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BUG: KCSAN: data-race in kernfs_iop_permission / kernfs_link_sibling

read-write to 0xffff888100f1db40 of 8 bytes by task 16317 on cpu 1:
 kernfs_link_sibling+0x1e7/0x230 fs/kernfs/dir.c:387
 kernfs_add_one+0x260/0x390 fs/kernfs/dir.c:768
 kernfs_create_dir_ns+0x100/0x150 fs/kernfs/dir.c:1044
 sysfs_create_dir_ns+0xd7/0x1d0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:65 [inline]
 kobject_add_internal+0x47b/0x780 lib/kobject.c:233
 kobject_add_varg lib/kobject.c:368 [inline]
 kobject_add+0xdc/0x150 lib/kobject.c:420
 device_add+0x2ff/0xab0 drivers/base/core.c:3563
 device_create_groups_vargs drivers/base/core.c:4302 [inline]
 device_create+0x181/0x1d0 drivers/base/core.c:4341
 vcs_make_sysfs+0x3e/0xb0 drivers/tty/vt/vc_screen.c:793
 vc_allocate+0x402/0x430 drivers/tty/vt/vt.c:1107
 con_install+0x36/0x2d0 drivers/tty/vt/vt.c:3333
 tty_driver_install_tty drivers/tty/tty_io.c:1303 [inline]
 tty_init_dev+0x7a/0x320 drivers/tty/tty_io.c:1415
 tty_open_by_driver drivers/tty/tty_io.c:2081 [inline]
 tty_open+0x6c6/0xb00 drivers/tty/tty_io.c:2128
 chrdev_open+0x349/0x3c0 fs/char_dev.c:414
 do_dentry_open+0x5b3/0x930 fs/open.c:920
 vfs_open+0x47/0x50 fs/open.c:1051
 do_open fs/namei.c:3636 [inline]
 path_openat+0x17e6/0x1d00 fs/namei.c:3791
 do_filp_open+0xf6/0x200 fs/namei.c:3818
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888100f1db40 of 8 bytes by task 5948 on cpu 0:
 kernfs_refresh_inode fs/kernfs/inode.c:181 [inline]
 kernfs_iop_permission+0x165/0x1b0 fs/kernfs/inode.c:289
 do_inode_permission fs/namei.c:461 [inline]
 inode_permission+0x184/0x300 fs/namei.c:528
 may_lookup fs/namei.c:1720 [inline]
 link_path_walk+0x19e/0x7e0 fs/namei.c:2267
 path_lookupat+0x72/0x2a0 fs/namei.c:2478
 filename_lookup+0x126/0x300 fs/namei.c:2508
 vfs_statx+0xa9/0x300 fs/stat.c:238
 vfs_fstatat fs/stat.c:276 [inline]
 __do_sys_newfstatat fs/stat.c:446 [inline]
 __se_sys_newfstatat+0x8a/0x2a0 fs/stat.c:440
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:440
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000000000000f -> 0x0000000000000010

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5948 Comm: udevd Not tainted 6.4.0-rc7-syzkaller-00194-g8a28a0b6f1a1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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