On Thu, 14 Apr 2016 10:35:47 +0900, Joonsoo Kim said: > On Wed, Apr 13, 2016 at 08:29:46PM -0400, Valdis Kletnieks wrote: > > 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 wil l > > 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. > > Hello, > > My fault. It should be assgined every time. Please test below patch. > I will send it with proper SOB after you confirm the problem disappear. > Thanks for report and analysis! Following up - I verified that it was your patch series and not a bad bisect by starting with a clean next-20160413 and reverting that series - and the resulting kernel boots fine. Will take a closer look at your fix patch and figure out what's still changed afterwards - there's obviously some small semantic change that actually matters, but we're not spotting it yet...
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