>Number: 144402
>Category: kern
>Synopsis: [zfs] panic at zfs_znode_dmu_init: existing znode for dbuf
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Mar 01 22:20:05 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Alex Bakhtin
>Release: 8.0-STABLE
>Organization:
>Environment:
FreeBSD tarzan-new.private.flydrag.ru 8.0-STABLE FreeBSD 8.0-STABLE #1: Sun Feb
28 18:58:11 UTC 2010
bakh...@tarzan-new.private.flydrag.ru:/zfs/obj/usr/src.old/sys/DEBUG amd64
>Description:
In pre-production testing of FreeBSD 8.0 with ZFS/raidz I found a 100%
reproducible panic in zfs. The problem was initially found after two hours of
benchmarks/dbench testing on 8.0-RELEASE. The problem was reproduced on
8.0-STABLE csuped at Feb 28, 2010.
FreeBSD 8.0-RELEASE #0: Sun Feb 28 15:40:09 UTC 2010
bakh...@tarzan-new.private.flydrag.ru:/zfs/obj/usr/src.old/sys/DEBUG
CPU: Intel(R) Pentium(R) CPU E5200 @ 2.50GHz (2536.15-MHz K8-class CPU)
real memory = 8589934592 (8192 MB)
tarzan-new# zpool status
pool: zfs
state: ONLINE
status: The pool is formatted using an older on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on older software versions.
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
zfs ONLINE 0 0 0
raidz1 ONLINE 0 0 0
ad10 ONLINE 0 0 0
ad12 ONLINE 0 0 0
ad16 ONLINE 0 0 0
errors: No known data errors
tarzan-new#
tarzan-new# zdb -vvv
zfs
version=13
name='zfs'
state=0
txg=342
pool_guid=14801748754090954299
hostid=4266611921
hostname='tarzan-new.private.flydrag.ru'
vdev_tree
type='root'
id=0
guid=14801748754090954299
children[0]
type='raidz'
id=0
guid=11719031541734505632
nparity=1
metaslab_array=23
metaslab_shift=31
ashift=9
asize=240064659456
is_log=0
children[0]
type='disk'
id=0
guid=541462146913312867
path='/dev/ad10'
whole_disk=0
children[1]
type='disk'
id=1
guid=14783639361535716946
path='/dev/ad12'
whole_disk=0
children[2]
type='disk'
id=2
guid=8087457233125113893
path='/dev/ad16'
whole_disk=0
tarzan-new#
Crash data:
60 405488 53.18 MB/sec execute 400 sec
60 405664 53.18 MB/sec execute 401 sec
panic: existing znode 0xffffff0103514468 for dbuf 0xffffff00d494ea80^M
cpuid = 1^M
KDB: enter: panic^M
[thread pid 1113 tid 100202 ]
Stopped at kdb_enter+0x3d: movq $0,0x69a270(%rip)
db:0:kdb.enter.panic> bt
Tracing pid 1113 tid 100202 td 0xffffff00196703a0
kdb_enter() at kdb_enter+0x3d
panic() at panic+0x17b
zfs_znode_dmu_init() at zfs_znode_dmu_init+0xb5
zfs_znode_alloc() at zfs_znode_alloc+0xa0
zfs_mknode() at zfs_mknode+0x204
zfs_freebsd_create() at zfs_freebsd_create+0x594
VOP_CREATE_APV() at VOP_CREATE_APV+0xb3
vn_open_cred() at vn_open_cred+0x473
kern_openat() at kern_openat+0x179
syscall() at syscall+0x118
Xfast_syscall() at Xfast_syscall+0xe1
--- syscall (5, FreeBSD ELF64, open), rip = 0x80073075c, rsp = 0x7fffffffdd98,
rbp = 0x800a05100 ---
Console logs:
http://flydrag.dyndns.org:9090/freebsd/zfs-panic/1/console.txt
crashinfo:
http://flydrag.dyndns.org:9090/freebsd/zfs-panic/1/core.txt
vmcore:
http://flydrag.dyndns.org:9090/freebsd/zfs-panic/1/vmcore.1.gz
>How-To-Repeat:
Install FreeBSD/amd64 (not tested on i386) 8.0-RELEASE, csup (optionally) to
STABLE.
Create zpool (tested on raidz1).
Install /usr/ports/benchmarks/dbench
Run dbench -t 10000 -D /zfs/bench 60
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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