Re: kmem_malloc crashes running FreeBSD 5.2.1-RELEASE-p5

From: Kris Kennaway (
Date: 04/29/04

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    Date: Wed, 28 Apr 2004 17:01:58 -0700
    To: John Uhlig <>

    On Wed, Apr 28, 2004 at 02:40:38PM -0700, John Uhlig wrote:
    > Hi.
    > We are running FreeBSD 5.2.1-RELEASE-p5 with a fairly generic kernel on a
    > Dell PowerEdge 2650 with 1/2TB of disk RAID arrays. It recently crashed at
    > about 3AM while running the daily /etc/periodic/security/100.chksetuid
    > script.
    > I am able to crash this system at will (takes about 5-10 minutes by
    > running the
    > security scripts in a loop and using gtar to copy files to the server at
    > the same
    > time. I have included output from one core dump below. The other core dumps
    > I have so far are almost exactly the same e.g. "Error accessing memory
    > address
    > 0xf8b7983c" is the same in all core dumps so far.
    > On the web, freebsd mailing lists and bug lists, I have seen existing
    > thread about
    > "kmem_malloc and kmem_map too small" problems - but no evidence of a fix
    > or patch. We experienced the same problem running 4.9 but were able to
    > fix it
    > by setting the MAXMEM option in our kernel conf file to a value 1GB less
    > than
    > actual physical memory size. This does not help with 5.2.1-RELEASE-p5.
    > My group is under pressure to bring 3 of these servers on-line for our user
    > community by the end of the month and would greatly appreciate any help
    > in resolving this problem.

    See PR 53416. You just need to tune your kernel resource allocation
    to deal with the large amount of memory your system has.



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