rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=bbac/1/0x4000000000000000 softirq=77832/77832 fqs=2
rcu: 	(detected by 1, t=29976 jiffies, g=61797, q=224 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5617 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__lock_acquire+0x197b/0x2cf0
Code: 14 25 ff 0f 00 00 39 05 8f 39 9f 12 73 06 89 05 87 39 9f 12 48 8b 02 48 89 df 4c 39 e8 0f 84 2c fe ff ff 4c 89 60 30 48 8b 00 <4c> 39 e8 75 f4 48 89 df e9 18 fe ff ff 48 89 fb 48 c7 c7 10 af 82
RSP: 0000:ffffc90000006e88 EFLAGS: 00000006
RAX: ffffffff93e22dd0 RBX: 00000000000003fd RCX: 00000000000001cc
RDX: ffffffff96cddbc8 RSI: ffff888118bf5720 RDI: 00000000000003fd
RBP: dcb7055098b6fc64 R08: ffffc90000006e50 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff81a21f90 R12: ffffffff96cfff88
R13: ffffffff93e22dd0 R14: ffff888118bf4a00 R15: 00000000000001cb
FS:  00007f25a1ccb280(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bcb006a278 CR3: 000000011ceff000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 lock_acquire+0x106/0x350
 _raw_spin_lock+0x2e/0x40
 pcpu_alloc+0xb3/0x310
 alloc_object+0xbf/0x300
 debug_object_activate+0x15f/0x580
 call_rcu+0x43/0x890
 __dev_queue_xmit+0x4e5/0x3950
 macvlan_start_xmit+0x3ba/0x600
 dev_hard_start_xmit+0x2cd/0x830
 sch_direct_xmit+0x251/0x4c0
 __dev_queue_xmit+0x180f/0x3950
 ip6_output+0x340/0x550
 ndisc_send_skb+0xd0b/0x1670
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:smp_call_function_many_cond+0xfe6/0x13d0
Code: 00 00 00 00 00 fc ff df 75 07 e8 85 03 0c 00 eb 37 f3 90 43 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 6a 03 0c 00 <eb> e5 44 89 f1 80 e1 07 80 c1 03 38 c1 7c e3 4c 89 f7 e8 c3 40 77
RSP: 0000:ffffc9000462f760 EFLAGS: 00000293
RAX: ffffffff81b9be66 RBX: ffff88812103c148 RCX: ffff888118bf4a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000462f8a0 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: 1ffff110478c8169
R13: dffffc0000000000 R14: ffff88823c640b48 R15: 0000000000000001
 on_each_cpu_cond_mask+0x3f/0x80
 kvm_flush_tlb_multi+0x2b4/0x320
 flush_tlb_mm_range+0x5c3/0x10b0
 ptep_clear_flush+0x120/0x170
 do_wp_page+0x3da7/0x4cc0
 handle_mm_fault+0x151d/0x3170
 do_user_addr_fault+0xa73/0x1340
 exc_page_fault+0x6a/0xc0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f25a1d4ea28
Code: 29 48 39 d7 75 0a 48 89 40 28 48 89 40 20 eb 26 48 89 50 20 48 8b 57 20 48 89 48 28 48 89 42 28 48 8b 57 28 48 89 42 20 eb 0c <48> 89 4a 28 48 8b 47 28 48 89 50 20 58 c3 41 57 4c 8d 7f 10 41 56
RSP: 002b:00007ffecb3ae4a0 EFLAGS: 00010206
RAX: 00007f25a1e7a200 RBX: 0000000000005c60 RCX: 000055bcb006a250
RDX: 000055bcb006a250 RSI: 000055bcb0040010 RDI: 000055bcb006a250
RBP: 000055bcb00681f0 R08: 0000000000000000 R09: 07b4e6bd4c9688db
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000003c00
R13: 000055bcb006a250 R14: 00007f25a1e79aa0 R15: 000055bcb0040910
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 29971 jiffies! g61797 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=13099
rcu: rcu_preempt kthread starved for 30003 jiffies! g61797 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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 stack:27968 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 12204 Comm: syz.1.1584 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:preempt_schedule_irq+0x48/0xa0
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 a3 dc e9 f5 e8 3e f3 23 f6 fb bf 01 00 00 00 <e8> 53 a2 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 04 f5 23 f6 bf 01
RSP: 0018:ffffc90003aff3b0 EFLAGS: 00000206
RAX: 00000000003c0705 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000007 RSI: ffffffff8dfa6837 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f59c4fe36c0(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010a758000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 irqentry_exit+0x14f/0x760
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:handle_ept_misconfig+0x94/0x3a0
Code: 04 20 84 c0 0f 85 9e 01 00 00 41 8b 2e bf ff ff ff ff 89 ee e8 1d ed 67 00 85 ed 0f 88 82 00 00 00 b8 00 24 00 00 41 0f 78 c6 <0f> 86 c0 01 00 00 e8 c1 e8 67 00 4c 8d bb e0 02 00 00 4c 89 f8 48
RSP: 0018:ffffc90003aff4d8 EFLAGS: 00000202
RAX: 0000000000002400 RBX: ffff8881148b8000 RCX: 0000000000000002
RDX: ffff888114498000 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: ffff888114498000 R09: 0000000000000007
R10: 0000000000000055 R11: 0000000000000002 R12: dffffc0000000000
R13: ffff8881148b8000 R14: 00000000000fd028 R15: dffffc0000000000
 vmx_handle_exit+0xd70/0x16f0
 vcpu_run+0x5c77/0x7860
 kvm_arch_vcpu_ioctl_run+0x11e6/0x20d0
 kvm_vcpu_ioctl+0xa62/0xfd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59c419cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59c4fe3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f59c4415fa0 RCX: 00007f59c419cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f59c4232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59c4416038 R14: 00007f59c4415fa0 R15: 00007ffd3b4bcb08
 </TASK>
