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From: Sachin Sant <sachinp@linux.vnet.ibm.com>
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Subject: [powerpc/merge] System crash during cpu offline/online operation 
Message-Id: <F4809152-C7F5-4ED8-B071-85A9115BD29D@linux.vnet.ibm.com>
Date: Fri, 11 Dec 2020 15:47:21 +0530
To: linuxppc-dev@lists.ozlabs.org
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

I am observing system crash during a cpu offline/online operation
with latest merge branch code running in a PowerVM LPAR (P8 onwards)

# uname -r
5.10.0-rc7-01792-g244569c777ca
# ppc64_cpu --smt=3D1
[  244.205194] cpu 1 (hwid 1) Ready to die=E2=80=A6
=E2=80=A6=E2=80=A6=E2=80=A6
=E2=80=A6=E2=80=A6...
[  247.015113] cpu 30 (hwid 30) Ready to die...
[  247.104973] cpu 31 (hwid 31) Ready to die=E2=80=A6
# ppc64_cpu --smt=3D8

At this point the LPAR reboots instantly without any trace message.

IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM =
IBM IBM=20
=E2=80=A6=E2=80=A6=E2=80=A6..
=E2=80=A6=E2=80=A6=E2=80=A6..
IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM IBM =
IBM IBM=20

          1 =3D SMS Menu                          5 =3D Default Boot =
List
          8 =3D Open Firmware Prompt              6 =3D Stored Boot List
          9 =3D Restricted Open Firmware Prompt

=E2=80=A6=E2=80=A6.
=E2=80=A6=E2=80=A6.

merge commit 9acd775e45 (based on rc6) was good. Mainline 5.10.0-rc7 =
also does
not exhibit this problem.=20

Thanks
-Sachin
=20=