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Date:   Tue, 8 Mar 2022 16:09:54 +0300
From:   Dan Carpenter <dan.carpenter@oracle.com>
To:     kbuild@lists.01.org, Qu Wenruo <wqu@suse.com>
Cc:     lkp@intel.com, kbuild-all@lists.01.org,
        linux-kernel@vger.kernel.org, David Sterba <dsterba@suse.com>
Subject: [kdave-btrfs-devel:for-next-20220307 108/147] fs/btrfs/scrub.c:3146
 scrub_raid56_data_stripe_for_parity() error: we previously assumed 'bioc'
 could be null (see line 3138)
Message-ID: <202203081837.zOttrQRN-lkp@intel.com>
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tree:   https://github.com/kdave/btrfs-devel.git for-next-20220307
head:   912dedd70aeb485247c507115704ea7d137d758b
commit: 80cd926eefca522182ee3cf04d8e9984073d34d1 [108/147] btrfs: refactor scrub_raid56_parity()
config: i386-randconfig-m021-20220307 (https://download.01.org/0day-ci/archive/20220308/202203081837.zOttrQRN-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
fs/btrfs/scrub.c:3171 scrub_raid56_data_stripe_for_parity() error: uninitialized symbol 'extent_start'.
fs/btrfs/scrub.c:3172 scrub_raid56_data_stripe_for_parity() error: uninitialized symbol 'extent_size'.

Old smatch warnings:
fs/btrfs/scrub.c:3419 scrub_simple_mirror() error: uninitialized symbol 'ret'.

vim +/bioc +3146 fs/btrfs/scrub.c

093741d4cda2cb4 Qu Wenruo     2022-02-18  3021  
80cd926eefca522 Qu Wenruo     2022-02-18  3022  static int scrub_raid56_data_stripe_for_parity(struct scrub_ctx *sctx,
80cd926eefca522 Qu Wenruo     2022-02-18  3023  					       struct scrub_parity *sparity,
5a6ac9eacb49143 Miao Xie      2014-11-06  3024  					       struct map_lookup *map,
5a6ac9eacb49143 Miao Xie      2014-11-06  3025  					       struct btrfs_device *sdev,
80cd926eefca522 Qu Wenruo     2022-02-18  3026  					       struct btrfs_path *path,
80cd926eefca522 Qu Wenruo     2022-02-18  3027  					       u64 logical)
5a6ac9eacb49143 Miao Xie      2014-11-06  3028  {
fb456252d3d9c05 Jeff Mahoney  2016-06-22  3029  	struct btrfs_fs_info *fs_info = sctx->fs_info;
80cd926eefca522 Qu Wenruo     2022-02-18  3030  	struct btrfs_root *extent_root = btrfs_extent_root(fs_info, logical);
80cd926eefca522 Qu Wenruo     2022-02-18  3031  	struct btrfs_root *csum_root = btrfs_csum_root(fs_info, logical);
5a6ac9eacb49143 Miao Xie      2014-11-06  3032  	struct btrfs_key key;
80cd926eefca522 Qu Wenruo     2022-02-18  3033  	u64 extent_start;
80cd926eefca522 Qu Wenruo     2022-02-18  3034  	u64 extent_size;
80cd926eefca522 Qu Wenruo     2022-02-18  3035  	int ret;
2522dbe86b54ff0 Qu Wenruo     2021-12-14  3036  
80cd926eefca522 Qu Wenruo     2022-02-18  3037  	ASSERT(map->type & BTRFS_BLOCK_GROUP_RAID56_MASK);
5a6ac9eacb49143 Miao Xie      2014-11-06  3038  
80cd926eefca522 Qu Wenruo     2022-02-18  3039  	/* Path should not be populated */
80cd926eefca522 Qu Wenruo     2022-02-18  3040  	ASSERT(!path->nodes[0]);
5a6ac9eacb49143 Miao Xie      2014-11-06  3041  
5a6ac9eacb49143 Miao Xie      2014-11-06  3042  	if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
5a6ac9eacb49143 Miao Xie      2014-11-06  3043  		key.type = BTRFS_METADATA_ITEM_KEY;
5a6ac9eacb49143 Miao Xie      2014-11-06  3044  	else
5a6ac9eacb49143 Miao Xie      2014-11-06  3045  		key.type = BTRFS_EXTENT_ITEM_KEY;
