Warning: Permanently added '10.128.0.90' (ECDSA) to the list of known hosts. executing program panic: Duplicate free of 0xfffff800049ad800 from zone 0xfffff800041e82c0(mbuf) slab 0xfffff800049adf90(8) cpuid = 0 time = 1552920091 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0016b2c4a0 vpanic() at vpanic+0x1e0/frame 0xfffffe0016b2c500 panic() at panic+0x43/frame 0xfffffe0016b2c560 uma_dbg_free() at uma_dbg_free+0x246/frame 0xfffffe0016b2c5b0 uma_zfree_arg() at uma_zfree_arg+0x1aa/frame 0xfffffe0016b2c640 uipc_ready() at uipc_ready+0x19f/frame 0xfffffe0016b2c690 sendfile_iodone() at sendfile_iodone+0x342/frame 0xfffffe0016b2c6f0 vnode_pager_generic_getpages_done_async() at vnode_pager_generic_getpages_done_async+0x4a/frame 0xfffffe0016b2c720 bufdone() at bufdone+0xa1/frame 0xfffffe0016b2c7a0 g_io_deliver() at g_io_deliver+0x35b/frame 0xfffffe0016b2c800 g_io_deliver() at g_io_deliver+0x35b/frame 0xfffffe0016b2c860 g_io_deliver() at g_io_deliver+0x35b/frame 0xfffffe0016b2c8c0 g_disk_done() at g_disk_done+0x179/frame 0xfffffe0016b2c910 dadone() at dadone+0x655/frame 0xfffffe0016b2c9a0 xpt_done_process() at xpt_done_process+0x5b2/frame 0xfffffe0016b2ca00 xpt_done_td() at xpt_done_td+0x175/frame 0xfffffe0016b2ca60 fork_exit() at fork_exit+0xb0/frame 0xfffffe0016b2cab0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0016b2cab0 --- trap 0, rip = 0, rsp = 0, rbp = 0 --- KDB: enter: panic [ thread pid 5 tid 100031 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why