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Date:   Wed, 21 Jul 2021 19:37:44 +0200
From:   David Sterba <dsterba@...e.cz>
To:     syzbot <syzbot+45d7c243c006f39dc55a@...kaller.appspotmail.com>
Cc:     a@...table.cc, anand.jain@...cle.com,
        b.a.t.m.a.n@...ts.open-mesh.org, catalin.marinas@....com,
        clm@...com, davem@...emloft.net, dsterba@...e.com,
        johannes@...solutions.net, josef@...icpanda.com, kuba@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        mareklindner@...mailbox.ch, netdev@...r.kernel.org,
        sw@...onwunderlich.de, syzkaller-bugs@...glegroups.com,
        will.deacon@....com, will@...nel.org, zlim.lnx@...il.com
Subject: Re: [syzbot] WARNING in sta_info_alloc

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 <dsterba@...e.com>
> 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 <johann...@...el.com>
  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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