================================================================== BUG: KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests write to 0xffff888129a16550 of 8 bytes by task 10431 on cpu 0: blk_mq_sched_dispatch_requests+0x118/0x380 block/blk-mq-sched.c:181 __blk_mq_run_hw_queue+0xb7/0x160 block/blk-mq.c:1403 __blk_mq_delay_run_hw_queue+0x31b/0x3a0 block/blk-mq.c:1471 blk_mq_run_hw_queue+0x103/0x1c0 block/blk-mq.c:1508 blk_mq_sched_insert_requests+0x1ca/0x2e0 block/blk-mq-sched.c:444 blk_mq_flush_plug_list+0x572/0x6c0 block/blk-mq.c:1772 blk_flush_plug_list+0x271/0x2a0 block/blk-core.c:1766 blk_finish_plug block/blk-core.c:1783 [inline] blk_finish_plug+0x60/0x84 block/blk-core.c:1779 read_pages+0xbc/0x2d0 mm/readahead.c:142 __do_page_cache_readahead+0x353/0x390 mm/readahead.c:212 ra_submit mm/internal.h:62 [inline] ondemand_readahead+0x35d/0x710 mm/readahead.c:492 page_cache_sync_readahead+0x1ad/0x1e0 mm/readahead.c:527 generic_file_buffered_read mm/filemap.c:2050 [inline] generic_file_read_iter+0xeb6/0x1440 mm/filemap.c:2323 ext4_file_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0xfa/0x240 fs/ext4/file.c:65 read to 0xffff888129a16550 of 8 bytes by task 2493 on cpu 1: blk_mq_sched_dispatch_requests+0x104/0x380 block/blk-mq-sched.c:181 __blk_mq_run_hw_queue+0xb7/0x160 block/blk-mq.c:1403 __blk_mq_delay_run_hw_queue+0x31b/0x3a0 block/blk-mq.c:1471 blk_mq_run_hw_queue+0x103/0x1c0 block/blk-mq.c:1508 blk_mq_run_hw_queues+0xac/0xf0 block/blk-mq.c:1525 blk_mq_requeue_work+0x3a9/0x460 block/blk-mq.c:775 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2493 Comm: kworker/1:1H Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_requeue_work ==================================================================