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dmesg also show the following messages:

megaraid_sas 0000:01:00.0: Failed to alloc kernel SGL buffer for IOCTL

The issue may occur when the operating system is under pressure for high-order memory.

Applies to: Red Hat Enterprise Linux 7.9

Workaround: Reconfigure the virtual disk from the Integrated Dell Remote Access Controller (iDRAC).

Cause: By default, the cache setting for VMs is set to write back. This results in host memory being used for

buffer cache when storage I/O is being performed by guest VMs.

Resolution: Modify the cache setting for guest VMs to none. For more information, see Red Hat Enterprise Linux

Knowledge Base article 5905701.

Modify the below:

Systems

affected:

All supported Dell EMC PowerEdge systems

Tracking number: 183631

Operating system crashes when twenty DIMMs are

connected to the server and the number of I/O

operations is high

Description:

The operating system crashes when twenty DIMMs are connected to the server that is performing a high

number of I/O operations that engage both memory and hard drive. For more information, see Red Hat

Enterprise Linux Knowledge Base article 5486951.

Applies to: Red Hat Enterprise Linux 7.8 and later

Cause: This issue is caused by the function move_freepages. The function does not check the validity of the end

page frame number.

Workaround:

Not available. This issue is observed when 20 memory modules are connected to the server. This issue

does not occur when 16 or 32 memory modules are connected to the server.

Solution: The issue is fixed in RHEL 7.9 z-stream kernel version kernel-3.10.0-1160.11.1.el7. For more information,

see https://access.redhat.com/solutions/5486951.

Systems

affected:

Dell EMC PowerEdge R6515, Dell EMC PowerEdge R7515, Dell EMC PowerEdge R6525, Dell EMC

PowerEdge R7525, and Dell EMC PowerEdge C6525.

Tracking number: 176487

12 Fixes