panic on zfs unmount
Stefan Bethke
stb at lassitu.de
Fri Dec 11 19:28:23 UTC 2009
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 = 0; apic id = 00
fault virtual address = 0xa8
fault code = supervisor write data, page not present
instruction pointer = 0x20:0xffffffff8033fac5
stack pointer = 0x28:0xffffff80626cf9d0
frame pointer = 0x28:0xffffff80626cf9e0
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 = 38362 (zfs)
trap number = 12
panic: page fault
cpuid = 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=260)
at /usr/src/sys/kern/kern_shutdown.c:416
#2 0xffffffff8033802c in panic (fmt=Variable "fmt" is not available.
)
at /usr/src/sys/kern/kern_shutdown.c:579
#3 0xffffffff805cc2ad in trap_fatal (frame=0xc, eva=Variable "eva" is not available.
)
at /usr/src/sys/amd64/amd64/trap.c:857
#4 0xffffffff805cc694 in trap_pfault (frame=0xffffff80626cf920, usermode=0)
at /usr/src/sys/amd64/amd64/trap.c:773
#5 0xffffffff805cd06a in trap (frame=0xffffff80626cf920)
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=0x90, opts=0,
file=0xffffffff80ac1d30 "/usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c", line=1349) at atomic.h:158
#8 0xffffffff80a53b85 in zfsctl_umount_snapshots (vfsp=Variable "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=0xffffff00017518d0, fflag=0)
at /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c:1020
#10 0xffffffff803c080a in dounmount (mp=0xffffff00017518d0, flags=0, td=Variable "td" is not available.
)
at /usr/src/sys/kern/vfs_mount.c:1294
#11 0xffffffff803c1038 in unmount (td=0xffffff002ed50720,
uap=0xffffff80626cfbf0) at /usr/src/sys/kern/vfs_mount.c:1179
#12 0xffffffff805cc906 in syscall (frame=0xffffff80626cfc80)
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)
--
Stefan Bethke <stb at lassitu.de> Fon +49 151 14070811
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