rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=8f44/1/0x4000000000000000 softirq=25348/25349 fqs=0
rcu: 	(detected by 1, t=25780 jiffies, g=17885, q=25 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6742 Comm: syz.2.258 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:__virt_addr_valid+0x28/0x390
Code: 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 49 bc 00 00 00 00 00 fc ff df 49 89 fe 49 81 ee 00 00 00 80 0f 83 dc 02 00 00 <48> 89 fb 48 c7 c0 00 cf 25 8e 48 c1 e8 03 42 80 3c 20 00 74 0c 48
RSP: 0018:ffffc900000071f0 EFLAGS: 00000287
RAX: 1ffff110044fa632 RBX: ffff8880227d3190 RCX: 0000000000000500
RDX: 0000000000000002 RSI: ffffffff8dfa6837 RDI: ffff8880227d3190
RBP: 0000000000000000 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: dffffc0000000000
R13: 0000000000000000 R14: ffff8880a27d3190 R15: 1ffff11020c67e33
FS:  0000000000000000(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001095f5000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 kasan_addr_to_slab+0xf/0x70
 kasan_record_aux_stack+0xf/0xd0
 call_rcu+0xee/0x890
 __dev_queue_xmit+0x4e5/0x3950
 macvlan_start_xmit+0x3ba/0x600
 dev_hard_start_xmit+0x2cd/0x830
 __dev_queue_xmit+0x14d9/0x3950
 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:lock_release+0x2d7/0x3c0
Code: 90 97 11 00 00 00 00 eb b5 e8 45 e0 06 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 35 4b 97 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 9a d3 09 0a cc 48 8d 3d 32 33 92
RSP: 0018:ffffc90006d27708 EFLAGS: 00000282
RAX: 59d702f1582ad200 RBX: 0000000000000202 RCX: 0000000000000046
RDX: 0000000000000002 RSI: ffffffff8e219b45 RDI: ffffffff8c28af60
RBP: ffff888174d68be0 R08: ffffffff823a0e59 R09: ffffffff8e95cd60
R10: dffffc0000000000 R11: fffffbfff20616df R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8e95cd60 R15: ffff888174d68000
 percpu_ref_put+0xf9/0x180
 __memcg_slab_free_hook+0x3bc/0x4b0
 kmem_cache_free+0x381/0x650
 unlink_anon_vmas+0x368/0x730
 free_pgtables+0x663/0xb70
 exit_mmap+0x490/0x9e0
 __mmput+0x118/0x430
 exit_mm+0x18e/0x250
 do_exit+0x6a2/0x22c0
 do_group_exit+0x21b/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x221a/0x2240
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff4f4f9cdd9
Code: Unable to access opcode bytes at 0x7ff4f4f9cdaf.
RSP: 002b:00007ffe318b6a18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff4f4f9cdd9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe318b6a7c R08: 0000000000000000 R09: 00000000000927c0
R10: 00007ff4f5216038 R11: 0000000000000246 R12: 000000000000004a
R13: 00000000000927c0 R14: 0000000000018ea6 R15: 00007ffe318b6ad0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 25779 jiffies! g17885 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3792
rcu: rcu_preempt kthread starved for 25806 jiffies! g17885 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:27640 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: 6748 Comm: syz.0.260 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:ffffc90006cf6d10 EFLAGS: 00000206
RAX: 000000000033ddeb 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:  00007fd562b7c6c0(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000016b594000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 000000007240f3a3 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 irqentry_exit+0x14f/0x760
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:lock_release+0x0/0x3c0
Code: be 00 00 50 00 e9 70 fe ff ff 41 be 2f 00 00 00 e9 0e ff ff ff 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 30 49 89 f5 49
RSP: 0018:ffffc90006cf6e30 EFLAGS: 00000282
RAX: 2031135fab54d800 RBX: dffffc0000000000 RCX: 0000000000000046
RDX: 00000000869e1a00 RSI: ffffffff8218804f RDI: ffff8881722cb438
RBP: 0000000000000000 R08: ffffffff8218804f R09: ffff8881722cb438
R10: dffffc0000000000 R11: ffffed102ed6f2d9 R12: ffff888000000000
R13: 0000200000fe8000 R14: 0000000000000029 R15: 000000000000000f
 __kvm_read_guest_page+0x179/0x240
 kvm_fetch_guest_virt+0x12b/0x170
 __do_insn_fetch_bytes+0x31c/0x700
 x86_decode_insn+0x38e/0x5df0
 x86_emulate_instruction+0x64a/0x2100
 kvm_mmu_page_fault+0x91a/0xb70
 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: 0033:0x7fd561d9cdd9
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:00007fd562b7c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd562015fa0 RCX: 00007fd561d9cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fd561e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd562016038 R14: 00007fd562015fa0 R15: 00007ffe77fa8288
 </TASK>
