On Sat, 19 Apr 2014, R. Tyler Croy wrote:

I've noticed this as of late on my i386 -CURRENT Thinkpad T43 when I perform some file operations, but an exact reproduction case I've not yet stumbled upon:


Apr 20 01:29:32 lemon kernel: lock order reversal:
Apr 20 01:29:32 lemon kernel: 1st 0xc5832358 bufwait (bufwait) @ /usr/home/tyler/source/github/freebsd/sys/kern/vfs_bio.c:3081 Apr 20 01:29:32 lemon kernel: 2nd 0xc6f1d600 dirhash (dirhash) @ /usr/home/tyler/source/github/freebsd/sys/ufs/ufs/ufs_dirhash.c:284
[...]
Apr 20 01:29:54 lemon kernel: lock order reversal:
Apr 20 01:29:54 lemon kernel: 1st 0xc699e388 ufs (ufs) @ /usr/home/tyler/source/github/freebsd/sys/kern/vfs_subr.c:2101 Apr 20 01:29:54 lemon kernel: 2nd 0xc5859e98 bufwait (bufwait) @ /usr/home/tyler/source/github/freebsd/sys/ufs/ffs/ffs_vnops.c:262 Apr 20 01:29:54 lemon kernel: 3rd 0xc7d27c68 ufs (ufs) @ /usr/home/tyler/source/github/freebsd/sys/kern/vfs_subr.c:2101

These are "well known", #261 and #285 at http://sources.zabbadoz.net/freebsd/lor.html .

-Ben Kaduk
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