Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address	= 0x0
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff80e8ae7f
stack pointer	        = 0x28:0xfffffe0028b3f400
frame pointer	        = 0x28:0xfffffe0028b3f430
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		= 7645 (syz-executor.2)
trap number		= 12
panic: page fault
cpuid = 0
time = 4197473
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0028b3f060
vpanic() at vpanic+0x1e0/frame 0xfffffe0028b3f0c0
panic() at panic+0x43/frame 0xfffffe0028b3f120
trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe0028b3f1a0
trap_pfault() at trap_pfault+0x9f/frame 0xfffffe0028b3f210
trap() at trap+0x44d/frame 0xfffffe0028b3f330
calltrap() at calltrap+0x8/frame 0xfffffe0028b3f330
--- trap 0xc, rip = 0xffffffff80e8ae7f, rsp = 0xfffffe0028b3f400, rbp = 0xfffffe0028b3f430 ---
fifo_close() at fifo_close+0x1f/frame 0xfffffe0028b3f430
VOP_CLOSE_APV() at VOP_CLOSE_APV+0xc2/frame 0xfffffe0028b3f460
vgonel() at vgonel+0xdc/frame 0xfffffe0028b3f4e0
vflush() at vflush+0x3df/frame 0xfffffe0028b3f630
ffs_flushfiles() at ffs_flushfiles+0x1eb/frame 0xfffffe0028b3f6a0
softdep_flushfiles() at softdep_flushfiles+0x105/frame 0xfffffe0028b3f740
ffs_unmount() at ffs_unmount+0xc1/frame 0xfffffe0028b3f7d0
dounmount() at dounmount+0x6e8/frame 0xfffffe0028b3f850
vfs_unmountall() at vfs_unmountall+0x6b/frame 0xfffffe0028b3f880
bufshutdown() at bufshutdown+0x4d1/frame 0xfffffe0028b3f8d0
kern_reboot() at kern_reboot+0x31e/frame 0xfffffe0028b3f920
sys_reboot() at sys_reboot+0x467/frame 0xfffffe0028b3f980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0028b3fab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0028b3fab0
--- syscall (55, FreeBSD ELF64, sys_reboot), rip = 0x20000249, rsp = 0x7fffdfffded8, rbp = 0xa ---
KDB: enter: panic
[ thread pid 7645 tid 101224 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why