80cd926eefca522 Qu Wenruo     2022-02-18  3046  	key.objectid = logical;
5a6ac9eacb49143 Miao Xie      2014-11-06  3047  	key.offset = (u64)-1;
5a6ac9eacb49143 Miao Xie      2014-11-06  3048  
80cd926eefca522 Qu Wenruo     2022-02-18  3049  	ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
5a6ac9eacb49143 Miao Xie      2014-11-06  3050  	if (ret < 0)
80cd926eefca522 Qu Wenruo     2022-02-18  3051  		return ret;
5a6ac9eacb49143 Miao Xie      2014-11-06  3052  
5a6ac9eacb49143 Miao Xie      2014-11-06  3053  	if (ret > 0) {
80cd926eefca522 Qu Wenruo     2022-02-18  3054  		ret = btrfs_previous_extent_item(extent_root, path, 0);
5a6ac9eacb49143 Miao Xie      2014-11-06  3055  		if (ret < 0)
80cd926eefca522 Qu Wenruo     2022-02-18  3056  			return ret;
5a6ac9eacb49143 Miao Xie      2014-11-06  3057  		if (ret > 0) {
5a6ac9eacb49143 Miao Xie      2014-11-06  3058  			btrfs_release_path(path);
80cd926eefca522 Qu Wenruo     2022-02-18  3059  			ret = btrfs_search_slot(NULL, extent_root, &key, path,
80cd926eefca522 Qu Wenruo     2022-02-18  3060  						0, 0);
5a6ac9eacb49143 Miao Xie      2014-11-06  3061  			if (ret < 0)
80cd926eefca522 Qu Wenruo     2022-02-18  3062  				return ret;
5a6ac9eacb49143 Miao Xie      2014-11-06  3063  		}
5a6ac9eacb49143 Miao Xie      2014-11-06  3064  	}
5a6ac9eacb49143 Miao Xie      2014-11-06  3065  
5a6ac9eacb49143 Miao Xie      2014-11-06  3066  	while (1) {
80cd926eefca522 Qu Wenruo     2022-02-18  3067  		struct btrfs_io_context *bioc = NULL;
80cd926eefca522 Qu Wenruo     2022-02-18  3068  		struct btrfs_device *extent_dev;
80cd926eefca522 Qu Wenruo     2022-02-18  3069  		struct btrfs_extent_item *ei;
80cd926eefca522 Qu Wenruo     2022-02-18  3070  		struct extent_buffer *l;
80cd926eefca522 Qu Wenruo     2022-02-18  3071  		int slot;
80cd926eefca522 Qu Wenruo     2022-02-18  3072  		u64 mapped_length;
80cd926eefca522 Qu Wenruo     2022-02-18  3073  		u64 extent_flags;
80cd926eefca522 Qu Wenruo     2022-02-18  3074  		u64 extent_gen;
80cd926eefca522 Qu Wenruo     2022-02-18  3075  		u64 extent_physical;
80cd926eefca522 Qu Wenruo     2022-02-18  3076  		u64 extent_mirror_num;
5a6ac9eacb49143 Miao Xie      2014-11-06  3077  
5a6ac9eacb49143 Miao Xie      2014-11-06  3078  		l = path->nodes[0];
5a6ac9eacb49143 Miao Xie      2014-11-06  3079  		slot = path->slots[0];
5a6ac9eacb49143 Miao Xie      2014-11-06  3080  		if (slot >= btrfs_header_nritems(l)) {
80cd926eefca522 Qu Wenruo     2022-02-18  3081  			ret = btrfs_next_leaf(extent_root, path);
5a6ac9eacb49143 Miao Xie      2014-11-06  3082  			if (ret == 0)
5a6ac9eacb49143 Miao Xie      2014-11-06  3083  				continue;
5a6ac9eacb49143 Miao Xie      2014-11-06  3084  
80cd926eefca522 Qu Wenruo     2022-02-18  3085  			/* No more extent items or error, exit */
5a6ac9eacb49143 Miao Xie      2014-11-06  3086  			break;
5a6ac9eacb49143 Miao Xie      2014-11-06  3087  		}
5a6ac9eacb49143 Miao Xie      2014-11-06  3088  		btrfs_item_key_to_cpu(l, &key, slot);
5a6ac9eacb49143 Miao Xie      2014-11-06  3089  
d7cad2389560f32 Zhao Lei      2015-07-22  3090  		if (key.type != BTRFS_EXTENT_ITEM_KEY &&
d7cad2389560f32 Zhao Lei      2015-07-22  3091  		    key.type != BTRFS_METADATA_ITEM_KEY)
d7cad2389560f32 Zhao Lei      2015-07-22  3092  			goto next;
d7cad2389560f32 Zhao Lei      2015-07-22  3093  
5a6ac9eacb49143 Miao Xie      2014-11-06  3094  		if (key.type == BTRFS_METADATA_ITEM_KEY)
80cd926eefca522 Qu Wenruo     2022-02-18  3095  			extent_size = fs_info->nodesize;
5a6ac9eacb49143 Miao Xie      2014-11-06  3096  		else
80cd926eefca522 Qu Wenruo     2022-02-18  3097  			extent_size = key.offset;
5a6ac9eacb49143 Miao Xie      2014-11-06  3098  
80cd926eefca522 Qu Wenruo     2022-02-18  3099  		if (key.objectid + extent_size <= logical)
5a6ac9eacb49143 Miao Xie      2014-11-06  3100  			goto next;
5a6ac9eacb49143 Miao Xie      2014-11-06  3101  
80cd926eefca522 Qu Wenruo     2022-02-18  3102  		/* Beyond this data stripe */
80cd926eefca522 Qu Wenruo     2022-02-18  3103  		if (key.objectid >= logical + map->stripe_len)
5a6ac9eacb49143 Miao Xie      2014-11-06  3104  			break;
5a6ac9eacb49143 Miao Xie      2014-11-06  3105  
80cd926eefca522 Qu Wenruo     2022-02-18  3106  		ei = btrfs_item_ptr(l, slot, struct btrfs_extent_item);
80cd926eefca522 Qu Wenruo     2022-02-18  3107  		extent_flags = btrfs_extent_flags(l, ei);
80cd926eefca522 Qu Wenruo     2022-02-18  3108  		extent_gen = btrfs_extent_generation(l, ei);
5a6ac9eacb49143 Miao Xie      2014-11-06  3109  
80cd926eefca522 Qu Wenruo     2022-02-18  3110  		if ((extent_flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) &&
80cd926eefca522 Qu Wenruo     2022-02-18  3111  		    (key.objectid < logical || key.objectid + extent_size >
80cd926eefca522 Qu Wenruo     2022-02-18  3112  		     logical + map->stripe_len)) {
5d163e0e68ce743 Jeff Mahoney  2016-09-20  3113  			btrfs_err(fs_info,
5d163e0e68ce743 Jeff Mahoney  2016-09-20  3114  				  "scrub: tree block %llu spanning stripes, ignored. logical=%llu",
80cd926eefca522 Qu Wenruo     2022-02-18  3115  				  key.objectid, logical);
9799d2c32bef6fb Zhao Lei      2015-08-25  3116  			spin_lock(&sctx->stat_lock);
9799d2c32bef6fb Zhao Lei      2015-08-25  3117  			sctx->stat.uncorrectable_errors++;
9799d2c32bef6fb Zhao Lei      2015-08-25  3118  			spin_unlock(&sctx->stat_lock);
5a6ac9eacb49143 Miao Xie      2014-11-06  3119  			goto next;

This goto next is what triggers the uninitialized variable warnings for
extent_start and extent_size.

5a6ac9eacb49143 Miao Xie      2014-11-06  3120  		}
5a6ac9eacb49143 Miao Xie      2014-11-06  3121  
80cd926eefca522 Qu Wenruo     2022-02-18  3122  		extent_start = key.objectid;
80cd926eefca522 Qu Wenruo     2022-02-18  3123  		ASSERT(extent_size <= U32_MAX);
5a6ac9eacb49143 Miao Xie      2014-11-06  3124  
80cd926eefca522 Qu Wenruo     2022-02-18  3125  		/* Truncate the range inside the data stripe */
80cd926eefca522 Qu Wenruo     2022-02-18  3126  		if (extent_start < logical) {
80cd926eefca522 Qu Wenruo     2022-02-18  3127  			extent_size -= logical - extent_start;
80cd926eefca522 Qu Wenruo     2022-02-18  3128  			extent_start = logical;
80cd926eefca522 Qu Wenruo     2022-02-18  3129  		}
80cd926eefca522 Qu Wenruo     2022-02-18  3130  		if (extent_start + extent_size > logical + map->stripe_len)
80cd926eefca522 Qu Wenruo     2022-02-18  3131  			extent_size = logical + map->stripe_len - extent_start;
5a6ac9eacb49143 Miao Xie      2014-11-06  3132  
80cd926eefca522 Qu Wenruo     2022-02-18  3133  		scrub_parity_mark_sectors_data(sparity, extent_start, extent_size);
