linux-kernel - Re: [syzbot] [mm?] UBSAN: shift-out-of-bounds in try_to_shrink

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Date: Tue, 28 May 2024 18:54:02 -0700
From: syzbot <syzbot+17416257cb95200cba44@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, hannes@...xchg.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, riel@...riel.com, 
	roman.gushchin@...ux.dev, shakeel.butt@...ux.dev, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] UBSAN: shift-out-of-bounds in try_to_shrink_lruvec

syzbot has bisected this issue to:

commit 6be5e186fd655df4b3ba267054de2eaaadc71340
Author: Johannes Weiner <hannes@...xchg.org>
Date:   Tue May 14 20:26:41 2024 +0000

    mm: vmscan: restore incremental cgroup iteration

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=179315c8980000
start commit:   6dc544b66971 Add linux-next specific files for 20240528
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=145315c8980000
console output: https://syzkaller.appspot.com/x/log.txt?x=105315c8980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6a363b35598e573d
dashboard link: https://syzkaller.appspot.com/bug?extid=17416257cb95200cba44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11e41b72980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15f3d2d2980000

Reported-by: syzbot+17416257cb95200cba44@...kaller.appspotmail.com
Fixes: 6be5e186fd65 ("mm: vmscan: restore incremental cgroup iteration")

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