Date: Mon, 09 Sep 2013 18:22:01 +0200 From: Andreas Longwitz <longwitz@incore.de> To: freebsd-fs@freebsd.org Subject: zfs panic during find(1) on zfs snapshot directory Message-ID: <522DF5A9.4070103@incore.de>
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Hello, I run Freebsd 8.4-Stable r253040 completed with adapted r244795,
r244925 and r245286 from head.
During an amanda backup which created the zfs snapshot
/backup/jail/db1/.zfs/snapshot/amanda-mpool_jail_db1_backup-current
the command
find /backup -name 'sysout.*' -type f -mtime +100 -exec rm {}
caused a panic on the lstat system call for the name of the snapshot
directory.
Console output:
panic: __lockmgr_args: recursing on non recursive lockmgr zfs @
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/gfs.c:451
cpuid = 2
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
kdb_backtrace() at kdb_backtrace+0x37
panic() at panic+0x1ce
__lockmgr_args() at __lockmgr_args+0xb68
vop_stdlock() at vop_stdlock+0x39
VOP_LOCK1_APV() at VOP_LOCK1_APV+0x70
_vn_lock() at _vn_lock+0x47
gfs_lookup_dot() at gfs_lookup_dot+0xa9
gfs_dir_lookup() at gfs_dir_lookup+0x49
zfsctl_snapshot_inactive() at zfsctl_snapshot_inactive+0x81
VOP_INACTIVE_APV() at VOP_INACTIVE_APV+0x68
vinactive() at vinactive+0x71
vputx() at vputx+0x2d8
traverse() at traverse+0xa3
zfsctl_snapdir_lookup() at zfsctl_snapdir_lookup+0x1bb
VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0x62
lookup() at lookup+0x44c
namei() at namei+0x53d
kern_statat_vnhook() at kern_statat_vnhook+0x8f
kern_statat() at kern_statat+0x15
lstat() at lstat+0x2a
amd64_syscall() at amd64_syscall+0x1f4
Xfast_syscall() at Xfast_syscall+0xfc
--- syscall (190, FreeBSD ELF64, lstat), rip = 0x18073597c, rsp =
0x7fffffffea68, rbp = 0x180a2d350 ---
KDB: enter: panic
0xffffff0091bf6588: tag zfs, type VDIR
usecount 5, writecount 0, refcount 5 mountedhere 0
flags ()
lock type zfs: EXCL by thread 0xffffff01aabf6470 (pid 29384)
0xffffff01940fc1d8: tag zfs, type VDIR
usecount 0, writecount 0, refcount 1 mountedhere 0
flags (VI_DOINGINACT)
lock type zfs: EXCL by thread 0xffffff01aabf6470 (pid 29384)
>From kerneldump:
(kgdb) bt
#0 doadump () at /usr/src/sys/kern/kern_shutdown.c:266
#1 0xffffffff801f87fc in db_fncall (dummy1=<value optimized out>,
dummy2=<value optimized out>, dummy3=<value optimized out>,
dummy4=<value optimized out>) at /usr/src/sys/ddb/db_command.c:548
#2 0xffffffff801f8aad in db_command (last_cmdp=0xffffffff8086bdc0,
cmd_table=<value optimized out>, dopager=0) at
/usr/src/sys/ddb/db_command.c:445
#3 0xffffffff801fd163 in db_script_exec (scriptname=0xffffff8245eeec00
"kdb.enter.panic", warnifnotfound=0) at /usr/src/sys/ddb/db_script.c:302
#4 0xffffffff801fd232 in db_script_kdbenter (eventname=<value optimized
out>) at /usr/src/sys/ddb/db_script.c:324
#5 0xffffffff801fae44 in db_trap (type=<value optimized out>,
code=<value optimized out>) at /usr/src/sys/ddb/db_main.c:230
#6 0xffffffff80432e61 in kdb_trap (type=3, code=0,
tf=0xffffff8245eeee30) at /usr/src/sys/kern/subr_kdb.c:654
#7 0xffffffff805dc82f in trap (frame=0xffffff8245eeee30) at
/usr/src/sys/amd64/amd64/trap.c:574
#8 0xffffffff805c2ba4 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:228
#9 0xffffffff804328fb in kdb_enter (why=0xffffffff8069543a "panic",
msg=0xa <Address 0xa out of bounds>) at cpufunc.h:63
#10 0xffffffff803ff367 in panic (fmt=<value optimized out>) at
/usr/src/sys/kern/kern_shutdown.c:616
#11 0xffffffff803e7df8 in __lockmgr_args (lk=0xffffff0091bf6620,
flags=0, ilk=0xffffff0091bf6648, wmesg=<value optimized out>, pri=982528,
timo=1173286416, file=0xffffffff80b68978
"/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/gfs.c",
line=451)
at /usr/src/sys/kern/kern_lock.c:704
#12 0xffffffff804833e9 in vop_stdlock (ap=<value optimized out>) at
lockmgr.h:94
