linux-kernel - Re: 4.6.2 frequent crashes under memory + IO pressure

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Message-ID: <20160625172951.GA5586@sig21.net>
Date:	Sat, 25 Jun 2016 19:29:51 +0200
From:	Johannes Stezenbach <js@...21.net>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org, mhocko@...nel.org
Subject: Re: 4.6.2 frequent crashes under memory + IO pressure

On Sun, Jun 26, 2016 at 02:04:40AM +0900, Tetsuo Handa wrote:
> It seems to me that somebody is using ALLOC_NO_WATERMARKS (with possibly
> __GFP_NOWARN), but I don't know how to identify such callers. Maybe print
> backtrace from __alloc_pages_slowpath() when ALLOC_NO_WATERMARKS is used?

Wouldn't this create too much output for slow serial console?
Or is this case supposed to be triggered rarely?

This crash testing is pretty painful but I can try it tomorrow
if there is no better idea.

Johannes