Fatal trap 12: page fault while in kernel mode cpuid = 0; apic id = 00 fault virtual address = 0x0 fault code = supervisor write data, page not present instruction pointer = 0x20:0xffffffff8112dd7a stack pointer = 0x0:0xfffffe0020e2c5f0 frame pointer = 0x0:0xfffffe0020e2c6a0 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 = 790 (syz-executor.0) trap number = 12 panic: page fault cpuid = 0 time = 1559160722 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0020e2c250 vpanic() at vpanic+0x1e0/frame 0xfffffe0020e2c2b0 panic() at panic+0x43/frame 0xfffffe0020e2c310 trap_fatal() at trap_fatal+0x4c6/frame 0xfffffe0020e2c390 trap_pfault() at trap_pfault+0x9f/frame 0xfffffe0020e2c400 trap() at trap+0x44d/frame 0xfffffe0020e2c520 calltrap() at calltrap+0x8/frame 0xfffffe0020e2c520 --- trap 0xc, rip = 0xffffffff8112dd7a, rsp = 0xfffffe0020e2c5f0, rbp = 0xfffffe0020e2c6a0 --- uipc_send() at uipc_send+0x5fa/frame 0xfffffe0020e2c6a0 sosend_generic() at sosend_generic+0x73d/frame 0xfffffe0020e2c770 sosend() at sosend+0xc6/frame 0xfffffe0020e2c7e0 kern_sendit() at kern_sendit+0x35e/frame 0xfffffe0020e2c890 freebsd32_sendmsg() at freebsd32_sendmsg+0x26b/frame 0xfffffe0020e2c970 ia32_syscall() at ia32_syscall+0x452/frame 0xfffffe0020e2cab0 int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x8142e1f KDB: enter: panic [ thread pid 790 tid 100083 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why