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Date:      Wed, 6 Jan 2010 14:04:07 +0800
From:      "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au>
To:        freebsd-current@freebsd.org
Subject:   LOR vfs_mount.c && msdosfs_vfsops.c [SEC=UNCLASSIFIED]
Message-ID:  <20100106060407.GA30135@stlux503.dsto.defence.gov.au>

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Upon exec'ing: '#sudo umount /mnt/' (/mnt is FAT32 USB stick).
Cant see anything that looks the same @
http://sources.zabbadoz.net/freebsd/lor.html

   lock order reversal:
    1st 0xc9541af8 ufs (ufs) @ /usr/src/sys/kern/vfs_mount.c:1204
    2nd 0xc7d80d18 devfs (devfs) @ /usr/src/sys/fs/msdosfs/msdosfs_vfsops.c:944
   KDB: stack backtrace:
   db_trace_self_wrapper(c0c9b289,eb3f5a34,c08d26e5,c08c339b,c0c9e192,...) at db_trace_self_wrapper+0x26
   kdb_backtrace(c08c339b,c0c9e192,c61317d8,c6131708,eb3f5a90,...) at kdb_backtrace+0x29
   _witness_debugger(c0c9e192,c7d80d18,c0c8ca59,c6131708,c0c8d23d,...) at _witness_debugger+0x25
   witness_checkorder(c7d80d18,9,c0c8d23d,3b0,c7d80d38,...) at witness_checkorder+0x839
   __lockmgr_args(c7d80d18,80400,c7d80d38,0,0,...) at __lockmgr_args+0x824
   vop_stdlock(eb3f5bac,c0f301a0,c75f10a4,80400,c7d80cc0,...) at vop_stdlock+0x62
   VOP_LOCK1_APV(c0d7e580,eb3f5bac,eb3f5bcc,c0dbe5e0,c7d80cc0,...) at
   VOP_LOCK1_APV+0xb5 _vn_lock(c7d80cc0,80400,c0c8d23d,3b0,c6798798,...) at _vn_lock+0x5e
   msdosfs_sync(c6798798,1,c0ca4bbf,4f9,80,...) at msdosfs_sync+0x29c
   dounmount(c6798798,8000000,c75f1000,47e,4,...) at dounmount+0x44e
   unmount(c75f1000,eb3f5cf8,8,c75f1000,c0d822c8,...) at unmount+0x2ff
   syscall(eb3f5d38) at syscall+0x2a3
   Xint0x80_syscall() at Xint0x80_syscall+0x20
   --- syscall (22, FreeBSD ELF32, unmount), eip = 0x280dafaf, esp = 0xbfbfe49c, ebp = 0xbfbfe568 ---

  -Alex

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