syzbot

random: sshd: uninitialized urandom read (32 bytes read)
urandom_read: 1 callbacks suppressed
random: sshd: uninitialized urandom read (32 bytes read)
audit: type=1400 audit(1546837336.017:7): avc:  denied  { map } for  pid=1764 comm="syz-executor440" path="/root/syz-executor440467685" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
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kernel BUG at net/core/skbuff.c:1452!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
Modules linked in:
CPU: 0 PID: 1767 Comm: syz-executor440 Not tainted 4.14.91+ #3
task: ffff8881ce2a1780 task.stack: ffff8881cc0e8000
RIP: 0010:pskb_expand_head+0xa7c/0xb30 net/core/skbuff.c:1452
RSP: 0018:ffff8881cc0ef8e0 EFLAGS: 00010297
RAX: ffff8881ce2a1780 RBX: ffff8881ccfb0500 RCX: 0000000001080020
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881ccfb05dc
RBP: 0000000001080020 R08: ffff8881ccfb05ba R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881ccfb05c4
R13: 0000000000000000 R14: 000000000000003f R15: ffff8881ccfb0500
FS:  00007fdcc63e4700(0000) GS:ffff8881d7600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdcc63e3e78 CR3: 00000001cc328002 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __pskb_pull_tail+0xc8/0x1390 net/core/skbuff.c:1888
 pskb_may_pull include/linux/skbuff.h:2132 [inline]
 ip6_datagram_recv_specific_ctl+0x1493/0x16e0 net/ipv6/datagram.c:715
 rawv6_recvmsg+0x8f3/0xb50 net/ipv6/raw.c:521
 sock_common_recvmsg+0xf6/0x190 net/core/sock.c:2946
 sock_recvmsg_nosec net/socket.c:818 [inline]
 sock_recvmsg net/socket.c:825 [inline]
 sock_recvmsg+0xc2/0x100 net/socket.c:821
 SYSC_recvfrom net/socket.c:1814 [inline]
 SyS_recvfrom+0x1a8/0x2e0 net/socket.c:1786
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
Code: 48 8b 7c 24 18 e8 55 e1 25 ff e9 fd f6 ff ff 4c 89 f7 e8 48 e1 25 ff e9 8d fd ff ff e8 3e e1 25 ff e9 76 fc ff ff e8 e4 f4 03 ff <0f> 0b 48 8b 7c 24 18 e8 28 e1 25 ff e9 dd fa ff ff 4c 89 f7 e8 
RIP: pskb_expand_head+0xa7c/0xb30 net/core/skbuff.c:1452 RSP: ffff8881cc0ef8e0
---[ end trace e5c2c4f08cbfae01 ]---