linux-kernel - block/blk-zoned.c:579:5-24: WARNING: atomic_dec_and_test variation before object free at line 583.

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Message-ID: <202411050650.ilIZa8S7-lkp@intel.com>
Date: Tue, 5 Nov 2024 06:52:25 +0800
From: kernel test robot <lkp@...el.com>
To: Damien Le Moal <dlemoal@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
	Hannes Reinecke <hare@...e.de>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Bart Van Assche <bvanassche@....org>
Subject: block/blk-zoned.c:579:5-24: WARNING: atomic_dec_and_test variation
 before object free at line 583.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   557329bcecc2f55e134db8974953b32b69db9d15
commit: dd291d77cc90eb6a86e9860ba8e6e38eebd57d12 block: Introduce zone write plugging
date:   7 months ago
config: alpha-randconfig-r064-20241105 (https://download.01.org/0day-ci/archive/20241105/202411050650.ilIZa8S7-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.3.0

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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411050650.ilIZa8S7-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> block/blk-zoned.c:579:5-24: WARNING: atomic_dec_and_test variation before object free at line 583.

vim +579 block/blk-zoned.c

   576	
   577	static inline void disk_put_zone_wplug(struct blk_zone_wplug *zwplug)
   578	{
 > 579		if (atomic_dec_and_test(&zwplug->ref)) {
   580			WARN_ON_ONCE(!bio_list_empty(&zwplug->bio_list));
   581			WARN_ON_ONCE(!list_empty(&zwplug->link));
   582	
 > 583			call_rcu(&zwplug->rcu_head, disk_free_zone_wplug_rcu);
   584		}
   585	}
   586	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki