Strange hang maybe due to IP changes

[Daniel Clemente]

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 192.168.5.123 probably until the DHCP lease expired, then it was 
192.168.5.190. 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 23.0.92.3 (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.