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BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read to 0xffff88812bf27e00 of 8 bytes by task 16220 on cpu 0:
 has_bh_in_lru+0x44/0x90 fs/buffer.c:1387
 on_each_cpu_cond_mask+0xa3/0x190 kernel/smp.c:695
 on_each_cpu_cond+0x44/0x60 kernel/smp.c:721
 invalidate_bh_lrus+0x32/0x40 fs/buffer.c:1396
 kill_bdev+0x7f/0xb0 fs/block_dev.c:85
 __blkdev_put+0x138/0x420 fs/block_dev.c:1861
 blkdev_put+0x89/0x2f0 fs/block_dev.c:1929
 kill_block_super+0x90/0xb0 fs/super.c:1445
 deactivate_locked_super+0x64/0xb0 fs/super.c:335
 mount_bdev+0x2bd/0x2d0 fs/super.c:1417
 msdos_mount+0x3e/0x60 fs/fat/namei_msdos.c:660
 legacy_get_tree+0x7e/0xf0 fs/fs_context.c:647
 vfs_get_tree+0x56/0x1a0 fs/super.c:1545
 do_new_mount fs/namespace.c:2823 [inline]
 do_mount+0x1071/0x15a0 fs/namespace.c:3143

write to 0xffff88812bf27e00 of 8 bytes by task 16222 on cpu 1:
 bh_lru_install fs/buffer.c:1239 [inline]
 __find_get_block fs/buffer.c:1298 [inline]
 __find_get_block+0x62b/0x760 fs/buffer.c:1290
 sb_find_get_block include/linux/buffer_head.h:338 [inline]
 recently_deleted fs/ext4/ialloc.c:682 [inline]
 find_inode_bit.isra.0+0x161/0x300 fs/ext4/ialloc.c:722
 __ext4_new_inode+0xd4b/0x3070 fs/ext4/ialloc.c:914
 ext4_symlink+0x30e/0x970 fs/ext4/namei.c:3262
 vfs_symlink fs/namei.c:4119 [inline]
 vfs_symlink+0x218/0x310 fs/namei.c:4105
 do_symlinkat+0x1a5/0x1e0 fs/namei.c:4146
 __do_sys_symlink fs/namei.c:4165 [inline]
 __se_sys_symlink fs/namei.c:4163 [inline]
 __x64_sys_symlink+0x3f/0x50 fs/namei.c:4163
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16222 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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