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BUG: KCSAN: data-race in strscpy / strscpy

write to 0xffff8881398f75d8 of 8 bytes by task 10306 on cpu 0:
 strscpy+0xa8/0x170 lib/string.c:210
 strscpy_pad+0x23/0x80 lib/string_helpers.c:791
 __set_task_comm+0x3b/0x110 fs/exec.c:1236
 set_task_comm include/linux/sched.h:1951 [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:4265
 alloc_workqueue+0x839/0xad0 kernel/workqueue.c:4340
 wg_newlink+0x1f1/0x4c0 drivers/net/wireguard/device.c:346
 rtnl_newlink_create net/core/rtnetlink.c:3363 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3580 [inline]
 rtnl_newlink+0xf46/0x16a0 net/core/rtnetlink.c:3593
 rtnetlink_rcv_msg+0x811/0x8c0 net/core/rtnetlink.c:6089
 netlink_rcv_skb+0x13e/0x240 net/netlink/af_netlink.c:2501
 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6107
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x58a/0x660 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x661/0x750 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:2492
 ___sys_sendmsg net/socket.c:2546 [inline]
 __sys_sendmsg+0x197/0x230 net/socket.c:2575
 __do_sys_sendmsg net/socket.c:2584 [inline]
 __se_sys_sendmsg net/socket.c:2582 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2582
 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+0x46/0xb0

read to 0xffff8881398f75da of 1 bytes by task 10307 on cpu 1:
 strscpy+0xdf/0x170 lib/string.c:219
 ____bpf_get_current_comm kernel/bpf/helpers.c:245 [inline]
 bpf_get_current_comm+0x42/0x70 kernel/bpf/helpers.c:237
 ___bpf_prog_run+0x278/0x2da0 kernel/bpf/core.c:1850
 __bpf_prog_run32+0x70/0xa0 kernel/bpf/core.c:2073
 bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2046 [inline]
 bpf_trace_run4+0x6d/0x100 kernel/trace/bpf_trace.c:2085
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x698/0x6b0 kernel/sched/core.c:6425
 schedule+0x71/0xa0 kernel/sched/core.c:6500
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6559
 kthread+0x129/0x1e0 kernel/kthread.c:369
 ret_from_fork+0x1f/0x30

value changed: 0x68 -> 0x2d

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10307 Comm: wg-crypt-wiregu Not tainted 5.19.0-rc2-syzkaller-00205-g462abc9de7a1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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