8.0 BETA1 LOR

Glen Barber glen.j.barber at gmail.com
Mon Jul 13 21:28:07 UTC 2009


Hi, Fernando

2009/7/13 Fernando Apesteguía <fernando.apesteguia at gmail.com>:
> Hi there,
>
> I downloaded FreeBSD 8.0 in order to help testing it. I have found
> several issues. This is the first one:
>
> Jul 13 18:37:43 beastie kernel: lock order reversal:
> Jul 13 18:37:43 beastie kernel: 1st 0xffffff0007d42ba8 ufs (ufs) @
> /usr/src/sys/kern/vfs_mount.c:1199
> Jul 13 18:37:43 beastie kernel: 2nd 0xffffff002e007270 devfs (devfs) @
> /usr/src/sys/fs/msdosfs/msdosfs_vfsops.c:944
> Jul 13 18:37:43 beastie kernel: KDB: stack backtrace:
> Jul 13 18:37:43 beastie kernel: db_trace_self_wrapper() at
> db_trace_self_wrapper+0x2a
> Jul 13 18:37:43 beastie kernel: _witness_debugger() at _witness_debugger+0x2e
> Jul 13 18:37:43 beastie kernel: witness_checkorder() at witness_checkorder+0x81e
> Jul 13 18:37:43 beastie kernel: __lockmgr_args() at __lockmgr_args+0xcf3
> Jul 13 18:37:43 beastie kernel: vop_stdlock() at vop_stdlock+0x39
> Jul 13 18:37:43 beastie kernel: VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b
> Jul 13 18:37:43 beastie kernel: _vn_lock() at _vn_lock+0x47
> Jul 13 18:37:43 beastie kernel: msdosfs_sync() at msdosfs_sync+0x227
> Jul 13 18:37:43 beastie kernel: dounmount() at dounmount+0x2ca
> Jul 13 18:37:43 beastie kernel: unmount() at unmount+0x28a
> Jul 13 18:37:43 beastie kernel: syscall() at syscall+0x1af
> Jul 13 18:37:43 beastie kernel: Xfast_syscall() at Xfast_syscall+0xd0
> Jul 13 18:37:43 beastie kernel: --- syscall (22, FreeBSD ELF64,
> unmount), rip = 0x8006a09ac, rsp = 0x7fffffffdc38, rbp = 0 ---
> Jul 13 18:37:44 beastie gnome-keyring-daemon[61245]: removing
> removable location: volume_size_4144496640
>
> I got this while trying to unmount a USB device. The unmounting seemed
> to be fine, all the files were in the device and no corruption
> occurred. I found a very similar problem (maybe the same) here[1]. Any
> clues about this?
>
>
> Thanks in advance.
>
> PS: Is this the proper list for asking these questions?
>
> [1] http://forums.freebsd.org/showthread.php?p=31490

You can view reported lock order reversals here:

http://sources.zabbadoz.net/freebsd/lor.html

Questions about the -CURRENT branch should be asked on questions at .

-- 
Glen Barber


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