=====================================================
BUG: KMSAN: uninit-value in check_pointer lib/vsprintf.c:710 [inline]
BUG: KMSAN: uninit-value in string+0x3cf/0x6f0 lib/vsprintf.c:722
 check_pointer lib/vsprintf.c:710 [inline]
 string+0x3cf/0x6f0 lib/vsprintf.c:722
 vsnprintf+0x2222/0x3650 lib/vsprintf.c:2806
 seq_vprintf fs/seq_file.c:391 [inline]
 seq_printf+0x314/0x4f0 fs/seq_file.c:406
 show_cpuinfo+0x305/0x1860 arch/x86/kernel/cpu/proc.c:68
 seq_read_iter+0xaac/0x2150 fs/seq_file.c:230
 proc_reg_read_iter+0x385/0x480 fs/proc/inode.c:296
 call_read_iter include/linux/fs.h:2044 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 vfs_read+0xec1/0x17b0 fs/read_write.c:482
 ksys_read+0x28b/0x510 fs/read_write.c:620
 __do_sys_read fs/read_write.c:630 [inline]
 __se_sys_read fs/read_write.c:628 [inline]
 __x64_sys_read+0xdb/0x120 fs/read_write.c:628
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x51/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable page created at:
 get_futex_key+0xc5/0x2b90
 futex_wait_setup+0x140/0x560 kernel/futex/waitwake.c:602

CPU: 1 PID: 22459 Comm: syz-executor.4 Not tainted 5.18.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================