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BUG: KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new

write to 0xffff88808c891200 of 8 bytes by task 12782 on cpu 0:
 d_instantiate_new+0x99/0xe0 fs/dcache.c:1996
 ext4_add_nondir+0x172/0x1a0 fs/ext4/namei.c:2592
 ext4_symlink+0x5be/0x7e0 fs/ext4/namei.c:3384
 vfs_symlink+0x218/0x2d0 fs/namei.c:3959
 do_symlinkat+0xee/0x280 fs/namei.c:3986
 __do_sys_symlink fs/namei.c:4005 [inline]
 __se_sys_symlink fs/namei.c:4003 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4003
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88808c891200 of 8 bytes by task 16133 on cpu 1:
 __ext4_update_other_inode_time+0x45/0x570 fs/ext4/inode.c:4893
 ext4_update_other_inodes_time fs/ext4/inode.c:4940 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5068 [inline]
 ext4_mark_iloc_dirty+0x1296/0x1660 fs/ext4/inode.c:5624
 __ext4_mark_inode_dirty+0x448/0x630 fs/ext4/inode.c:5818
 __ext4_new_inode+0x2a29/0x2fc0 fs/ext4/ialloc.c:1193
 ext4_mkdir+0x299/0xc90 fs/ext4/namei.c:2800
 vfs_mkdir+0x288/0x350 fs/namei.c:3649
 do_mkdirat+0x132/0x220 fs/namei.c:3672
 __do_sys_mkdir fs/namei.c:3688 [inline]
 __se_sys_mkdir fs/namei.c:3686 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3686
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16133 Comm: syz-executor.4 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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