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	        = 0x28:0xfffffe00229493f0
frame pointer	        = 0x28:0xfffffe0022949420
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		= 3649 (syz-executor.3)
trap number		= 12
panic: page fault
cpuid = 0
time = 332
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0022949050
vpanic() at vpanic+0x1e0/frame 0xfffffe00229490b0
panic() at panic+0x43/frame 0xfffffe0022949110
trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe0022949190
trap_pfault() at trap_pfault+0x9f/frame 0xfffffe0022949200
trap() at trap+0x44d/frame 0xfffffe0022949320
calltrap() at calltrap+0x8/frame 0xfffffe0022949320
--- trap 0xc, rip = 0xffffffff80e8ae7f, rsp = 0xfffffe00229493f0, rbp = 0xfffffe0022949420 ---
fifo_close() at fifo_close+0x1f/frame 0xfffffe0022949420
VOP_CLOSE_APV() at VOP_CLOSE_APV+0xc2/frame 0xfffffe0022949450
vgonel() at vgonel+0xdc/frame 0xfffffe00229494d0
vflush() at vflush+0x3df/frame 0xfffffe0022949620
ffs_flushfiles() at ffs_flushfiles+0x1eb/frame 0xfffffe0022949690
softdep_flushfiles() at softdep_flushfiles+0x105/frame 0xfffffe0022949730
ffs_unmount() at ffs_unmount+0xc1/frame 0xfffffe00229497c0
dounmount() at dounmount+0x6e8/frame 0xfffffe0022949840
vfs_unmountall() at vfs_unmountall+0x6b/frame 0xfffffe0022949870
bufshutdown() at bufshutdown+0x4d1/frame 0xfffffe00229498c0
kern_reboot() at kern_reboot+0x31e/frame 0xfffffe0022949910
sys_reboot() at sys_reboot+0x467/frame 0xfffffe0022949970
ia32_syscall() at ia32_syscall+0x452/frame 0xfffffe0022949ab0
int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0xa
KDB: enter: panic
[ thread pid 3649 tid 100288 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why