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BUG: KCSAN: data-race in strncpy / strscpy

write to 0xffff888109648738 of 8 bytes by task 7352 on cpu 0:
 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
 cryptomgr_schedule_probe crypto/algboss.c:158 [inline]
 cryptomgr_notify+0x4a4/0x590 crypto/algboss.c:226
 notifier_call_chain kernel/notifier.c:87 [inline]
 blocking_notifier_call_chain+0x70/0xe0 kernel/notifier.c:382
 crypto_probing_notify crypto/api.c:305 [inline]
 crypto_alg_mod_lookup+0x282/0x4e0 crypto/api.c:335
 crypto_find_alg+0x62/0x70 crypto/api.c:544
 crypto_grab_spawn+0x5e/0x1c0 crypto/algapi.c:724
 crypto_grab_ahash+0x45/0x50 crypto/ahash.c:520
 crypto_ccm_create_common+0xd6/0x4a0 crypto/ccm.c:466
 crypto_ccm_create+0x114/0x140 crypto/ccm.c:548
 cryptomgr_probe+0x51/0x120 crypto/algboss.c:61
 kthread+0x1a6/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff888109648738 of 1 bytes by task 7356 on cpu 1:
 strncpy+0xf6/0x150 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+0x81/0x270 kernel/trace/trace.c:2637
 probe_sched_switch+0x80/0x90 kernel/trace/trace_sched_switch.c:35
 __traceiter_sched_switch+0x3a/0x50 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x7e7/0x8e0 kernel/sched/core.c:6622
 schedule+0x51/0x80 kernel/sched/core.c:6701
 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:6760
 kthread+0x11c/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: 1 PID: 7356 Comm: cryptomgr_probe Not tainted 6.3.0-rc7-syzkaller-00089-gcb0856346a60 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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