linux-kernel - Re: [syzbot] [xfs?] BUG: unable to handle kernel paging request in clear_user_rep

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Message-ID: <0000000000001ec6ce05fa9a4bf7@google.com>
Date:   Sun, 30 Apr 2023 21:31:15 -0700
From:   syzbot <syzbot+401145a9a237779feb26@...kaller.appspotmail.com>
To:     almaz.alexandrovich@...agon-software.com, clm@...com,
        djwong@...nel.org, dsterba@...e.com, hch@...radead.org,
        josef@...icpanda.com, linux-btrfs@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        ntfs3@...ts.linux.dev, syzkaller-bugs@...glegroups.com,
        torvalds@...ux-foundation.org, willy@...radead.org
Subject: Re: [syzbot] [xfs?] BUG: unable to handle kernel paging request in clear_user_rep_good

syzbot suspects this issue was fixed by commit:

commit d2c95f9d6802cc518d71d9795f4d9da54fb4e24d
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Sat Apr 15 20:22:31 2023 +0000

    x86: don't use REP_GOOD or ERMS for user memory clearing

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13636ffc280000
start commit:   ab072681eabe Merge tag 'irq_urgent_for_v6.2_rc6' of git://..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=23330449ad10b66f
dashboard link: https://syzkaller.appspot.com/bug?extid=401145a9a237779feb26
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13b3ba9e480000

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 user memory clearing

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