================================================================== BUG: KCSAN: data-race in __blk_mq_sched_dispatch_requests / blk_mq_run_hw_queue write to 0xffff8881296d5410 of 8 bytes by task 3223 on cpu 0: INIT_LIST_HEAD include/linux/list.h:36 [inline] list_splice_init include/linux/list.h:465 [inline] __blk_mq_sched_dispatch_requests+0x174/0x2b0 block/blk-mq-sched.c:224 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:276 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1418 __blk_mq_delay_run_hw_queue+0x199/0x340 block/blk-mq.c:1495 blk_mq_run_hw_queue+0x22e/0x260 block/blk-mq.c:1548 blk_mq_run_hw_queues block/blk-mq.c:1566 [inline] blk_mq_requeue_work+0x433/0x4a0 block/blk-mq.c:774 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 read to 0xffff8881296d5410 of 8 bytes by interrupt on cpu 1: list_empty_careful include/linux/list.h:301 [inline] blk_mq_hctx_has_pending block/blk-mq.c:70 [inline] blk_mq_run_hw_queue+0x12b/0x260 block/blk-mq.c:1544 blk_mq_run_hw_queues+0xa2/0x100 block/blk-mq.c:1566 scsi_run_queue_async drivers/scsi/scsi_lib.c:556 [inline] scsi_end_request+0x386/0x400 drivers/scsi/scsi_lib.c:603 scsi_io_completion+0x105/0xf40 drivers/scsi/scsi_lib.c:939 scsi_finish_command+0x277/0x2c0 drivers/scsi/scsi.c:214 scsi_softirq_done+0x271/0x400 drivers/scsi/scsi_lib.c:1465 blk_done_softirq+0x1a5/0x200 block/blk-softirq.c:37 __do_softirq+0x198/0x360 kernel/softirq.c:292 run_ksoftirqd+0x2f/0x60 kernel/softirq.c:630 smpboot_thread_fn+0x347/0x530 kernel/smpboot.c:165 kthread+0x20d/0x230 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.8.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================