>Number: 151942
>Category: kern
>Synopsis: panic during ls(1) zfs snapshot directory
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 04 17:10:05 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Kuang-che Wu
>Release: FreeBSD 9.0-CURRENT amd64
>Organization:
>Environment:
System: FreeBSD kcwu.csie.org 9.0-CURRENT FreeBSD 9.0-CURRENT #0: Sun Oct 17
05:01:33 CST 2010 [email protected]:/usr/obj/amd64.amd64/usr/src/sys/DESKTOP
amd64
>Description:
zdata is zpool v15, zfs v4
$ zpool status -v
pool: zdata
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
zdata ONLINE 0 0 0
raidz1 ONLINE 0 0 0
ad6p4 ONLINE 0 0 0
ad8p4 ONLINE 0 0 0
ad10p4 ONLINE 0 0 0
cache
ad14 ONLINE 0 0 0
$ zfs list
NAME USED AVAIL REFER MOUNTPOINT
zdata 798G 1.87T 31.3G /zdata
zdata/backup 138G 1.87T 138G /zdata/backup
zdata/files 149G 1.87T 149G /zdata/files
zdata/home 61.4G 1.87T 25.0G /home
zdata/home/kcwu 33.6G 1.87T 26.1G /home/kcwu
zdata/foo 417G 1.87T 114G /zdata/foo
zdata/foo/barrrr 117G 1.87T 101G /zdata/foo/barrrr
zdata/foo/barr 131G 1.87T 129G /zdata/foo/barr
zdata/foo/bar 55.9G 1.87T 50.8G /zdata/foo/bar
$ zfs list -t all -r zdata/foo
NAME USED AVAIL REFER
MOUNTPOINT
zdata/foo 417G 1.87T 114G
/zdata/foo
zdata/foo/barrrr 117G 1.87T 101G
/zdata/foo/barrrr
zdata/foo/bar...@2010-10-31_01.40 6.89G - 104G -
zdata/foo/bar...@2010-10-31_05.30 1.50G - 101G -
zdata/foo/bar...@2010-11-01_23.00 1.97G - 101G -
zdata/foo/bar...@2010-11-01_23.00 272M - 100G -
zdata/foo/bar...@2010-11-02_10.30 503M - 100G -
zdata/foo/bar...@2010-11-03_05.50 449M - 100G -
zdata/foo/bar...@2010-11-04_06.00 0 - 101G -
zdata/foo/barr 131G 1.87T 129G
/zdata/foo/barr
zdata/foo/b...@2010-09-28 2.41G - 128G -
zdata/foo/bar 55.9G 1.87T 50.8G
/zdata/foo/bar
zdata/foo/b...@2010-09-28 5.02G - 48.6G -
zdata/foo/b...@2010-11-03_15.30 88.0M - 50.7G -
zdata/foo/b...@2010-11-04_13.00 0 - 50.8G -
>How-To-Repeat:
$ ls /zdata/foo/barrrr/.zfs
kernel panic
(reproduce rate: 3 times out of 4)
Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 04
fault virtual address = 0x100
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff80715735
stack pointer = 0x28:0xffffff8072b0e310
frame pointer = 0x28:0xffffff8072b0e330
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 45332 (ls)
[ thread pid 45332 tid 100320 ]
Stopped at VOP_LOCK1_APV+0x35: movq 0x100(%rbx),%rax
db> bt
Tracing pid 45332 tid 100320 td 0xffffff002775e000
VOP_LOCK1_APV() at VOP_LOCK1_APV+0x35
_vn_lock() at _vn_lock+0x47
gfs_file_create() at gfs_file_create+0x65
gfs_dir_create() at gfs_dir_create+0x16
zfsctl_mknode_shares() at zfsctl_mknode_shares+0x43
gfs_dir_lookup() at gfs_dir_lookup+0x1f6
zfsctl_root_lookup() at zfsctl_root_lookup+0x11f
zfsctl_freebsd_root_lookup() at zfsctl_freebsd_root_lookup+0xa4
VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0x40
lookup() at lookup+0x452
namei() at namei+0x53a
kern_statat_vnhook() at kern_statat_vnhook+0x8f
kern_statat() at kern_statat+0x15
lstat() at lstat+0x2a
syscallenter() at syscallenter+0x2cf
syscall() at syscall+0x4b
Xfast_syscall() at Xfast_syscall+0xe2
--- syscall (190, FreeBSD ELF64, lstat), rip = 0x8009941fc, rsp =
0x7fffffffdc38, rbp = 0x800d7a590 ---
This is very similar to pr kern/150544.
However, my kernel is -current 2010/10/17 which is already including
the patches from kern/150544.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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