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BUG: KCSAN: data-race in __ext4_update_other_inode_time / iput

write to 0xffff8882178156c0 of 8 bytes by task 29560 on cpu 0:
 __ext4_update_other_inode_time+0xc1/0x570 fs/ext4/inode.c:4904
 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
 add_dirent_to_buf+0x465/0x5e0 fs/ext4/namei.c:2031
 ext4_add_entry+0x655/0x21a0 fs/ext4/namei.c:2243
 ext4_add_nondir+0x50/0x1a0 fs/ext4/namei.c:2579
 ext4_symlink+0x5be/0x7e0 fs/ext4/namei.c:3372
 vfs_symlink+0x218/0x2f0 fs/namei.c:3953
 do_symlinkat+0xee/0x280 fs/namei.c:3980
 __do_sys_symlink fs/namei.c:3999 [inline]
 __se_sys_symlink fs/namei.c:3997 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:3997
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8882178156c0 of 8 bytes by task 9143 on cpu 1:
 iput+0x2e/0x550 fs/inode.c:1668
 do_unlinkat+0x2c9/0x4d0 fs/namei.c:3895
 __do_sys_unlink fs/namei.c:3936 [inline]
 __se_sys_unlink fs/namei.c:3934 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3934
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9143 Comm: syz-executor.4 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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