=====================================================
BUG: KMSAN: uninit-value in string+0x3da/0x710
 string+0x3da/0x710
 vsnprintf+0x2036/0x3460
 seq_printf+0x318/0x4f0
 show_cpuinfo+0x2fa/0x1940
 seq_read_iter+0xbb9/0x2170
 proc_reg_read_iter+0x389/0x480
 vfs_read+0x10e2/0x16d0
 ksys_read+0x28f/0x510
 __x64_sys_read+0xdb/0x120
 do_syscall_64+0x3d/0xb0
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable page created at:
 get_futex_key+0xd3/0x2b40
 futex_wait_setup+0x144/0x560

CPU: 0 PID: 3465 Comm: syz-fuzzer Not tainted 5.18.0-syzkaller-16253-g2f3064574275 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================