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BUG: KCSAN: data-race in strscpy / strscpy

write to 0xffff8881521feb08 of 8 bytes by task 1786 on cpu 0:
 strscpy+0xa8/0x170 lib/string.c:218
 strscpy_pad+0x23/0x80 lib/string_helpers.c:835
 __set_task_comm+0x3b/0x110 fs/exec.c:1233
 set_task_comm include/linux/sched.h:1984 [inline]
 __kthread_create_on_node+0x2aa/0x320 kernel/kthread.c:474
 kthread_create_on_node+0x86/0xb0 kernel/kthread.c:512
 init_rescuer+0x10e/0x190 kernel/workqueue.c:4272
 alloc_workqueue+0x7c3/0xa70 kernel/workqueue.c:4347
 wg_newlink+0x260/0x530 drivers/net/wireguard/device.c:347
 rtnl_newlink_create net/core/rtnetlink.c:3364 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3581 [inline]
 rtnl_newlink+0xf46/0x16a0 net/core/rtnetlink.c:3594
 rtnetlink_rcv_msg+0x811/0x8d0 net/core/rtnetlink.c:6091
 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2540
 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6109
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x58a/0x660 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x666/0x760 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x38f/0x500 net/socket.c:2482
 ___sys_sendmsg net/socket.c:2536 [inline]
 __sys_sendmsg+0x19a/0x230 net/socket.c:2565
 __do_sys_sendmsg net/socket.c:2574 [inline]
 __se_sys_sendmsg net/socket.c:2572 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2572
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881521feb0e of 1 bytes by task 1798 on cpu 1:
 strscpy+0xdf/0x170 lib/string.c:227
 ____bpf_get_current_comm kernel/bpf/helpers.c:258 [inline]
 bpf_get_current_comm+0x42/0x70 kernel/bpf/helpers.c:250
 ___bpf_prog_run+0x278/0x2da0 kernel/bpf/core.c:1818
 __bpf_prog_run32+0x70/0xa0 kernel/bpf/core.c:2041
 bpf_dispatcher_nop_func include/linux/bpf.h:964 [inline]
 __bpf_prog_run include/linux/filter.h:600 [inline]
 bpf_prog_run include/linux/filter.h:607 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2254 [inline]
 bpf_trace_run4+0x98/0x150 kernel/trace/bpf_trace.c:2295
 __traceiter_sched_switch+0x45/0x60 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x6c1/0x6e0 kernel/sched/core.c:6500
 schedule+0x51/0x80 kernel/sched/core.c:6579
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6638
 kthread+0x129/0x1e0 kernel/kthread.c:369
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

value changed: 0x64 -> 0x70

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1798 Comm: wg-crypt-wiregu Not tainted 6.1.0-rc2-syzkaller-00070-g4dc12f37a8e9-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
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