linux-kernel - Re: [syzbot] memory leak in xas

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Message-ID: <YqD6Z7d5g8e19WO+@casper.infradead.org>
Date:   Wed, 8 Jun 2022 20:37:11 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     syzbot <syzbot+9e27a75a8c24f3fe75c1@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] memory leak in xas_nomem

On Fri, May 27, 2022 at 08:20:21PM -0700, syzbot wrote:
> BUG: memory leak
> unreferenced object 0xffff88810cb35d80 (size 576):
>   comm "syz-executor883", pid 3623, jiffies 4294954631 (age 23.510s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     18 48 36 04 81 88 ff ff 98 5d b3 0c 81 88 ff ff  .H6......]......
>   backtrace:
>     [<ffffffff8247dfba>] xas_nomem lib/xarray.c:307 [inline]
>     [<ffffffff8247dfba>] xas_nomem+0x4a/0xd0 lib/xarray.c:299
>     [<ffffffff8157b8d0>] split_huge_page_to_list+0x26d0/0x29f0 mm/huge_memory.c:2626

#syz test: git://git.infradead.org/users/willy/pagecache.git for-next