Subject: [Bug 207359] New: MegaRAID SAS 9361 controller hang/reset

From: [email-masked]
Date: Sun, 19 Apr 2020 18:25:56 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=207359

            Bug ID: 207359
           Summary: MegaRAID SAS 9361 controller hang/reset
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: >=v5.4
          Hardware: PPC-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-64
          Assignee: [email-masked]
          Reporter: [email-masked]
        Regression: No

Created attachment 288623
  --> https://bugzilla.kernel.org/attachment.cgi?id=288623&action=edit
dmesg output for controller hang

On a Talos II 2x 36 core (144 thread) POWER9 box, MegaRAID SAS 9361-16i PCIE
controller can be made to pretty consistently hang with "heavy IO" on kernel
versions greater than 5.3.18.
I am unable to reproduce this on a 16/32 core/thread amd64 box with a MegaRAID
SAS 9361-16i PCIE with the exact same firmware revision.

The box also has a Microsemi SAS HBA which seems unaffected by this.

System details:
Talos II motherboard
2x 36 core (144 thread) POWER9 processors
512GB memory
4k page size
MegaRAID SAS 9361-16i PCIE controller (4 disk RAID10 volume, megaraid_sas
driver)
Microsemi HBA w/4x SSD's

The relevant dmesg messages are attached.

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