kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
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Modules linked in:
CPU: 0 PID: 3783 Comm: syz-executor6 Not tainted 4.14.0+ #130
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c166c180 task.stack: ffff8801a20f0000
RIP: 0010:virt_to_head_page include/linux/mm.h:614 [inline]
RIP: 0010:virt_to_cache mm/slab.c:399 [inline]
RIP: 0010:kfree+0xa0/0x250 mm/slab.c:3802
RSP: 0018:ffff8801a20f7790 EFLAGS: 00010007
RAX: ffffea0000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 037febd000000000 RSI: 0000000000000000 RDI: dffffc0000000000
RBP: ffff8801a20f77b0 R08: ffff8801c50b3740 R09: ffff8801c1599500
R10: ffff8801a20f7958 R11: 0000000000000118 R12: 0000000000000286
R13: ffffffff8225ef3b R14: dffffc0000000000 R15: ffff8801a20f78c0
FS:  00007f0e8b031700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020e23d6a CR3: 00000001c6e68000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 blkcipher_walk_done+0x72b/0xde0 crypto/blkcipher.c:139
 encrypt+0x20e/0x540 arch/x86/crypto/salsa20_glue.c:79
 skcipher_crypt_blkcipher crypto/skcipher.c:619 [inline]
 skcipher_decrypt_blkcipher+0x213/0x310 crypto/skcipher.c:637
 crypto_skcipher_decrypt include/crypto/skcipher.h:463 [inline]
 _skcipher_recvmsg crypto/algif_skcipher.c:133 [inline]
 skcipher_recvmsg+0xb06/0xf30 crypto/algif_skcipher.c:164
 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: 0033:0x4529d9
RSP: 002b:00007f0e8b030c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 00000000004529d9
RDX: 0000000040010022 RSI: 0000000020851fc8 RDI: 0000000000000016
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4eb8
R13: 00000000ffffffff R14: 00007f0e8b0316d4 R15: 0000000000000009
Code: 0f 82 c6 01 00 00 48 ba 00 00 00 80 ff 77 00 00 48 01 c2 48 b8 00 00 00 00 00 ea ff ff 48 89 df 48 c1 ea 0c 48 c1 e2 06 48 01 c2 <48> 8b 42 20 48 8d 48 ff a8 01 48 0f 45 d1 4c 8b 6a 30 49 63 75 
RIP: virt_to_head_page include/linux/mm.h:614 [inline] RSP: ffff8801a20f7790
RIP: virt_to_cache mm/slab.c:399 [inline] RSP: ffff8801a20f7790
RIP: kfree+0xa0/0x250 mm/slab.c:3802 RSP: ffff8801a20f7790
---[ end trace 3d3fa335703e77f4 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
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Kernel Offset: disabled
Rebooting in 86400 seconds..