tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.4 head: d2c5af89e80c5b71f1da59879464a930947306a2 commit: b9261330db0b8da110db4761197e9601d4d4124d [112/132] btrfs: avoid double put of block group when emptying cluster config: arm-randconfig-r023-20210318 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 436c6c9c20cc522c92a923440a5fc509c342a7db) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.4 git checkout b9261330db0b8da110db4761197e9601d4d4124d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): return; ^ 1 error generated. vim +/__btrfs_return_cluster_to_free_space +2555 fs/btrfs/free-space-cache.c 2536 2537 /* 2538 * for a given cluster, put all of its extents back into the free 2539 * space cache. If the block group passed doesn't match the block group 2540 * pointed to by the cluster, someone else raced in and freed the 2541 * cluster already. In that case, we just return without changing anything 2542 */ 2543 static int 2544 __btrfs_return_cluster_to_free_space( 2545 struct btrfs_block_group_cache *block_group, 2546 struct btrfs_free_cluster *cluster) 2547 { 2548 struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; 2549 struct btrfs_free_space *entry; 2550 struct rb_node *node; 2551 2552 spin_lock(&cluster->lock); 2553 if (cluster->block_group != block_group) { 2554 spin_unlock(&cluster->lock); 2556 } 2557 2558 cluster->block_group = NULL; 2559 cluster->window_start = 0; 2560 list_del_init(&cluster->block_group_list); 2561 2562 node = rb_first(&cluster->root); 2563 while (node) { 2564 bool bitmap; 2565 2566 entry = rb_entry(node, struct btrfs_free_space, offset_index); 2567 node = rb_next(&entry->offset_index); 2568 rb_erase(&entry->offset_index, &cluster->root); 2569 RB_CLEAR_NODE(&entry->offset_index); 2570 2571 bitmap = (entry->bitmap != NULL); 2572 if (!bitmap) { 2573 try_merge_free_space(ctl, entry, false); 2574 steal_from_bitmap(ctl, entry, false); 2575 } 2576 tree_insert_offset(&ctl->free_space_offset, 2577 entry->offset, &entry->offset_index, bitmap); 2578 } 2579 cluster->root = RB_ROOT; 2580 spin_unlock(&cluster->lock); 2581 btrfs_put_block_group(block_group); 2582 return 0; 2583 } 2584 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org