toolchain: LLVM 11.0.0
config: defconfig + kcsan.config
==================================================================
BUG: KCSAN: data-race in mutex_spin_on_owner+0xcc/0x150
  
race at unknown origin, with read to 0xffff5959537b0e34 of 4 bytes by task 1 on cpu 8:
 mutex_spin_on_owner+0xcc/0x150
 __mutex_lock+0x254/0x808
 __mutex_lock_killable_slowpath+0x14/0x20
 mutex_lock_killable+0xc8/0xcc
 pcpu_alloc+0x13c/0xd14
 __alloc_percpu_gfp+0x18/0x24
 percpu_ref_init+0x3c/0x1d4
 cgroup_apply_control_enable+0x298/0x668
 cgroup_mkdir+0x218/0x244
 kernfs_iop_mkdir+0x108/0x1a8
 vfs_mkdir+0x1b8/0x2a4
 do_mkdirat+0xd4/0x200
 __arm64_sys_mkdirat+0x58/0x70
 invoke_syscall+0x54/0x160
 el0_svc_common+0x100/0x148
 do_el0_svc+0x38/0xa8
 el0_svc+0x20/0x50
 el0t_64_sync_handler+0x68/0xac
 el0t_64_sync+0x180/0x184

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 8 PID: 1 Comm: systemd Not tainted 5.16.0-rc4-00002-g5854738642b4 #1
Hardware name: linux,dummy-virt (DT)
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