Autoloading module: intpm.ko Starting background file system checks in 60 seconds. Tue Jun 4 15:48 FreeBSD/amd64 (ci-freebsd-main-9.c.syzkaller.internal) (ttyu0) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. 2019/06/04 15:49:57 parsed 1 programs 2019/06/04 15:49:57 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 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 interface if_tuntap.1 already present in the KLD 'kernel'! linker_load_file: /boot/kernel/if_tap.ko - unsupported file type panic: sx lock still held cpuid = 0 time = 1559663397 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001f6b3760 vpanic() at vpanic+0x1e0/frame 0xfffffe001f6b37c0 panic() at panic+0x43/frame 0xfffffe001f6b3820 sx_destroy() at sx_destroy+0x5e/frame 0xfffffe001f6b3840 solisten_proto() at solisten_proto+0xd2/frame 0xfffffe001f6b38a0 tcp_usr_listen() at tcp_usr_listen+0x188/frame 0xfffffe001f6b3900 solisten() at solisten+0x7a/frame 0xfffffe001f6b3940 kern_listen() at kern_listen+0x132/frame 0xfffffe001f6b3980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe001f6b3ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe001f6b3ab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x41311a, rsp = 0x7fffdfffdf38, rbp = 0x2 --- KDB: enter: panic [ thread pid 789 tid 100110 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why