The bisect reported the following as the first bad commit:
b0c3e8bd0405 ("x86/mm: Only set IBPB when the new thread cannot ptrace current
I built a Xenial test kernel with a revert of this commit. The test kernel can
be downloaded from:
Can you test this kernel and see if it resolves this bug?
Note, to test this kernel, you need to install both the linux-image and
linux-image-extra .deb packages.
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Hard lockup during boot with linux-image-4.4.0-112-generic
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