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BUG: KCSAN: data-race in __ext4_unlink / __ext4_update_other_inode_time

write to 0xffff8880092c77e0 of 8 bytes by task 8479 on cpu 0:
 __ext4_unlink+0x4c3/0x6a0 fs/ext4/namei.c:3239
 ext4_unlink+0x1e2/0x3e0 fs/ext4/namei.c:3274
 vfs_unlink+0x232/0x3b0 fs/namei.c:3833
 do_unlinkat+0x28a/0x4d0 fs/namei.c:3897
 __do_sys_unlink fs/namei.c:3943 [inline]
 __se_sys_unlink fs/namei.c:3941 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3941
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880092c77e0 of 8 bytes by task 15154 on cpu 1:
 ext4_encode_extra_time fs/ext4/ext4.h:881 [inline]
 __ext4_update_other_inode_time+0x14f/0x550 fs/ext4/inode.c:4970
 ext4_update_other_inodes_time fs/ext4/inode.c:5002 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5131 [inline]
 ext4_mark_iloc_dirty+0x1286/0x1650 fs/ext4/inode.c:5712
 __ext4_mark_inode_dirty+0x450/0x610 fs/ext4/inode.c:5906
 ext4_ext_tree_init+0x7e/0x90 fs/ext4/extents.c:828
 __ext4_new_inode+0x2a8e/0x3060 fs/ext4/ialloc.c:1326
 ext4_symlink+0x2bc/0x770 fs/ext4/namei.c:3336
 vfs_symlink+0x216/0x2d0 fs/namei.c:3960
 do_symlinkat+0xee/0x280 fs/namei.c:3987
 __do_sys_symlink fs/namei.c:4006 [inline]
 __se_sys_symlink fs/namei.c:4004 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4004
 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: 15154 Comm: syz-executor.5 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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