rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10500 ticks this GP) idle=202/1/0x4000000000000000 softirq=58553/58553 fqs=0 
	(t=10502 jiffies g=105525 q=93)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g105525 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=53245
rcu: rcu_preempt kthread starved for 10505 jiffies! g105525 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:28864 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4681 [inline]
 __schedule+0x93a/0x26f0 kernel/sched/core.c:5938
 schedule+0xd3/0x270 kernel/sched/core.c:6017
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
 rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10 Comm: kworker/u4:1 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: tipc_rcv tipc_conn_recv_work
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:90 [inline]
RIP: 0010:kvm_wait arch/x86/kernel/kvm.c:888 [inline]
RIP: 0010:kvm_wait+0xaf/0xf0 arch/x86/kernel/kvm.c:871
Code: 10 c3 c3 89 74 24 0c 48 89 3c 24 e8 0b a5 48 00 8b 74 24 0c 48 8b 3c 24 eb 82 e8 1c aa 48 00 eb 07 0f 00 2d d3 c5 55 08 fb f4 <eb> 9b eb 07 0f 00 2d c6 c5 55 08 f4 eb c5 89 74 24 0c 48 89 3c 24
RSP: 0018:ffffc90000cf7b10 EFLAGS: 00000202
RAX: 000000000143e204 RBX: 0000000000000000 RCX: 1ffffffff1fa6caa
RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000
RBP: ffff88802c9e0858 R08: 0000000000000001 R09: ffffffff8fcd59a7
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: ffffed100593c10b R14: 0000000000000001 R15: ffff8880b9c52880
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000056c020 CR3: 0000000030a21000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x8b8/0xb40 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x200/0x2b0 kernel/locking/spinlock_debug.c:113
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 tipc_conn_kref_release+0x47/0x380 net/tipc/topsrv.c:129
 kref_put include/linux/kref.h:65 [inline]
 conn_put net/tipc/topsrv.c:147 [inline]
 tipc_conn_recv_work+0x14a/0x190 net/tipc/topsrv.c:430
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
NMI backtrace for cpu 1
CPU: 1 PID: 16755 Comm: kworker/u4:9 Not tainted 5.14.0-rc5-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:105
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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:342
 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
 rcu_pending kernel/rcu/tree.c:3922 [inline]
 rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2641
 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:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:check_kcov_mode+0x9/0x40 kernel/kcov.c:163
Code: ff 48 89 df e8 e8 41 46 00 e9 a1 fe ff ff 48 8b 3c 24 e8 da 41 46 00 e9 18 fe ff ff cc cc cc cc cc 65 8b 05 49 50 8c 7e 89 c2 <81> e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 34
RSP: 0018:ffffc90003f7fb80 EFLAGS: 00000293
RAX: 0000000000000201 RBX: 000000000000003f RCX: 000000000000003f
RDX: 0000000000000201 RSI: ffff8880333654c0 RDI: 0000000000000003
RBP: dffffc0000000000 R08: 000000007d596296 R09: 0000000000000000
R10: ffffffff83f1abdc R11: 0000000000000000 R12: ffff888145344582
R13: 0000000000000000 R14: 000000007d596296 R15: 0000000000000001
 write_comp_data kernel/kcov.c:218 [inline]
 __sanitizer_cov_trace_cmp8+0x1d/0x70 kernel/kcov.c:264
 __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+0xb0/0x160 net/core/net_namespace.c:175
 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295