TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 1 PID: 12441 Comm: syz-executor7 Not tainted 4.18.0-rc7+ #175
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:smc_tx_prepared_sends+0x2c3/0x550 net/smc/smc_tx.h:27
Code: 48 89 f8 48 c1 e8 03 80 3c 10 00 0f 85 11 02 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 76 38 49 8d 7e 20 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e de 01 00 00 41 8b 46 20 49 8d 
RSP: 0018:ffff880193a67560 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 1ffff1003274ceae RCX: dffffc0000000000
RDX: 0000000000000004 RSI: 1ffff1003274ceba RDI: 0000000000000020
RBP: ffff880193a67738 R08: ffffed003274cebb R09: ffffed003274ceba
R10: ffffed003274ceba R11: ffff880193a675d7 R12: ffff880193a67710
R13: ffff880193a675d0 R14: 0000000000000000 R15: ffff880193a67590
FS:  00007f865bb85700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001bcb3b000 CR4: 00000000001406e0
Call Trace:
 smc_ioctl+0x36c/0xd90 net/smc/af_smc.c:1565
 sock_do_ioctl+0xe4/0x3e0 net/socket.c:970
 sock_ioctl+0x30d/0x680 net/socket.c:1094
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x456b29
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f865bb84c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f865bb856d4 RCX: 0000000000456b29
RDX: 0000000020000040 RSI: 000000000000894b RDI: 0000000000000015
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d1388 R14: 00000000004bf5d8 R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 6a4f748796b35f05 ]---
RIP: 0010:smc_tx_prepared_sends+0x2c3/0x550 net/smc/smc_tx.h:27
Code: 48 89 f8 48 c1 e8 03 80 3c 10 00 0f 85 11 02 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 76 38 49 8d 7e 20 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e de 01 00 00 41 8b 46 20 49 8d 
RSP: 0018:ffff880193a67560 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 1ffff1003274ceae RCX: dffffc0000000000
RDX: 0000000000000004 RSI: 1ffff1003274ceba RDI: 0000000000000020
RBP: ffff880193a67738 R08: ffffed003274cebb R09: ffffed003274ceba
R10: ffffed003274ceba R11: ffff880193a675d7 R12: ffff880193a67710
R13: ffff880193a675d0 R14: 0000000000000000 R15: ffff880193a67590
FS:  00007f865bb85700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001bcb3b000 CR4: 00000000001406e0