[Bug 227631] panic: vputx: usecount not zero for vnode

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227631

--- Comment #5 from emz at norma.perm.ru ---
Reproducible on r332096 with similar symptoms:

Unread portion of the kernel message buffer:
        dev zvol/data/kvm/desktop/desktop-vm393
panic: vputx: usecount not zero
cpuid = 14
KDB: stack backtrace:
#0 0xffffffff80b3a417 at kdb_backtrace+0x67
#1 0xffffffff80af4027 at vpanic+0x177
#2 0xffffffff80af3ea3 at panic+0x43
#3 0xffffffff80bb79ee at vputx+0x33e
#4 0xffffffff80bc68d5 at vn_close1+0x115
#5 0xffffffff82845554 at ctl_be_block_close+0x74
#6 0xffffffff8284988c at ctl_be_block_rm+0x14c
#7 0xffffffff8284499d at ctl_be_block_ioctl+0x7d
#8 0xffffffff82836e5f at ctl_ioctl+0x124f
#9 0xffffffff809c24a8 at devfs_ioctl_f+0x128
#10 0xffffffff80b563bd at kern_ioctl+0x26d
#11 0xffffffff80b560dc at sys_ioctl+0x15c
#12 0xffffffff80f72dc8 at amd64_syscall+0xa38
#13 0xffffffff80f5260d at fast_syscall_common+0x101
Uptime: 5m7s
Dumping 5642 out of 65385 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

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