================================================================== BUG: KCSAN: data-race in __blk_mq_requeue_request / bt_tags_for_each write to 0xffff888103218220 of 4 bytes by task 74 on cpu 1: __blk_mq_put_driver_tag block/blk-mq.h:256 [inline] blk_mq_put_driver_tag block/blk-mq.h:269 [inline] __blk_mq_requeue_request+0x9f/0x2b0 block/blk-mq.c:1426 blk_mq_handle_dev_resource block/blk-mq.c:1927 [inline] blk_mq_dispatch_rq_list+0x9a2/0x11f0 block/blk-mq.c:2068 __blk_mq_sched_dispatch_requests+0x1ab/0x260 block/blk-mq-sched.c:305 blk_mq_sched_dispatch_requests+0x93/0x100 block/blk-mq-sched.c:338 __blk_mq_run_hw_queue+0x8e/0x110 block/blk-mq.c:2177 __blk_mq_delay_run_hw_queue+0xb3/0x3a0 block/blk-mq.c:2253 blk_mq_run_hw_queue+0x19f/0x330 block/blk-mq.c:2301 blk_mq_run_hw_queues+0x15b/0x1e0 block/blk-mq.c:2349 scsi_run_queue+0x55a/0x580 drivers/scsi/scsi_lib.c:456 scsi_requeue_run_queue+0x25/0x30 drivers/scsi/scsi_lib.c:466 process_one_work+0x3e6/0x750 kernel/workqueue.c:2390 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2537 kthread+0x1a6/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 read to 0xffff888103218220 of 4 bytes by task 41 on cpu 0: blk_mq_find_and_get_req block/blk-mq-tag.c:253 [inline] bt_tags_iter block/blk-mq-tag.c:349 [inline] __sbitmap_for_each_set include/linux/sbitmap.h:281 [inline] sbitmap_for_each_set include/linux/sbitmap.h:302 [inline] bt_tags_for_each+0x2e2/0x500 block/blk-mq-tag.c:384 __blk_mq_all_tag_iter block/blk-mq-tag.c:395 [inline] blk_mq_tagset_busy_iter+0x114/0x150 block/blk-mq-tag.c:439 scsi_host_busy+0x4f/0x80 drivers/scsi/hosts.c:603 scsi_host_queue_ready drivers/scsi/scsi_lib.c:1344 [inline] scsi_queue_rq+0x30a/0x1990 drivers/scsi/scsi_lib.c:1734 blk_mq_dispatch_rq_list+0x7b1/0x11f0 block/blk-mq.c:2059 __blk_mq_sched_dispatch_requests+0x1ab/0x260 block/blk-mq-sched.c:305 blk_mq_sched_dispatch_requests+0x93/0x100 block/blk-mq-sched.c:338 __blk_mq_run_hw_queue+0x8e/0x110 block/blk-mq.c:2177 blk_mq_run_work_fn+0x41/0x50 block/blk-mq.c:2476 process_one_work+0x3e6/0x750 kernel/workqueue.c:2390 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2537 kthread+0x1a6/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 value changed: 0x0000056a -> 0xffffffff Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 41 Comm: kworker/0:1H Not tainted 6.3.0-rc5-syzkaller-00032-g99ddf2254feb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: kblockd blk_mq_run_work_fn ==================================================================