5a6ac9eacb49143 Miao Xie      2014-11-06  3134  
80cd926eefca522 Qu Wenruo     2022-02-18  3135  		mapped_length = extent_size;
80cd926eefca522 Qu Wenruo     2022-02-18  3136  		ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, extent_start,
80cd926eefca522 Qu Wenruo     2022-02-18  3137  				      &mapped_length, &bioc, 0);
80cd926eefca522 Qu Wenruo     2022-02-18  3138  		if (!ret && (!bioc || mapped_length < extent_size))
4a770891d9ddf94 Omar Sandoval 2015-06-19  3139  			ret = -EIO;
4a770891d9ddf94 Omar Sandoval 2015-06-19  3140  		if (ret) {
4c6646117912397 Qu Wenruo     2021-09-15  3141  			btrfs_put_bioc(bioc);
80cd926eefca522 Qu Wenruo     2022-02-18  3142  			scrub_parity_mark_sectors_error(sparity, extent_start,
80cd926eefca522 Qu Wenruo     2022-02-18  3143  							extent_size);
80cd926eefca522 Qu Wenruo     2022-02-18  3144  			break;
4a770891d9ddf94 Omar Sandoval 2015-06-19  3145  		}
4c6646117912397 Qu Wenruo     2021-09-15  3146  		extent_physical = bioc->stripes[0].physical;
4c6646117912397 Qu Wenruo     2021-09-15  3147  		extent_mirror_num = bioc->mirror_num;
4c6646117912397 Qu Wenruo     2021-09-15  3148  		extent_dev = bioc->stripes[0].dev;
4c6646117912397 Qu Wenruo     2021-09-15  3149  		btrfs_put_bioc(bioc);
5a6ac9eacb49143 Miao Xie      2014-11-06  3150  
80cd926eefca522 Qu Wenruo     2022-02-18  3151  		ret = btrfs_lookup_csums_range(csum_root, extent_start,
80cd926eefca522 Qu Wenruo     2022-02-18  3152  					       extent_start + extent_size - 1,
5a6ac9eacb49143 Miao Xie      2014-11-06  3153  					       &sctx->csum_list, 1);
5a6ac9eacb49143 Miao Xie      2014-11-06  3154  		if (ret)
80cd926eefca522 Qu Wenruo     2022-02-18  3155  			break;
6fa96d72f79a155 Zhao Lei      2015-07-21  3156  
80cd926eefca522 Qu Wenruo     2022-02-18  3157  		ret = scrub_extent_for_parity(sparity, extent_start,
80cd926eefca522 Qu Wenruo     2022-02-18  3158  					      extent_size, extent_physical,
80cd926eefca522 Qu Wenruo     2022-02-18  3159  					      extent_dev, extent_flags,
80cd926eefca522 Qu Wenruo     2022-02-18  3160  					      extent_gen, extent_mirror_num);
6fa96d72f79a155 Zhao Lei      2015-07-21  3161  		scrub_free_csums(sctx);
6fa96d72f79a155 Zhao Lei      2015-07-21  3162  
5a6ac9eacb49143 Miao Xie      2014-11-06  3163  		if (ret)
5a6ac9eacb49143 Miao Xie      2014-11-06  3164  			break;
5a6ac9eacb49143 Miao Xie      2014-11-06  3165  
5a6ac9eacb49143 Miao Xie      2014-11-06  3166  		cond_resched();
5a6ac9eacb49143 Miao Xie      2014-11-06  3167  next:
5a6ac9eacb49143 Miao Xie      2014-11-06  3168  		path->slots[0]++;
5a6ac9eacb49143 Miao Xie      2014-11-06  3169  	}
80cd926eefca522 Qu Wenruo     2022-02-18  3170  	if (ret < 0)
80cd926eefca522 Qu Wenruo     2022-02-18 @3171  		scrub_parity_mark_sectors_error(sparity, extent_start,
80cd926eefca522 Qu Wenruo     2022-02-18 @3172  						extent_size);
5a6ac9eacb49143 Miao Xie      2014-11-06  3173  	btrfs_release_path(path);
80cd926eefca522 Qu Wenruo     2022-02-18  3174  	return ret;
80cd926eefca522 Qu Wenruo     2022-02-18  3175  }
5a6ac9eacb49143 Miao Xie      2014-11-06  3176  

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0-DAY CI Kernel Test Service, Intel Corporation
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