Re: VM problem with 2.4.8-ac9 (fwd)

[ebiederm@xmission.com (Eric W. Biederman)]

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

> > Suspect code would be:
> > - tlb optimisations in recent -ac    (tasks dying with segfault)
> 
> Um the tlb optimisations go back to about 2.4.1-ac 8)
> 
> My guess would be the vm changes you and marcelo did

Can I ask which tlb optimisations these are.  I have a couple
of reports of dosemu killing the kernel on 2.4.7-ac6 and 2.4.8-ac7 and
similiar kernels, on machines with slow processors.  It has been
confirmed in dosemu without X and without any direct hardware
access. The kernel seems to oops in random interrupt handlers.  Just
off the cuff that feels like a lazy context switching bug.  As dosemu
plays with ldt's and lives in the vm86 syscall I can see it have
problems other code paths don't.

It is so weird I have been having a hard time believing the bug
reports.

Eric
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