TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
audit: type=1804 audit(1545612301.051:106): pid=17158 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor5" name="/root/syzkaller-testdir634275448/syzkaller.KcBtTc/334/file0" dev="sda1" ino=17333 res=1
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=52521, q=92)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294996530-4294986027), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor5   R  running task    13736 17145   6332 0x00000000
Call Trace:
 <IRQ>
 sched_show_task.cold.86+0x2b6/0x30a kernel/sched/core.c:5293
 print_other_cpu_stall.cold.66+0x7dd/0x8bb kernel/rcu/tree.c:1286
 check_cpu_stall kernel/rcu/tree.c:1415 [inline]
 rcu_pending kernel/rcu/tree.c:2961 [inline]
 rcu_check_callbacks+0xfe8/0x1410 kernel/rcu/tree.c:2506
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline]
 smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1059
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:check_memory_region+0xc3/0x1b0 mm/kasan/kasan.c:268
Code: 84 a8 00 00 00 48 83 38 00 74 ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 0a 80 38 00 74 f2 48 85 c0 75 77 5b 41 5c 41 5d 5d <c3> 41 bd 08 00 00 00 4d 89 c8 41 29 dd 4b 8d 5c 0d 00 eb 0c 49 83
RSP: 0018:ffff8881bdacf570 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffed1038b5fa31 RBX: ffff8881bdacf698 RCX: ffffffff815fc7c3
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881c5afd180
RBP: ffff8881bdacf578 R08: ffffed1038b5fa31 R09: ffffed1038b5fa30
R10: ffffed1038b5fa30 R11: ffff8881c5afd187 R12: ffff8881819c6000
R13: ffff8881c5afd180 R14: dffffc0000000000 R15: ffffed1037b59ebb
 atomic64_read include/asm-generic/atomic-instrumented.h:27 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:47 [inline]
 __mutex_owner include/linux/mutex.h:75 [inline]
 mutex_spin_on_owner+0x113/0x540 kernel/locking/mutex.c:529
 mutex_optimistic_spin kernel/locking/mutex.c:646 [inline]
 __mutex_lock_common kernel/locking/mutex.c:928 [inline]
 __mutex_lock+0xa85/0x1700 kernel/locking/mutex.c:1072
 mutex_lock_interruptible_nested+0x16/0x20 kernel/locking/mutex.c:1109
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1503 [inline]
 snd_pcm_oss_read+0x3f3/0x820 sound/core/oss/pcm_oss.c:2752
 __vfs_read+0x117/0x9b0 fs/read_write.c:416
 vfs_read+0x17f/0x3c0 fs/read_write.c:452
 ksys_read+0x101/0x260 fs/read_write.c:578
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read fs/read_write.c:586 [inline]
 __x64_sys_read+0x73/0xb0 fs/read_write.c:586
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457669
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe191c52c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669
RDX: 0000000000000008 RSI: 0000000020000180 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe191c536d4
R13: 00000000004c3b17 R14: 00000000004d66a8 R15: 00000000ffffffff
rcu: rcu_preempt kthread starved for 10586 jiffies! g52521 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    23000    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472
 schedule+0xfe/0x460 kernel/sched/core.c:3516
 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804
 rcu_gp_fqs_loop+0x762/0xa80 kernel/rcu/tree.c:1934
 rcu_gp_kthread+0x341/0xc70 kernel/rcu/tree.c:2090
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
sched: RT throttling activated