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BUG: KCSAN: data-race in strncpy / strscpy

write to 0xffff8881310cf478 of 8 bytes by task 17800 on cpu 1:
 strscpy+0x137/0x170 lib/string.c:162
 strscpy_pad+0x27/0x80 lib/string_helpers.c:835
 __set_task_comm+0x46/0x140 fs/exec.c:1232
 set_task_comm include/linux/sched.h:1984 [inline]
 __kthread_create_on_node+0x2b2/0x320 kernel/kthread.c:474
 kthread_create_on_node+0x8a/0xb0 kernel/kthread.c:512
 init_rescuer+0x10a/0x190 kernel/workqueue.c:4387
 alloc_workqueue+0x8d5/0xa80 kernel/workqueue.c:4462
 wg_newlink+0x2da/0x580 drivers/net/wireguard/device.c:347
 rtnl_newlink_create net/core/rtnetlink.c:3440 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3657 [inline]
 rtnl_newlink+0xe5a/0x15a0 net/core/rtnetlink.c:3670
 rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6174
 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2574
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6192
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0x56f/0x640 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x665/0x770 net/netlink/af_netlink.c:1942
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg net/socket.c:747 [inline]
 ____sys_sendmsg+0x375/0x4c0 net/socket.c:2501
 ___sys_sendmsg net/socket.c:2555 [inline]
 __sys_sendmsg+0x1e3/0x270 net/socket.c:2584
 __do_sys_sendmsg net/socket.c:2593 [inline]
 __se_sys_sendmsg net/socket.c:2591 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2591
 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 0xffff8881310cf478 of 1 bytes by task 17803 on cpu 0:
 strncpy+0xb4/0x150 lib/string.c:96
 set_cmdline kernel/trace/trace.c:2285 [inline]
 trace_save_cmdline+0x19d/0x1f0 kernel/trace/trace.c:2497
 tracing_record_taskinfo_sched_switch+0x8d/0x280 kernel/trace/trace.c:2637
 probe_sched_switch+0x80/0x90 kernel/trace/trace_sched_switch.c:35
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x803/0x900 kernel/sched/core.c:6619
 schedule+0x54/0x90 kernel/sched/core.c:6698
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6757
 kthread+0x12c/0x1e0 kernel/kthread.c:369
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x00 -> 0x2d

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17803 Comm: wg-crypt-wiregu Not tainted 6.3.0-rc2-syzkaller-00050-g9c1bec9c0b08 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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