kern/87255: [md] ]panic] largemalloc backed mfs crashes the
kris at obsecurity.org
Fri Mar 23 19:30:08 UTC 2007
The following reply was made to PR kern/87255; it has been noted by GNATS.
From: Kris Kennaway <kris at obsecurity.org>
To: Gergely CZUCZY <phoemix at harmless.hu>
Cc: freebsd-gnats-submit at FreeBSD.org
Subject: Re: kern/87255: [md] ]panic] largemalloc backed mfs crashes the system
Date: Fri, 23 Mar 2007 15:20:15 -0400
On Fri, Mar 23, 2007 at 02:50:07PM +0000, Gergely CZUCZY wrote:
> The following reply was made to PR kern/87255; it has been noted by GNATS.
> From: Gergely CZUCZY <phoemix at harmless.hu>
> To: bug-followup at FreeBSD.org
> Subject: Re: kern/87255: [md] ]panic] largemalloc backed mfs crashes the system
> Date: Fri, 23 Mar 2007 15:12:22 +0100
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> I've just hit this issue on a 6.2-STABLE, and it's been verified on freenod=
> e/##freebsd on
> an other 6.2-STABLE.
> FreeBSD 6.2-STABLE FreeBSD 6.2-STABLE #0: Tue Feb 27 12:04:37 CET 2007 =
> toor at mort:/usr/obj/usr/src/sys/FREESBIE i386
> FreeBSD sys0 6.2-STABLE FreeBSD 6.2-STABLE #1: Web Mar 21 23:39:54 CET 2007
> how did i triggered it:
> # mdconfig -a -t malloc -s 1g
> # newfs /dev/mdX
> # mount /dev/mdX /mnt/
> # cd /usr/ && tar -czf /mnt/src.tar src
> # cd /mnt && tar -xvf src.tar
> the box has 2G of ram in it, i allocated half of that into mfs for
> some proposes. so, if i leave enough memory for the system, it still
> it crashed the system and rebooted it shortly.
Right, this is a documented limitation of malloc backing. Use swap
backing instead, it's just better.
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