linux-kernel - Re: [syzbot] WARNING: refcount bug in sys_memfd

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Date:   Sat, 23 Oct 2021 15:31:06 -0700
From:   syzbot <syzbot+b904a1de3ec43711eba5@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, dvyukov@...gle.com,
        fmdefrancesco@...il.com, jordy@...dyzomer.github.io,
        jordy@...ing.systems, keescook@...omium.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, rppt@...nel.org,
        syzkaller-bugs@...glegroups.com, torvalds@...ux-foundation.org
Subject: Re: [syzbot] WARNING: refcount bug in sys_memfd_secret

syzbot has bisected this issue to:

commit 110860541f443f950c1274f217a1a3e298670a33
Author: Jordy Zomer <jordy@...dyzomer.github.io>
Date:   Wed Sep 8 02:56:18 2021 +0000

    mm/secretmem: use refcount_t instead of atomic_t

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=141a071cb00000
start commit:   9c0c4d24ac00 Merge tag 'block-5.15-2021-10-22' of git://gi..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=161a071cb00000
console output: https://syzkaller.appspot.com/x/log.txt?x=121a071cb00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=be398dd7862f4b36
dashboard link: https://syzkaller.appspot.com/bug?extid=b904a1de3ec43711eba5
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=130cabdcb00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=175b91acb00000

Reported-by: syzbot+b904a1de3ec43711eba5@...kaller.appspotmail.com
Fixes: 110860541f44 ("mm/secretmem: use refcount_t instead of atomic_t")

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