System lockup with SMP Kernel.

[Norman Gaywood]

On Tue, Feb 03, 2004 at 08:25:59AM +0000, WipeOut wrote:
> Hi,
> 
> I am running a P4 2.4 with HT and the SMP kernel.. Just upgraded to FC1 
> on Saturday.. All updates installed (isn't YUM great!!)..
> 
> Now for the issue..
> 
> It would appear that when running the SMP kernel the system will lockup 
> once per day, usually within the first hour or two from bootup.. I tried 
> the single proc kernel yesterday and the system was fine all day..
> 
> Anyone else having this type of issue??

For sure, I'm seeing this a lot. Perhaps there are other ways of doing
it but for me a umount seems to be good a way of triggering this problem.

On all the smp fedora systems I've tried, if I put a mount and umount
in a shell loop like this:

while [ true ]
do
  mount <something> /mnt
  umount /mnt
done

my system will die.

My systems include a quad Xeon, Duel Xeon, quad Pentium III, and a
single processor athlon running the smp kernel.

I've tried <something> as an NFS mount and an ext3 mount. I also suspect a
loop back mount will trigger it as well. Sometimes an rpm kernel install
will hang the system around the time a umount would occur (creating
the initrd).

Read the scary stories at:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=109962
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=109497

-- 
Norman Gaywood, Systems Administrator
School of Mathematics, Statistics and Computer Science
University of New England, Armidale, NSW 2351, Australia

norm at turing.une.edu.au            Phone: +61 (0)2 6773 2412
http://turing.une.edu.au/~norm    Fax:   +61 (0)2 6773 3312

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