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Exalogic Virtual: Dom0 Compute Node Hung With "rcu_sched_state detected stall" Messages On ILOM SP Console Due to Low Baud Rate (Doc ID 2348632.1)

Last updated on NOVEMBER 14, 2022

Applies to:

Oracle Exalogic Elastic Cloud Software - Version 2.0.6.0.0 to 2.0.6.3.180417
Exalogic Elastic Cloud X5-2 Eighth Rack - Version X5 to X5 [Release X5]
Linux x86-64
Oracle Virtual Server x86-64

Symptoms

In Exalogic Virtual racks running 2.0.6.X.X releases older than July 2018 PSU, issue of Dom0 Compute Nodes hung and not responding with "rcu_sched_state detected stall" on ILOM SP console is seen.

At the time of the issue it is not possible to connect to Compute Node. Virtual Machines running on the Compute Node will also be not accessible.

Below is snippet of messages which are seen on ILOM SP console at the time of the issue.

Cause

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In this Document
Symptoms
Cause
Solution
 1. Stop Exalogic Control stack vServers using Exabr.
 2. Stop All Guest vServers running on the Compute Node.
 3. Take Backup and Update /boot/grub/grub.conf file to increase baud rate to 115200.
 4. Increase baud rate to 115200 in ILOM.
 5. Increase baud rate to 115200 in BIOS
 (a) Stop Compute Node from ILOM.
 (b) Check the Power state of the host. Power state should be off. 
 (c) Start Compute Node from ILOM.
 (d) Start SP console using below command as soon as you come back to ILOM prompt after running above command.
 (e) Once you see the initial BIOS banner, hit "Control-E" several times when prompted; this will trigger the BIOS Setup menu after the initialization. OR enter the BIOS Setup Utility by pressing the F2 key during boot.
 6. Once the Compute Node comes back up, Validate whether baud rate settings are updated to 115200 at OS, ILOM and BIOS level using below commands.
 7. Start the stopped Guest vServers.
 8. Repeat above steps 2-7 on rest of the Compute Nodes.
 9. Finally start the Exalogic control stack vServers using Exabr
References


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