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Cisco Bug: CSCup49704 - 3850 FED Crash - Waiting for SPI channels FED_SPI_FLCD,FED_SPI_FAST ...

Last Modified

Jul 26, 2020

Products (1)

  • Cisco Catalyst 3850 Series Switches

Known Affected Releases

15.0(1)EZ 15.2(2)E

Description (partial)

Symptom:
When abruptly reloading (eg: manual power cycle) or adding/removing a switch member from a 3850 stack, other switches in the stack may begin crashing on the FED (forwarding engine driver) due to a timeout on the SPI, which is the internal message-passing system that lets services communicate with one another.

The following logs may be seen for the stack members that enter a crash loop:
FED-3-INIT_FAILED MEMBER: X fed:  Module SPI Channel failed initialization Waiting for SPI channels FED_SPI_FLCD,FED_SPI_FAST_CONV,
IOSXE-3-PLATFORM MEMBER: X process sysmgr: Service [fed] pid:[XXXX] terminated abnormally [6].

The bug is for 3850 and 3650 as its a timing issue and not related to any particular HW.

Conditions:
A stack member must be either be reloaded abruptly (eg: manual power cycle) or added/removed from the stack.
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