rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=53e/1/0x4000000000000000 softirq=325827/325827 fqs=5235 
	(t=10501 jiffies g=502497 q=102639)
NMI backtrace for cpu 0
CPU: 0 PID: 25160 Comm: syz-executor.5 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x199/0x2a0 kernel/rcu/tree_stall.h:320
 print_cpu_stall kernel/rcu/tree_stall.h:553 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 rcu_pending kernel/rcu/tree.c:3489 [inline]
 rcu_sched_clock_irq+0x1928/0x1eb0 kernel/rcu/tree.c:2504
 update_process_times+0x12c/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:176 [inline]
 tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x42d/0x930 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0xf0/0x260 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0xb9/0x130 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
RIP: 0010:check_kcov_mode kernel/kcov.c:174 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:218 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x31/0xa0 kernel/kcov.c:284
Code: 14 25 00 fe 01 00 65 8b 05 d8 7d 8d 7e a9 00 01 ff 00 74 10 a9 00 01 00 00 74 6e 83 ba 04 14 00 00 00 74 65 8b 82 e0 13 00 00 <83> f8 03 75 5a 48 8b 8a e8 13 00 00 44 8b 8a e4 13 00 00 49 c1 e1
RSP: 0000:ffffc900052179f8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffff88803d158480
RDX: ffff88803d158480 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff86e2b210 R09: fffffbfff163349f
R10: fffffbfff163349f R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffffffff12c516e R14: 0000000000000002 R15: 00000000000710f3
 rcu_read_unlock include/linux/rcupdate.h:684 [inline]
 inet_twsk_purge+0x720/0x820 net/ipv4/inet_timewait_sock.c:299
 ops_exit_list net/core/net_namespace.c:189 [inline]
 setup_net+0x606/0x770 net/core/net_namespace.c:364
 copy_net_ns+0x339/0x540 net/core/net_namespace.c:482
 create_new_namespaces+0x52e/0x9f0 kernel/nsproxy.c:110
 copy_namespaces+0x2f6/0x370 kernel/nsproxy.c:179
 copy_process+0x203b/0x52f0 kernel/fork.c:2101
 _do_fork+0x134/0x650 kernel/fork.c:2443
 __do_sys_clone kernel/fork.c:2599 [inline]
 __se_sys_clone kernel/fork.c:2580 [inline]
 __x64_sys_clone+0x21c/0x260 kernel/fork.c:2580
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007f6b6c46bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00000000004db5a0 RCX: 000000000045cb29
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000050000103
RBP: 000000000078bf00 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000007c R14: 00000000004c34ba R15: 00007f6b6c46c6d4