Re: Odd NFS related SIGBUS (& possible fix)

[Benjamin Herrenschmidt]

On Fri, 2010-10-01 at 15:57 +1000, Benjamin Herrenschmidt wrote:

> I actually just reproduced the lockup on x86_64 with 4 CPUs using
> mmapstress01 -p 5 -t 1.3 -f 4096.
> 
> So the trick is to mount /tmp over nfs (so that the mmap'ed file ends up
> on nfs) and run mmapstress01 as above. Then try ctrl-C it.
> 
> I'll do a bz for that one.
> 
> I'm now going to try going back kernel versions to see if I can also
> reproduce the SIGBUS or other timing issues.

So on x86 I didn't get a backtrace, but the VGA console was still
responsive somewhat, and I saw mmapstress01 there using 100% CPU and
unresponsive to kill -9 (stays in state R).

Cheers,
Ben.


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