================================================================== BUG: KCSAN: data-race in blk_mq_run_hw_queue / blk_mq_sched_insert_request read to 0xffff88812a05b010 of 8 bytes by task 15408 on cpu 0: list_empty_careful include/linux/list.h:287 [inline] blk_mq_hctx_has_pending block/blk-mq.c:69 [inline] blk_mq_run_hw_queue+0x10e/0x1c0 block/blk-mq.c:1469 blk_mq_sched_insert_requests+0x198/0x260 block/blk-mq-sched.c:444 blk_mq_flush_plug_list+0x572/0x6c0 block/blk-mq.c:1733 blk_flush_plug_list+0x271/0x2a0 block/blk-core.c:1768 blk_finish_plug block/blk-core.c:1785 [inline] blk_finish_plug+0x60/0x84 block/blk-core.c:1781 iomap_dio_rw+0x909/0x9a0 fs/iomap/direct-io.c:520 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter fs/ext4/file.c:128 [inline] ext4_file_read_iter+0x2e4/0x380 fs/ext4/file.c:113 call_read_iter include/linux/fs.h:1896 [inline] generic_file_splice_read+0x35c/0x500 fs/splice.c:313 do_splice_to+0xf2/0x130 fs/splice.c:892 splice_direct_to_actor+0x1b6/0x540 fs/splice.c:971 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff88812a05b010 of 8 bytes by task 2499 on cpu 1: __list_add include/linux/list.h:63 [inline] list_add include/linux/list.h:79 [inline] blk_mq_sched_bypass_insert block/blk-mq-sched.c:367 [inline] blk_mq_sched_insert_request+0x2fd/0x3f0 block/blk-mq-sched.c:394 blk_mq_requeue_work+0x370/0x460 block/blk-mq.c:738 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264 worker_thread+0xa0/0x800 kernel/workqueue.c:2410 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: 2499 Comm: kworker/1:1H Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_requeue_work ==================================================================