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BUG: KCSAN: data-race in strncpy / strscpy

write to 0xffff8881473b2730 of 8 bytes by task 17119 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:1231
 set_task_comm include/linux/sched.h:1978 [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:4272
 alloc_workqueue+0x7ab/0xa50 kernel/workqueue.c:4347
 bond_init+0x8b/0x280 drivers/net/bonding/bond_main.c:6269
 register_netdevice+0x217/0xcd0 net/core/dev.c:9967
 bond_newlink+0x3b/0x80 drivers/net/bonding/bond_netlink.c:560
 rtnl_newlink_create net/core/rtnetlink.c:3407 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3624 [inline]
 rtnl_newlink+0xe5a/0x15a0 net/core/rtnetlink.c:3637
 rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6141
 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2574
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6159
 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:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x390/0x510 net/socket.c:2479
 ___sys_sendmsg net/socket.c:2533 [inline]
 __sys_sendmsg+0x1e3/0x270 net/socket.c:2562
 __do_sys_sendmsg net/socket.c:2571 [inline]
 __se_sys_sendmsg net/socket.c:2569 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2569
 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 0xffff8881473b2737 of 1 bytes by task 17121 on cpu 0:
 strncpy+0xf6/0x150 lib/string.c:96
 set_cmdline kernel/trace/trace.c:2240 [inline]
 trace_save_cmdline+0x19d/0x1f0 kernel/trace/trace.c:2452
 tracing_record_taskinfo_sched_switch+0x8d/0x280 kernel/trace/trace.c:2592
 probe_sched_switch+0x80/0x90 kernel/trace/trace_sched_switch.c:35
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x6f1/0x7f0 kernel/sched/core.c:6603
 schedule+0x54/0x90 kernel/sched/core.c:6682
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6741
 kthread+0x12c/0x1e0 kernel/kthread.c:369
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x64 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17121 Comm: bond3 Not tainted 6.2.0-rc8-syzkaller-00083-g3ac88fa4605e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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