#13 0xffffffff8063a870 in VOP_LOCK1_APV (vop=0xffffffff8082af60,
a=0xffffff8245eef150) at vnode_if.c:2052
#14 0xffffffff804a3137 in _vn_lock (vp=0xffffff0091bf6588, flags=525312,
file=0xffffffff80b68978
"/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/gfs.c",
line=451) at vnode_if.h:859
#15 0xffffffff80a66489 in gfs_lookup_dot (vpp=0xffffff8245eef2c8,
dvp=0xffffff0091bf6588, pvp=0xffffff0091bf6588, nm=0xffffffff80b7ab31
"..") at
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/gfs.c:451
#16 0xffffffff80a664e9 in gfs_dir_lookup (dvp=0xffffff01940fc1d8,
nm=0xffffffff80b7ab31 "..", vpp=0xffffff8245eef2c8,
cr=0xffffff01e58b6300, flags=0,
direntflags=0x0, realpnp=0x0) at
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/gfs.c:920
#17 0xffffffff80af4ad1 in zfsctl_snapshot_inactive (ap=<value optimized
out>) at
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c:1470
#18 0xffffffff80639638 in VOP_INACTIVE_APV (vop=0xffffffff80b83f60,
a=0xffffff8245eef340) at vnode_if.c:1923
#19 0xffffffff80491671 in vinactive (vp=0xffffff01940fc1d8,
td=0xffffff01aabf6470) at vnode_if.h:807
#20 0xffffffff80496038 in vputx (vp=0xffffff01940fc1d8, func=1) at
/usr/src/sys/kern/vfs_subr.c:2347
#21 0xffffffff80a63d73 in traverse (cvpp=0xffffff8245eef930,
lktype=525312) at
/usr/src/sys/modules/zfs/../../cddl/compat/opensolaris/kern/opensolaris_lookup.c:98
#22 0xffffffff80af4dbb in zfsctl_snapdir_lookup (ap=<value optimized
out>) at
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c:1007
#23 0xffffffff8063a372 in VOP_LOOKUP_APV (vop=0xffffffff80b845a0,
a=0xffffff8245eef7c0) at vnode_if.c:126
#24 0xffffffff8048898c in lookup (ndp=0xffffff8245eef900) at vnode_if.h:54
#25 0xffffffff80489b0d in namei (ndp=0xffffff8245eef900) at
/usr/src/sys/kern/vfs_lookup.c:269
#26 0xffffffff8049a47f in kern_statat_vnhook (td=0xffffff01aabf6470,
flag=<value optimized out>, fd=<value optimized out>, path=<value
optimized out>,
pathseg=<value optimized out>, sbp=0xffffff8245eefa80, hook=0) at
/usr/src/sys/kern/vfs_syscalls.c:2339
#27 0xffffffff8049a645 in kern_statat (td=<value optimized out>,
flag=<value optimized out>, fd=<value optimized out>, path=<value
optimized out>,
pathseg=<value optimized out>, sbp=<value optimized out>) at
/usr/src/sys/kern/vfs_syscalls.c:2320
#28 0xffffffff8049a70a in lstat (td=<value optimized out>,
uap=0xffffff8245eefbb0) at /usr/src/sys/kern/vfs_syscalls.c:2383
#29 0xffffffff805db824 in amd64_syscall (td=0xffffff01aabf6470,
traced=0) at subr_syscall.c:114
#30 0xffffffff805c2e9c in Xfast_syscall () at
/usr/src/sys/amd64/amd64/exception.S:387
#31 0x000000018073597c in ?? ()
(kgdb) f 25
#25 0xffffffff80489b0d in namei (ndp=0xffffff8245eef900) at
/usr/src/sys/kern/vfs_lookup.c:269
269 error = lookup(ndp);
(kgdb) l
264 VREF(dp);
265 }
266 if (vfslocked)
267 ndp->ni_cnd.cn_flags |= GIANTHELD;
268 ndp->ni_startdir = dp;
269 error = lookup(ndp);
270 if (error) {
271 uma_zfree(namei_zone, cnp->cn_pnbuf);
272 #ifdef DIAGNOSTIC
273 cnp->cn_pnbuf = NULL;
(kgdb) p *ndp
$23 = {ni_dirp = 0x180a2d3c8 <Address 0x180a2d3c8 out of bounds>,
ni_segflg = UIO_USERSPACE, ni_startdir = 0x0, ni_rootdir =
0xffffff0002c493b0, ni_topdir = 0x0, ni_dirfd = -100, ni_vp =
0xffffff01940fc1d8, ni_dvp = 0xffffff0091bf6588, ni_pathlen = 1, ni_next
= 0xffffff0026476424 "", ni_loopcnt = 0, ni_cnd = {cn_nameiop = 0,
cn_flags = 83935492, cn_thread = 0xffffff01aabf6470, cn_cred =
0xffffff01e58b6300, cn_lkflags = 2097152, cn_pnbuf = 0xffffff0026476400
"amanda-mpool_jail_db1_backup-current", cn_nameptr = 0xffffff0026476400
"amanda-mpool_jail_db1_backup-current", cn_namelen = 36, cn_consume = 0}}
I would like to know if this panic is a known issue and can give more
information from the kerneldump.
--
Andreas Longwitz
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