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 = 0x20:0xffffffff80e8be7f stack pointer = 0x28:0xfffffe0023394400 frame pointer = 0x28:0xfffffe0023394430 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 = 3781 (syz-executor.2) trap number = 12 panic: page fault cpuid = 0 time = 1558031464 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0023394060 vpanic() at vpanic+0x1e0/frame 0xfffffe00233940c0 panic() at panic+0x43/frame 0xfffffe0023394120 trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe00233941a0 trap_pfault() at trap_pfault+0x9f/frame 0xfffffe0023394210 trap() at trap+0x44d/frame 0xfffffe0023394330 calltrap() at calltrap+0x8/frame 0xfffffe0023394330 --- trap 0xc, rip = 0xffffffff80e8be7f, rsp = 0xfffffe0023394400, rbp = 0xfffffe0023394430 --- fifo_close() at fifo_close+0x1f/frame 0xfffffe0023394430 VOP_CLOSE_APV() at VOP_CLOSE_APV+0xc2/frame 0xfffffe0023394460 vgonel() at vgonel+0xdc/frame 0xfffffe00233944e0 vflush() at vflush+0x3df/frame 0xfffffe0023394630 ffs_flushfiles() at ffs_flushfiles+0x1eb/frame 0xfffffe00233946a0 softdep_flushfiles() at softdep_flushfiles+0x105/frame 0xfffffe0023394740 ffs_unmount() at ffs_unmount+0xc1/frame 0xfffffe00233947d0 dounmount() at dounmount+0x6e8/frame 0xfffffe0023394850 vfs_unmountall() at vfs_unmountall+0x6b/frame 0xfffffe0023394880 bufshutdown() at bufshutdown+0x4d1/frame 0xfffffe00233948d0 kern_reboot() at kern_reboot+0x31e/frame 0xfffffe0023394920 sys_reboot() at sys_reboot+0x467/frame 0xfffffe0023394980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0023394ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0023394ab0 --- syscall (55, FreeBSD ELF64, sys_reboot), rip = 0x20000189, rsp = 0x7fffdfffdee8, rbp = 0xa --- KDB: enter: panic [ thread pid 3781 tid 101116 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why