================================================================== BUG: KCSAN: data-race in wbt_done / wbt_issue write to 0xffff888142011e30 of 8 bytes by task 2049 on cpu 0: wbt_issue+0x9e/0xd0 block/blk-wbt.c:610 __rq_qos_issue+0x3b/0x70 block/blk-rq-qos.c:54 rq_qos_issue block/blk-rq-qos.h:159 [inline] blk_mq_start_request+0xc2/0x220 block/blk-mq.c:748 loop_queue_rq+0x3c/0x230 drivers/block/loop.c:1996 blk_mq_dispatch_rq_list+0x5f2/0xe50 block/blk-mq.c:1396 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:186 [inline] blk_mq_do_dispatch_sched+0x370/0x610 block/blk-mq-sched.c:199 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:310 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:341 __blk_mq_run_hw_queue block/blk-mq.c:1515 [inline] blk_mq_run_work_fn+0xb3/0x130 block/blk-mq.c:1793 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x635/0xb90 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff888142011e30 of 8 bytes by interrupt on cpu 1: wbt_done+0x50/0x1c0 block/blk-wbt.c:190 __rq_qos_done+0x3b/0x70 block/blk-rq-qos.c:45 rq_qos_done block/blk-rq-qos.h:153 [inline] blk_mq_free_request+0x270/0x330 block/blk-mq.c:529 __blk_mq_end_request+0x214/0x230 block/blk-mq.c:557 blk_mq_end_request+0x37/0x50 block/blk-mq.c:566 lo_complete_rq+0xca/0x180 drivers/block/loop.c:497 blk_done_softirq+0x145/0x190 block/blk-mq.c:588 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343 run_ksoftirqd+0x13/0x20 kernel/softirq.c:650 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================