panic: vputx: missed vn_close

Hi,

I got this while building packages with poudriere. I'm running r245188.

Let me know if you need anything else from the dump.

Florian

VNASSERT failed
0xfffffe04fda5bba0: tag zfs, type VREG
    usecount 1, writecount 1, refcount 1 mountedhere 0
    flags (VI_ACTIVE)
 VI_LOCKed    v_object 0xfffffe062f6479f8 ref 0 pages 0
    lock type zfs: EXCL by thread 0xfffffe00bd683480 (pid 34602, umount,
tid 100578)
panic: vputx: missed vn_close
cpuid = 3
Uptime: 9h25m23s
Dumping 13255 out of 32647
MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

[...]

(kgdb) where
#0  doadump (textdump=1) at pcpu.h:229
#1  0xffffffff804c4ab7 in kern_reboot (howto=260) at
/usr/home/flo/dev/checkouts/svn-src/sys/kern/kern_shutdown.c:446
#2  0xffffffff804c4fc6 in vpanic (fmt=<value optimized out>, ap=<value
optimized out>) at
/usr/home/flo/dev/checkouts/svn-src/sys/kern/kern_shutdown.c:753
#3  0xffffffff804c4e56 in kassert_panic (fmt=<value optimized out>) at
/usr/home/flo/dev/checkouts/svn-src/sys/kern/kern_shutdown.c:641
#4  0xffffffff8055714d in vputx (vp=0xfffffe04fda5bba0, func=2) at
/usr/home/flo/dev/checkouts/svn-src/sys/kern/vfs_subr.c:2243
#5  0xffffffff80d6b42f in null_reclaim (ap=<value optimized out>) at
/usr/home/flo/dev/checkouts/svn-src/sys/modules/nullfs/../../fs/nullfs/null_vnops.c:743
#6  0xffffffff8070aee8 in VOP_RECLAIM_APV (vop=<value optimized out>,
a=<value optimized out>) at vnode_if.c:1959
#7  0xffffffff8055844c in vgonel (vp=0xfffffe04fda5b7c0) at vnode_if.h:830
#8  0xffffffff80557a7f in vflush (mp=0xfffffe0533ce3cc0, rootrefs=1,
flags=2, td=0xfffffe00bd683480) at
/usr/home/flo/dev/checkouts/svn-src/sys/kern/vfs_subr.c:2625
#9  0xffffffff80d6aa4e in nullfs_unmount (mp=0xfffffe0533ce3cc0,
mntflags=<value optimized out>)
    at
/usr/home/flo/dev/checkouts/svn-src/sys/modules/nullfs/../../fs/nullfs/null_vfsops.c:250
#10 0xffffffff805502cf in dounmount (mp=0xfffffe0533ce3cc0,
flags=134742016, td=<value optimized out>) at
/usr/home/flo/dev/checkouts/svn-src/sys/kern/vfs_mount.c:1314
#11 0xffffffff8054ff8b in sys_unmount (td=0xfffffe00bd683480,
uap=0xffffff90d2c87a40) at
/usr/home/flo/dev/checkouts/svn-src/sys/kern/vfs_mount.c:1211
#12 0xffffffff806b4845 in amd64_syscall (td=0xfffffe00bd683480,
traced=0) at subr_syscall.c:134
#13 0xffffffff8069d04b in Xfast_syscall () at exception.S:387
#14 0x0000000800882ffa in ?? ()
Previous frame inner to this frame (corrupt stack?)