Re: [PANIC] ufs_dirbad: bad dir

From: Kris Kennaway (kris_at_obsecurity.org)
Date: 04/29/05

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    Date: Fri, 29 Apr 2005 11:38:21 -0700
To: obrien@freebsd.org, freebsd-current@freebsd.org

    On Fri, Apr 29, 2005 at 09:02:22AM -0700, David O'Brien wrote:
    > FreeBSD 6.0-CURRENT FreeBSD 6.0-CURRENT #486: Mon Apr 25 09:41:31 PDT 2005
    >
    > [GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
    > GNU gdb 6.1.1 [FreeBSD]
    > Copyright 2004 Free Software Foundation, Inc.
    > GDB is free software, covered by the GNU General Public License, and you are
    > welcome to change it and/or distribute copies of it under certain conditions.
    > Type "show copying" to see the conditions.
    > There is absolutely no warranty for GDB. Type "show warranty" for details.
    > This GDB was configured as "i386-marcel-freebsd".
    > #0 doadump () at pcpu.h:165
    > 165 __asm __volatile("movl %%fs:0,%0" : "=r" (td));
    > (kgdb) where
    > #0 doadump () at pcpu.h:165
    > #1 0xc04dd3b2 in boot (howto=260) at ../../../kern/kern_shutdown.c:397
    > #2 0xc04dd763 in panic (fmt=0xc067b7f4 "ufs_dirbad: bad dir")
    > at ../../../kern/kern_shutdown.c:553
    > #3 0xc05d913d in ufs_dirbad (ip=0x0, offset=0, how=0x0)
    > at ../../../ufs/ufs/ufs_lookup.c:598

    This one is believed to be a long-standing bug in ufs to do with use
    of data when it is not protected by an exclusive lock.

    Kris

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