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Cisco Bug: CSCur13110 - npumgr crash on the standby MIO

Last Modified

Dec 24, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

17.0.0.57028 17.1.0.57254 17.1.0.57431 17.1.0.57441 17.1.0.57447

Description (partial)

Symptom:
Lockup of NPU microcode leads to "npu TOPs" and/or "NPU RFD" crashes.  The "TOPS Deadlock" crash output shows PC values which (when decoded by an NPU expert) point to the inband (flow hash) update logic in MNPU microcode.

Conditions:
We believe this problem is caused either by (1) an improperly configured field in the request send from the npumgr to npu microcode, or (2) corruption of the same field during transmission to the npu microcode.  That field, the "strnum" is part of the logic that the microcode uses to update the flow hash tables.  If that number is corrupt or wrong, it is possible for the hardware to enter into an improper state, causing a lockup / race condition.
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