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BUG: KMSAN: uninit-value in ip6_compressed_string+0x1a9/0x1460 lib/vsprintf.c:1173
CPU: 1 PID: 9403 Comm: syz-executor766 Not tainted 5.0.0-rc1+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
 ip6_compressed_string+0x1a9/0x1460 lib/vsprintf.c:1173
 ip6_addr_string+0x165/0x2b0 lib/vsprintf.c:1262
 pointer+0x10f2/0x1660 lib/vsprintf.c:2009
 vsnprintf+0xabf/0x30e0 lib/vsprintf.c:2400
 snprintf+0x246/0x290 lib/vsprintf.c:2529
 rpc_ntop6_noscopeid net/sunrpc/addr.c:56 [inline]
 rpc_sockaddr2uaddr+0x4ec/0x730 net/sunrpc/addr.c:281
 rpcb_getport_async+0xfbe/0x1790 net/sunrpc/rpcb_clnt.c:773
 call_bind+0x1a8/0x260 net/sunrpc/clnt.c:1803
 __rpc_execute+0x9c8/0x1670 net/sunrpc/sched.c:832
 rpc_execute+0x437/0x6d0 net/sunrpc/sched.c:900
 rpc_run_task+0x8b8/0xbb0 net/sunrpc/clnt.c:1066
 rpc_call_sync net/sunrpc/clnt.c:1095 [inline]
 rpc_ping net/sunrpc/clnt.c:2525 [inline]
 rpc_create_xprt+0x5a3/0xd50 net/sunrpc/clnt.c:480
 rpc_create+0xaa6/0xb30 net/sunrpc/clnt.c:588
 nfs_create_rpc_client+0x723/0x920 fs/nfs/client.c:517
 nfs_init_client+0xb8/0x1d0 fs/nfs/client.c:629
 nfs_get_client+0x1487/0x16a0 fs/nfs/client.c:419
 nfs_init_server fs/nfs/client.c:665 [inline]
 nfs_create_server+0xb8b/0x34c0 fs/nfs/client.c:949
 nfs_try_mount+0x4de/0x14b0 fs/nfs/super.c:1873
 nfs_fs_mount+0x3618/0x39e0 fs/nfs/super.c:2686
 mount_fs+0x254/0x740 fs/super.c:1258
 vfs_kern_mount+0x231/0x8c0 fs/namespace.c:959
 do_new_mount fs/namespace.c:2513 [inline]
 do_mount+0x1137/0x65e0 fs/namespace.c:2847
 ksys_mount+0x32e/0x3d0 fs/namespace.c:3063
 __do_sys_mount fs/namespace.c:3077 [inline]
 __se_sys_mount+0xe5/0x110 fs/namespace.c:3074
 __x64_sys_mount+0x62/0x80 fs/namespace.c:3074
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x440109
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff88e4a3d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440109
RDX: 0000000020000180 RSI: 0000000020000140 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 000000002000a000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401990
R13: 0000000000401a20 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:220 [inline]
 kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426
 kmsan_memcpy_memmove_metadata+0xcf2/0xf10 mm/kmsan/kmsan.c:304
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324
 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139
 ip6_compressed_string+0x89/0x1460 lib/vsprintf.c:1169
 ip6_addr_string+0x165/0x2b0 lib/vsprintf.c:1262
 pointer+0x10f2/0x1660 lib/vsprintf.c:2009
 vsnprintf+0xabf/0x30e0 lib/vsprintf.c:2400
 snprintf+0x246/0x290 lib/vsprintf.c:2529
 rpc_ntop6_noscopeid net/sunrpc/addr.c:56 [inline]
 rpc_sockaddr2uaddr+0x4ec/0x730 net/sunrpc/addr.c:281
 rpcb_getport_async+0xfbe/0x1790 net/sunrpc/rpcb_clnt.c:773
 call_bind+0x1a8/0x260 net/sunrpc/clnt.c:1803
 __rpc_execute+0x9c8/0x1670 net/sunrpc/sched.c:832
 rpc_execute+0x437/0x6d0 net/sunrpc/sched.c:900
 rpc_run_task+0x8b8/0xbb0 net/sunrpc/clnt.c:1066
 rpc_call_sync net/sunrpc/clnt.c:1095 [inline]
 rpc_ping net/sunrpc/clnt.c:2525 [inline]
 rpc_create_xprt+0x5a3/0xd50 net/sunrpc/clnt.c:480
 rpc_create+0xaa6/0xb30 net/sunrpc/clnt.c:588
 nfs_create_rpc_client+0x723/0x920 fs/nfs/client.c:517
 nfs_init_client+0xb8/0x1d0 fs/nfs/client.c:629
 nfs_get_client+0x1487/0x16a0 fs/nfs/client.c:419
 nfs_init_server fs/nfs/client.c:665 [inline]
 nfs_create_server+0xb8b/0x34c0 fs/nfs/client.c:949
 nfs_try_mount+0x4de/0x14b0 fs/nfs/super.c:1873
 nfs_fs_mount+0x3618/0x39e0 fs/nfs/super.c:2686
 mount_fs+0x254/0x740 fs/super.c:1258
 vfs_kern_mount+0x231/0x8c0 fs/namespace.c:959
 do_new_mount fs/namespace.c:2513 [inline]
 do_mount+0x1137/0x65e0 fs/namespace.c:2847
 ksys_mount+0x32e/0x3d0 fs/namespace.c:3063
 __do_sys_mount fs/namespace.c:3077 [inline]
 __se_sys_mount+0xe5/0x110 fs/namespace.c:3074
 __x64_sys_mount+0x62/0x80 fs/namespace.c:3074
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Local variable description: ----addr@rpcb_getport_async
Variable was created at:
 rpcb_getport_async+0xb3/0x1790 net/sunrpc/rpcb_clnt.c:673
 call_bind+0x1a8/0x260 net/sunrpc/clnt.c:1803
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