On Tue, Mar 08, 2022 at 04:09:54PM +0300, Dan Carpenter wrote:
> 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/[email protected]/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 <[email protected]>
> Reported-by: Dan Carpenter <[email protected]>
>
> 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;
Oops. I misread what Smatch was doing. It's this break that it's
complaining about. "ret" is negative and "extent_start" is uninitialized
on the first iteration through the loop.
The goto would not trigger the warning.
> 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;
On this break "ret" is zero so it wouldn't trigger an error.
> 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.
No. This is fine.
>
> 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;
And anything after this is fine.
regards,
dan carpenter
> 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
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/[email protected]
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