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Cisco Bug: CSCvu86996 - N9K reloading continuously because of kernel panic after upgrade.

Last Modified

Aug 24, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

9.3(3)

Description (partial)

Symptom:
N9k started rebooting continuously after upgrade from 7.0(3)I7(4) to 9.3(3)

`show system reset-reason`
----- reset reason for module 1 (from Supervisor in slot 1) ---
<snip>
3) At 488602 usecs after Sat Jun 13 03:54:21 2020
    Reason: Kernel Panic
    Service:
    Version: 9.3(3)
4) At 485109 usecs after Sat Jun 13 03:47:42 2020
    Reason: Kernel Panic
    Service:
    Version:

`show logging onboard module 1 stack-trace`
----------------------------
    Module:  1
----------------------------

**************************************************************
    STACK TRACE GENERATED AT Sat Jun 13 04:11:27 2020 EDT

**************************************************************
Panic#1 Part2
<3>[  212.138832]
<3>[  212.138832] cctrl_handle_io_isr Got LC Presence intr 9
<6>[  212.138873] LEM OIR detected..
<6>[  212.138873] Slot(1) got interrupt
<6>[  212.138874] Slot(2) got interrupt
<6>[  212.138874] Slot(3) got interrupt
<6>[  212.138875] Slot(4) got interrupt
<6>[  212.138875] Slot(6) got interrupt
<6>[  212.138875] Slot(7) got interrupt
<6>[  212.138876] Slot(8) got interrupt
<3>[  212.138887]
<snip>

Conditions:
N9k starts rebooting continuously after upgrade with the following logs

 Slot(1) got interrupt
 Slot(2) got interrupt
 Slot(3) got interrupt
 Slot(4) got interrupt
 Slot(6) got interrupt
 Slot(7) got interrupt
 Slot(8) got interrupt
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