TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 28011 at net/core/stream.c:208 sk_stream_kill_queues.cold+0x29/0x48 net/core/stream.c:208
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 28011 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
page:ffffea0002445400 count:0 mapcount:-128 mapping:0000000000000000 index:0x0
 __warn.cold+0x20/0x5a kernel/panic.c:541
flags: 0xfff00000000000()
 report_bug+0x262/0x2b0 lib/bug.c:183
raw: 00fff00000000000 ffffea000156a408 ffffea00028cbc08 0000000000000000
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:sk_stream_kill_queues.cold+0x29/0x48 net/core/stream.c:208
page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)
Code: fe e8 b0 e3 50 f9 48 c7 c7 00 5c 4c 89 e8 0f 15 e2 ff 0f 0b e9 b8 1e 61 fe e8 98 e3 50 f9 48 c7 c7 00 5c 4c 89 e8 f7 14 e2 ff <0f> 0b e9 d9 1e 61 fe e8 80 e3 50 f9 48 c7 c7 00 5c 4c 89 e8 df 14
RSP: 0018:ffff8880a9a67820 EFLAGS: 00010286
RAX: 0000000000000024 RBX: 000000000000011b RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed101534cef6
------------[ cut here ]------------
RBP: 0000000000000000 R08: 0000000000000024 R09: 0000000000000000
kernel BUG at include/linux/mm.h:519!
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880967326b0
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
R13: ffff8880967325f8 R14: ffff8880967324e8 R15: ffffffff8dd902c0
CPU: 1 PID: 27991 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 inet_csk_destroy_sock+0x198/0x400 net/ipv4/inet_connection_sock.c:877
RIP: 0010:put_page_testzero include/linux/mm.h:519 [inline]
RIP: 0010:put_page include/linux/mm.h:962 [inline]
RIP: 0010:__skb_frag_unref include/linux/skbuff.h:2842 [inline]
RIP: 0010:skb_release_data+0x3bf/0x920 net/core/skbuff.c:577
 tcp_close+0x95f/0xfd0 net/ipv4/tcp.c:2498
Code: b4 0a fb e9 2a fe ff ff e8 3e c9 f1 fa 48 8d 6b ff e9 b5 fe ff ff e8 30 c9 f1 fa 48 c7 c6 20 50 4c 89 48 89 ef e8 e1 5a 19 fb <0f> 0b 4c 8b 34 24 e8 16 c9 f1 fa 49 8d 7e 08 48 b8 00 00 00 00 00
RSP: 0018:ffff8880ba107688 EFLAGS: 00010206
 tls_sk_proto_close+0x757/0xc20 net/tls/tls_main.c:312
RAX: ffff888053e5a040 RBX: ffffea0002445434 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff8670bc4f RDI: ffffea0002445438
RBP: ffffea0002445400 R08: 000000000000003e R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001
 inet_release+0xd7/0x1e0 net/ipv4/af_inet.c:427
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880a9a770c0
 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:472
FS:  00007fb7e3f3f700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
 __sock_release+0xcd/0x2a0 net/socket.c:599
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31745000 CR3: 000000009f104000 CR4: 00000000003406e0
 sock_close+0x15/0x20 net/socket.c:1214
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 __fput+0x2ce/0x890 fs/file_table.c:278
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
Call Trace:
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xbf3/0x2be0 kernel/exit.c:870
 <IRQ>
 skb_release_all net/core/skbuff.c:640 [inline]
 __kfree_skb+0x46/0x60 net/core/skbuff.c:654
 sk_wmem_free_skb include/net/sock.h:1468 [inline]
 tcp_write_queue_purge+0x24d/0x800 net/ipv4/tcp.c:2543
 tcp_reset+0xfe/0x490 net/ipv4/tcp_input.c:4085
 tcp_validate_incoming+0x117d/0x1670 net/ipv4/tcp_input.c:5456
 do_group_exit+0x125/0x310 kernel/exit.c:967
 tcp_rcv_established+0x641/0x1ef0 net/ipv4/tcp_input.c:5666
 get_signal+0x3f2/0x1f70 kernel/signal.c:2589
 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799
 tcp_v6_do_rcv+0xe1e/0x1370 net/ipv6/tcp_ipv6.c:1348
 tcp_v6_rcv+0x26b8/0x3990 net/ipv6/tcp_ipv6.c:1577
 ip6_input_finish+0x46a/0x17a0 net/ipv6/ip6_input.c:385
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip6_input+0xcf/0x3c0 net/ipv6/ip6_input.c:428
 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath+0x3f0/0x4a0 arch/x86/entry/common.c:271
 dst_input include/net/dst.h:461 [inline]
 ip6_rcv_finish+0x1d9/0x2f0 net/ipv6/ip6_input.c:76
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:407
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ipv6_rcv+0xf2/0x3f0 net/ipv6/ip6_input.c:273
RIP: 0033:0x7f7b8b3bf531
Code: Bad RIP value.
RSP: 002b:00007f7b89b232f0 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 00007f7b89b23700 RCX: 00007f7b8b3bf531
RDX: 00007f7b89b239d0 RSI: 00007f7b89b232f0 RDI: 00000000003d0f00
RBP: 00007ffe3348cd00 R08: 00007f7b89b23700 R09: 00007f7b89b23700
R10: 00007f7b89b239d0 R11: 0000000000000206 R12: 00007ffe3348cb6e
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:4954
R13: 00007ffe3348cb6f R14: 00007f7b89b23300 R15: 0000000000022000
 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066
 process_backlog+0x241/0x700 net/core/dev.c:5849
 napi_poll net/core/dev.c:6280 [inline]
 net_rx_action+0x4ac/0xfb0 net/core/dev.c:6346
 __do_softirq+0x265/0x980 kernel/softirq.c:292
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1092
 </IRQ>
 do_softirq.part.0+0x160/0x1c0 kernel/softirq.c:336
 do_softirq kernel/softirq.c:328 [inline]
 __local_bh_enable_ip+0x20e/0x270 kernel/softirq.c:189
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 inet_csk_listen_stop+0x1e7/0x8a0 net/ipv4/inet_connection_sock.c:1033
 tcp_close+0xca3/0xfd0 net/ipv4/tcp.c:2351
 inet_release+0xd7/0x1e0 net/ipv4/af_inet.c:427
 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:472
 __sock_release+0xcd/0x2a0 net/socket.c:599
 sock_close+0x15/0x20 net/socket.c:1214
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fb7e55ca109
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb7e3f3f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000021
RAX: 0000000000000004 RBX: 00007fb7e56dcf60 RCX: 00007fb7e55ca109
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007fb7e562408d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffddc2d42af R14: 00007fb7e3f3f300 R15: 0000000000022000
Modules linked in:
Kernel Offset: disabled
Rebooting in 86400 seconds..