linux-kernel - Re: Zram writeback feature unstable with heavy swap utilization

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Message-ID: <20180725040758.GA616@jagdpanzerIV>
Date:   Wed, 25 Jul 2018 13:07:58 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Minchan Kim <minchan@...nel.org>,
        Tino Lehnig <tino.lehnig@...tabo.de>, ngupta@...are.org,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Zram writeback feature unstable with heavy swap utilization -
 BUG: Bad page state in process...

On (07/24/18 19:51), Matthew Wilcox wrote:
> 
> Also note that this is in the allocation path; this flag isn't checked
> at free.  But it is cleared on free, so someone's stomping on page->flags
> after they're freed.  I suggest enabling more debugging code.

Would be lovely if Tino could bisect it, perhaps.

	-ss