Not allocated shadow for addr ffff880108654000 (page ffffea0006325f80)
Attempted to access 4096 bytes
------------[ cut here ]------------
kernel BUG at mm/kmsan/kmsan.c:1378!
invalid opcode: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 11038 Comm: syz-executor0 Not tainted 4.17.0+ #6
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 mm/kmsan/kmsan.c:1377
RSP: 0018:ffff88010cdffaf0 EFLAGS: 00010082
RAX: 000000000000001e RBX: 0000000000000420 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000001221 RDI: 0000000000001222
RBP: ffff88010cdffb08 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865757b0 R12: ffff880108654000
R13: 000000000000b000 R14: 0000000000000001 R15: 0000000000001000
FS:  00007f54a859c700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000606df0 CR3: 000000010c23a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kmsan_internal_memset_shadow mm/kmsan/kmsan.c:172 [inline]
 kmsan_internal_unpoison_shadow+0x5c/0xe0 mm/kmsan/kmsan.c:209
 kmsan_unpoison_shadow+0x66/0xb0 mm/kmsan/kmsan.c:223
 get_user_pages_fast+0x493/0x770 mm/gup.c:1831
 rds_info_getsockopt+0x336/0xbb0 net/rds/info.c:196
 rds_getsockopt+0x362/0x5e0 net/rds/af_rds.c:398
 __sys_getsockopt+0x48c/0x550 net/socket.c:1940
 __do_sys_getsockopt net/socket.c:1951 [inline]
 __se_sys_getsockopt net/socket.c:1948 [inline]
 __x64_sys_getsockopt+0x15d/0x1c0 net/socket.c:1948
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455b29
RSP: 002b:00007f54a859bc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007f54a859c6d4 RCX: 0000000000455b29
RDX: 0000000000002710 RSI: 0000200100000114 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000020000280 R09: 0000000000000000
R10: 00000000200002c0 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004bbefd R14: 00000000004c8e30 R15: 0000000000000000
Code: 75 29 48 c7 c7 59 38 97 8a 31 c0 e8 fd 4c 80 ff 80 3c 25 f8 93 53 8b 00 75 11 48 c7 c7 89 38 97 8a 31 c0 4c 89 fe e8 e2 4c 80 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 
RIP: kmsan_get_shadow_address+0x1ce/0x1f0 mm/kmsan/kmsan.c:1377 RSP: ffff88010cdffaf0
---[ end trace dc32ebb0ac687ff3 ]---