ESP8266mDNS crash when doing MDNS.queryService("arduino", "tcp")

[martinayotte]

Basic Infos

Hardware

Hardware: Wemos-D1 Mini (ESP-12)
Core Version: Stable 2.3.0

Description

ESP8266mDNS crash when doing MDNS.queryService("arduino", "tcp")
but doesn't with other service like MDNS.queryService("telnet", "tcp")

Settings in IDE

Module: ?Generic ESP8266 Module?
Flash Size: ?4MB/1MB?
CPU Frequency: ?80Mhz?
Flash Mode: ?qio?
Flash Frequency: ?40Mhz?
Upload Using: ?OTA / SERIAL?
Reset Method: ?ck / nodemcu?

Stacktrace

x4020e551: MDNSResponder::_parsePacket() at /home/martin/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/libraries/ESP8266mDNS/ESP8266mDNS.cpp:656
0x4020e489: MDNSResponder::_parsePacket() at /home/martin/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/libraries/ESP8266mDNS/ESP8266mDNS.cpp:611
0x40101daa: pp_post at ??:?
0x40101daa: pp_post at ??:?
0x40105087: lmacRxDone at ??:?
0x40101daa: pp_post at ??:?
0x40102abd: trc_NeedRTS at ??:?
0x40102c4c: trc_NeedRTS at ??:?
0x40102c4c: trc_NeedRTS at ??:?
0x40102c4c: trc_NeedRTS at ??:?
0x4010308a: wDev_ProcessFiq at ??:?
0x4000050c: ?? ??:0
0x40102e24: wDev_ProcessFiq at ??:?
0x402215a5: ieee80211_ht_updateparams at ??:?
0x40244668: etharp_send_ip at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/netif/etharp.c:435
0x40101daa: pp_post at ??:?
0x40105087: lmacRxDone at ??:?
0x4024494d: etharp_output_to_arp_index at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/netif/etharp.c:890
0x40102c4c: trc_NeedRTS at ??:?
0x40101daa: pp_post at ??:?
0x40101a55: ppEnqueueRxq at ??:?
0x4010193e: ppEnqueueRxq at ??:?
0x4010170b: ppProcessTxQ at ??:?
0x40101daa: pp_post at ??:?
0x40105087: lmacRxDone at ??:?
0x40102abd: trc_NeedRTS at ??:?
0x4010020c: _umm_free at /home/martin/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/umm_malloc/umm_malloc.c:1287
0x40102b6f: trc_NeedRTS at ??:?
0x4000050c: ?? ??:0
0x40102e24: wDev_ProcessFiq at ??:?
0x4020e88d: MDNSResponder::update() at /home/martin/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/libraries/ESP8266mDNS/ESP8266mDNS.cpp:219
0x4021689b: std::_Function_handler<void (), std::_Bind<std::Mem_fn<void (MDNSResponder::*)()> (MDNSResponder)> >::M_invoke(std::Any_data const&) at /home/martin/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/xtensa-lx106-elf/include/c++/4.8.2/functional:2073
0x40000f58: ?? ??:0
0x4020c6e4: UdpContext::s_recv(void, udp_pcb, pbuf, ip_addr*, unsigned short) at /home/martin/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/libraries/ESP8266mDNS/ESP8266mDNS.cpp:225
0x40244140: udp_input at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/udp.c:343
0x401070a4: pvPortMalloc at /home/martin/.arduino15/packages/esp8266/hardware/esp8266/2.3.0/cores/esp8266/heap.c:13
0x4024588c: ip_input at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/ipv4/ip.c:553
0x40244c85: ethernet_input at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/netif/etharp.c:1379
0x4021b483: pp_tx_idle_timeout at ??:?
0x4021b3f6: pp_tx_idle_timeout at ??:?
0x4022f487: ets_snprintf at ??:?
0x40000f49: ?? ??:0
0x40000f49: ?? ??:0

[me-no-dev]

what is the exception number/cause?

[martinayotte]

Soft WDT ets Jan 8 2013,rst cause:2, boot mode:(3,6)

I've got the crash with MDNS.queryService("http", "tcp") too.

[me-no-dev]

that is not the cause :) the cause was at the top of the stack trace (above the actual trace)
exceptions are outlined here: https://github.com/esp8266/Arduino/blob/master/doc/exception_causes.md

[martinayotte]

Is that what you means (just above the stacktrace) ?

Soft WDT reset

ctx: sys
sp: 3ffffa60 end: 3fffffb0 offset: 01b0

[martinayotte]

BTW, with HTTP, it is intermittent, sometimes it doesn't crash.

