rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=8fb/1/0x4000000000000000 softirq=93468/93468 fqs=526 
	(t=10500 jiffies g=152489 q=285)
rcu: rcu_preempt kthread starved for 9440 jiffies! g152489 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:28728 pid:   16 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5073 [inline]
 __schedule+0xa9a/0x4cc0 kernel/sched/core.c:6388
 schedule+0xd2/0x1f0 kernel/sched/core.c:6460
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1884
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1971
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2144
 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:551
NMI backtrace for cpu 0
CPU: 0 PID: 8360 Comm: kworker/u4:15 Not tainted 5.18.0-rc7-syzkaller-00015-gef1302160bfb #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:343
 print_cpu_stall kernel/rcu/tree_stall.h:639 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:723 [inline]
 rcu_pending kernel/rcu/tree.c:3923 [inline]
 rcu_sched_clock_irq.cold+0xa1/0x8d6 kernel/rcu/tree.c:2625
 update_process_times+0x16d/0x200 kernel/time/timer.c:1788
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1473
 __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:645
RIP: 0010:write_comp_data kernel/kcov.c:221 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp8+0x18/0x70 kernel/kcov.c:267
Code: 48 89 74 38 e8 4e 89 54 c8 20 48 89 10 c3 0f 1f 40 00 49 89 f8 bf 03 00 00 00 4c 8b 14 24 48 89 f1 65 48 8b 34 25 00 70 02 00 <e8> 23 f8 ff ff 84 c0 74 48 48 8b 86 88 15 00 00 8b b6 84 15 00 00
RSP: 0018:ffffc90013cd7b78 EFLAGS: 00000293
RAX: 0000000000000040 RBX: 000000000000003f RCX: 000000000000003f
RDX: ffff888019983b00 RSI: ffff888019983b00 RDI: 0000000000000003
RBP: dffffc0000000000 R08: ffffffff82d42dc3 R09: 0000000000000000
R10: ffffffff841c3c8c R11: 0000000000000000 R12: ffff888046a76c02
R13: 0000000000000000 R14: ffffffff82d42dc3 R15: 0000000000000001
 __radix_tree_lookup+0xdc/0x2a0 lib/radix-tree.c:757
 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):
   0:	48 89 74 38 e8       	mov    %rsi,-0x18(%rax,%rdi,1)
   5:	4e 89 54 c8 20       	mov    %r10,0x20(%rax,%r9,8)
   a:	48 89 10             	mov    %rdx,(%rax)
   d:	c3                   	retq
   e:	0f 1f 40 00          	nopl   0x0(%rax)
  12:	49 89 f8             	mov    %rdi,%r8
  15:	bf 03 00 00 00       	mov    $0x3,%edi
  1a:	4c 8b 14 24          	mov    (%rsp),%r10
  1e:	48 89 f1             	mov    %rsi,%rcx
  21:	65 48 8b 34 25 00 70 	mov    %gs:0x27000,%rsi
  28:	02 00
* 2a:	e8 23 f8 ff ff       	callq  0xfffff852 <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	74 48                	je     0x7b
  33:	48 8b 86 88 15 00 00 	mov    0x1588(%rsi),%rax
  3a:	8b b6 84 15 00 00    	mov    0x1584(%rsi),%esi