================================================================== BUG: KCSAN: data-race in dd_has_work / deadline_remove_request write to 0xffff888102a73090 of 8 bytes by task 888 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+0x58/0x180 block/mq-deadline-main.c:198 deadline_move_request block/mq-deadline-main.c:274 [inline] __dd_dispatch_request+0x3d3/0x4b0 block/mq-deadline-main.c:472 dd_dispatch_request+0x138/0x1e0 block/mq-deadline-main.c:518 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:149 [inline] blk_mq_do_dispatch_sched+0x1e4/0x640 block/blk-mq-sched.c:214 __blk_mq_sched_dispatch_requests+0x1eb/0x290 block/blk-mq-sched.c:329 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1500 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:1832 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276 worker_thread+0x636/0xae0 kernel/workqueue.c:2422 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 read to 0xffff888102a73090 of 8 bytes by task 620 on cpu 1: list_empty_careful include/linux/list.h:319 [inline] dd_has_work_for_prio block/mq-deadline-main.c:841 [inline] dd_has_work+0x187/0x260 block/mq-deadline-main.c:850 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:137 [inline] blk_mq_do_dispatch_sched+0x12a/0x640 block/blk-mq-sched.c:214 __blk_mq_sched_dispatch_requests+0x1eb/0x290 block/blk-mq-sched.c:329 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1500 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1577 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1630 blk_mq_run_hw_queues+0x1d1/0x230 block/blk-mq.c:1693 blk_mq_requeue_work+0x3ff/0x440 block/blk-mq.c:798 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276 worker_thread+0x636/0xae0 kernel/workqueue.c:2422 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 value changed: 0xffff888102c63108 -> 0xffff888102a73088 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 620 Comm: kworker/1:1H Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_requeue_work ================================================================== ================================================================== BUG: KCSAN: data-race in dd_has_work / dd_insert_request write to 0xffff888102a73090 of 8 bytes by task 9174 on cpu 0: __list_add include/linux/list.h:70 [inline] list_add_tail include/linux/list.h:100 [inline] dd_insert_request+0x31f/0x4c0 block/mq-deadline-main.c:768 dd_insert_requests+0xfe/0x170 block/mq-deadline-main.c:787 blk_mq_sched_insert_request+0x1fc/0x250 block/blk-mq-sched.c:470 blk_mq_submit_bio+0x524/0xe80 block/blk-mq.c:2263 __submit_bio_noacct_mq block/blk-core.c:1013 [inline] submit_bio_noacct+0x6f2/0x7e0 block/blk-core.c:1046 submit_bio+0x10c/0x190 include/linux/vmstat.h:81 submit_bh_wbc+0x2f3/0x330 fs/buffer.c:3050 submit_bh fs/buffer.c:3056 [inline] __sync_dirty_buffer+0x136/0x1e0 fs/buffer.c:3151 sync_dirty_buffer+0x16/0x20 fs/buffer.c:3164 ext4_write_inode+0x285/0x390 fs/ext4/inode.c:5236 write_inode+0x89/0x180 fs/fs-writeback.c:1463 __writeback_single_inode+0x2a2/0x440 fs/fs-writeback.c:1668 writeback_single_inode+0x17b/0x3c0 fs/fs-writeback.c:1723 sync_inode fs/fs-writeback.c:2742 [inline] sync_inode_metadata+0x57/0x80 fs/fs-writeback.c:2762 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0x359/0x670 fs/ext4/fsync.c:170 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2981 [inline] ext4_buffered_write_iter+0x39c/0x3f0 fs/ext4/file.c:277 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519 call_write_iter include/linux/fs.h:2114 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x40a/0x750 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+0x345/0x650 fs/splice.c:891 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888102a73090 of 8 bytes by task 620 on cpu 1: list_empty_careful include/linux/list.h:319 [inline] dd_has_work_for_prio block/mq-deadline-main.c:841 [inline] dd_has_work+0x187/0x260 block/mq-deadline-main.c:850 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:137 [inline] blk_mq_do_dispatch_sched+0x12a/0x640 block/blk-mq-sched.c:214 __blk_mq_sched_dispatch_requests+0x1eb/0x290 block/blk-mq-sched.c:329 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1500 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1577 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1630 blk_mq_run_hw_queues+0x1d1/0x230 block/blk-mq.c:1693 blk_mq_requeue_work+0x3ff/0x440 block/blk-mq.c:798 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276 worker_thread+0x636/0xae0 kernel/workqueue.c:2422 kthread+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 value changed: 0xffff888102a73088 -> 0xffff888102c85a48 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 620 Comm: kworker/1:1H Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_requeue_work ==================================================================