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netutils/mdns: raise responder stack size default to 8KiB

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CONFIG_NETUTILS_MDNS_STACKSIZE defaulted to DEFAULT_TASK_STACKSIZE,
which resolves to as little as 2KiB on some targets.  The bundled
mjansson responder uses a deeper stack than that (DNS record parsing
with name decompression, plus the send/receive buffers) and overflows
on startup, taking the board down with a hardfault before it answers a
single query.

Default to 8KiB, the value that reliably runs the responder, and
correct the help text, which previously claimed a 4KiB default that did
not match DEFAULT_TASK_STACKSIZE.

Assisted-by: Claude (Anthropic Claude Code)
Signed-off-by: Ricard Rosson <ricard@groundbits.com>
This commit is contained in:
Ricard Rosson 2026-07-11 06:17:53 +01:00 • committed by Xiang Xiao
parent fc14d02ae0
commit be43888aa5
1 changed files with 4 additions and 4 deletions
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8
netutils/mdns/Kconfig
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@ -51,11 +51,11 @@ config NETUTILS_MDNS_PRIORITY
config NETUTILS_MDNS_STACKSIZE
int "mDNS stack size"
default DEFAULT_TASK_STACKSIZE
default 8192
---help---
The default (4KiB) is adequate for simple networks but this will
most likely need to be increased if there are many network devices
attached that could send queries.
Stack size for the mDNS responder task. 8KiB is adequate for
typical networks; increase it if many network devices send
queries.
config NETUTILS_MDNS_VERBOSE
bool "Enable verbose printf output from built-in mdns demo"