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BUG: KCSAN: data-race in blk_mq_free_request / blk_mq_free_request

read-write to 0xffffe8ffffd27bc8 of 8 bytes by interrupt on cpu 1:
 blk_mq_free_request+0x172/0x330 block/blk-mq.c:522
 __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

read-write to 0xffffe8ffffd27bc8 of 8 bytes by interrupt on cpu 0:
 blk_mq_free_request+0x172/0x330 block/blk-mq.c:522
 __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: 0 PID: 10 Comm: ksoftirqd/0 Not tainted 5.11.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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