Fatal trap 12: page fault while in kernel mode cpuid = 0; apic id = 00 fault virtual address = 0x418 fault code = supervisor read data , page not present instruction pointer = 0x20:0xffffffff8107adb8 stack pointer = 0x28:0xfffffe002125e500 frame pointer = 0x28:0xfffffe002125e5b0 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 = 822 (syz-executor.0) trap number = 12 panic: page fault cpuid = 0 time = 1553014862 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe002125e160 vpanic() at vpanic+0x1e0/frame 0xfffffe002125e1c0 panic() at panic+0x43/frame 0xfffffe002125e220 trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe002125e2a0 trap_pfault() at trap_pfault+0x9f/frame 0xfffffe002125e310 trap() at trap+0x44d/frame 0xfffffe002125e430 calltrap() at calltrap+0x8/frame 0xfffffe002125e430 --- trap 0xc, rip = 0xffffffff8107adb8, rsp = 0xfffffe002125e500, rbp = 0xfffffe002125e5b0 --- _sx_xlock_hard() at _sx_xlock_hard+0x2f8/frame 0xfffffe002125e5b0 _sx_xlock() at _sx_xlock+0x136/frame 0xfffffe002125e600 sblock() at sblock+0xeb/frame 0xfffffe002125e630 vn_sendfile() at vn_sendfile+0x650/frame 0xfffffe002125e8e0 sendfile() at sendfile+0x155/frame 0xfffffe002125e980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe002125eab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe002125eab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x412e5a, rsp = 0x7fffdffdcf38, rbp = 0x4 --- KDB: enter: panic [ thread pid 822 tid 100166 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why