dhclient3 and wait a while (about a minute), Emacs comes to life again 
> and all the C-g I issued take effect.
>   I had IP probably until the DHCP lease expired, then it was 
> A „dhclient3“ run put it again at .123
>   At the moment of the hang, another Emacs instance where I had Gnus open 
> stopped being able to connect to the IMAP servers, maybe because the new IP 
> couldn't access Internet.
>   Versions:
> dhcp3-client                               3.1.1-5ubuntu7
> Linux CPU107 2.6.28-11-generic #36-Ubuntu SMP Fri Mar 20 19:40:40 UTC 2009 
> i686 GNU/Linux
> GNU Emacs (i686-pc-linux-gnu, GTK+ Version 2.16.0) of 2009-04-20 on 
> CPU107
>   Were there changes in network / blocking code that could have triggered 
> these behaviours?
> -- Daniel
> PS: I had recently another crash involving XftGlyphExtents/XftCharIndex but 
> this seems unrelated. I have reported the bug.
Joakim Verona

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