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BUG: KCSAN: data-race in strncpy / strscpy

write to 0xffff888107e2a730 of 8 bytes by task 28643 on cpu 1:
 strscpy+0xa9/0x170 lib/string.c:165
 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
 ext4_multi_mount_protect+0x4e0/0x5c0 fs/ext4/mmp.c:374
 __ext4_fill_super fs/ext4/super.c:5272 [inline]
 ext4_fill_super+0x3049/0x44e0 fs/ext4/super.c:5644
 get_tree_bdev+0x2b1/0x3a0 fs/super.c:1282
 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5675
 vfs_get_tree+0x51/0x190 fs/super.c:1489
 do_new_mount+0x200/0x650 fs/namespace.c:3145
 path_mount+0x493/0xb00 fs/namespace.c:3475
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3697 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3674
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3674
 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 0xffff888107e2a737 of 1 bytes by task 28648 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
 __traceiter_sched_switch+0x3a/0x50 include/trace/events/sched.h:222
 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 -> 0x6f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28648 Comm: kmmpd-loop3 Tainted: G        W          6.2.0-rc8-syzkaller-00021-ge1c04510f521-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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