linux-kernel - Re: [syzbot] [mm?] WARNING: suspicious RCU usage in mas

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Date:   Tue, 24 Oct 2023 17:07:32 -0700
From:   syzbot <syzbot+79fcba037b6df73756d3@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, hughd@...gle.com,
        liam.howlett@...cle.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, postmaster@...gon.onmicrosoft.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] WARNING: suspicious RCU usage in mas_walk (3)

syzbot has bisected this issue to:

commit edd33b8807a1fa6268a71758bf38de0b4adf2e70
Author: Hugh Dickins <hughd@...gle.com>
Date:   Tue Oct 3 09:29:00 2023 +0000

    mempolicy: migration attempt to match interleave nodes

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13d353cb680000
start commit:   e8361b005d7c Add linux-next specific files for 20231023
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=103353cb680000
console output: https://syzkaller.appspot.com/x/log.txt?x=17d353cb680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=39bda8753f457952
dashboard link: https://syzkaller.appspot.com/bug?extid=79fcba037b6df73756d3
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13714705680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1236430b680000

Reported-by: syzbot+79fcba037b6df73756d3@...kaller.appspotmail.com
Fixes: edd33b8807a1 ("mempolicy: migration attempt to match interleave nodes")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection