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BUG: KCSAN: data-race in strncpy / strscpy

write to 0xffff88813fd72730 of 8 bytes by task 13644 on cpu 0:
 strscpy+0xa8/0x170 lib/string.c:165
 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
 init_rescuer+0x10e/0x190 kernel/workqueue.c:4272
 alloc_workqueue+0x7c3/0xa70 kernel/workqueue.c:4347
 nci_register_device+0x129/0x580 net/nfc/nci/core.c:1225
 virtual_ncidev_open+0xd8/0x140 drivers/nfc/virtual_ncidev.c:148
 misc_open+0x264/0x2a0 drivers/char/misc.c:165
 chrdev_open+0x362/0x3d0 fs/char_dev.c:414
 do_dentry_open+0x59a/0x910 fs/open.c:882
 vfs_open+0x43/0x50 fs/open.c:1013
 do_open fs/namei.c:3557 [inline]
 path_openat+0x16b8/0x1b60 fs/namei.c:3714
 do_filp_open+0x105/0x220 fs/namei.c:3741
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1337
 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 0xffff88813fd72731 of 1 bytes by task 13655 on cpu 1:
 strncpy+0xc7/0x160 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: 0x74 -> 0x66

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13655 Comm: nfc2_nci_cmd_wq Not tainted 6.2.0-rc1-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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