From: Filipe Manana <fdmanana@gmail.com>
To: Qu Wenruo <wqu@suse.com>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>,
David Sterba <dsterba@suse.com>
Subject: Re: [PATCH 1/3] btrfs: tree-checker: Fix false alerts on log trees
Date: Fri, 4 Oct 2019 15:15:51 +0100 [thread overview]
Message-ID: <CAL3q7H5TdwA5tJL-SFKGCozwexmhwWHnCvHgqucdmw=xB+MgCw@mail.gmail.com> (raw)
In-Reply-To: <20191004093133.83582-2-wqu@suse.com>
On Fri, Oct 4, 2019 at 11:27 AM Qu Wenruo <wqu@suse.com> wrote:
>
> [BUG]
> When running btrfs/063 in a loop, we got the following random write time
> tree checker error:
>
> BTRFS critical (device dm-4): corrupt leaf: root=18446744073709551610 block=33095680 slot=2 ino=307 file_offset=0, invalid previous key objectid, have 305 expect 307
> BTRFS info (device dm-4): leaf 33095680 gen 7 total ptrs 47 free space 12146 owner 18446744073709551610
> BTRFS info (device dm-4): refs 1 lock (w:0 r:0 bw:0 br:0 sw:0 sr:0) lock_owner 0 current 26176
> item 0 key (305 1 0) itemoff 16123 itemsize 160
> inode generation 0 size 0 mode 40777
> item 1 key (305 12 257) itemoff 16111 itemsize 12
> item 2 key (307 108 0) itemoff 16058 itemsize 53 <<<
> extent data disk bytenr 0 nr 0
> extent data offset 0 nr 614400 ram 671744
> item 3 key (307 108 614400) itemoff 16005 itemsize 53
> extent data disk bytenr 195342336 nr 57344
> extent data offset 0 nr 53248 ram 57344
> item 4 key (307 108 667648) itemoff 15952 itemsize 53
> extent data disk bytenr 194048000 nr 4096
> extent data offset 0 nr 4096 ram 4096
> [...]
> BTRFS error (device dm-4): block=33095680 write time tree block corruption detected
> BTRFS: error (device dm-4) in btrfs_commit_transaction:2332: errno=-5 IO failure (Error while writing out transaction)
> BTRFS info (device dm-4): forced readonly
> BTRFS warning (device dm-4): Skipping commit of aborted transaction.
> BTRFS info (device dm-4): use zlib compression, level 3
> BTRFS: error (device dm-4) in cleanup_transaction:1890: errno=-5 IO failure
>
> [CAUSE]
> Commit 59b0d030fb30 ("btrfs: tree-checker: Try to detect missing INODE_ITEM")
> assumes all XATTR_ITEM/DIR_INDEX/DIR_ITEM/INODE_REF/EXTENT_DATA items
> should have previous key with the same objectid as ino.
>
> But it's only true for fs trees. For log-tree, we can get above log tree
> block where an EXTENT_DATA item has no previous key with the same ino.
> As log tree only records modified items, it won't record unmodified
> items like INODE_ITEM.
>
> So this triggers write time tree check warning.
>
> [FIX]
> As a quick fix, check header owner to skip the previous key if it's not
> fs tree (log tree doesn't count as fs tree).
>
> This fix is only to be merged as a quick fix.
> There will be a more comprehensive fix to refactor the common check into
> one function.
>
> Reported-by: David Sterba <dsterba@suse.com>
> Fixes: 59b0d030fb30 ("btrfs: tree-checker: Try to detect missing INODE_ITEM")
So this is bogus, since that commit is not in Linus' tree, and once it
gets there its ID changes.
More likely, this will get squashed into that commit in misc-next
since we are still far from the 5.5 merge window.
> Signed-off-by: Qu Wenruo <wqu@suse.com>
Anyway, the change looks fine to me.
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Thanks.
> ---
> fs/btrfs/tree-checker.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
> index b8f82d9be9f0..5e34cd5e3e2e 100644
> --- a/fs/btrfs/tree-checker.c
> +++ b/fs/btrfs/tree-checker.c
> @@ -148,7 +148,8 @@ static int check_extent_data_item(struct extent_buffer *leaf,
> * But if objectids mismatch, it means we have a missing
> * INODE_ITEM.
> */
> - if (slot > 0 && prev_key->objectid != key->objectid) {
> + if (slot > 0 && is_fstree(btrfs_header_owner(leaf)) &&
> + prev_key->objectid != key->objectid) {
> file_extent_err(leaf, slot,
> "invalid previous key objectid, have %llu expect %llu",
> prev_key->objectid, key->objectid);
> @@ -322,7 +323,8 @@ static int check_dir_item(struct extent_buffer *leaf,
> u32 cur = 0;
>
> /* Same check as in check_extent_data_item() */
> - if (slot > 0 && prev_key->objectid != key->objectid) {
> + if (slot > 0 && is_fstree(btrfs_header_owner(leaf)) &&
> + prev_key->objectid != key->objectid) {
> dir_item_err(leaf, slot,
> "invalid previous key objectid, have %llu expect %llu",
> prev_key->objectid, key->objectid);
> --
> 2.23.0
>
--
Filipe David Manana,
“Whether you think you can, or you think you can't — you're right.”
next prev parent reply other threads:[~2019-10-04 14:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-04 9:31 [PATCH 0/3] btrfs: tree-checker: False alerts fixes for log trees Qu Wenruo
2019-10-04 9:31 ` [PATCH 1/3] btrfs: tree-checker: Fix false alerts on " Qu Wenruo
2019-10-04 13:52 ` Nikolay Borisov
2019-10-04 14:13 ` Filipe Manana
2019-10-04 14:19 ` Nikolay Borisov
2019-10-04 14:15 ` Filipe Manana [this message]
2019-10-07 15:31 ` David Sterba
2019-10-04 9:31 ` [PATCH 2/3] btrfs: tree-checker: Refactor prev_key check for ino into a function Qu Wenruo
2019-10-04 9:31 ` [PATCH 3/3] btrfs: Enhance the error outputting for write time tree checker Qu Wenruo
2019-10-07 16:46 ` [PATCH 0/3] btrfs: tree-checker: False alerts fixes for log trees David Sterba
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