=====================================================
BUG: KMSAN: uninit-value in check_pointer lib/vsprintf.c:705 [inline]
BUG: KMSAN: uninit-value in string+0x3d2/0x700 lib/vsprintf.c:717
 check_pointer lib/vsprintf.c:705 [inline]
 string+0x3d2/0x700 lib/vsprintf.c:717
 vsnprintf+0x224f/0x36a0 lib/vsprintf.c:2797
 seq_vprintf fs/seq_file.c:407 [inline]
 seq_printf+0x301/0x500 fs/seq_file.c:422
 if6_seq_show+0x235/0x2b0 net/ipv6/addrconf.c:4343
 seq_read_iter+0xab2/0x2160 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
 do_iter_read+0xb28/0x14c0 fs/read_write.c:792
 vfs_readv fs/read_write.c:910 [inline]
 do_preadv+0x45e/0x6c0 fs/read_write.c:1002
 __do_sys_preadv fs/read_write.c:1052 [inline]
 __se_sys_preadv fs/read_write.c:1047 [inline]
 __x64_sys_preadv+0x120/0x170 fs/read_write.c:1047
 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@get_futex_key created at:
 get_futex_key+0xc4/0x1f50
 futex_wait_setup+0x166/0xbf0 kernel/futex.c:2899
=====================================================
Kernel panic - not syncing: panic_on_kmsan set ...
CPU: 1 PID: 13464 Comm: syz-executor.2 Tainted: G    B             5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106
 dump_stack+0x25/0x28 lib/dump_stack.c:113
 panic+0x44f/0xdeb kernel/panic.c:232
 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:168
 __msan_warning+0xa9/0xf0 mm/kmsan/instrumentation.c:199
 check_pointer lib/vsprintf.c:705 [inline]
 string+0x3d2/0x700 lib/vsprintf.c:717
 vsnprintf+0x224f/0x36a0 lib/vsprintf.c:2797
 seq_vprintf fs/seq_file.c:407 [inline]
 seq_printf+0x301/0x500 fs/seq_file.c:422
 if6_seq_show+0x235/0x2b0 net/ipv6/addrconf.c:4343
 seq_read_iter+0xab2/0x2160 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
 do_iter_read+0xb28/0x14c0 fs/read_write.c:792
 vfs_readv fs/read_write.c:910 [inline]
 do_preadv+0x45e/0x6c0 fs/read_write.c:1002
 __do_sys_preadv fs/read_write.c:1052 [inline]
 __se_sys_preadv fs/read_write.c:1047 [inline]
 __x64_sys_preadv+0x120/0x170 fs/read_write.c:1047
 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
RIP: 0033:0x7fdafa8168d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdaf7d8d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007fdafa91af60 RCX: 00007fdafa8168d9
RDX: 0000000000000001 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007fdafa870cb4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdafae4eb2f R14: 00007fdaf7d8d300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..