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BUG: KCSAN: data-race in __kernfs_remove / cleanup_glue_dir

read-write to 0xffff8881016ff3c0 of 8 bytes by task 5411 on cpu 0:
 kernfs_unlink_sibling fs/kernfs/dir.c:415 [inline]
 __kernfs_remove+0x2ff/0x480 fs/kernfs/dir.c:1471
 kernfs_remove+0x4e/0x70 fs/kernfs/dir.c:1507
 sysfs_remove_dir+0x7e/0xa0 fs/sysfs/dir.c:101
 __kobject_del+0x8c/0x190 lib/kobject.c:601
 kobject_del+0x2e/0x50 lib/kobject.c:624
 device_add+0x5e5/0x8b0 drivers/base/core.c:3674
 device_create_groups_vargs drivers/base/core.c:4312 [inline]
 device_create+0x181/0x1d0 drivers/base/core.c:4351
 bdi_register_va+0x70/0x420 mm/backing-dev.c:1005
 super_setup_bdi_name+0x97/0x140 fs/super.c:1830
 super_setup_bdi+0x47/0x50 fs/super.c:1852
 v9fs_fill_super fs/9p/vfs_super.c:75 [inline]
 v9fs_mount+0x270/0x630 fs/9p/vfs_super.c:134
 legacy_get_tree+0x74/0xd0 fs/fs_context.c:662
 vfs_get_tree+0x51/0x1b0 fs/super.c:1771
 do_new_mount+0x203/0x660 fs/namespace.c:3337
 path_mount+0x496/0xb30 fs/namespace.c:3664
 do_mount fs/namespace.c:3677 [inline]
 __do_sys_mount fs/namespace.c:3886 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3863
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3863
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff8881016ff3c0 of 8 bytes by task 5429 on cpu 1:
 kobject_has_children drivers/base/core.c:3283 [inline]
 cleanup_glue_dir+0xe5/0x160 drivers/base/core.c:3349
 device_del+0x73a/0x7a0 drivers/base/core.c:3835
 device_unregister+0x15/0x30 drivers/base/core.c:3855
 bdi_unregister+0x307/0x390 mm/backing-dev.c:1081
 generic_shutdown_super+0x1a1/0x210 fs/super.c:730
 kill_anon_super+0x2b/0x130 fs/super.c:1295
 v9fs_kill_super+0x2f/0x60 fs/9p/vfs_super.c:220
 deactivate_locked_super+0x7a/0x1c0 fs/super.c:484
 v9fs_mount+0x4b5/0x630 fs/9p/vfs_super.c:204
 legacy_get_tree+0x74/0xd0 fs/fs_context.c:662
 vfs_get_tree+0x51/0x1b0 fs/super.c:1771
 do_new_mount+0x203/0x660 fs/namespace.c:3337
 path_mount+0x496/0xb30 fs/namespace.c:3664
 do_mount fs/namespace.c:3677 [inline]
 __do_sys_mount fs/namespace.c:3886 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3863
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3863
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000000000000a -> 0x0000000000000009

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5429 Comm: syz-executor.3 Not tainted 6.7.0-rc5-syzkaller-00042-g88035e5694a8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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