linux-kernel - Re: [syzbot] [ntfs3?] WARNING in attr_data_get

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Message-ID: <00000000000040020d05fcf58ebf@google.com>
Date:   Tue, 30 May 2023 21:14:27 -0700
From:   syzbot <syzbot+a98f21ebda0a437b04d7@...kaller.appspotmail.com>
To:     almaz.alexandrovich@...agon-software.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        ntfs3@...ts.linux.dev, syzkaller-bugs@...glegroups.com,
        torvalds@...ux-foundation.org
Subject: Re: [syzbot] [ntfs3?] WARNING in attr_data_get_block (2)

syzbot suspects this issue was fixed by commit:

commit 68674f94ffc9dddc45e7733963ecc35c5eda9efd
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Sat Apr 15 18:47:06 2023 +0000

    x86: don't use REP_GOOD or ERMS for small memory copies

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12de3271280000
start commit:   ffe78bbd5121 Merge tag 'xtensa-20230327' of https://github..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=9c35b3803e5ad668
dashboard link: https://syzkaller.appspot.com/bug?extid=a98f21ebda0a437b04d7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=139dca3ec80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15a55a35c80000

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

#syz fix: x86: don't use REP_GOOD or ERMS for small memory copies

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