kernel's crashes

``` here's a new crash reason: Process 87588 stopped * thread #18, stop reason = EXC_BAD_ACCESS (code=1, address=0xdbdfeca4cc74afd6) frame #0: 0x00000001011c8fd4 notedeck`mdb_get + 64 notedeck`mdb_get: -> 0x1011c8fd4 <+64>: ldrb w8, [x12] 0x1011c8fd8 <+68>: tbnz w8, #0x4, 0x1011c9014 ; <+128> 0x1011c8fdc <+72>: mov w8, #0x16 ; =22 0x1011c8fe0 <+76>: mov x0, x8 (lldb) bt * thread #18, stop reason = EXC_BAD_ACCESS (code=1, address=0xdbdfeca4cc74afd6) * frame #0: 0x00000001011c8fd4 notedeck`mdb_get + 64 frame #1: 0x00000001011bab54 notedeck`ndb_ingester_thread + 516 frame #2: 0x0000000180e63c0c libsystem_pthread.dylib`_pthread_start + 136 26m KernelKind this time two threads crashed at the same time it seems: Process 39007 stopped * thread #19, stop reason = EXC_BAD_ACCESS (code=1, address=0x455030609300b3b) frame #0: 0x00000001011ce9fc notedeck`mdb_cursor_open + 56 notedeck`mdb_cursor_open: -> 0x1011ce9fc <+56>: ldrb w9, [x9, x22] 0x1011cea00 <+60>: tbnz w9, #0x3, 0x1011cea0c ; <+72> 0x1011cea04 <+64>: mov w0, #0x16 ; =22 0x1011cea08 <+68>: b 0x1011cea20 ; <+92> thread #20, stop reason = EXC_BAD_ACCESS (code=1, address=0x455030609300b3b) frame #0: 0x00000001011ce9fc notedeck`mdb_cursor_open + 56 notedeck`mdb_cursor_open: -> 0x1011ce9fc <+56>: ldrb w9, [x9, x22] 0x1011cea00 <+60>: tbnz w9, #0x3, 0x1011cea0c ; <+72> 0x1011cea04 <+64>: mov w0, #0x16 ; =22 0x1011cea08 <+68>: b 0x1011cea20 ; <+92> (lldb) bt * thread #19, stop reason = EXC_BAD_ACCESS (code=1, address=0x455030609300b3b) * frame #0: 0x00000001011ce9fc notedeck`mdb_cursor_open + 56 frame #1: 0x00000001011ac4dc notedeck`ndb_get_tsid + 96 frame #2: 0x00000001011baf54 notedeck`ndb_ingester_json_controller + 148 frame #3: 0x00000001011b4318 notedeck`ndb_ws_event_from_json + 456 frame #4: 0x00000001011bac0c notedeck`ndb_ingester_thread + 700 frame #5: 0x0000000180e63c0c libsystem_pthread.dylib`_pthread_start + 136 (lldb) thread select 20 * thread #20, stop reason = EXC_BAD_ACCESS (code=1, address=0x455030609300b3b) frame #0: 0x00000001011ce9fc notedeck`mdb_cursor_open + 56 notedeck`mdb_cursor_open: -> 0x1011ce9fc <+56>: ldrb w9, [x9, x22] 0x1011cea00 <+60>: tbnz w9, #0x3, 0x1011cea0c ; <+72> 0x1011cea04 <+64>: mov w0, #0x16 ; =22 0x1011cea08 <+68>: b 0x1011cea20 ; <+92> (lldb) bt * thread #20, stop reason = EXC_BAD_ACCESS (code=1, address=0x455030609300b3b) * frame #0: 0x00000001011ce9fc notedeck`mdb_cursor_open + 56 frame #1: 0x00000001011ac4dc notedeck`ndb_get_tsid + 96 frame #2: 0x00000001011baf54 notedeck`ndb_ingester_json_controller + 148 frame #3: 0x00000001011b4318 notedeck`ndb_ws_event_from_json + 456 frame #4: 0x00000001011bac0c notedeck`ndb_ingester_thread + 700 frame #5: 0x0000000180e63c0c libsystem_pthread.dylib`_pthread_start + 136 ```