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BUG: KCSAN: data-race in css_set_move_task / memcpy_and_pad

write to 0xffff888101789b18 of 8 bytes by task 18774 on cpu 0:
 __list_del include/linux/list.h:226 [inline]
 __list_del_entry include/linux/list.h:249 [inline]
 list_del_init include/linux/list.h:318 [inline]
 css_set_move_task+0x1c1/0x380 kernel/cgroup/cgroup.c:909
 do_cgroup_task_dead kernel/cgroup/cgroup.c:7097 [inline]
 cgroup_task_dead+0x6f/0x2b0 kernel/cgroup/cgroup.c:7161
 finish_task_switch+0x26e/0x340 kernel/sched/core.c:5405
 context_switch kernel/sched/core.c:5513 [inline]
 __schedule+0x799/0xd10 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x5a/0xa0 kernel/sched/core.c:7326
 do_nanosleep+0xc5/0x360 kernel/time/hrtimer.c:2399
 hrtimer_nanosleep+0xf2/0x290 kernel/time/hrtimer.c:2445
 common_nsleep+0x62/0x80 kernel/time/posix-timers.c:1360
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1406 [inline]
 __se_sys_clock_nanosleep+0x223/0x260 kernel/time/posix-timers.c:1383
 __x64_sys_clock_nanosleep+0x55/0x70 kernel/time/posix-timers.c:1383
 x64_sys_call+0x146e/0x3020 arch/x86/include/generated/asm/syscalls_64.h:231
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888101789140 of 3456 bytes by task 18808 on cpu 1:
 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/0x6a0 kernel/fork.c:925
 copy_process+0x5a0/0x2310 kernel/fork.c:2115
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2748
 __do_sys_clone kernel/fork.c:2889 [inline]
 __se_sys_clone kernel/fork.c:2873 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2873
 x64_sys_call+0x1222/0x3020 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 18808 Comm: dhcpcd-run-hook Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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