rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10500 ticks this GP) idle=a8d/1/0x4000000000000000 softirq=267271/267271 fqs=0 
	(t=10500 jiffies g=500173 q=169)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g500173 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=226408
rcu: rcu_preempt kthread starved for 10500 jiffies! g500173 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:28688 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4969 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6250
 schedule+0xd2/0x260 kernel/sched/core.c:6323
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1955
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2128
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 19662 Comm: kworker/u4:2 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:481
 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x98/0x746 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:check_kcov_mode+0x26/0x40 kernel/kcov.c:168
Code: cc cc cc cc 65 8b 05 39 ae 8a 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 a4 15 00 00 85 d2 74 0b <8b> 86 80 15 00 00 39 f8 0f 94 c0 c3 66 66 2e 0f 1f 84 00 00 00 00
RSP: 0018:ffffc9000355fb78 EFLAGS: 00000246
RAX: 0000000000000201 RBX: 0000000000000002 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffff88801eafd700 RDI: 0000000000000003
RBP: dffffc0000000000 R08: 0000000000000002 R09: 0000000000000000
R10: ffffffff83f626a5 R11: 0000000000000000 R12: ffff88803b4deec2
R13: ffffed100794b293 R14: 000000007bf8b853 R15: 0000000000000001
 write_comp_data kernel/kcov.c:221 [inline]
 __sanitizer_cov_trace_const_cmp8+0x1d/0x70 kernel/kcov.c:294
 radix_tree_load_root lib/radix-tree.c:393 [inline]
 __radix_tree_lookup+0x75/0x2a0 lib/radix-tree.c:756
 tipc_topsrv_stop net/tipc/topsrv.c:691 [inline]
 tipc_topsrv_exit_net+0x20a/0x5d0 net/tipc/topsrv.c:715
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 19662 Comm: kworker/u4:2 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:check_kcov_mode+0x26/0x40 kernel/kcov.c:168
Code: cc cc cc cc 65 8b 05 39 ae 8a 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 a4 15 00 00 85 d2 74 0b <8b> 86 80 15 00 00 39 f8 0f 94 c0 c3 66 66 2e 0f 1f 84 00 00 00 00
RSP: 0018:ffffc9000355fb78 EFLAGS: 00000246
RAX: 0000000000000201 RBX: 0000000000000002 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffff88801eafd700 RDI: 0000000000000003
RBP: dffffc0000000000 R08: 0000000000000002 R09: 0000000000000000
R10: ffffffff83f626a5 R11: 0000000000000000 R12: ffff88803b4deec2
R13: ffffed100794b293 R14: 000000007bf8b853 R15: 0000000000000001
 write_comp_data kernel/kcov.c:221 [inline]
 __sanitizer_cov_trace_const_cmp8+0x1d/0x70 kernel/kcov.c:294
 radix_tree_load_root lib/radix-tree.c:393 [inline]
 __radix_tree_lookup+0x75/0x2a0 lib/radix-tree.c:756
 tipc_topsrv_stop net/tipc/topsrv.c:691 [inline]
 tipc_topsrv_exit_net+0x20a/0x5d0 net/tipc/topsrv.c:715
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	cc                   	int3
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	65 8b 05 39 ae 8a 7e 	mov    %gs:0x7e8aae39(%rip),%eax        # 0x7e8aae44
   b:	89 c2                	mov    %eax,%edx
   d:	81 e2 00 01 00 00    	and    $0x100,%edx
  13:	a9 00 01 ff 00       	test   $0xff0100,%eax
  18:	74 10                	je     0x2a
  1a:	31 c0                	xor    %eax,%eax
  1c:	85 d2                	test   %edx,%edx
  1e:	74 15                	je     0x35
  20:	8b 96 a4 15 00 00    	mov    0x15a4(%rsi),%edx
  26:	85 d2                	test   %edx,%edx
  28:	74 0b                	je     0x35
* 2a:	8b 86 80 15 00 00    	mov    0x1580(%rsi),%eax <-- trapping instruction
  30:	39 f8                	cmp    %edi,%eax
  32:	0f 94 c0             	sete   %al
  35:	c3                   	retq
  36:	66                   	data16
  37:	66                   	data16
  38:	2e                   	cs
  39:	0f                   	.byte 0xf
  3a:	1f                   	(bad)
  3b:	84 00                	test   %al,(%rax)
  3d:	00 00                	add    %al,(%rax)