=====================================================
BUG: KMSAN: uninit-value in check_pointer lib/vsprintf.c:705 [inline]
BUG: KMSAN: uninit-value in string+0x3cf/0x6f0 lib/vsprintf.c:717
 check_pointer lib/vsprintf.c:705 [inline]
 string+0x3cf/0x6f0 lib/vsprintf.c:717
 vsnprintf+0x2222/0x3650 lib/vsprintf.c:2805
 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:2156 [inline]
 generic_file_splice_read+0x78b/0xbc0 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x750/0x1410 fs/splice.c:870
 do_splice_direct+0x3b2/0x600 fs/splice.c:979
 do_sendfile+0xe3c/0x1f50 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x367/0x400 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable sample.i created at:
 perf_log_itrace_start kernel/events/core.c:9069 [inline]
 event_sched_in+0x132b/0x35c0 kernel/events/core.c:2557
 group_sched_in kernel/events/core.c:2595 [inline]
 merge_sched_in kernel/events/core.c:3746 [inline]
 visit_groups_merge+0x2919/0x7460 kernel/events/core.c:3696

CPU: 0 PID: 30611 Comm: syz-executor.1 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================