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BUG: KCSAN: data-race in __ext4_unlink / __ext4_update_other_inode_time

write to 0xffff88803a3c77a0 of 8 bytes by task 7688 on cpu 1:
 __ext4_unlink+0x4e3/0x6c0 fs/ext4/namei.c:3250
 ext4_unlink+0x1f1/0x3f0 fs/ext4/namei.c:3285
 vfs_unlink+0x24a/0x3e0 fs/namei.c:4029
 do_unlinkat+0x29f/0x4f0 fs/namei.c:4096
 __do_sys_unlink fs/namei.c:4143 [inline]
 __se_sys_unlink fs/namei.c:4141 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4141
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88803a3c77a0 of 8 bytes by task 8422 on cpu 0:
 ext4_encode_extra_time fs/ext4/ext4.h:891 [inline]
 __ext4_update_other_inode_time+0x14f/0x550 fs/ext4/inode.c:4976
 ext4_update_other_inodes_time fs/ext4/inode.c:5008 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5137 [inline]
 ext4_mark_iloc_dirty+0x11b6/0x16f0 fs/ext4/inode.c:5724
 __ext4_mark_inode_dirty+0x4db/0x5e0 fs/ext4/inode.c:5918
 __ext4_unlink+0x501/0x6c0 fs/ext4/namei.c:3251
 ext4_unlink+0x1f1/0x3f0 fs/ext4/namei.c:3285
 vfs_unlink+0x24a/0x3e0 fs/namei.c:4029
 do_unlinkat+0x29f/0x4f0 fs/namei.c:4096
 __do_sys_unlink fs/namei.c:4143 [inline]
 __se_sys_unlink fs/namei.c:4141 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4141
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8422 Comm: syz-executor.2 Tainted: G        W         5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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