Re: [PATCH stable-4.9 2/2] mm, vmscan: consider eligible zones in get_scan_count

[Michal Hocko]

On Mon 06-03-17 19:00:00, MegaBrutal wrote:
> Hi Michal,
> 
> I'm over a very long kernel bisection, and if I made no mistake in
> testing commits, this patch fixes a kernel bug which affects my HP
> Compaq dc5800 machine with 32 bit Ubuntu OS.
> 
> The bug manifests itself with "NMI watchdog: BUG: soft lockup - CPU#0
> stuck for 23s! [kswapd0:38]" messages in 4.8 kernels, and "page
> allocation stalls for 47608ms, order:1,
> mode:0x17000c0(GFP_KERNEL_ACCOUNT|__GFP_NOTRACK)" in 4.10 kernels up
> to this commit.

This is really hard to say without seeing the traces.
 
> Michal, can you confirm that this patch may fix issues like the ones I
> encountered? If so, I'll try to get the Ubuntu kernel staff to
> backport this commit to Yakkety's 4.8 kernel. On the other hand, I
> can't seem to be able to backport this commit to 4.8 with "git
> cherry-pick", so maybe I need to wait for your tweaks you mentioned.

The backport from 4.9 to 4.8 shouldn't be very complicated I believe.
 
> Anyway, thank you very much for the fix!

Good to hear the patch helped you though.
-- 
Michal Hocko
SUSE Labs