syzbot

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BUG: KCSAN: data-race in __mod_timer / blk_add_timer

write to 0xffff8881019d4cb0 of 8 bytes by task 9 on cpu 0:
 __mod_timer+0x70d/0xc40 kernel/time/timer.c:1105
 mod_timer+0x1b/0x20 kernel/time/timer.c:1161
 blk_mq_timeout_work+0xd7/0x2a0 block/blk-mq.c:1515
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffff8881019d4cb0 of 8 bytes by task 42 on cpu 1:
 blk_add_timer+0x114/0x190
 blk_mq_start_request+0xf3/0x280 block/blk-mq.c:1152
 scsi_queue_rq+0x13d8/0x1570 drivers/scsi/scsi_lib.c:1744
 blk_mq_dispatch_rq_list+0x544/0x1210 block/blk-mq.c:1902
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:173 [inline]
 blk_mq_do_dispatch_sched+0x49d/0x7f0 block/blk-mq-sched.c:187
 __blk_mq_sched_dispatch_requests+0x1cd/0x270
 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:339
 __blk_mq_run_hw_queue+0x7e/0x100 block/blk-mq.c:2019
 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:2318
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x00000001000044b4 -> 0x0000000100004df8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 42 Comm: kworker/1:1H Not tainted 6.0.0-rc2-syzkaller-00054-gc40e8341e3b3-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Workqueue: kblockd blk_mq_run_work_fn
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