I suspect all kernel TLB entries need to be flushed prior to alternative patching to ensure that kernel
pages are writeable.
Was this a reboot or cold boot?
Reboot from 4.19.0.
Next reboots from 4.19.0+git worked fine.
Cold boot into 4.19-git workd fine too now.
Will try if I can make it happen again when rebooting from 4.19.0
(maybe it has cached different pages in TLB to make a difference -
but that may depend on the previous load).
No, I could not reproduce it just by booting into 4.19 and then into
the new kernel.
--
Meelis Roos <mroos@xxxxxxxx>
