On Fri, Jul 16, 2021 at 04:07:06PM -0700, syzbot wrote:

syzbot suspects this issue was fixed by commit:

commit 282ab3ff16120ec670fe3330e85f8ebf13092f21
Author: David Sterba [off-list ref]
Date:   Mon Oct 14 12:38:33 2019 +0000

    btrfs: reduce compressed_bio members' types

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12d5f6f2300000
start commit:   7f75285ca572 Merge tag 'for-5.12/dm-fixes-3' of git://git...
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=b5591c832f889fd9
dashboard link: https://syzkaller.appspot.com/bug?extid=45d7c243c006f39dc55a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=164f385ad00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1427af9ad00000

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

#syz fix: btrfs: reduce compressed_bio members' types

            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

That's completely unrelated and probably result of unreliable
biscection. There's a different patch referenced in the dashboard

https://groups.google.com/g/syzkaller-lts-bugs/c/ntHpclbYBMM/m/WG3hW1DvAgAJ

  commit 25487a5ff100398cb214ae854358609e4bbd4e7d
  Author: Johannes Berg [off-list ref]
  Date: Mon May 17 14:47:17 2021 +0000

  mac80211: remove warning in ieee80211_get_sband()

that looks more relevant but I don't know if it's the real fix.

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