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BUG: KCSAN: data-race in strncpy / strscpy

write to 0xffff888144d82730 of 8 bytes by task 4214 on cpu 1:
 strscpy+0xa9/0x170
 strscpy_pad+0x27/0x80
 __set_task_comm+0x46/0x140
 __kthread_create_on_node+0x2b2/0x320
 kthread_create_on_node+0x8a/0xb0
 init_rescuer+0x10a/0x190
 alloc_workqueue+0x7ab/0xa50
 ext4_fill_super+0x374f/0x44e0
 get_tree_bdev+0x2b1/0x3a0
 ext4_get_tree+0x1c/0x20
 vfs_get_tree+0x51/0x190
 do_new_mount+0x200/0x650
 path_mount+0x493/0xb00
 __se_sys_mount+0x27f/0x2d0
 __x64_sys_mount+0x67/0x80
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888144d82736 of 1 bytes by task 4221 on cpu 0:
 strncpy+0xd4/0x150
 trace_save_cmdline+0x19d/0x1f0
 tracing_record_taskinfo_sched_switch+0x8d/0x280
 probe_sched_switch+0x80/0x90
 __schedule+0x6f1/0x7f0
 schedule+0x54/0x90
 schedule_preempt_disabled+0x13/0x20
 kthread+0x12c/0x1e0
 ret_from_fork+0x1f/0x30

value changed: 0x64 -> 0x73

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4221 Comm: ext4-rsv-conver Tainted: G        W          6.2.0-rc7-syzkaller-00018-g0983f6bf2bfc-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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