Kernel page fault with the following nonpanic: Memory modified after free 0xfffff80004995d00(256) val=0 @ 0xfffff80004995d00 cpuid = 0 time = 1558105051 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00212a41b0 vpanic() at vpanic+0x1e0/frame 0xfffffe00212a4210 panic() at panic+0x43/frame 0xfffffe00212a4270 trash_ctor() at trash_ctor+0xaa/frame 0xfffffe00212a42b0 mb_ctor_mbuf() at mb_ctor_mbuf+0x30/frame 0xfffffe00212a42f0 uma_zalloc_arg() at uma_zalloc_arg+0x1036/frame 0xfffffe00212a43a0 m_getm2() at m_getm2+0x1c0/frame 0xfffffe00212a4410 sctp_get_mbuf_for_msg() at sctp_get_mbuf_for_msg+0x4a/frame 0xfffffe00212a4450 sctp_send_shutdown() at sctp_send_shutdown+0x8d/frame 0xfffffe00212a44a0 sctp_lower_sosend() at sctp_lower_sosend+0x5044/frame 0xfffffe00212a4670 sctp_sosend() at sctp_sosend+0x510/frame 0xfffffe00212a47a0 sosend() at sosend+0xc6/frame 0xfffffe00212a4810 kern_sendit() at kern_sendit+0x35e/frame 0xfffffe00212a48c0 sendit() at sendit+0x226/frame 0xfffffe00212a4920 sys_sendmsg() at sys_sendmsg+0x8b/frame 0xfffffe00212a4980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe00212a4ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00212a4ab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x41309a, rsp = 0x7fffdffdcf38, rbp = 0x3 --- KDB: enter: panic [ thread pid 806 tid 100127 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why db>