Warning: Permanently added '10.128.0.178' (ECDSA) to the list of known hosts. 2019/03/22 05:43:52 parsed 1 programs 2019/03/22 05:43:52 executed programs: 0 2019/03/22 05:43:57 executed programs: 24 panic: mtx_lock() of spin mutex (null) @ /syzkaller/managers/main/kernel/sys/netinet/sctputil.c:4531 cpuid = 0 time = 1553233440 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00212c2570 vpanic() at vpanic+0x1e0/frame 0xfffffe00212c25d0 panic() at panic+0x43/frame 0xfffffe00212c2630 __mtx_lock_flags() at __mtx_lock_flags+0x1fd/frame 0xfffffe00212c2690 sctp_add_to_readq() at sctp_add_to_readq+0x620/frame 0xfffffe00212c2710 sctp_ulp_notify() at sctp_ulp_notify+0xe75/frame 0xfffffe00212c2780 sctp_setopt() at sctp_setopt+0x99d0/frame 0xfffffe00212c2810 sctp_ctloutput() at sctp_ctloutput+0x214/frame 0xfffffe00212c2850 sosetopt() at sosetopt+0x101/frame 0xfffffe00212c28d0 kern_setsockopt() at kern_setsockopt+0x158/frame 0xfffffe00212c2950 sys_setsockopt() at sys_setsockopt+0x33/frame 0xfffffe00212c2980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe00212c2ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00212c2ab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x412e7a, rsp = 0x7fffdffbbf38, rbp = 0x5 --- KDB: enter: panic [ thread pid 873 tid 100240 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why db>