================================================================== BUG: KCSAN: data-race in __blk_mq_sched_dispatch_requests / blk_mq_request_bypass_insert write to 0xffff8881027ae010 of 8 bytes by task 52 on cpu 0: __list_add include/linux/list.h:70 [inline] list_add include/linux/list.h:86 [inline] blk_mq_request_bypass_insert+0x6a/0x150 block/blk-mq.c:1859 blk_mq_sched_insert_request+0xfc/0x250 block/blk-mq-sched.c:462 blk_mq_requeue_work+0x3cb/0x440 block/blk-mq.c:795 process_one_work+0x402/0x910 kernel/workqueue.c:2297 worker_thread+0x636/0xae0 kernel/workqueue.c:2444 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 read to 0xffff8881027ae010 of 8 bytes by task 199 on cpu 1: list_empty_careful include/linux/list.h:319 [inline] __blk_mq_sched_dispatch_requests+0x80/0x290 block/blk-mq-sched.c:305 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1480 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:1812 process_one_work+0x402/0x910 kernel/workqueue.c:2297 worker_thread+0x636/0xae0 kernel/workqueue.c:2444 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 value changed: 0xffff8881027ae008 -> 0xffff8881027b7c48 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 199 Comm: kworker/1:1H Tainted: G W 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_run_work_fn ==================================================================