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BUG: KCSAN: data-race in __ext4_unlink / __ext4_update_other_inode_time

write to 0xffff8881017c4c60 of 8 bytes by task 1765 on cpu 0:
 __ext4_unlink+0x310/0x4c0 fs/ext4/namei.c:3368
 ext4_unlink+0x1eb/0x340 fs/ext4/namei.c:3403
 vfs_unlink+0x24a/0x400 fs/namei.c:4035
 do_unlinkat+0x238/0x4f0 fs/namei.c:4102
 __do_sys_unlink fs/namei.c:4149 [inline]
 __se_sys_unlink fs/namei.c:4147 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4147
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881017c4c60 of 8 bytes by task 6738 on cpu 1:
 ext4_encode_extra_time fs/ext4/ext4.h:896 [inline]
 __ext4_update_other_inode_time+0x18b/0x5c0 fs/ext4/inode.c:4974
 ext4_update_other_inodes_time fs/ext4/inode.c:5006 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5135 [inline]
 ext4_mark_iloc_dirty+0x12b6/0x1750 fs/ext4/inode.c:5724
 __ext4_mark_inode_dirty+0x4db/0x5b0 fs/ext4/inode.c:5918
 __ext4_ext_dirty fs/ext4/extents.c:169 [inline]
 ext4_ext_insert_extent+0x1d28/0x2c70 fs/ext4/extents.c:2134
 ext4_ext_map_blocks+0x167d/0x1f00 fs/ext4/extents.c:4266
 ext4_map_blocks+0x70d/0xef0 fs/ext4/inode.c:638
 ext4_getblk+0xb1/0x3d0 fs/ext4/inode.c:848
 ext4_bread+0x28/0x100 fs/ext4/inode.c:900
 ext4_append+0xd1/0x1c0 fs/ext4/namei.c:67
 ext4_init_new_dir+0x177/0x500 fs/ext4/namei.c:2885
 ext4_mkdir+0x329/0x760 fs/ext4/namei.c:2931
 vfs_mkdir+0x2a4/0x370 fs/namei.c:3823
 do_mkdirat+0x11d/0x200 fs/namei.c:3848
 __do_sys_mkdir fs/namei.c:3866 [inline]
 __se_sys_mkdir fs/namei.c:3864 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3864
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000012d28358 -> 0x000000001498fb17

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 6738 Comm: syz-executor.4 Tainted: G        W         5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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