Subject: [Bug 206669] New: Little-endian kernel crashing on POWER8 on heavy big-endian PowerKVM load

From: [email-masked]
Date: Tue, 25 Feb 2020 15:26:14 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=206669

            Bug ID: 206669
           Summary: Little-endian kernel crashing on POWER8 on heavy
                    big-endian PowerKVM load
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 5.4.x
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-64
          Assignee: [email-masked]
          Reporter: [email-masked]
                CC: [email-masked]
        Regression: No

Created attachment 287605
  --> https://bugzilla.kernel.org/attachment.cgi?id=287605&action=edit
Backtrace of host system crashing with little-endian kernel

We have an IBM POWER server (8247-42L) running Linux kernel 5.4.13 on Debian
unstable hosting a big-endian ppc64 virtual machine running the same kernel in
big-endian mode.

When building OpenJDK-11 on the big-endian VM, the testsuite crashes the *host*
system which is little-endian with the following kernel backtrace. The problem
reproduces both with kernel 4.19.98 as well as 5.4.13, both guest and host
running 5.4.x.

Backtrace attached.

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