** Description changed:
- It seems all of the artful 4.13 are crashing on i386 install when memory
- hotplug removal is attempted. This crash occurs a few seconds after the
- removal. I have done a gross bisect back to the first 4.13.0-11 which
- is also affected.
+ == SRU Request, Artful ==
+ Hotplug removal causes i386 crashes when exercised with the kernel
+ selftest mem-on-off-test script.
+ == Fix ==
+ Revert commit f1dd2cd13c4b (""mm, memory_hotplug: do not associate
+ hotadded memory to zones until online")
+ Note: A fix occurs in 4.15 however this requires a large set of changes
+ that are way too large to be SRU'able and the least risky way forward is
+ to revert the offending commit.
+ == Testcase ==
+ Running the kernel selftest script mem-on-off-test.sh, followed by a
+ sync, followed by re-installing kernel packages will always trigger this
+ issue. Simply running the mem-on-off-test.sh script sometimes won't
+ trigger the problem. I believe this is why we've not seen this happen
+ too frequently with our ADT tests. I can reproduce this in a VM with 4
+ CPUs and 2GB of memory.
+ == Regression Potential ==
+ Reverting this commit does remove some functionality, however this does
+ not regress the kernel compared to previous releases and having a
+ working reliable memory hotplug is the preferred option. This fix does
+ touch some memory hotplug, so there is a risk that this may break this
+ functionality that is not covered by the kernel regression testing.
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artful 4.13 i386 kernels crash after memory hotplug remove
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