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BUG: KCSAN: data-race in strncpy / strscpy

write to 0xffff888125acd738 of 8 bytes by task 9873 on cpu 1:
 strscpy+0x138/0x170 lib/string.c:162
 strscpy_pad+0x23/0x80 lib/string_helpers.c:835
 __set_task_comm+0x3b/0x110 fs/exec.c:1231
 set_task_comm include/linux/sched.h:1978 [inline]
 __kthread_create_on_node+0x2aa/0x320 kernel/kthread.c:474
 kthread_create_on_node+0x86/0xb0 kernel/kthread.c:512
 cryptomgr_schedule_probe crypto/algboss.c:158 [inline]
 cryptomgr_notify+0x4a1/0x590 crypto/algboss.c:226
 notifier_call_chain kernel/notifier.c:87 [inline]
 blocking_notifier_call_chain+0x73/0xf0 kernel/notifier.c:382
 crypto_probing_notify crypto/api.c:305 [inline]
 crypto_alg_mod_lookup+0x57a/0xaf0 crypto/api.c:335
 crypto_find_alg+0x5e/0x70 crypto/api.c:544
 crypto_type_has_alg+0x28/0x60 crypto/algapi.c:1030
 crypto_has_ahash+0x25/0x30 crypto/ahash.c:564
 xfrm_probe_algs+0x56/0x2c0 net/xfrm/xfrm_algo.c:824
 pfkey_register+0xd0/0x410 net/key/af_key.c:1701
 pfkey_process net/key/af_key.c:2844 [inline]
 pfkey_sendmsg+0x6ba/0x890 net/key/af_key.c:3695
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x38f/0x500 net/socket.c:2476
 ___sys_sendmsg net/socket.c:2530 [inline]
 __sys_sendmsg+0x19a/0x230 net/socket.c:2559
 __do_sys_sendmsg net/socket.c:2568 [inline]
 __se_sys_sendmsg net/socket.c:2566 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2566
 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 0xffff888125acd738 of 1 bytes by task 9900 on cpu 0:
 strncpy+0xe9/0x160 lib/string.c:96
 set_cmdline kernel/trace/trace.c:2240 [inline]
 trace_save_cmdline kernel/trace/trace.c:2452 [inline]
 tracing_record_taskinfo_sched_switch+0x20f/0x610 kernel/trace/trace.c:2592
 probe_sched_switch+0x7c/0x90 kernel/trace/trace_sched_switch.c:35
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x6d4/0x6f0 kernel/sched/core.c:6552
 schedule+0x51/0x80 kernel/sched/core.c:6631
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6690
 kthread+0x129/0x1e0 kernel/kthread.c:369
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x00 -> 0x72

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9900 Comm: cryptomgr_probe Tainted: G        W          6.2.0-rc2-syzkaller-00024-g512dee0c00ad-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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