kern/87255: Large malloc-backed mfs crashes the system

[Poul-Henning Kamp]

In message <200510111450.j9BEoLEB006718 at freefall.freebsd.org>, Yar Tikhiy write
s:
>The following reply was made to PR kern/87255; it has been noted by GNATS.
>
>From: Yar Tikhiy <yar at comp.chem.msu.su>
>To: FreeBSD-gnats-submit at FreeBSD.org
>Cc:  
>Subject: Re: kern/87255: Large malloc-backed mfs crashes the system
>Date: Tue, 11 Oct 2005 18:44:36 +0400
>
> Just for the record:
> 
> The problem seems to involve vfs-md interaction
> as filling just a bogusly large malloc-backed md
> device results in harmless ENOSPC at some point.

ENOSPC may be a problem for filesystems, try changing it to EIO and
see if they cope better with that.

In all cases it is a "don't do that then" class of problem.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.