fs/bcachefs/backpointers.c:396:21: warning: 'bucket.offset' is used uninitialized

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   92e5605a199efbaee59fb19e15d6cc2103a04ec2
commit: 633cf069445d95384d88e9ff40f395c001f8b2b7 bcachefs: Kill bch2_dev_bkey_exists() in backpointer code
date:   6 weeks ago
config: um-randconfig-r081-20240305 (https://download.01.org/0day-ci/archive/20240619/202406191248.wSUI6f8j-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240619/202406191248.wSUI6f8j-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202406191248.wSUI6f8j-lkp@intel.com/

All warnings (new ones prefixed by >>):

   fs/bcachefs/backpointers.c: In function 'bch2_check_btree_backpointer':
>> fs/bcachefs/backpointers.c:396:21: warning: 'bucket.offset' is used uninitialized [-Wuninitialized]
     396 |         struct bpos bucket;
         |                     ^~~~~~


vim +396 fs/bcachefs/backpointers.c

   386	
   387	static int bch2_check_btree_backpointer(struct btree_trans *trans, struct btree_iter *bp_iter,
   388						struct bkey_s_c k)
   389	{
   390		struct bch_fs *c = trans->c;
   391		struct btree_iter alloc_iter = { NULL };
   392		struct bkey_s_c alloc_k;
   393		struct printbuf buf = PRINTBUF;
   394		int ret = 0;
   395	
 > 396		struct bpos bucket;
   397		if (!bp_pos_to_bucket_nodev_noerror(c, k.k->p, &bucket)) {
   398			if (fsck_err(c, backpointer_to_missing_device,
   399				     "backpointer for missing device:\n%s",
   400				     (bch2_bkey_val_to_text(&buf, c, k), buf.buf)))
   401				ret = bch2_btree_delete_at(trans, bp_iter, 0);
   402			goto out;
   403		}
   404	
   405		alloc_k = bch2_bkey_get_iter(trans, &alloc_iter, BTREE_ID_alloc, bucket, 0);
   406		ret = bkey_err(alloc_k);
   407		if (ret)
   408			goto out;
   409	
   410		if (fsck_err_on(alloc_k.k->type != KEY_TYPE_alloc_v4, c,
   411				backpointer_to_missing_alloc,
   412				"backpointer for nonexistent alloc key: %llu:%llu:0\n%s",
   413				alloc_iter.pos.inode, alloc_iter.pos.offset,
   414				(bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
   415			ret = bch2_btree_delete_at(trans, bp_iter, 0);
   416			goto out;
   417		}
   418	out:
   419	fsck_err:
   420		bch2_trans_iter_exit(trans, &alloc_iter);
   421		printbuf_exit(&buf);
   422		return ret;
   423	}
   424	

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