==================================================================
BUG: KCSAN: data-race in __d_instantiate / step_into

read-write to 0xffff8881055c8600 of 4 bytes by task 6933 on cpu 0:
 __d_instantiate+0x2cd/0x3c0 fs/dcache.c:1855
 d_instantiate_new+0x5c/0xf0 fs/dcache.c:1899
 ext4_add_nondir+0x16c/0x1a0 fs/ext4/namei.c:2797
 ext4_mknod+0x210/0x2f0 fs/ext4/namei.c:2872
 vfs_mknod+0x2d4/0x310 fs/namei.c:4009
 do_mknodat+0x27b/0x420
 __do_sys_mknodat fs/namei.c:4087 [inline]
 __se_sys_mknodat fs/namei.c:4084 [inline]
 __x64_sys_mknodat+0x62/0x70 fs/namei.c:4084
 x64_sys_call+0x2309/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:260
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7