[liquidfalcon]

Same issue as #2169 and #2020 - It's hitting an infinite loop when it's iterating the linked list of answers, and never breaks, causing the WDT to bark

[martinayotte]

Glad to see that I'm not the only one facing this bug ...

[me-no-dev]

Can you guys test this PR?
Let me know if you still get resets

mDNS query _arduino._tcp
2 service(s) found
1: (192.168.254.182:8266) esp-test
2: (192.168.254.156:22) piduino1
mDNS query _http._tcp
2 service(s) found
1: (192.168.254.182:80) esp-test
2: (192.168.254.194:80) HP LaserJet CP1025nw
mDNS query _ipp._tcp
1 service(s) found
1: (192.168.254.194:631) HP LaserJet CP1025nw
mDNS query _afpovertcp._tcp
1 service(s) found
1: (192.168.254.49:548) Hristo's Time Capsule
mDNS query _smb._tcp
1 service(s) found
1: (192.168.254.49:445) Hristo's Time Capsule
mDNS query _ftp._tcp
0 service(s) found

[martinayotte]

Hi me-no-dev,
I still getting the same Soft WDT crash when using MDNS.queryService("arduino", "tcp") or MDNS.queryService("http", "tcp").
(I've only took your new ESP8266mDNS.cpp on top of stable 2.3.0. Is there other things needed ?)

[me-no-dev]

can you please enable RX debug in the cpp file in the lib and post some output?
I tried to cover all possible lockups that I came by...

[martinayotte]

Here is some output with the MDNS_DEBUG_RX :
(there is a delay of 1 or 2 secs between the last line and the Soft WDT)

`Reading answers RX: REQ, ID:0, Q:0, A:5, NS:0, ADD:0
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 000c rdlength: 9
PTR 9 �domino�

type: 0010 rdlength: 38
TXT 38 �board=domino board�distro_version=0.1
type: 0021 rdlength: 15
SRV 6 64 6f 6d 69 6e 6f
domino
type: 001c rdlength: 16
Ignoring unsupported type 78
type: 0001 rdlength: 4
All answers parsed, adding to _answers list..
RX: REQ, ID:0, Q:1, A:0, NS:0, ADD:0
REQ: _arduino._tcp.local. PTR IN
Reading answers RX: REQ, ID:0, Q:0, A:4, NS:0, ADD:0
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 000c rdlength: 41
PTR 41 �ESPIRBlaster-A6523_arduino�_tcplocal
19 ESPIRBlaster-A65234
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 0010 rdlength: 62
TXT 62
ssh_upload=no�board=ESP8266_ESP01auth_upload=no
19 ESPIRBlaster-A65234
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 0021 rdlength: 33
SRV 19 65 73 70 69 72 62 6c 61 73 74 65 72 2d 61 36 35 32 33 34
espirblaster-a65234
19 espirblaster-a65234
5 local
type: 0001 rdlength: 4
All answers parsed, adding to _answers list..
Reading answers RX: REQ, ID:0, Q:0, A:4, NS:0, ADD:0
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 000c rdlength: 38
PTR 38 �iCondoESP-A08D0_arduino�_tcplocal
16 iCondoESP-A08D0B
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 0010 rdlength: 56
TXT 56
board=genericauth_upload=no tcp_check=no
16 iCondoESP-A08D0B
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 0021 rdlength: 30
SRV 16 69 63 6f 6e 64 6f 65 73 70 2d 61 30 38 64 30 62
icondoesp-a08d0b
16 icondoesp-a08d0b
5 local
type: 0001 rdlength: 4
All answers parsed, adding to _answers list..
Reading answers RX: REQ, ID:0, Q:0, A:4, NS:0, ADD:0
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 000c rdlength: 38
PTR 38 �iCondoESP-9C2A7_arduino�_tcplocal
16 iCondoESP-9C2A71
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 0010 rdlength: 56
TXT 56
board=genericauth_upload=no tcp_check=no
16 iCondoESP-9C2A71
8 _arduino
found matching service: arduino
4 _tcp
5 local
type: 0021 rdlength: 30
SRV 16 69 63 6f 6e 64 6f 65 73 70 2d 39 63 32 61 37 31
icondoesp-9c2a71
16 icondoesp-9c2a71
5 local
type: 0001 rdlength: 4
All answers parsed, adding to _answers list..

Soft WDT reset

ctx: sys
sp: 3ffffa50 end: 3fffffb0 offset: 01b0
`