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BUG: KCSAN: data-race in __blkdev_put / __blkdev_put

write to 0xffff88812b803044 of 4 bytes by task 13462 on cpu 0:
 __blkdev_put+0x10c/0x4a0 fs/block_dev.c:1891
 blkdev_put+0x1e6/0x210 fs/block_dev.c:1962
 blkdev_close+0x47/0x50 fs/block_dev.c:1969
 __fput+0x1df/0x460 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:216 [inline]
 __prepare_exit_to_usermode+0x1c8/0x230 arch/x86/entry/common.c:246
 __syscall_return_slowpath arch/x86/entry/common.c:329 [inline]
 do_syscall_64+0xb9/0x120 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812b803044 of 4 bytes by task 16316 on cpu 1:
 __blkdev_put+0x5c/0x4a0 fs/block_dev.c:1884
 blkdev_put+0x1e6/0x210 fs/block_dev.c:1962
 blkdev_close+0x47/0x50 fs/block_dev.c:1969
 __fput+0x1df/0x460 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:216 [inline]
 __prepare_exit_to_usermode+0x1c8/0x230 arch/x86/entry/common.c:246
 __syscall_return_slowpath arch/x86/entry/common.c:329 [inline]
 do_syscall_64+0xb9/0x120 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16316 Comm: systemd-udevd Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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