Warning: Permanently added '10.128.0.149' (ECDSA) to the list of known hosts. 2019/06/05 22:49:26 parsed 1 programs 2019/06/05 22:49:26 executed programs: 0 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/i386/kernel/sys/netinet/tcp_output.c:337 cpuid = 1 time = 1559774966 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0020eb8520 vpanic() at vpanic+0x1e0/frame 0xfffffe0020eb8580 panic() at panic+0x43/frame 0xfffffe0020eb85e0 __mtx_lock_flags() at __mtx_lock_flags+0x1fd/frame 0xfffffe0020eb8640 tcp_output() at tcp_output+0x5ee/frame 0xfffffe0020eb8800 tcp6_usr_connect() at tcp6_usr_connect+0x3b6/frame 0xfffffe0020eb8870 soconnectat() at soconnectat+0x183/frame 0xfffffe0020eb88d0 kern_connectat() at kern_connectat+0x1ff/frame 0xfffffe0020eb8930 sys_connect() at sys_connect+0xd9/frame 0xfffffe0020eb8970 ia32_syscall() at ia32_syscall+0x452/frame 0xfffffe0020eb8ab0 int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x814247f KDB: enter: panic [ thread pid 798 tid 100127 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why