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BUG: KCSAN: data-race in strncpy / strscpy

write to 0xffff8881369cd738 of 8 bytes by task 32730 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
 init_rescuer+0x10a/0x190 kernel/workqueue.c:4387
 alloc_workqueue+0x8d5/0xa80 kernel/workqueue.c:4462
 nci_register_device+0x229/0x570 net/nfc/nci/core.c:1233
 virtual_ncidev_open+0xdc/0x140 drivers/nfc/virtual_ncidev.c:148
 misc_open+0x1fd/0x230 drivers/char/misc.c:165
 chrdev_open+0x349/0x3c0 fs/char_dev.c:414
 do_dentry_open+0x5b3/0x930 fs/open.c:920
 vfs_open+0x47/0x50 fs/open.c:1051
 do_open fs/namei.c:3560 [inline]
 path_openat+0x17e6/0x1d00 fs/namei.c:3715
 do_filp_open+0xf6/0x200 fs/namei.c:3742
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1375
 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 0xffff8881369cd738 of 1 bytes by task 32732 on cpu 1:
 strncpy+0xb4/0x150 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
 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 -> 0x5f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32732 Comm: nfc2_nci_rx_wq Not tainted 6.3.0-rc6-syzkaller-00168-g95abc817ab3a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
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