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Date:      Sat, 17 Jan 2004 19:02:58 +0000
From:      Colin Percival <colin.percival@wadham.ox.ac.uk>
To:        Peter Wood <peter@alastria.net>
Cc:        freebsd-current@freebsd.org
Subject:   Re: FreeBSD 5.2R+C: panic: kmem_malloc(4096): kmem_map too small
Message-ID:  <6.0.1.1.1.20040117185104.02bd9f88@imap.sfu.ca>
In-Reply-To: <l1ri00tvjp8nn15pcsg4nurm8hmmr8m26q@4ax.com>
References:  <l1ri00tvjp8nn15pcsg4nurm8hmmr8m26q@4ax.com>

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At 17:25 17/01/2004, Peter Wood wrote:
>I have come accross a reproducable panic in bother 5.2-Release and 5.2-Current
>(as it was an hour ago). To perform this, I create two 750Mb memory disks,
>format them and mount them.

   Quote from the mdconfig(8) man page:
 >             malloc   Storage for this type of memory disk is allocated with
 >                      malloc(9).  This limits the size to the malloc bucket
 >                      limit in the kernel.  If the -o reserve option is not
 >                      set, creating and filling a large malloc-backed memory
 >                      disk is a very easy way to panic a system.

   It doesn't look like this is going to be fixed any time soon -- see the
discussion under pr kern/53350 -- so for now the answer is simply "don't do
that".

Colin Percival




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