Re: "witness exhausted"

From: John Baldwin (jhb_at_FreeBSD.org)
Date: 08/23/04

  • Next message: Nate Lawson: "Re: suspend/resume panic in ACPI.." 
    To: freebsd-current@FreeBSD.org
Date: Mon, 23 Aug 2004 14:59:15 -0400

    On Monday 23 August 2004 02:09 pm, Robert Huff wrote:
    > I updated to
    >
    > FreeBSD 6.0-CURRENT #1: Fri Aug 20 15:02:58 EDT 2004
    >
    > and noticed in the boot messages:
    >
    > witness_get: witness exhausted
    >
    > What's going on, and is this something I need to worry about?
    > (System config file and dmesg output are appended.)

    It just means that witness' internal buffers were used up so it stopped doing
    lock order checking. You can try bumping up the constants in subr_witness.c
    that control the size of the static arrays if you need witness to work. You
    can do a 'show witness' from DDB to possibly see why it exhausted all the
    entries. It may be that some class of lock is using unique names for each
    lock and needs to use a common lock type so they all use the same witness
    structure. 

    -- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
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