================================================================== BUG: KCSAN: data-race in dd_has_work / deadline_remove_request write to 0xffff888128a5ef18 of 8 bytes by task 11390 on cpu 0: __list_del include/linux/list.h:112 [inline] __list_del_entry include/linux/list.h:135 [inline] list_del_init include/linux/list.h:204 [inline] deadline_remove_request+0x6a/0x180 block/mq-deadline.c:113 deadline_move_request block/mq-deadline.c:176 [inline] __dd_dispatch_request block/mq-deadline.c:365 [inline] dd_dispatch_request+0x6d2/0x740 block/mq-deadline.c:387 blk_mq_do_dispatch_sched+0x15f/0x2b0 block/blk-mq-sched.c:114 __blk_mq_sched_dispatch_requests+0x20f/0x2b0 block/blk-mq-sched.c:245 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_sched_insert_requests+0x14d/0x200 block/blk-mq-sched.c:530 blk_mq_flush_plug_list+0x2f5/0x420 block/blk-mq.c:1817 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1859 blk_finish_plug+0x44/0x60 block/blk-core.c:1876 iomap_dio_rw+0x61b/0x8c0 fs/iomap/direct-io.c:523 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x3bc/0x420 fs/ext4/file.c:129 call_read_iter include/linux/fs.h:1901 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:312 do_splice_to fs/splice.c:870 [inline] splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x562/0xb10 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1576 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1568 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888128a5ef18 of 8 bytes by task 3221 on cpu 1: list_empty_careful include/linux/list.h:301 [inline] dd_has_work+0x8f/0xe0 block/mq-deadline.c:583 blk_mq_do_dispatch_sched+0xa8/0x2b0 block/blk-mq-sched.c:103 __blk_mq_sched_dispatch_requests+0x20f/0x2b0 block/blk-mq-sched.c:245 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_run_work_fn+0x3d/0x50 block/blk-mq.c:1696 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 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3221 Comm: kworker/1:1H Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_run_work_fn ==================================================================