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 = 0x20:0xffffffff81161592 stack pointer = 0x0:0xfffffe002451c5e0 frame pointer = 0x0:0xfffffe002451c6b0 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 = 2836 (syz-executor.1) trap number = 12 panic: page fault cpuid = 1 time = 1568689267 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe002451c240 vpanic() at vpanic+0x1e0/frame 0xfffffe002451c2a0 panic() at panic+0x43/frame 0xfffffe002451c300 trap_fatal() at trap_fatal+0x4de/frame 0xfffffe002451c380 trap_pfault() at trap_pfault+0x9f/frame 0xfffffe002451c3f0 trap() at trap+0x44b/frame 0xfffffe002451c510 calltrap() at calltrap+0x8/frame 0xfffffe002451c510 --- trap 0xc, rip = 0xffffffff81161592, rsp = 0xfffffe002451c5e0, rbp = 0xfffffe002451c6b0 --- uipc_send() at uipc_send+0x6d2/frame 0xfffffe002451c6b0 sosend_generic() at sosend_generic+0x747/frame 0xfffffe002451c770 sosend() at sosend+0xc6/frame 0xfffffe002451c7e0 kern_sendit() at kern_sendit+0x33d/frame 0xfffffe002451c890 freebsd32_sendmsg() at freebsd32_sendmsg+0x268/frame 0xfffffe002451c970 ia32_syscall() at ia32_syscall+0x46a/frame 0xfffffe002451cab0 int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x814301b KDB: enter: panic [ thread pid 2836 tid 100874 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why