beta2 panic: VAPPEND without VWRITE

[Harald Schmalzbauer]

Hello,

I got the following panic with 9.0-beta2:

cpuid = 0
KDB: enter: panic
[ thread pid 1445 tid 100126 ]
Stopped at 	kbd_enter+0x2b: movq	$0,0x918a52(%rip)
db> bt
Tracing pid 1445 tid 100126 td 0xfffffe000510d460
kdb_enter() at kbd_enter+0x3b
panic() at panic+0x180
vn_isdisk() at vn_isdisk
ufs_accessx() at ufs_accessx+0x188
vop_stdaccess() at vop_stdaccess+0x43
unionfs_access() at unionfs_access+0x1c4
vn_open_cred() at vn_open_cred+0x547
kern_opneat() at kern_openat+0x1f9
syscallenter() at syscallenter+0x1aa
syscall() at syscall+0x4c
Xfast_syscall() at Xfast_syscall+0xdd
--- syscall (5, FreeBSD ELF64, open), rip = 0x801799f2c, rsp =
0x7fffffffb388, rbp = 0x8 ---

Please tell how to provide more information if needed.

Thanks,

-Harry

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