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From: Andrew Gallatin <gallatin@cs.duke.edu>
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Date: Fri, 16 Jan 2004 11:18:07 -0500 (EST)
To: Peter Losher <Peter_Losher@isc.org>
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Subject: Re: Fatal trap under heavy load on 5.1-p10...
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Peter Losher writes:
 > -----BEGIN PGP SIGNED MESSAGE-----
 > Hash: SHA1
 > 
 > After dealing w/ the traffic loads for 5.2-REL for three days, the system 
 > popped into the debugger and halted.  Here are the relevant details - If this 
 > is a known issue and fixed in 5.2, then say so... :)
 > 

The panic is in the zero-copy sockets code.  There have been many VM
system changes which may have fixed it.  Specifically, Alan Cox
improved the sf_buf system quite a bit between 5.1 and 5.2.

Can you map socow_setup+0xc9 to a source file line number in your
system please?  Do

gdb kernel.debug
<...>
(gdb) list *socow_setup+0xc9


BTW, A certain way to prevent this from ever happening is to disable
that code by removing options ZERO_COPY_SOCKETS from your kernel
config file.


Thanks,

Drew