I updated esp-idf and OVMS to get the new MDNS API. I started OVMS and my startup script brought up wifi, then all I did was type a '?' command to get a command list. Shortly thereafter the system crashed with a context as shown below (edited). This looks like an action the mDNS server took in response to receiving a packet that may have come from one of my Mac computers or from the DEVKIT-C. That is, it's not a crash resulting from a call to the kernel from ovms_mdns. Unwisely I did not dig further into this crash and it has not repeated so far. So I guess I'm just recording this for posterity at this point. -- Steve OVMS > Guru Meditation Error: Core 0 panic'ed (LoadProhibited) . Exception was unhandled. Core 0 register dump: PC : 0x401e690f PS : 0x00060f30 A0 : 0x801e8c6c A1 : 0x3fff2e30 A2 : 0x3ffb9260 A3 : 0x3fff2e60 A4 : 0xbaad5678 A5 : 0x00000001 A6 : 0x00060f23 A7 : 0x00000000 A8 : 0x00060023 A9 : 0x3ffe623c A10 : 0x00000000 A11 : 0x00000000 A12 : 0x8008b35b A13 : 0x3ffaf8c0 A14 : 0x00000003 A15 : 0x00060023 SAR : 0x00000019 EXCCAUSE: 0x0000001c EXCVADDR: 0xbaad5680 LBEG : 0x4000c2e0 LEND : 0x4000c2f6 LCOUNT : 0xffffffff Entering gdb stub now. Remote debugging using /dev/cu.SLAB_USBtoUART38 _mdns_append_question (packet=0x3ffb9260 <packet> "", index=0x3fff2e60, q=0xbaad5678) at /Users/casner/src/github/my-esp-idf/components/mdns/./mdns.c:988 988 if (q->host) { (gdb) bt #0 _mdns_append_question (packet=0x3ffb9260 <packet> "", index=0x3fff2e60, q=0xbaad5678) at /Users/casner/src/github/my-esp-idf/components/mdns/./mdns.c:988 #1 0x401e8c6c in _mdns_dispatch_tx_packet (p=0x3ffe6524) at /Users/casner/src/github/my-esp-idf/components/mdns/./mdns.c:1156 #2 0x401e91ac in _mdns_tx_handle_packet (p=0x3ffe6524) at /Users/casner/src/github/my-esp-idf/components/mdns/./mdns.c:3627 #3 0x401ea3f1 in _mdns_execute_action (action=0x3ffe6a90) at /Users/casner/src/github/my-esp-idf/components/mdns/./mdns.c:3889 #4 0x401ea45a in _mdns_service_task (pvParameters=<optimized out>) at /Users/casner/src/github/my-esp-idf/components/mdns/./mdns.c:3994 (gdb)