linux-kernel - Re: Crashes/hung tasks with z3pool under memory pressure

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Message-ID: <20180413173555.GA30587@roeck-us.net>
Date:   Fri, 13 Apr 2018 10:35:55 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Vitaly Wool <vitalywool@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        mawilcox@...rosoft.com, asavery@...omium.org, gwendal@...omium.org
Subject: Re: Crashes/hung tasks with z3pool under memory pressure

On Fri, Apr 13, 2018 at 05:21:02AM +0000, Vitaly Wool wrote:
> Hi Guenter,
> 
> 
> Den fre 13 apr. 2018 kl 00:01 skrev Guenter Roeck <linux@...ck-us.net>:
> 
> > Hi all,
> 
> > we are observing crashes with z3pool under memory pressure. The kernel
> version
> > used to reproduce the problem is v4.16-11827-g5d1365940a68, but the
> problem was
> > also seen with v4.14 based kernels.
> 
> 
> just before I dig into this, could you please try reproducing the errors
> you see with https://patchwork.kernel.org/patch/10210459/ applied?
> 

As mentioned above, I tested with v4.16-11827-g5d1365940a68, which already
includes this patch.

$ git log --oneline v4.14..5d1365940a68 mm/z3fold.c
8a97ea546bb6 mm/z3fold.c: use gfpflags_allow_blocking
1ec6995d1290 z3fold: fix memory leak
5c9bab592f53 z3fold: limit use of stale list for allocation
f144c390f905 mm: docs: fix parameter names mismatch
5d03a6613957 mm/z3fold.c: use kref to prevent page free/compact race

Guenter