kern/137852: [lor] LOR bufwait/dirhash

[Olivier Certner]

The following reply was made to PR kern/137852; it has been noted by GNATS.

From: Olivier Certner <olivier.freebsd at free.fr>
To: bug-followup at freebsd.org
Cc:  
Subject: kern/137852: [lor] LOR bufwait/dirhash
Date: Mon, 24 Jan 2011 16:11:44 +0100

 		Hi,
 
 	This LOR is still present on 9.0-CURRENT-201101. Here is the backtrace:
 
 lock order reversal:
  1st 0xffffff80f6d32ad8 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:2659
  2nd 0xfffffe0059809400 dirhash (dirhash) 
 @ /usr/src/sys/ufs/ufs/ufs_dirhash.c:284
 KDB: stack backtrace:
 db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
 kdb_backtrace() at kdb_backtrace+0x37
 _witness_debugger() at _witness_debugger+0x2e
 witness_checkorder() at witness_checkorder+0x807
 _sx_xlock() at _sx_xlock+0x55
 ufsdirhash_acquire() at ufsdirhash_acquire+0x33
 ufsdirhash_add() at ufsdirhash_add+0x19
 ufs_direnter() at ufs_direnter+0x8b4
 ufs_makeinode() at ufs_makeinode+0x250
 VOP_CREATE_APV() at VOP_CREATE_APV+0x8d
 vn_open_cred() at vn_open_cred+0x46a
 kern_openat() at kern_openat+0x181
 syscallenter() at syscallenter+0x1aa
 syscall() at syscall+0x4c
 Xfast_syscall() at Xfast_syscall+0xe2
 --- syscall (5, FreeBSD ELF64, open), rip = 0x800f6fd5c, rsp = 0x7fffffffe358, 
 rbp = 0x124 ---
 
 	Thanks,
 
 		Olivier Certner