=====================================================
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
 proto_seq_show+0x583/0x1770 net/core/sock.c:3878
 traverse+0x345/0xd70 fs/seq_file.c:111
 seq_lseek+0x29a/0x4c0 fs/seq_file.c:323
 proc_reg_llseek+0x27a/0x4c0 fs/proc/inode.c:284
 vfs_llseek fs/read_write.c:300 [inline]
 ksys_lseek fs/read_write.c:313 [inline]
 __do_sys_lseek fs/read_write.c:324 [inline]
 __se_sys_lseek fs/read_write.c:322 [inline]
 __x64_sys_lseek+0x31e/0x480 fs/read_write.c:322
 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 page created at:
 get_futex_key+0xc4/0x1e60
 futex_wait_setup+0x140/0x560 kernel/futex/waitwake.c:602

CPU: 1 PID: 32616 Comm: syz-executor.2 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================