[Bug 225795] panic: found unreferenced mountpoint when accessing and unmounting snapshots in parallel

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225795

Mark Linimon  changed:

   What|Removed |Added

   Assignee|freebsd-bugs@FreeBSD.org|freebsd...@freebsd.org

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[Bug 225795] panic: found unreferenced mountpoint when accessing and unmounting snapshots in parallel

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225795

--- Comment #3 from Alan Somers  ---
Yes, my CURRENT dates from Feb-1.  Would you like me to send you my crash dump
and kernel symbol files?  They'll take around 400 MB.  Or, you could try to
reproduce it yourself.

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[Bug 225795] panic: found unreferenced mountpoint when accessing and unmounting snapshots in parallel

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225795

Andriy Gapon  changed:

   What|Removed |Added

 CC||a...@freebsd.org

--- Comment #2 from Andriy Gapon  ---
(In reply to Alan Somers from comment #0)
Have you seen this with a recent CURRENT?

I would like to have a dig at the crash dump, if possible.

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[Bug 225795] panic: found unreferenced mountpoint when accessing and unmounting snapshots in parallel

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225795

--- Comment #1 from commit-h...@freebsd.org ---
A commit references this bug:

Author: asomers
Date: Fri Feb  9 21:13:20 UTC 2018
New revision: 329083
URL: https://svnweb.freebsd.org/changeset/base/329083

Log:
  Skip snapshot_019_pos

  This test frequently panics: "panic: found unreferenced mountpoint"

  PR:   225795
  Sponsored by: Spectra Logic Corp

Changes:
  projects/zfsd/head/tests/sys/cddl/zfs/tests/snapshot/snapshot_test.sh

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[Bug 225795] panic: found unreferenced mountpoint when accessing and unmounting snapshots in parallel

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225795

Bug ID: 225795
   Summary: panic: found unreferenced mountpoint when accessing
and unmounting snapshots in parallel
   Product: Base System
   Version: CURRENT
  Hardware: Any
OS: Any
Status: New
  Severity: Affects Only Me
  Priority: ---
 Component: kern
  Assignee: freebsd-bugs@FreeBSD.org
  Reporter: asom...@freebsd.org

Found by snapshot_019_pos from the ZFS test suite:

panic: found unreferenced mountpoint
cpuid = 8
time = 1518201424
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfe00cef3f320
vpanic() at vpanic+0x18d/frame 0xfe00cef3f380
vpanic() at vpanic/frame 0xfe00cef3f400
zfsctl_snapdir_lookup() at zfsctl_snapdir_lookup+0x461/frame 0xfe00cef3f680
VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0xd3/frame 0xfe00cef3f6b0
lookup() at lookup+0x682/frame 0xfe00cef3f750
namei() at namei+0x52b/frame 0xfe00cef3f810
vn_open_cred() at vn_open_cred+0x213/frame 0xfe00cef3f950
kern_openat() at kern_openat+0x20c/frame 0xfe00cef3fac0
amd64_syscall() at amd64_syscall+0x79b/frame 0xfe00cef3fbf0
fast_syscall_common() at fast_syscall_common+0xfc/frame 0x7fffb240
Uptime: 11h59m40s
Dumping 5340 out of 49055 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

__curthread () at ./machine/pcpu.h:229
229 __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb) #0  __curthread () at ./machine/pcpu.h:229
#1  doadump (textdump=1)
at /usr/home/alans/freebsd/head/sys/kern/kern_shutdown.c:346
#2  0x80ac7042 in kern_reboot (howto=260)
at /usr/home/alans/freebsd/head/sys/kern/kern_shutdown.c:415
#3  0x80ac760d in vpanic (fmt=, ap=0xfe00cef3f3c0)
at /usr/home/alans/freebsd/head/sys/kern/kern_shutdown.c:811
#4  0x80ac7420 in kassert_panic (
fmt=0x8224ea68 "found unreferenced mountpoint")
at /usr/home/alans/freebsd/head/sys/kern/kern_shutdown.c:697
#5  0x821eae71 in zfsctl_snapdir_lookup (ap=0xfe00cef3f6f0)
at
/usr/home/alans/freebsd/head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c:893
#6  0x810f50a3 in VOP_LOOKUP_APV (vop=,
a=0xfe00cef3f6f0) at vnode_if.c:127
#7  0x80b89c92 in VOP_LOOKUP (vpp=0xfe00cef3f9c8,
cnp=0xfe00cef3f9f0, dvp=) at ./vnode_if.h:54
#8  lookup (ndp=0xfe00cef3f968)
at /usr/home/alans/freebsd/head/sys/kern/vfs_lookup.c:888
#9  0x80b8921b in namei (ndp=0xfe00cef3f968)
at /usr/home/alans/freebsd/head/sys/kern/vfs_lookup.c:450
#10 0x80ba6d13 in vn_open_cred (ndp=0xfe00cef3f968,
flagp=0xfe00cef3fa94, cmode=1, vn_open_flags=0,
cred=0xf80133087c00, fp=0xf807b332e9b0)
at /usr/home/alans/freebsd/head/sys/kern/vfs_vnops.c:279
#11 0x80b9f5ec in kern_openat (td=0xf804ca09d000, fd=-100,
path=0x800cde000 ,
pathseg=UIO_USERSPACE, flags=1179653, mode=)
at /usr/home/alans/freebsd/head/sys/kern/vfs_syscalls.c:1084
#12 0x80f7937b in syscallenter (td=0xf804ca09d000)
at
/usr/home/alans/freebsd/head/sys/amd64/amd64/../../kern/subr_syscall.c:134
#13 amd64_syscall (td=0xf804ca09d000, traced=0)
at /usr/home/alans/freebsd/head/sys/amd64/amd64/trap.c:935
#14 0x80f55e38 in fast_syscall_common ()
at /usr/home/alans/freebsd/head/sys/amd64/amd64/exception.S:468

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