Fatal trap 12: page fault while in kernel mode cpuid = 1; apic id = 01 fault virtual address = 0x0 fault code = supervisor write data, page not present instruction pointer = 0x20:0xffffffff81160512 stack pointer = 0x0:0xfffffe001f9215d0 frame pointer = 0x0:0xfffffe001f9216a0 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 = 3766 (syz-executor.2) trap number = 12 panic: page fault cpuid = 1 time = 1566465374 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001f921230 vpanic() at vpanic+0x1e0/frame 0xfffffe001f921290 panic() at panic+0x43/frame 0xfffffe001f9212f0 trap_fatal() at trap_fatal+0x4de/frame 0xfffffe001f921370 trap_pfault() at trap_pfault+0x9f/frame 0xfffffe001f9213e0 trap() at trap+0x44d/frame 0xfffffe001f921500 calltrap() at calltrap+0x8/frame 0xfffffe001f921500 --- trap 0xc, rip = 0xffffffff81160512, rsp = 0xfffffe001f9215d0, rbp = 0xfffffe001f9216a0 --- uipc_send() at uipc_send+0x6d2/frame 0xfffffe001f9216a0 sosend_generic() at sosend_generic+0x73d/frame 0xfffffe001f921770 sosend() at sosend+0xc6/frame 0xfffffe001f9217e0 kern_sendit() at kern_sendit+0x33d/frame 0xfffffe001f921890 freebsd32_sendmsg() at freebsd32_sendmsg+0x268/frame 0xfffffe001f921970 ia32_syscall() at ia32_syscall+0x46c/frame 0xfffffe001f921ab0 int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x814301b KDB: enter: panic [ thread pid 3766 tid 100873 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why