In Yang Ruirui's mail, the btrfs will create a oops. This is caused by a null pointer in test_range_bit() while lock the spinlock.
So, It is necessary to add a pointer check into test_range_bit() --- Signed-off-by: Liu Wenyi <qingshen...@gmail.com> --- fs/btrfs/extent_io.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 5e7a94d..0da42b5 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1553,6 +1553,9 @@ int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, struct rb_node *node; int bitset = 0; + if (tree == NULL) + return bitset; + spin_lock(&tree->lock); if (cached && cached->tree && cached->start == start) node = &cached->rb_node; -- 1.7.3.3 --- Best Regards, Liu Wenyi -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html