panic: Memory modified after free 0xfffff800049c2200(256) val=0 @ 0xfffff800049c2200

cpuid = 0
time = 1557874431
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0021299ff0
vpanic() at vpanic+0x1e0/frame 0xfffffe002129a050
panic() at panic+0x43/frame 0xfffffe002129a0b0
trash_ctor() at trash_ctor+0xaa/frame 0xfffffe002129a0f0
mb_ctor_mbuf() at mb_ctor_mbuf+0x30/frame 0xfffffe002129a130
uma_zalloc_arg() at uma_zalloc_arg+0x1036/frame 0xfffffe002129a1e0
m_getm2() at m_getm2+0x213/frame 0xfffffe002129a250
sctp_get_mbuf_for_msg() at sctp_get_mbuf_for_msg+0x4a/frame 0xfffffe002129a290
sctp_lowlevel_chunk_output() at sctp_lowlevel_chunk_output+0x164/frame 0xfffffe002129a3e0
sctp_send_abort_tcb() at sctp_send_abort_tcb+0x360/frame 0xfffffe002129a4c0
sctp_abort_an_association() at sctp_abort_an_association+0x38/frame 0xfffffe002129a500
sctp_lower_sosend() at sctp_lower_sosend+0x2b12/frame 0xfffffe002129a6d0
sctp_sosend() at sctp_sosend+0x510/frame 0xfffffe002129a800
sosend() at sosend+0xc6/frame 0xfffffe002129a870
soo_write() at soo_write+0x61/frame 0xfffffe002129a8b0
dofilewrite() at dofilewrite+0xfd/frame 0xfffffe002129a910
kern_writev() at kern_writev+0x66/frame 0xfffffe002129a950
sys_writev() at sys_writev+0x50/frame 0xfffffe002129a980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe002129aab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe002129aab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x41309a, rsp = 0x7fffdffdcf38, rbp = 0x3 ---
KDB: enter: panic
[ thread pid 808 tid 100124 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why