kern/141950: [unionfs] [lor] ufs/unionfs/ufs Lock order reversal

[David Naylor]

The following reply was made to PR kern/141950; it has been noted by GNATS.

From: David Naylor <naylor.b.david at gmail.com>
To: bug-followup at freebsd.org
Cc:  
Subject: Re: kern/141950: [unionfs] [lor] ufs/unionfs/ufs Lock order reversal
Date: Wed, 10 Feb 2010 20:44:58 +0200

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 A recent -current kernel has produced a different backtrace.  I am still=20
 experiencing io freezes involving the unionfs mounts. =20
 
 lock order reversal:
  1st 0xffffff017423bbd8 unionfs (unionfs) @=20
 /usr/src/sys/modules/unionfs/../../fs/unionfs/union_subr.c:356
  2nd 0xffffff0113c2a9f8 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2204
 KDB: stack backtrace:
 db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
 _witness_debugger() at _witness_debugger+0x49
 witness_checkorder() at witness_checkorder+0x7ea
 __lockmgr_args() at __lockmgr_args+0xd43
 ffs_lock() at ffs_lock+0x8c
 VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b
 _vn_lock() at _vn_lock+0x50
 vputx() at vputx+0x285
 unionfs_noderem() at unionfs_noderem+0x1c4
 unionfs_reclaim() at unionfs_reclaim+0x11
 vgonel() at vgonel+0xf6
 vrecycle() at vrecycle+0x58
 unionfs_inactive() at unionfs_inactive+0x20
 vinactive() at vinactive+0x6b
 vputx() at vputx+0x267
 kern_mkdirat() at kern_mkdirat+0x2e7
 syscall() at syscall+0x102
 Xfast_syscall() at Xfast_syscall+0xe1
 =2D-- syscall (136, FreeBSD ELF64, mkdir), rip =3D 0x80083f8dc, rsp =3D=20
 0x7fffffffe778, rbp =3D 0x800a3a180 ---
 
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