netdevsim netdevsim5 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim5 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim5 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
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BUG: KCSAN: data-race in kernfs_iop_permission / kernfs_link_sibling

read-write to 0xffff888104f35540 of 8 bytes by task 3093 on cpu 1:
 kernfs_link_sibling+0x1e7/0x230 fs/kernfs/dir.c:387
 kernfs_add_one+0x260/0x390 fs/kernfs/dir.c:770
 kernfs_create_dir_ns+0x100/0x150 fs/kernfs/dir.c:1046
 kernfs_create_dir include/linux/kernfs.h:610 [inline]
 cgroup_create kernel/cgroup/cgroup.c:5576 [inline]
 cgroup_mkdir+0x24e/0xd10 kernel/cgroup/cgroup.c:5709
 kernfs_iop_mkdir+0x12b/0x1e0 fs/kernfs/dir.c:1221
 vfs_mkdir+0x1ac/0x2b0 fs/namei.c:4117
 do_mkdirat+0xf9/0x260 fs/namei.c:4140
 __do_sys_mkdirat fs/namei.c:4155 [inline]
 __se_sys_mkdirat fs/namei.c:4153 [inline]
 __x64_sys_mkdirat+0x50/0x60 fs/namei.c:4153
 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 0xffff888104f35540 of 8 bytes by task 3114 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_openat+0x1a1/0x1d10 fs/namei.c:3789
 do_filp_open+0xf6/0x200 fs/namei.c:3820
 do_sys_openat2+0xab/0x110 fs/open.c:1407
 do_sys_open fs/open.c:1422 [inline]
 __do_sys_openat fs/open.c:1438 [inline]
 __se_sys_openat fs/open.c:1433 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1433
 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: 0x0000000000000005 -> 0x0000000000000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3114 Comm: syz-executor.5 Not tainted 6.5.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
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