Re: DOSEMU CVS Crash With Kernel 2.6.12

[Stas Sergeev <stsp@aknet.ru>]

Hello.

T.P. Reitzel wrote:
> Is anyone working on the source of this crash?
Not really. It doesn't look like
this problem is reproduceable, so,
as Bart already said, you should
move it to BTS.
I only committed the patch few days
ago that repairs the $_mapping option,
so that you can try $_mapping="mapfile"
and $_mapping="mapashm" and see if it
makes any difference, but this is
pretty much all that was done.

It looks like the kernel was not able
to commit the 1Mb of memory needed to
emulate the DOS address space, and sent
a SIGBUS to dosemu to notify about that.
This can happen if dosemu failed to
resize the backing-store, but it checks
the return value of ftruncate, so this
shouldn't be the case (or maybe it is
better to ftruncate() before unlink()?).
Or maybe you somehow ran OOM, make sure
the overcommit is disabled in
/proc/sys/vm/overcommit_memory
Or maybe it is a kernel bug - try -mm
patch then.
Anyway, this bug is not for the on-list
resolution.