================================================================== BUG: KCSAN: data-race in dd_has_work / deadline_remove_request write to 0xffff88812896c618 of 8 bytes by task 2055 on cpu 1: __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 block/blk-mq-sched.c:152 [inline] blk_mq_do_dispatch_sched+0x1df/0x610 block/blk-mq-sched.c:205 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:316 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:347 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1525 __blk_mq_delay_run_hw_queue+0x199/0x340 block/blk-mq.c:1602 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1655 blk_mq_sched_insert_requests+0x14d/0x200 block/blk-mq-sched.c:601 blk_mq_flush_plug_list+0x2f5/0x420 block/blk-mq.c:1924 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1867 blk_finish_plug+0x44/0x60 block/blk-core.c:1884 iomap_dio_rw+0x5ed/0x980 fs/iomap/direct-io.c:528 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x3be/0x420 fs/ext4/file.c:129 call_read_iter include/linux/fs.h:1876 [inline] generic_file_splice_read+0x22b/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+0x56a/0xba0 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812896c618 of 8 bytes by task 2054 on cpu 0: list_empty_careful include/linux/list.h:319 [inline] dd_has_work+0x98/0xe0 block/mq-deadline.c:583 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:141 [inline] blk_mq_do_dispatch_sched+0x138/0x610 block/blk-mq-sched.c:205 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:316 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:347 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1525 __blk_mq_delay_run_hw_queue+0x199/0x340 block/blk-mq.c:1602 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1655 blk_mq_sched_insert_requests+0x14d/0x200 block/blk-mq-sched.c:601 blk_mq_flush_plug_list+0x2f5/0x420 block/blk-mq.c:1924 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1867 blk_finish_plug+0x44/0x60 block/blk-core.c:1884 iomap_dio_rw+0x5ed/0x980 fs/iomap/direct-io.c:528 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x3be/0x420 fs/ext4/file.c:129 call_read_iter include/linux/fs.h:1876 [inline] generic_file_splice_read+0x22b/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+0x56a/0xba0 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 2054 Comm: syz-executor.1 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================