kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3083 Comm: syzkaller162535 Not tainted 4.15.0-rc1-mm1+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 00000000bd36cf8d task.stack: 00000000de516db5
RIP: 0010:compound_head include/linux/page-flags.h:147 [inline]
RIP: 0010:put_page include/linux/mm.h:850 [inline]
RIP: 0010:af_alg_free_areq_sgls+0x5d1/0xab0 crypto/af_alg.c:678
RSP: 0018:ffff8801cb0677d0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff823a3a4a
RDX: 0000000000000000 RSI: 1ffff100397ef29b RDI: 0000000000000000
RBP: ffff8801cb0679c8 R08: 1ffff1003960ce7e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8801cbf794c0 R15: ffffed003960cf2c
FS:  0000000000ad7880(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 00000001ce0bc000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 af_alg_free_resources+0x36/0x80 crypto/af_alg.c:1030
 _skcipher_recvmsg crypto/algif_skcipher.c:152 [inline]
 skcipher_recvmsg+0x8e5/0xf20 crypto/algif_skcipher.c:165
 sock_recvmsg_nosec net/socket.c:805 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:812
 ___sys_recvmsg+0x29b/0x630 net/socket.c:2207
 __sys_recvmsg+0xe2/0x210 net/socket.c:2252
 SYSC_recvmsg net/socket.c:2264 [inline]
 SyS_recvmsg+0x2d/0x50 net/socket.c:2259
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x440589
RSP: 002b:00007ffdc7246618 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000440589
RDX: 0000000000000000 RSI: 0000000020008000 RDI: 0000000000000004
RBP: 0000000000000005 R08: 0000000000000001 R09: 0000000000000032
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401eb0
R13: 0000000000401f40 R14: 0000000000000000 R15: 0000000000000000
Code: 00 00 48 8d 45 98 48 bb 00 00 00 00 00 fc ff df 48 89 85 48 fe ff ff 48 c1 e8 03 4c 8d 3c 18 e8 66 01 36 ff 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 0f 85 4b 03 00 00 49 8b 04 24 48 83 e0 fc 48 89 85 
RIP: compound_head include/linux/page-flags.h:147 [inline] RSP: ffff8801cb0677d0
RIP: put_page include/linux/mm.h:850 [inline] RSP: ffff8801cb0677d0
RIP: af_alg_free_areq_sgls+0x5d1/0xab0 crypto/af_alg.c:678 RSP: ffff8801cb0677d0
---[ end trace ad09445ac87d9e14 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..