linux-kernel - Re: System freezes after OOM

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Message-ID: <9ca3459a-8226-b870-163e-58e2bb10df74@redhat.com>
Date:	Thu, 14 Jul 2016 19:07:52 +0200
From:	Ondrej Kozina <okozina@...hat.com>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	Mikulas Patocka <mpatocka@...hat.com>,
	Jerome Marchand <jmarchan@...hat.com>,
	Stanislav Kozina <skozina@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com
Subject: Re: System freezes after OOM

On 07/14/2016 05:31 PM, Michal Hocko wrote:
> On Thu 14-07-16 16:08:28, Ondrej Kozina wrote:
> [...]
>> As Mikulas pointed out, this doesn't work. The system froze as well with the
>> patch above. Will try to tweak the patch with Mikulas's suggestion...
>
> Thank you for testing! Do you happen to have traces of the frozen
> processes? Does the flusher still gets throttled because the bias it
> gets is not sufficient. Or does it get throttled at a different place?
>

Sure. Here it is (including sysrq+t and sysrq+w output): 
https://okozina.fedorapeople.org/bugs/swap_on_dmcrypt/4.7.0-rc7+/1/4.7.0-rc7+.log

In a directory with the log there's also a patch the kernel was compiled 
with.

Ondra