Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer	= 0x20:0xffffffff8102b53b
stack pointer	        = 0x0:0xfffffe0016bba900
frame pointer	        = 0x0:0xfffffe0016bba990
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 15 (sctp_iterator)
trap number		= 9
panic: general protection fault
cpuid = 0
time = 1567390774
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0016bba5d0
vpanic() at vpanic+0x1e0/frame 0xfffffe0016bba630
panic() at panic+0x43/frame 0xfffffe0016bba690
trap_fatal() at trap_fatal+0x4de/frame 0xfffffe0016bba710
trap() at trap+0xb8/frame 0xfffffe0016bba830
calltrap() at calltrap+0x8/frame 0xfffffe0016bba830
--- trap 0x9, rip = 0xffffffff8102b53b, rsp = 0xfffffe0016bba900, rbp = 0xfffffe0016bba990 ---
__mtx_lock_sleep() at __mtx_lock_sleep+0x17b/frame 0xfffffe0016bba990
__mtx_lock_flags() at __mtx_lock_flags+0x157/frame 0xfffffe0016bba9f0
sctp_iterator_worker() at sctp_iterator_worker+0x422/frame 0xfffffe0016bbaa40
sctp_iterator_thread() at sctp_iterator_thread+0x5e/frame 0xfffffe0016bbaa60
fork_exit() at fork_exit+0xb0/frame 0xfffffe0016bbaab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0016bbaab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 15 tid 100054 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why