Autoloading module: intpm.ko Starting background file system checks in 60 seconds. Wed Jun 5 03:00 FreeBSD/amd64 (ci-freebsd-i386-3.c.syzkaller.internal) (ttyu0) Warning: Permanently added '10.128.0.134' (ECDSA) to the list of known hosts. 2019/06/05 03:25:15 parsed 1 programs 2019/06/05 03:25:16 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 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 2019/06/05 03:25:21 executed programs: 1788 2019/06/05 03:25:26 executed programs: 3529 interface if_tuntap.1 already present in the KLD 'kernel'! linker_load_file: /boot/kernel/if_tap.ko - unsupported file type 2019/06/05 03:25:31 executed programs: 5136 2019/06/05 03:25:36 executed programs: 6884 2019/06/05 03:25:41 executed programs: 8632 2019/06/05 03:25:46 executed programs: 10377 2019/06/05 03:25:51 executed programs: 12037 2019/06/05 03:25:56 executed programs: 13771 2019/06/05 03:26:01 executed programs: 15397 2019/06/05 03:26:06 executed programs: 17125 panic: sx_xlock() of destroyed sx @ /syzkaller/managers/i386/kernel/sys/kern/uipc_sockbuf.c:285 cpuid = 0 time = 1559705166 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0020f265d0 vpanic() at vpanic+0x1e0/frame 0xfffffe0020f26630 panic() at panic+0x43/frame 0xfffffe0020f26690 _sx_xlock() at _sx_xlock+0x1c9/frame 0xfffffe0020f266e0 sosend_generic() at sosend_generic+0x1a0/frame 0xfffffe0020f267b0 sosend() at sosend+0xc6/frame 0xfffffe0020f26820 soo_write() at soo_write+0x61/frame 0xfffffe0020f26860 dofilewrite() at dofilewrite+0xfd/frame 0xfffffe0020f268c0 kern_writev() at kern_writev+0x66/frame 0xfffffe0020f26900 sys_write() at sys_write+0xd2/frame 0xfffffe0020f26970 ia32_syscall() at ia32_syscall+0x452/frame 0xfffffe0020f26ab0 int0x80_syscall_common() at int0x80_syscall_common+0x9c/frame 0x8143413 KDB: enter: panic [ thread pid 18578 tid 100769 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why