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BUG: KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list

write to 0xffff8881025e8d68 of 8 bytes by task 6690 on cpu 0:
 blk_mq_dispatch_rq_list+0xadb/0x1080 block/blk-mq.c:1393
 __blk_mq_sched_dispatch_requests+0x1d5/0x290 block/blk-mq-sched.c:327
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360
 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1487
 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1564
 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1617
 blk_mq_sched_insert_request+0x11d/0x250 block/blk-mq-sched.c:479
 blk_execute_rq_nowait+0xee/0x130 block/blk-exec.c:62
 sg_common_write+0x8df/0x1480 drivers/scsi/sg.c:835
 sg_new_write+0xb32/0xcc0 drivers/scsi/sg.c:773
 sg_ioctl_common drivers/scsi/sg.c:938 [inline]
 sg_ioctl+0xf08/0x18e0 drivers/scsi/sg.c:1164
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881025e8d68 of 8 bytes by task 6689 on cpu 1:
 blk_mq_dispatch_rq_list+0xac8/0x1080 block/blk-mq.c:1393
 __blk_mq_sched_dispatch_requests+0x1d5/0x290 block/blk-mq-sched.c:327
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360
 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1487
 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1564
 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1617
 blk_mq_sched_insert_request+0x11d/0x250 block/blk-mq-sched.c:479
 blk_execute_rq_nowait+0xee/0x130 block/blk-exec.c:62
 sg_common_write+0x8df/0x1480 drivers/scsi/sg.c:835
 sg_new_write+0xb32/0xcc0 drivers/scsi/sg.c:773
 sg_ioctl_common drivers/scsi/sg.c:938 [inline]
 sg_ioctl+0xf08/0x18e0 drivers/scsi/sg.c:1164
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000000000000093b -> 0x000000000000093c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 6689 Comm: syz-executor.3 Not tainted 5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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