kern/147249: 8.0-RELEASE-p3 i386 Xen DomU filesystem "ufs vfs_lookup.c", "bufwait ffs_softdep.c" and "ufs vfs_subr.c" issue

[Yuriy Kohut]

>Number:         147249
>Category:       kern
>Synopsis:       8.0-RELEASE-p3 i386 Xen DomU filesystem "ufs vfs_lookup.c", "bufwait ffs_softdep.c" and "ufs vfs_subr.c" issue
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon May 31 15:50:01 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Yuriy Kohut
>Release:        8.0-RELEASE-p3
>Organization:
UK2
>Environment:
FreeBSD freebsd 8.0-RELEASE-p3 FreeBSD 8.0-RELEASE-p3 #1: Mon May 31 20:17:57 EEST 2010     root at fbsd.devel:/mnt/usr/src/sys/XEN  i386
>Description:
lock order reversal:
 1st 0xc27718b8 ufs (ufs) @ /usr/src/sys/kern/vfs_lookup.c:497
 2nd 0xc6836740 bufwait (bufwait) @ /usr/src/sys/ufs/ffs/ffs_softdep.c:6193
 3rd 0xc1f3e8b8 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2083
KDB: stack backtrace:
X_db_sym_numargs(c0361263,cc7ff2c8,c0119f85,c010a59b,c0364095,...) at X_db_sym_numargs+0x146
kdb_backtrace(c010a59b,c0364095,c16c86d8,c16caea8,cc7ff324,...) at kdb_backtrace+0x29
witness_display_spinlock(c0364095,c1f3e8b8,c035726b,c16caea8,c036b311,...) at witness_display_spinlock+0x75
witness_checkorder(c1f3e8b8,9,c036b311,823,0,...) at witness_checkorder+0x839
__lockmgr_args(c1f3e8b8,80100,c1f3e8d4,0,0,...) at __lockmgr_args+0x7a7
ffs_syncvnode(cc7ff434,c0119d2b,c036a7fa,80100,c1f3e860,...) at ffs_syncvnode+0x62a
VOP_LOCK1_APV(c03bae00,cc7ff434,c1812e24,c03ccfc0,c1f3e860,...) at VOP_LOCK1_APV+0xb5
_vn_lock(c1f3e860,80100,c036b311,823,4,...) at _vn_lock+0x5e
vget(c1f3e860,80100,c1812d80,50,0,...) at vget+0xb9
vfs_hash_get(c187ac94,2dbd,80000,c1812d80,cc7ff590,...) at vfs_hash_get+0xe6
ffs_vgetf(c187ac94,2dbd,80000,cc7ff590,1,...) at ffs_vgetf+0x49
softdep_sync_metadata(c2771860,0,c037d7d9,146,0,...) at softdep_sync_metadata+0x5ba
ffs_syncvnode(c2771860,1,c035c91d,c03568cf,3,...) at ffs_syncvnode+0x3e2
ffs_truncate(c2771860,200,0,880,c187eb80,...) at ffs_truncate+0x66a
ufs_direnter(c2771860,c27c153c,cc7ff8e8,cc7ffbe0,0,...) at ufs_direnter+0x8f6
ufs_itimes(cc7ffbe0,0,cc7ffacc,cc7ffa30,c033fac5,...) at ufs_itimes+0x12ac
ufs_itimes(cc7ffacc,cc7ffae4,0,0,cc7ffbb4,...) at ufs_itimes+0x1590
VOP_CREATE_APV(c03bae00,cc7ffacc,2,c0119d2b,0,...) at VOP_CREATE_APV+0xa5
vn_open_cred(cc7ffbb4,cc7ffc6c,1a4,0,c187eb80,...) at vn_open_cred+0x1d3
vn_open(cc7ffbb4,cc7ffc6c,1a4,c188abd0,cc7ffc5c,...) at vn_open+0x3b
kern_openat(c1812d80,ffffff9c,2831b3a4,0,602,...) at kern_openat+0x11f
kern_open(c1812d80,2831b3a4,0,601,1b6,...) at kern_open+0x35
open(c1812d80,cc7ffd08,c,c,c039cd0c,...) at open+0x30
syscall(cc7ffd48) at syscall+0x2a3
Xint0x80_syscall() at Xint0x80_syscall+0x22
--- syscall (5, FreeBSD ELF32, open), eip = 0x281db763, esp = 0xbf7fe46c, ebp = 0xbf7fe508 ---
>How-To-Repeat:
1. Install FreeBSD paravirtualized DomU according to the HOWTO at:
http://forums.freebsd.org/showthread.php?t=10268


2. The only difference from the original HOWTO is guest disk based on real Linux LVM volume instead of file image.


3. Xen and Dom0 details
Linux xen0.vps 2.6.18-164.15.1.el5xen #1 SMP Wed Mar 17 12:04:23 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

CentOS release 5.4 (Final)

Xen version: 3.4.2


4. Log into FreeBSd DomU via ssh and run 'sysinstall' to install ports collection.


5. Enter /usr/ports/lang/ghc and run 'make'


6. Check FreeBSD main console output
>Fix:
The issue seems to be not critical. The FreeBSD VPS is still actions as usual.

>Release-Note:
>Audit-Trail:
>Unformatted: