Not allocated shadow for addr ffff8801ad79d000 (page ffffea000a10dae0)
Attempted to access 4096 bytes
------------[ cut here ]------------
kernel BUG at mm/kmsan/kmsan.c:1326!
invalid opcode: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4948 Comm: syzkaller974951 Not tainted 4.16.0+ #81
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:1325
RSP: 0018:ffff8801a660f540 EFLAGS: 00010086
RAX: 000000000000001e RBX: 00000000000006a0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffff8801a660f558 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ad79d000
R13: 0000000000001000 R14: 0000000000000001 R15: 0000000000001000
FS:  0000000000e2d880(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020895fe0 CR3: 00000001c3706000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kmsan_internal_memset_shadow mm/kmsan/kmsan.c:171 [inline]
 kmsan_internal_unpoison_shadow+0x5c/0xe0 mm/kmsan/kmsan.c:208
 kmsan_unpoison_shadow+0x66/0xb0 mm/kmsan/kmsan.c:222
 get_user_pages_fast+0x47b/0x760 mm/gup.c:1823
 iov_iter_get_pages+0x465/0x1810 lib/iov_iter.c:1074
 af_alg_make_sg+0xdf/0x6d0 crypto/af_alg.c:404
 af_alg_get_rsgl+0x746/0xe10 crypto/af_alg.c:1158
 _skcipher_recvmsg crypto/algif_skcipher.c:81 [inline]
 skcipher_recvmsg+0x546/0x1940 crypto/algif_skcipher.c:164
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg+0x1d0/0x230 net/socket.c:810
 ___sys_recvmsg+0x3fb/0x810 net/socket.c:2205
 __sys_recvmsg net/socket.c:2250 [inline]
 SYSC_recvmsg+0x298/0x3c0 net/socket.c:2262
 SyS_recvmsg+0x54/0x80 net/socket.c:2257
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x4414c9
RSP: 002b:00007ffe8a4aaf68 EFLAGS: 00000217 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004414c9
RDX: 0000000000000000 RSI: 0000000020dac000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 000000008a4ab0e8 R09: 000000008a4ab0e8
R10: 000000008a4ab0e8 R11: 0000000000000217 R12: 000000000000b05c
R13: 00000000006cd448 R14: 0000000000000000 R15: 0000000000000000
Code: 75 29 48 c7 c7 71 2a a1 87 31 c0 e8 0d 11 86 ff 80 3c 25 a8 a4 2d 88 00 75 11 48 c7 c7 a1 2a a1 87 31 c0 4c 89 fe e8 f2 10 86 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:1325 RSP: ffff8801a660f540
---[ end trace db452e588a845a17 ]---