flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffff80
raw: ffffea00074ca020 ffff88021fffac18 0000000000000003 0000000000000000
page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:492!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 26486 Comm: syz-executor5 Not tainted 4.17.0-rc6+ #64
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:put_page_testzero include/linux/mm.h:492 [inline]
RIP: 0010:put_page include/linux/mm.h:873 [inline]
RIP: 0010:__skb_frag_unref include/linux/skbuff.h:2756 [inline]
RIP: 0010:skb_release_data+0x6a9/0x860 net/core/skbuff.c:564
RSP: 0018:ffff8801850d6b60 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffffea000611cc1c RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81a5c1d5 RDI: ffffed0030a1ad60
RBP: ffff8801850d6c80 R08: ffff8801852d00c0 R09: ffffed003b5c4fc0
R10: ffffed003b5c4fc0 R11: ffff8801dae27e07 R12: dffffc0000000000
R13: ffffea000611cc00 R14: ffff8801b13a5df0 R15: 0000000000000000
FS:  00007fcf575a0700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcf5759fdb8 CR3: 0000000185cee000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 skb_release_all+0x4a/0x60 net/core/skbuff.c:627
 __kfree_skb+0x15/0x20 net/core/skbuff.c:641
 sk_wmem_free_skb include/net/sock.h:1425 [inline]
 tcp_write_queue_purge+0x2b9/0x8a0 net/ipv4/tcp.c:2366
 tcp_disconnect+0x3ad/0x1390 net/ipv4/tcp.c:2404
 tcp_close+0x100d/0x12b0 net/ipv4/tcp.c:2202
 tls_sk_proto_close+0x777/0xa00 net/tls/tls_main.c:291
 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:427
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:460
 sock_release+0x96/0x1b0 net/socket.c:594
 sock_close+0x16/0x20 net/socket.c:1149
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2482
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007fcf5759fce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072c028 RCX: 0000000000455a09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072c028
RBP: 000000000072c028 R08: 0000000000000000 R09: 000000000072c000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e81f R14: 00007fcf575a09c0 R15: 0000000000000002
Code: d7 e8 bc bd a0 fb 48 8b bd 10 ff ff ff e8 00 e7 fe ff e9 22 fb ff ff e8 a6 bd a0 fb 48 c7 c6 20 37 4b 88 4c 89 ef e8 27 2c cd fb <0f> 0b e8 90 bd a0 fb 4c 8d 6b ff e9 b0 fc ff ff e8 82 bd a0 fb 
RIP: put_page_testzero include/linux/mm.h:492 [inline] RSP: ffff8801850d6b60
RIP: put_page include/linux/mm.h:873 [inline] RSP: ffff8801850d6b60
RIP: __skb_frag_unref include/linux/skbuff.h:2756 [inline] RSP: ffff8801850d6b60
RIP: skb_release_data+0x6a9/0x860 net/core/skbuff.c:564 RSP: ffff8801850d6b60
---[ end trace 7cac32bd7b85ace3 ]---