I'm getting kernel panics everytime I try to write a file to samba share
which is a fuse mount.
I tried samba 3.0.37, 3.3.13, 3.4.8, no difference.
Tried on 8.0-RELEASE, on today's 8.1-PRERELEASE.

How to reproduce:
1. Install /usr/ports/net/samba34, /usr/ports/sysutils/fusefs-unionfs
2. Add to default samba config:
security = user
[test]
path = /test
public = yes
writeable = yes

3. unionfs -o allow_other /tmp /test
4. smbclient //IP/test
put <some file>

There we get a panic:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x0
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0x0
stack pointer           = 0x28:0xe67bbc44
frame pointer           = 0x28:0xe67bbc68
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1237 (smbd)
trap number             = 12
panic: page fault
cpuid = 1
Uptime: 14m23s
Physical memory: 1011 MB
Dumping 73 MB: 58panic: bufwrite: buffer is not busy???
cpuid = 1
  42 26 10

Reading symbols from /usr/local/modules/fuse.ko...done.
Loaded symbols for /usr/local/modules/fuse.ko
#0  doadump () at pcpu.h:246
246     pcpu.h: No such file or directory.
         in pcpu.h
(kgdb) #0  doadump () at pcpu.h:246
#1  0xc08a1d47 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:416
#2  0xc08a1fa9 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:590
#3  0xc0bd72bc in trap_fatal (frame=0xe67bbc04, eva=0)
     at /usr/src/sys/i386/i386/trap.c:938
#4  0xc0bd7540 in trap_pfault (frame=0xe67bbc04, usermode=0, eva=0)
     at /usr/src/sys/i386/i386/trap.c:851
#5  0xc0bd7e85 in trap (frame=0xe67bbc04) at
/usr/src/sys/i386/i386/trap.c:533
#6  0xc0bb9e7c in calltrap () at /usr/src/sys/i386/i386/exception.s:166
#7  0x00000000 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)

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