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Cisco Bug: CSCsy89421 - EN-GW crashes while draining pend Q when IB interface is backpressured

Last Modified

Jan 20, 2017

Products (1)

Known Affected Releases


Description (partial)


TopspinOS 2.8.0 build 173 or lower

When the SFS 3012 Ethernet gateway has a burst of slowpath traffic (particularly ARP requests) that need to be sent out on a congested Infiniband Interface, the ethernet gateway reboots.
The reboot occurs when all the following conditions are true:
a. The Infiniband interface is congested
b. There is a packet destined for an Infiniband host that is to be dequeued from an internal pending queue and transmitted
c. The address entry for the host has been cleared out
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