=====================================================
BUG: KMSAN: uninit-value in string_nocheck lib/vsprintf.c:638 [inline]
BUG: KMSAN: uninit-value in string+0x4ec/0x6f0 lib/vsprintf.c:720
 string_nocheck lib/vsprintf.c:638 [inline]
 string+0x4ec/0x6f0 lib/vsprintf.c:720
 vsnprintf+0x2222/0x3650 lib/vsprintf.c:2795
 seq_vprintf fs/seq_file.c:391 [inline]
 seq_printf+0x314/0x4f0 fs/seq_file.c:406
 if6_seq_show+0x233/0x2b0 net/ipv6/addrconf.c:4365
 seq_read_iter+0xaac/0x2150 fs/seq_file.c:230
 seq_read+0x7a6/0x990 fs/seq_file.c:162
 pde_read fs/proc/inode.c:311 [inline]
 proc_reg_read+0x39d/0x560 fs/proc/inode.c:323
 vfs_read+0x6c8/0x1980 fs/read_write.c:479
 ksys_pread64 fs/read_write.c:671 [inline]
 __do_sys_pread64 fs/read_write.c:681 [inline]
 __se_sys_pread64 fs/read_write.c:678 [inline]
 __x64_sys_pread64+0x35a/0x430 fs/read_write.c:678
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable counter created at:
 try_charge_memcg+0xef/0x24a0
 try_charge mm/memcontrol.c:2724 [inline]
 charge_memcg+0x163/0x990 mm/memcontrol.c:6687

CPU: 1 PID: 30329 Comm: syz-executor.5 Not tainted 5.17.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================