Autoloading module: intpm.ko Starting background file system checks in 60 seconds. Fri Apr 12 08:15 FreeBSD/amd64 (ci-freebsd-main-4.c.syzkaller.internal) (ttyu0) Warning: Permanently added '10.128.1.50' (ECDSA) to the list of known hosts. 2019/04/12 08:15:24 parsed 1 programs 2019/04/12 08:15:24 executed programs: 0 login: panic: sx lock still held cpuid = 1 time = 1555056924 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001fa6d760 vpanic() at vpanic+0x1e0/frame 0xfffffe001fa6d7c0 panic() at panic+0x43/frame 0xfffffe001fa6d820 sx_destroy() at sx_destroy+0x5e/frame 0xfffffe001fa6d840 solisten_proto() at solisten_proto+0xd2/frame 0xfffffe001fa6d8a0 tcp6_usr_listen() at tcp6_usr_listen+0x1cc/frame 0xfffffe001fa6d900 solisten() at solisten+0x7a/frame 0xfffffe001fa6d940 kern_listen() at kern_listen+0x132/frame 0xfffffe001fa6d980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe001fa6dab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe001fa6dab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x412f9a, rsp = 0x7fffdfffdf38, rbp = 0x2 --- KDB: enter: panic [ thread pid 823 tid 100168 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why