On Sun, Apr 29, 2018 at 03:59:42PM +0800, ethanwu wrote:
> In preivous patch:
> Btrfs: kill trans in run_delalloc_nocow and btrfs_cross_ref_exist
If you know which patch introduced the bug, please add it with the
commit id and as
Fixes: e4c3b2dcd144 ("Btrfs: kill trans in run_delalloc_nocow and btrfs_cross_ref_exist")
to the tags (signed-off section).
> We avoid starting btrfs transaction and get this information from
> fs_info->running_transaction directly.
>
> When accessing running_transaction in check_delayed_ref, there's a
> chance that current transaction will be freed by commit transaction
> after the NULL pointer check of running_transaction is passed.
>
> After looking all the other places using fs_info->running_transaction,
> they are either protected by trans_lock or holding the transactions.
>
> Fix this by using trans_lock and increasing the use_count.
>
> Signed-off-by: ethanwu <ethanwu@xxxxxxxxxxxx>
Added to next, thanks.
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