[avahi] Packet too short or invalid while reading known answer record

[Kevyn-Alexandre Paré]

I'm receiving this log, with Avahi 0.6.31, when my nexus 5 is on the network.:

avahi-core/server.c: Packet too short or invalid while reading known
answer record. (Maybe a UTF-8


This specific packet is causing it:

sudo tcpdump -i eth0 port 5353

15:03:30.494078 IP 192.168.1.239.mdns > 224.0.0.251.mdns: 0 [1a] PTR
(QM)? _googlecast._tcp.local. (59)

So from server.c it try to avahi_dns_packet_consume_record fail and log this.

610     if (!legacy_unicast) {
 611
 612         /* Known Answer Suppression */
 613         for (n = avahi_dns_packet_get_field(p,
AVAHI_DNS_FIELD_ANCOUNT); n > 0; n --) {
 614             AvahiRecord *record;
 615             int unique = 0;
 616
 617             if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
 618                 avahi_log_warn(__FILE__": Packet too short or
invalid while reading known answer record. (Maybe a UTF-8 problem?)");
 619                 goto fail;
 620             }
 621
 622
avahi_response_scheduler_suppress(i->response_scheduler, record, a);
 623             avahi_record_list_drop(s->record_list, record);
 624             avahi_cache_stop_poof(i->cache, record, a);
 625
 626             avahi_record_unref(record);
 627         }


I'm not sure if this could help:

sudo tcpdump -n host 192.168.1.211 -X
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes


18:03:30.188312 IP 192.168.1.211.5353 > 224.0.0.251.5353: 0 PTR (QU)?
_googlecast._tcp.local. (40)
0x0000:  4500 0044 0000 4000 0111 d632 c0a8 01d3  E..D.. at ....2....
0x0010:  e000 00fb 14e9 14e9 0030 682c 0000 0000  .........0h,....
0x0020:  0001 0000 0000 0000 0b5f 676f 6f67 6c65  ........._google
0x0030:  6361 7374 045f 7463 7005 6c6f 6361 6c00  cast._tcp.local.
0x0040:  000c 8001                                ....


Anybody have seen this or is able to tell me what's wrong with these packets?

BR,

-KA