TITLE: WARNING: suspicious RCU usage
TYPE: WARNING
CORRUPTED: Y

[  161.498638] =============================
[  161.506098] device gre0 entered promiscuous mode
[  161.575261] WARNING: suspicious RCU usage
[  161.587306] 4.14.0-next-20171127+ #53 Not tainted
[  161.631389] BUG: unable to handle kernel NULL pointer dereference at 0000000000000074
[  161.631414] IP: kfree+0xb2/0x250
[  161.631417] PGD 1cd9be067 P4D 1cd9be067 PUD 1c646d067 PMD 0 
[  161.631433] Oops: 0000 [#1] SMP KASAN
[  161.631440] Dumping ftrace buffer:
[  161.631445]    (ftrace buffer empty)
[  161.631448] Modules linked in:
[  161.631459] CPU: 1 PID: 17319 Comm: syz-executor7 Not tainted 4.14.0-next-20171127+ #53
[  161.631463] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  161.631468] task: ffff8801c5442040 task.stack: ffff8801c7ed8000
[  161.631478] RIP: 0010:kfree+0xb2/0x250
[  161.631482] RSP: 0018:ffff8801c7edf780 EFLAGS: 00010046
[  161.631489] RAX: 0000000000000000 RBX: ffff8801c7edf948 RCX: ffffffffffffffff
[  161.631494] RDX: ffffea00071fb7c0 RSI: 0000000000000000 RDI: ffff8801c7edf948
[  161.631499] RBP: ffff8801c7edf7a0 R08: ffffed003b02866c R09: 0000000000000000
[  161.631503] R10: 0000000000000001 R11: ffffed003b02866b R12: 0000000000000286
[  161.631508] R13: 0000000000000000 R14: ffff8801c7edf948 R15: ffff8801c7edf8b0
[  161.631514] FS:  00007ff14d179700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
[  161.631519] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  161.631524] CR2: 0000000000000074 CR3: 00000001c6768000 CR4: 00000000001426e0
[  161.631529] Call Trace:
[  161.631545]  blkcipher_walk_done+0x72b/0xde0
[  161.631565]  encrypt+0x50a/0xaf0
...
[  161.631991]  SyS_recvmsg+0x2d/0x50
[  161.632001]  entry_SYSCALL_64_fastpath+0x1f/0x96
[  161.632007] RIP: 0033:0x4529d9
[  161.632011] RSP: 002b:00007ff14d178c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002f
[  161.632018] RAX: ffffffffffffffda RBX: 0000000000758190 RCX: 00000000004529d9
[  161.632022] RDX: 0000000000010000 RSI: 0000000020d63fc8 RDI: 0000000000000018
[  161.632026] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
[  161.632031] R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2728
[  161.632035] R13: 00000000ffffffff R14: 00007ff14d1796d4 R15: 0000000000000000
[  161.632057] Code: 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 74 e8 b5 5c af ff 48 89 de 4c 89 ef 4c 8b 75 08 e8 76 
[  161.632230] RIP: kfree+0xb2/0x250 RSP: ffff8801c7edf780
[  161.632233] CR2: 0000000000000074
[  161.632243] ---[ end trace e3c719a9c9d01886 ]---
