I'm seeing my laptop crash/wedge up/something during very early boot - before it can write anything to the console. Nothing in pstore, need to hold down the power button for 6 seconds and reboot. git bisect points at: commit 7a6bacb133752beacb76775797fd550417e9d3a2 Author: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Date: Thu Apr 7 13:59:39 2016 +1000 mm/slab: factor out kmem_cache_node initialization code It can be reused on other place, so factor out it. Following patch will use it. Not sure what the problem is - the logic *looks* ok at first read. The patch *does* remove a spin_lock_irq() - but I find it difficult to believe that with it gone, my laptop is able to hit the race condition the spinlock protects against *every single boot*. The only other thing I see is that n->free_limit used to be assigned every time, and now it's only assigned at initial creation.
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