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BUG: KCSAN: data-race in css_set_move_task / memcpy_and_pad

write to 0xffff888103a84ee0 of 8 bytes by task 71 on cpu 1:
 __list_del include/linux/list.h:241 [inline]
 __list_del_entry include/linux/list.h:264 [inline]
 list_del_init include/linux/list.h:333 [inline]
 css_set_move_task+0x1c1/0x380 kernel/cgroup/cgroup.c:911
 do_cgroup_task_dead kernel/cgroup/cgroup.c:7173 [inline]
 cgroup_task_dead+0x6f/0x2b0 kernel/cgroup/cgroup.c:7237
 finish_task_switch+0x270/0x340 kernel/sched/core.c:5428
 context_switch kernel/sched/core.c:5536 [inline]
 __schedule+0x79e/0xd20 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x5b/0xa0 kernel/sched/core.c:7376
 do_wait+0x10e/0x230 kernel/exit.c:1738
 kernel_wait+0x72/0x100 kernel/exit.c:1909
 call_usermodehelper_exec_sync kernel/umh.c:134 [inline]
 call_usermodehelper_exec_work+0x9c/0x160 kernel/umh.c:161
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x56a/0xa50 kernel/workqueue.c:3479
 worker_thread+0x569/0x750 kernel/workqueue.c:3560
 kthread+0x223/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888103a84500 of 3456 bytes by task 7928 on cpu 0:
 memcpy_and_pad+0x48/0x80 lib/string_helpers.c:1008
 arch_dup_task_struct+0x2c/0x40 arch/x86/kernel/process.c:108
 dup_task_struct+0x6d/0x750 kernel/fork.c:926
 copy_process+0x5a3/0x2360 kernel/fork.c:2134
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2771
 __do_sys_clone kernel/fork.c:2913 [inline]
 __se_sys_clone kernel/fork.c:2897 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2897
 x64_sys_call+0x2479/0x2550 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 7928 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
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