panic: m_getm2: len is < 0 cpuid = 0 time = 1552818697 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001fa93300 vpanic() at vpanic+0x1e0/frame 0xfffffe001fa93360 panic() at panic+0x43/frame 0xfffffe001fa933c0 m_getm2() at m_getm2+0x478/frame 0xfffffe001fa93430 m_uiotombuf() at m_uiotombuf+0xb5/frame 0xfffffe001fa93490 sctp_lower_sosend() at sctp_lower_sosend+0x5099/frame 0xfffffe001fa93670 sctp_sosend() at sctp_sosend+0x510/frame 0xfffffe001fa937a0 sosend() at sosend+0xc6/frame 0xfffffe001fa93810 kern_sendit() at kern_sendit+0x35e/frame 0xfffffe001fa938c0 sendit() at sendit+0x226/frame 0xfffffe001fa93920 sys_sendmsg() at sys_sendmsg+0x8b/frame 0xfffffe001fa93980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe001fa93ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe001fa93ab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x412e5a, rsp = 0x7fffdffdcf38, rbp = 0x3 --- KDB: enter: panic [ thread pid 904 tid 100305 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why