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Timer rollback in beacons on AR9342-based AP

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Hello,

On an AR9342-based AP, we occasionally see the TSF timer in beacons
roll back i.e. the timer resets and starts over. This causes all
clients to disconnect probably because their power-save timers get out
of sync. This typically happens under heavy load.

The AP is running openwrt with compat-wireless from Feb 22nd 2013 and
the 1.0 release of hostapd (pkg version = 20120910).

Any ideas on what could be causing the timer to reset? What kind of
additional information would help in debugging this?

Thanks,
- Harshal
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