================================================================== BUG: KCSAN: data-race in dd_has_work / dd_insert_request write to 0xffff888103593698 of 8 bytes by task 9539 on cpu 0: __list_add include/linux/list.h:72 [inline] list_add_tail include/linux/list.h:102 [inline] dd_insert_request+0x415/0x550 block/mq-deadline.c:758 dd_insert_requests+0xfc/0x140 block/mq-deadline.c:777 blk_mq_sched_insert_requests+0xc0/0x2a0 block/blk-mq-sched.c:477 blk_mq_dispatch_plug_list+0x1e9/0x2c0 block/blk-mq.c:2597 blk_mq_flush_plug_list+0x2ea/0x340 block/blk-mq.c:2639 __blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1240 blk_finish_plug+0x44/0x60 block/blk-core.c:1264 __iomap_dio_rw+0xc50/0xf80 fs/iomap/direct-io.c:599 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:681 ext4_dio_write_iter fs/ext4/file.c:566 [inline] ext4_file_write_iter+0x7df/0xdf0 fs/ext4/file.c:677 do_iter_readv_writev+0x27b/0x300 do_iter_write+0x16f/0x5c0 fs/read_write.c:852 vfs_iter_write+0x4c/0x70 fs/read_write.c:893 iter_file_splice_write+0x44a/0x7c0 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x660 fs/splice.c:891 do_splice_direct+0xfb/0x180 fs/splice.c:979 do_sendfile+0x3ad/0x900 fs/read_write.c:1246 __do_sys_sendfile64 fs/read_write.c:1311 [inline] __se_sys_sendfile64 fs/read_write.c:1297 [inline] __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1297 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888103593698 of 8 bytes by task 73 on cpu 1: list_empty_careful include/linux/list.h:329 [inline] dd_has_work_for_prio block/mq-deadline.c:837 [inline] dd_has_work+0x188/0x260 block/mq-deadline.c:846 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:109 [inline] blk_mq_do_dispatch_sched+0x148/0x780 block/blk-mq-sched.c:187 __blk_mq_sched_dispatch_requests+0x1ca/0x270 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:339 __blk_mq_run_hw_queue+0x7e/0x100 block/blk-mq.c:1974 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:2312 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289 worker_thread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 value changed: 0xffff888103593690 -> 0xffff8881035ca948 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 73 Comm: kworker/1:1H Not tainted 5.18.0-rc6-syzkaller-00148-gec7f49619d8e-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_run_work_fn ==================================================================