linux-kernel - Re: [syzbot] [btrfs?] kernel BUG in prepare_to

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Date:   Tue, 1 Aug 2023 04:39:20 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Qu Wenruo <quwenruo.btrfs@....com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Christoph Hellwig <hch@....de>,
        syzbot <syzbot+ae97a827ae1c3336bbb4@...kaller.appspotmail.com>,
        clm@...com, dsterba@...e.com, johannes.thumshirn@....com,
        josef@...icpanda.com, linux-btrfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] kernel BUG in prepare_to_merge

With misc-next and your debug patch I first ran into another assert:

[  250.848976][T35903] assertion failed: 0, in fs/btrfs/relocation.c:2042
[  250.849963][T35903] ------------[ cut here ]------------
[  250.850472][T35903] kernel BUG at fs/btrfs/relocation.c:2042!

and here is the output from your assert:

[ 1378.272143][T189001] BTRFS error (device loop1): reloc tree mismatch, root 8 has no reloc root, expect reloc root key (-8, 132, 8) gen 17
[ 1378.274019][T189001] ------------[ cut here ]------------
[ 1378.274540][T189001] BTRFS: Transaction aborted (error -117)
[ 1378.277110][T189001] WARNING: CPU: 3 PID: 189001 at fs/btrfs/relocation.c:1946 prepare_to_merge+0x10e0/0x1460