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BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

write to 0xffff88813bc28348 of 8 bytes by task 13059 on cpu 0:
 bh_lru_install fs/buffer.c:1271 [inline]
 __find_get_block+0x1ad/0x640 fs/buffer.c:1330
 __getblk_gfp+0x28/0x1f0 fs/buffer.c:1350
 sb_getblk include/linux/buffer_head.h:325 [inline]
 ext4_read_inode_bitmap+0x131/0xd70 fs/ext4/ialloc.c:145
 __ext4_new_inode+0xbdd/0x3060 fs/ext4/ialloc.c:1052
 ext4_symlink+0x2bc/0x780 fs/ext4/namei.c:3336
 vfs_symlink+0x216/0x2d0 fs/namei.c:3962
 do_symlinkat+0xee/0x280 fs/namei.c:3989
 __do_sys_symlink fs/namei.c:4008 [inline]
 __se_sys_symlink fs/namei.c:4006 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4006
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88813bc28348 of 8 bytes by task 8474 on cpu 1:
 has_bh_in_lru+0x31/0x1c0 fs/buffer.c:1430
 smp_call_function_many_cond+0x48c/0x630 kernel/smp.c:647
 on_each_cpu_cond_mask+0x52/0x100 kernel/smp.c:899
 on_each_cpu_cond+0x2f/0x40 kernel/smp.c:914
 invalidate_bh_lrus+0x1f/0x20 fs/buffer.c:1439
 kill_bdev fs/block_dev.c:85 [inline]
 __blkdev_put+0x232/0x450 fs/block_dev.c:1564
 blkdev_put+0x212/0x290 fs/block_dev.c:1624
 kill_block_super+0x7b/0x90 fs/super.c:1396
 deactivate_locked_super+0x6a/0xb0 fs/super.c:335
 deactivate_super+0x85/0x90 fs/super.c:366
 cleanup_mnt+0x277/0x2e0 fs/namespace.c:1118
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1125
 task_work_run+0x8e/0x110 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x16b/0x1a0 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8474 Comm: syz-executor.3 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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