Oracle Linux: Server with QLogic HBA Hangs with Many "kworker" Processes in "D-state" and High CPU Load Average (Doc ID 2635874.1)

Last updated on OCTOBER 18, 2022

Applies to:

Symptoms

Server running kernel 4.1.12-124.32.3.2.el6uek.X86_64 with Qlogic card using driver "qla2xxx" may experiences the following behavior when system is under heavy load of traffic over the Qlogic HBA:

• High CPU load average.
• Many kworker processes in D-state which commonly means they are waiting on the storage device to return the requested I/O.
• 100% or more of disk read utilization.
• Some processes stuck and showing message "process:#### blocked for more than 120 seconds" under /var/log/messages.
• Server becomes unresponsive and needs to be either rebooted or manually crashed.

Changes

When enable debugging on qla2xxx driver the system get more details on /var/log/messages:

Cause

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