kern/160777: [zfs] [hang] RAID-Z3 causes fatal hang upon scrub/import on 9.0-BETA2/amd64

[3zstbn24xn at snkmail.com]

The following reply was made to PR kern/160777; it has been noted by GNATS.

From: 3zstbn24xn at snkmail.com
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: kern/160777: [zfs] [hang] RAID-Z3 causes fatal hang upon
 scrub/import on 9.0-BETA2/amd64
Date: Tue, 18 Oct 2011 19:00:58 +0000

 The following kernel trace may be of relevance (console output shown below).  I receive this on 9.0-BETA3.
 
 lock order reversal:
  1st 0xfffffe000656c278 zfs (zfs) @ /usr/src/sys/kern/vfs_vnops.c:618
  2nd 0xfffffe017795e098 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2134
 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
 __lockmgr_args() at __lockmgr_args+0x109c
 ffs_lock() at ffs_lock+0x8c
 VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b
 _vn_lock() at _vn_lock+0x47
 vget() at vget+0x7b
 vm_fault_hold() at vm_fault_hold+0x1976
 trap_pfault() at trap_pfault+0x118
 trap() at trap+0x39b
 calltrap() at calltrap+0x8
 --- trap 0xc, rip = 0xffffffff80b0aa8d, rsp = 0xffffff82331b5640, rbp = 0xffffff82331b56a0 ---
 copyin() at copyin+0x3d
 zfs_freebsd_write() at zfs_freebsd_write+0x46f
 VOP_WRITE_APV() at VOP_WRITE_APV+0x103
 vn_write() at vn_write+0x2a2
 dofilewrite() at dofilewrite+0x85
 kern_writev() at kern_writev+0x6c
 sys_write() at sys_write+0x55
 amd64_syscall() at amd64_syscall+0x3ba
 Xfast_syscall() at Xfast_syscall+0xf7
 --- syscall (4, FreeBSD ELF64, sys_write), rip = 0x80094533c, rsp = 0x7fffffffd9d8, rbp = 0x80065b000 ---