Fatal trap 9: general protection fault while in kernel mode

[Kris Kennaway]

hammer01 died overnight with:

ad0: WARNING - READ_DMA recovered from missing interrupt


Fatal trap 9: general protection fault while in kernel mode
instruction pointer     = 0x8:0xffffffff80466d30
stack pointer           = 0x10:0xffffffff99ceaa00
frame pointer           = 0x10:0xffffffff99ceaa90
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 85568 (cc1plus)
kernel: type 9 trap, code=0
Stopped at      vm_page_splay+0x20:     decl    %eax
db> where
vm_page_splay() at vm_page_splay+0x20
vm_object_page_remove() at vm_object_page_remove+0xaa
vm_map_delete() at vm_map_delete+0x27a
vm_map_remove() at vm_map_remove+0x52
munmap() at munmap+0x9c
syscall() at syscall+0x320
Xfast_syscall() at Xfast_syscall+0xa7
--- syscall (73, FreeBSD ELF64, munmap), rip = 0x6a0dc4, rsp = 0x7fffffffebf8, rbp = 0 ---
db>

Unfortunately I don't know the timing between the ad0 error and the panic.

Kris
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