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BUG: KCSAN: data-race in __ext4_unlink / __ext4_update_other_inode_time

write to 0xffff888012df4818 of 8 bytes by task 8458 on cpu 1:
 __ext4_unlink+0x4b3/0x6a0 fs/ext4/namei.c:3233
 ext4_unlink+0x1f1/0x3f0 fs/ext4/namei.c:3268
 vfs_unlink+0x232/0x3b0 fs/namei.c:3835
 do_unlinkat+0x28a/0x4d0 fs/namei.c:3899
 __do_sys_unlink fs/namei.c:3945 [inline]
 __se_sys_unlink fs/namei.c:3943 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3943
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888012df4818 of 8 bytes by task 7411 on cpu 0:
 ext4_encode_extra_time fs/ext4/ext4.h:890 [inline]
 __ext4_update_other_inode_time+0x132/0x550 fs/ext4/inode.c:4979
 ext4_update_other_inodes_time fs/ext4/inode.c:5011 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5140 [inline]
 ext4_mark_iloc_dirty+0x1286/0x1650 fs/ext4/inode.c:5721
 __ext4_mark_inode_dirty+0x4cd/0x5d0 fs/ext4/inode.c:5915
 ext4_ext_tree_init+0x7e/0x90 fs/ext4/extents.c:828
 __ext4_new_inode+0x2a90/0x3060 fs/ext4/ialloc.c:1326
 ext4_tmpfile+0x16b/0x2e0 fs/ext4/namei.c:2679
 vfs_tmpfile+0xd5/0x1a0 fs/namei.c:3286
 ovl_do_tmpfile fs/overlayfs/overlayfs.h:236 [inline]
 ovl_make_workdir fs/overlayfs/super.c:1363 [inline]
 ovl_get_workdir fs/overlayfs/super.c:1474 [inline]
 ovl_fill_super+0x2bc8/0x3ab0 fs/overlayfs/super.c:2001
 mount_nodev+0x4f/0xc0 fs/super.c:1412
 ovl_mount+0x25/0x30 fs/overlayfs/super.c:2093
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x190 fs/super.c:1496
 do_new_mount fs/namespace.c:2878 [inline]
 path_mount+0x119d/0x1c10 fs/namespace.c:3208
 do_mount fs/namespace.c:3221 [inline]
 __do_sys_mount fs/namespace.c:3429 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3406
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3406
 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: 0 PID: 7411 Comm: syz-executor.4 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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