https://bugzilla.kernel.org/show_bug.cgi?id=203837
Bug ID: 203837
Summary: Booting kernel under KVM immediately freezes host
Product: Platform Specific/Hardware
Version: 2.5
Kernel Version: v5.2-rc2
Hardware: PPC-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: blocking
Priority: P1
Component: PPC-64
Assignee: platform_ppc...@kernel-bugs.osdl.org
Reporter: sh...@anastas.io
Regression: No
Created attachment 283133
--> https://bugzilla.kernel.org/attachment.cgi?id=283133&action=edit
Guest kernel config
When booting kernel v5.2-rc2 (and confirmed up to 156c05917) in a VM on a
POWER9 host running kernel 5.1.7, the host immediately locks up and
becomes unresponsive to the point of requiring a hard reset.
The last guest kernel message printed to the screen before the
host locks up is:
[ 0.013940] smp: Bringing up secondary CPUs ...
Due to the nature of the bug, it is very difficult to bisect, since a manual
host reset is required each time the bug is encountered. Also, my only
POWER machine is my primary workstation.
The bug has also been confirmed on other host kernel versions (down to 5.0.x).
When downgrading the guest kernel to 5.1.0, the issue is not present.
The guest kernel .config is attached.
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