rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10501 ticks this GP) idle=093/1/0x4000000000000000 softirq=146348/146348 fqs=0
	(t=10502 jiffies g=233717 q=50 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g233717 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=117824
rcu: rcu_preempt kthread starved for 10505 jiffies! g233717 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:28376 pid:   17 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5109 [inline]
 __schedule+0xa9a/0x4cc0 kernel/sched/core.c:6424
 schedule+0xd2/0x1f0 kernel/sched/core.c:6496
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1907
 rcu_gp_fqs_loop+0x1c0/0x840 kernel/rcu/tree.c:2078
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2267
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 4098 Comm: kworker/u4:12 Not tainted 5.18.0-rc5-next-20220506-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:111
 nmi_trigger_cpumask_backtrace+0x1e6/0x230 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:512
 print_cpu_stall kernel/rcu/tree_stall.h:657 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:744 [inline]
 rcu_pending kernel/rcu/tree.c:4068 [inline]
 rcu_sched_clock_irq.cold+0xfa/0x77b kernel/rcu/tree.c:2755
 update_process_times+0x16d/0x200 kernel/time/timer.c:1811
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1481
 __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:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:210
Code: 82 80 15 00 00 83 f8 02 75 20 48 8b 8a 88 15 00 00 8b 92 84 15 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 <c3> 0f 1f 00 41 55 41 54 49 89 fc 55 48 bd eb 83 b5 80 46 86 c8 61
RSP: 0018:ffffc90005acfbc0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 000000007aea3124 RCX: 0000000000000000
RDX: ffff888022928000 RSI: ffffffff841e3a5d RDI: ffff88807847e400
RBP: ffff88807847e400 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff88e74459 R11: 0000000000000000 R12: ffff88807847e458
R13: ffffed100f08fc93 R14: ffff88802cdaaa00 R15: 0000000000000001
 idr_find+0xd/0x50 lib/idr.c:174
 tipc_topsrv_stop net/tipc/topsrv.c:691 [inline]
 tipc_topsrv_exit_net+0x20a/0x5d0 net/tipc/topsrv.c:715
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
NMI backtrace for cpu 1
CPU: 1 PID: 4098 Comm: kworker/u4:12 Not tainted 5.18.0-rc5-next-20220506-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:111
 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x262/0x3f0 kernel/rcu/tree_stall.h:369
 print_cpu_stall kernel/rcu/tree_stall.h:659 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:744 [inline]
 rcu_pending kernel/rcu/tree.c:4068 [inline]
 rcu_sched_clock_irq.cold+0xff/0x77b kernel/rcu/tree.c:2755
 update_process_times+0x16d/0x200 kernel/time/timer.c:1811
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1481
 __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:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:210
Code: 82 80 15 00 00 83 f8 02 75 20 48 8b 8a 88 15 00 00 8b 92 84 15 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 <c3> 0f 1f 00 41 55 41 54 49 89 fc 55 48 bd eb 83 b5 80 46 86 c8 61
RSP: 0018:ffffc90005acfbc0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 000000007aea3124 RCX: 0000000000000000
RDX: ffff888022928000 RSI: ffffffff841e3a5d RDI: ffff88807847e400
RBP: ffff88807847e400 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff88e74459 R11: 0000000000000000 R12: ffff88807847e458
R13: ffffed100f08fc93 R14: ffff88802cdaaa00 R15: 0000000000000001
 idr_find+0xd/0x50 lib/idr.c:174
 tipc_topsrv_stop net/tipc/topsrv.c:691 [inline]
 tipc_topsrv_exit_net+0x20a/0x5d0 net/tipc/topsrv.c:715
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	80 15 00 00 83 f8 02 	adcb   $0x2,-0x77d0000(%rip)        # 0xf8830007
   7:	75 20                	jne    0x29
   9:	48 8b 8a 88 15 00 00 	mov    0x1588(%rdx),%rcx
  10:	8b 92 84 15 00 00    	mov    0x1584(%rdx),%edx
  16:	48 8b 01             	mov    (%rcx),%rax
  19:	48 83 c0 01          	add    $0x1,%rax
  1d:	48 39 c2             	cmp    %rax,%rdx
  20:	76 07                	jbe    0x29
  22:	48 89 34 c1          	mov    %rsi,(%rcx,%rax,8)
  26:	48 89 01             	mov    %rax,(%rcx)
* 29:	c3                   	retq <-- trapping instruction
  2a:	0f 1f 00             	nopl   (%rax)
  2d:	41 55                	push   %r13
  2f:	41 54                	push   %r12
  31:	49 89 fc             	mov    %rdi,%r12
  34:	55                   	push   %rbp
  35:	48 bd eb 83 b5 80 46 	movabs $0x61c8864680b583eb,%rbp
  3c:	86 c8 61