================================================================== BUG: KCSAN: data-race in wbt_done / wbt_issue write to 0xffff888141fd1d30 of 8 bytes by task 2130 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+0xd0/0x230 block/blk-mq.c:721 loop_queue_rq+0x3c/0x230 drivers/block/loop.c:2004 blk_mq_dispatch_rq_list+0x570/0xe80 block/blk-mq.c:1369 __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+0x9f/0x110 block/blk-mq-sched.c:341 __blk_mq_run_hw_queue+0xc1/0x140 block/blk-mq.c:1488 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:1820 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x616/0xa70 kernel/workqueue.c:2421 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff888141fd1d30 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+0x27b/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_complete_reqs block/blk-mq.c:576 [inline] blk_done_softirq+0x69/0x90 block/blk-mq.c:581 __do_softirq+0x13c/0x2c3 kernel/softirq.c:345 run_ksoftirqd+0x13/0x20 kernel/softirq.c:652 smpboot_thread_fn+0x34f/0x520 kernel/smpboot.c:165 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================