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BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lrus_cpu

write to 0xffff888237d28438 of 8 bytes by task 21474 on cpu 1:
 __invalidate_bh_lrus fs/buffer.c:1392 [inline]
 invalidate_bh_lrus_cpu+0xad/0xe0 fs/buffer.c:1437
 lru_add_and_bh_lrus_drain mm/swap.c:722 [inline]
 lru_add_drain_per_cpu+0x4e/0x70 mm/swap.c:741
 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 0xffff888237d28438 of 8 bytes by task 6696 on cpu 0:
 has_bh_in_lru+0x31/0x1c0 fs/buffer.c:1414
 smp_call_function_many_cond+0x2a9/0x6d0 kernel/smp.c:917
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x26/0x30 fs/buffer.c:1423
 invalidate_bdev+0x51/0x80 block/bdev.c:86
 invalidate_disk+0x25/0xb0 block/genhd.c:676
 __loop_clr_fd+0x3f5/0x640 drivers/block/loop.c:1147
 loop_clr_fd drivers/block/loop.c:1230 [inline]
 lo_ioctl+0xa12/0x11b0 drivers/block/loop.c:1556
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:588
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0xffff88810636b000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6696 Comm: syz-executor.3 Not tainted 5.18.0-rc2-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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