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

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Date:   Wed, 24 Nov 2021 05:47:06 -0800
From:   syzbot <syzbot+b904a1de3ec43711eba5@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, dvyukov@...gle.com,
        fgheet255t@...il.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,
        willy@...radead.org
Subject: Re: [syzbot] WARNING: refcount bug in sys_memfd_secret

syzbot suspects this issue was fixed by commit:

commit 87066fdd2e30fe9dd531125d95257c118a74617e
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Sun Oct 24 19:48:33 2021 +0000

    Revert "mm/secretmem: use refcount_t instead of atomic_t"

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11cccf06b00000
start commit:   9c0c4d24ac00 Merge tag 'block-5.15-2021-10-22' of git://gi..
git tree:       upstream
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

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: Revert "mm/secretmem: use refcount_t instead of atomic_t"

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