yushuailong opened a new pull request, #20372:
URL: https://github.com/apache/nuttx/pull/20372
## Summary
`wd_start_next()` calculates the next timeout relative to the watchdog's
previous expiration time.
When `delay` is zero, the expiration time does not advance. If it is
called from an expiration callback, the watchdog is reinserted with an
expiration time that has already elapsed. `wd_expiration()` can therefore
repeatedly execute the same callback without leaving the interrupt context.
Reject non-positive delays with `-EINVAL` so that every successful
`wd_start_next()` call advances the expiration time.
Also update the API documentation to clarify that `delay` must be positive.
## Impact
bug fix only
## Testing
Build host: macOS 26.6.2 ARM64, Apple Clang 21.0.0.
Target: sim:ostest.
Build: make completes successfully with LD: nuttx.
Static checks: nxstyle, checkpatch pass.
Runtime smoke test: ./nuttx starts and proceeds through enabled OSTest cases
without an assertion in the observed run.
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