Autoloading module: intpm.ko Starting background file system checks in 60 seconds. Tue May 21 07:52 FreeBSD/amd64 (ci-freebsd-main-9.c.syzkaller.internal) (ttyu0) Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. 2019/05/21 07:53:08 parsed 1 programs 2019/05/21 07:53:08 executed programs: 0 login: interface if_tuntap.1 already present in the KLD 'kernel'! linker_load_file: /boot/kernel/if_tap.ko - unsupported file type interface if_tuntap.1 already present in the KLD 'kernel'! linker_load_file: /boot/kernel/if_tap.ko - unsupported file type interface if_tuntap.1 already present in the KLD 'kernel'! linker_load_file: /boot/kernel/if_tap.ko - unsupported file type interface if_tuntap.1 already present in the KLD 'kernel'! linker_load_file: /boot/kernel/if_tap.ko - unsupported file type panic: mtx_lock() of spin mutex (null) @ /syzkaller/managers/main/kernel/sys/kern/sys_socket.c:811 cpuid = 0 time = 1558425188 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001f886720 vpanic() at vpanic+0x1e0/frame 0xfffffe001f886780 panic() at panic+0x43/frame 0xfffffe001f8867e0 __mtx_lock_flags() at __mtx_lock_flags+0x1fd/frame 0xfffffe001f886840 soo_aio_queue() at soo_aio_queue+0xab/frame 0xfffffe001f886880 aio_aqueue() at aio_aqueue+0x75d/frame 0xfffffe001f886980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe001f886ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe001f886ab0 --- syscall (255, FreeBSD ELF64, sys_aio_read), rip = 0x20000149, rsp = 0x7fffdfffded0, rbp = 0xa --- KDB: enter: panic [ thread pid 780 tid 100109 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why