2.6.6 lockup

[Garrick Staples <garrick@usc.edu>]

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Hi all again,
   After fixing up the failover issues, I got my pair of Itaniums into
production with 2.6.5 and as soon as the real world load went up, the machines
started freezing.  No net response, no console, only sysreq keys work.

   I updated to 2.6.6 and it doesn't freeze up as often, but it's still really
bad, at least a few times a day.  Unfortunately, I can't seem to figure out how
to get a decent kernel trace.  Apperently sysreq-Crash doesn't work in ia64.
And NMI watchdog doesn't work on ia.  And I can't find any info on a hardware
watchdog on the mobo!

I do have some other info from sysreq on the cpu regs, memory, and processes if
anyone would find that interesting.

The work load freezes up the machines under heavy streaming writes from about a
100 processes on at least 60 clients.  A combined load of about 80GB/hour is
enough to freeze up the machine pretty regularly.

I tried Trond's 2.6.6 patches at his website, but those brokes things
considerably.  Since I don't have any actual Oops messages, anyone have any
experimental deadlock-fixing patches they want me to test? :)

-- 
Garrick Staples, Linux/HPCC Administrator
University of Southern California

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