==================================================================
BUG: KCSAN: data-race in css_set_move_task / memcpy_and_pad

write to 0xffff88810224e020 of 8 bytes by task 13825 on cpu 0:
 __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:7170 [inline]
 cgroup_task_dead+0x6f/0x2b0 kernel/cgroup/cgroup.c:7234
 finish_task_switch+0x270/0x340 kernel/sched/core.c:5421
 context_switch kernel/sched/core.c:5529 [inline]
 __schedule+0x79e/0xd20 kernel/sched/core.c:7276
 __schedule_loop kernel/sched/core.c:7353 [inline]
 schedule+0x5b/0xa0 kernel/sched/core.c:7368
 synchronize_rcu_expedited+0x5f8/0x770 kernel/rcu/tree_exp.h:981
 synchronize_rcu+0x35/0x2e0 kernel/rcu/tree.c:3411
 __nf_tables_abort net/netfilter/nf_tables_api.c:11481 [inline]
 nf_tables_abort+0x3b54/0x47c0 net/netfilter/nf_tables_api.c:11500
 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:593 [inline]
 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
 nfnetlink_rcv+0x1260/0x1740 net/netfilter/nfnetlink.c:665
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x5a9/0x680 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x5be/0x6f0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0x532/0x580 net/socket.c:2713
 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2767
 __sys_sendmsg net/socket.c:2799 [inline]
 __do_sys_sendmsg net/socket.c:2804 [inline]
 __se_sys_sendmsg net/socket.c:2802 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2802
 x64_sys_call+0x22ab/0x2550 arch/x86/include/generated/asm/syscalls_64.h:47
 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

read to 0xffff88810224d640 of 3456 bytes by task 13828 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/0x750 kernel/fork.c:926
 copy_process+0x5a0/0x2340 kernel/fork.c:2133
 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2766
 __do_sys_clone kernel/fork.c:2908 [inline]
 __se_sys_clone kernel/fork.c:2892 [inline]
 __x64_sys_clone+0x143/0x180 kernel/fork.c:2892
 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: 1 UID: 0 PID: 13828 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
==================================================================