TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. BUG: unable to handle kernel NULL pointer dereference at (null) IP: (null) PGD 54aa9067 P4D 54aa9067 PUD 5440b067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 7298 Comm: kworker/1:3 Not tainted 4.14.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: pencrypt padata_serial_worker task: ffff888050740200 task.stack: ffff888050748000 RIP: 0010: (null) RSP: 0018:ffff88805074fcc8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8880a45af310 RCX: 1ffff1100a0e9fa1 RDX: 1ffff110148b5e5a RSI: 0000000000000000 RDI: ffff8880a45af2c0 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000002 R10: ffff888050740ad8 R11: ffff888050740200 R12: 0000000000000001 R13: ffff88805074fd08 R14: ffff8880a45af318 R15: ffff8880a5918480 FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000054aa8000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: padata_serial_worker+0x269/0x400 kernel/padata.c:317 process_one_work+0x813/0x1540 kernel/workqueue.c:2116 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: Bad RIP value. RIP: (null) RSP: ffff88805074fcc8 CR2: 0000000000000000 ---[ end trace 16a935ce56356d10 ]---