syzbot

random: sshd: uninitialized urandom read (32 bytes read, 115 bits of entropy available)
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3341 Comm: syzkaller877370 Not tainted 4.4.107-g610c835 #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cfc52f80 task.stack: ffff8801d1140000
RIP: 0010:[<ffffffff81d641d6>]  [<ffffffff81d641d6>] __list_del_entry+0x86/0x1d0 lib/list_debug.c:57
RSP: 0018:ffff8801d1147628  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8800b74f5a10
RDX: 0000000000000000 RSI: ffffffff851b2510 RDI: ffff8800b74f5a18
RBP: ffff8801d1147640 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 1ffff1003a228e94 R12: 0000000000000000
R13: ffff8800b74f59b9 R14: ffff8800b74f5a38 R15: 00000000ffffffde
FS:  00000000022e7880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020239000 CR3: 00000001d05c4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8800b74f5a38 ffff8800b74f5a10 ffffffff846eb040 ffff8801d1147658
 ffffffff81d6432d ffff8800b74f5a10 ffff8801d1147678 ffffffff832b081e
 ffff8800b7032a80 ffff8800b74f5a10 ffff8801d1147698 ffffffff832cfd73
Call Trace:
 [<ffffffff81d6432d>] list_del+0xd/0x70 lib/list_debug.c:77
 [<ffffffff832b081e>] xfrm_state_walk_done+0x6e/0xa0 net/xfrm/xfrm_state.c:1675
 [<ffffffff832cfd73>] xfrm_dump_sa_done+0x73/0xa0 net/xfrm/xfrm_user.c:913
 [<ffffffff82f80f21>] netlink_dump+0x871/0xb40 net/netlink/af_netlink.c:2158
 [<ffffffff82f8570e>] __netlink_dump_start+0x52e/0x7c0 net/netlink/af_netlink.c:2223
 [<ffffffff832d035d>] netlink_dump_start include/linux/netlink.h:175 [inline]
 [<ffffffff832d035d>] xfrm_user_rcv_msg+0x5bd/0x6b0 net/xfrm/xfrm_user.c:2512
 [<ffffffff82f8adee>] netlink_rcv_skb+0x13e/0x370 net/netlink/af_netlink.c:2305
 [<ffffffff832cc6ef>] xfrm_netlink_rcv+0x6f/0x90 net/xfrm/xfrm_user.c:2533
 [<ffffffff82f89972>] netlink_unicast_kernel net/netlink/af_netlink.c:1223 [inline]
 [<ffffffff82f89972>] netlink_unicast+0x522/0x760 net/netlink/af_netlink.c:1249
 [<ffffffff82f8a498>] netlink_sendmsg+0x8e8/0xc50 net/netlink/af_netlink.c:1803
 [<ffffffff82dec59a>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82dec59a>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82dec806>] sock_write_iter+0x226/0x3b0 net/socket.c:834
 [<ffffffff8151b0ec>] new_sync_write fs/read_write.c:478 [inline]
 [<ffffffff8151b0ec>] __vfs_write+0x33c/0x450 fs/read_write.c:491
 [<ffffffff8151cd1a>] vfs_write+0x18a/0x530 fs/read_write.c:538
 [<ffffffff8151f409>] SYSC_write fs/read_write.c:585 [inline]
 [<ffffffff8151f409>] SyS_write+0xd9/0x1b0 fs/read_write.c:577
 [<ffffffff83773d36>] entry_SYSCALL_64_fastpath+0x16/0x76
Code: c4 0f 84 94 00 00 00 48 b8 00 02 00 00 00 00 ad de 48 39 c3 0f 84 a5 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 e8 00 00 00 4c 8b 03 49 39 c8 0f 85 9b 00 00 
RIP  [<ffffffff81d641d6>] __list_del_entry+0x86/0x1d0 lib/list_debug.c:57
 RSP <ffff8801d1147628>
---[ end trace 1a116fbea6ba355f ]---