On Wed, Jun 22, 2016 at 06:32:19PM -0700, Liu Bo wrote: > With btrfs-corrupt-block, one can set btree node/leaf's field, if > we assign a negative value to node/leaf, we can get various hangs, > eg. if extent_root's nritems is -2ULL, then we get stuck in > btrfs_read_block_groups() because it has a while loop and > btrfs_search_slot() on extent_root will always return the first > child. > > This lets us know what's happening and returns a EINVAL to callers > instead of returning the first item. > > Signed-off-by: Liu Bo <[email protected]> > --- > fs/btrfs/ctree.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c > index c49a500..915d224 100644 > --- a/fs/btrfs/ctree.c > +++ b/fs/btrfs/ctree.c > @@ -1770,6 +1770,14 @@ static noinline int generic_bin_search(struct > extent_buffer *eb, > unsigned long map_len = 0; > int err; > > + if (low > high) { > + btrfs_err(eb->fs_info, > + "%s: low (%d) < high (%d) eb %llu owner %llu level %d",
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