linux-kernel - Re: mm: LTP/memcg testcase regression induced by 8cd7c588decf..66ce520bb7c2 series

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Message-ID: <20211123091304.GC3366@techsingularity.net>
Date:   Tue, 23 Nov 2021 09:13:04 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Mike Galbraith <efault@....de>
Cc:     lkml <linux-kernel@...r.kernel.org>
Subject: Re: mm: LTP/memcg testcase regression induced by
 8cd7c588decf..66ce520bb7c2 series

On Sun, Nov 21, 2021 at 11:57:20AM +0100, Mike Galbraith wrote:
> Greetings,
> 
> FYI, something in this series causes LTP controllers::memcg_regression
> testcase to hang forever.  Verified via brute force revert of the lot.
> 
> After letting box moan for 4.5 hours, I poked ^C repeatedly, but runltp
> didn't exit/recover gracefully, and ps hung, so I nuked the box.  All
> memcg_test_1 instances were stuck in reclaim_throttle().
> 

I'll see can I reproduce this but do you know offhand what the test is
doing and what the expected outcome is? A possibility is that this is a
test that is driving the machine near OOM (or at least memcg OOM) and
getting throttled instead of getting killed.

-- 
Mel Gorman
SUSE Labs