Date: Fri, 11 Dec 2009 20:28:19 +0100 From: Stefan Bethke <stb@lassitu.de> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: panic on zfs unmount Message-ID: <36AED70D-52B8-47AD-8E6A-C21402D42151@lassitu.de>
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I still sometimes get the "lost" .zfs/snapshot directory, with resulting =
panic, and it just happened again. I have the full crash dump, if =
anyone wants to look at details.
# cd /jail/foo/.zfs
# ls
ls: snapshot: Bad file descriptor
# cd
# zfs umount tank/jail/foo
Fatal trap 12: page fault while in kernel mode
cpuid =3D 0; apic id =3D 00
fault virtual address =3D 0xa8
fault code =3D supervisor write data, page not present
instruction pointer =3D 0x20:0xffffffff8033fac5
stack pointer =3D 0x28:0xffffff80626cf9d0
frame pointer =3D 0x28:0xffffff80626cf9e0
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 38362 (zfs)
trap number =3D 12
panic: page fault
cpuid =3D 0
Uptime: 7d3h33m46s
Physical memory: 3313 MB
#0 doadump () at pcpu.h:223
223 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) #0 doadump () at pcpu.h:223
#1 0xffffffff80337bd9 in boot (howto=3D260)
at /usr/src/sys/kern/kern_shutdown.c:416
#2 0xffffffff8033802c in panic (fmt=3DVariable "fmt" is not available.
)
at /usr/src/sys/kern/kern_shutdown.c:579
#3 0xffffffff805cc2ad in trap_fatal (frame=3D0xc, eva=3DVariable "eva" =
is not available.
)
at /usr/src/sys/amd64/amd64/trap.c:857
#4 0xffffffff805cc694 in trap_pfault (frame=3D0xffffff80626cf920, =
usermode=3D0)
at /usr/src/sys/amd64/amd64/trap.c:773
#5 0xffffffff805cd06a in trap (frame=3D0xffffff80626cf920)
at /usr/src/sys/amd64/amd64/trap.c:499
#6 0xffffffff805b2943 in calltrap ()
at /usr/src/sys/amd64/amd64/exception.S:224
#7 0xffffffff8033fac5 in _sx_xlock (sx=3D0x90, opts=3D0,=20
file=3D0xffffffff80ac1d30 =
"/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs=
/zfs_ctldir.c", line=3D1349) at atomic.h:158
#8 0xffffffff80a53b85 in zfsctl_umount_snapshots (vfsp=3DVariable =
"vfsp" is not available.
)
at =
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/=
zfs_ctldir.c:1349
#9 0xffffffff80a604f9 in zfs_umount (vfsp=3D0xffffff00017518d0, =
fflag=3D0)
at =
/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/=
zfs_vfsops.c:1020
#10 0xffffffff803c080a in dounmount (mp=3D0xffffff00017518d0, flags=3D0, =
td=3DVariable "td" is not available.
)
at /usr/src/sys/kern/vfs_mount.c:1294
#11 0xffffffff803c1038 in unmount (td=3D0xffffff002ed50720,=20
uap=3D0xffffff80626cfbf0) at /usr/src/sys/kern/vfs_mount.c:1179
#12 0xffffffff805cc906 in syscall (frame=3D0xffffff80626cfc80)
at /usr/src/sys/amd64/amd64/trap.c:989
#13 0xffffffff805b2c21 in Xfast_syscall ()
at /usr/src/sys/amd64/amd64/exception.S:373
#14 0x0000000800f4ba4c in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)=20
--=20
Stefan Bethke <stb@lassitu.de> Fon +49 151 14070811
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