rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (10 ticks this GP) idle=e41c/1/0x4000000000000000 softirq=163580/163580 fqs=8
rcu: 	(detected by 1, t=10502 jiffies, g=190277, q=509 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3624 Comm: syz.3.12155 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:check_preemption_disabled+0x6/0xe0
Code: c7 c6 c0 b5 28 8c eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 <65> 8b 05 b7 bf 90 07 65 8b 0d ac bf 90 07 f7 c1 ff ff ff 7f 74 0c
RSP: 0018:ffffc90000007ae8 EFLAGS: 00000087
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8c28b5c0 RDI: ffffffff8c28b580
RBP: ffffffff84bcc77c R08: 0000000000000001 R09: 0000000000000000
R10: ffff88811da9f308 R11: ffffed1023b53e63 R12: 0000000000000000
R13: ffffffff9a649c08 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818dc90000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555830d19e8 CR3: 000000000e74a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_is_watching+0x15/0xb0
 lock_acquire+0x5f/0x350
 _raw_spin_lock_irqsave+0x40/0x60
 debug_object_deactivate+0x6c/0x3a0
 __hrtimer_run_queues+0x23a/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:handle_softirqs+0x160/0x840
Code: 89 6c 24 20 0f b7 db 48 c7 c7 20 1d cb 8b e8 c7 71 20 0a 65 66 c7 05 95 30 b1 11 00 00 e8 f8 ff 45 00 fb 48 c7 c5 c0 a0 60 8e <b8> ff ff ff ff 0f bc c3 41 89 c6 41 ff c6 0f 84 09 04 00 00 89 5c
RSP: 0018:ffffc90000007f28 EFLAGS: 00000206
RAX: 000000000004fc78 RBX: 0000000000000004 RCX: 0000000080000102
RDX: 0000000000000002 RSI: ffffffff8dfa8711 RDI: ffffffff8c28b5e0
RBP: ffffffff8e60a0c0 R08: ffffffff9030b1f7 R09: 1ffffffff206163e
R10: dffffc0000000000 R11: fffffbfff206163f R12: 0000000000000000
R13: 0000000000000000 R14: ffff88801d98bb00 R15: dffffc0000000000
 __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:pfn_valid+0xb3/0x480
Code: 0f e8 f1 d6 88 ff 83 e3 7f c1 e3 05 49 01 df eb 0f e8 e1 d6 88 ff eb 05 e8 da d6 88 ff 45 31 ff bf 01 00 00 00 e8 8d f7 56 ff <48> 8d 1d 00 00 00 00 48 c7 c7 60 ce 95 8e 31 f6 31 d2 b9 02 00 00
RSP: 0018:ffffc90007087318 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 0000000000000640 RCX: ffffffff9a446403
RDX: 0000000000000000 RSI: 0000000000195a32 RDI: 0000000000000001
RBP: ffffc90007087690 R08: ffffea0006568c87 R09: 1ffffd4000cad190
R10: dffffc0000000000 R11: fffff94000cad191 R12: dffffc0000000000
R13: 8000000195a32007 R14: 0000000000195a32 R15: ffff88814febf640
 page_table_check_clear+0x21/0x4f0
 __zap_vma_range+0x3650/0x4b40
 unmap_vmas+0x379/0x530
 exit_mmap+0x280/0x9e0
 __mmput+0x118/0x430
 exit_mm+0x18e/0x250
 do_exit+0x6a2/0x22c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 exit_to_user_mode_loop+0x86/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8fde99cdd9
Code: Unable to access opcode bytes at 0x7f8fde99cdaf.
RSP: 002b:00007f8fdf84a028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007f8fdec16090 RCX: 00007f8fde99cdd9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000007
RBP: 00007f8fdea32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8fdec16128 R14: 00007f8fdec16090 R15: 00007fff00ed16b8
 </TASK>
rcu: rcu_preempt kthread starved for 10486 jiffies! g190277 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:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 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: 163 Comm: kworker/u10:5 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:its_return_thunk+0x0/0x10
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <c3> cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 eb 25 88 f5 cc
RSP: 0018:ffffc900033076f8 EFLAGS: 00000293
RAX: ffffffff81b9abb6 RBX: ffff88823c63c2c8 RCX: ffff88816a3a1d80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003307840 R08: ffffffff9030b1f7 R09: 1ffffffff206163e
R10: dffffc0000000000 R11: fffffbfff206163f R12: 1ffff110242085b9
R13: dffffc0000000000 R14: ffff888121042dc8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6410dea4c0 CR3: 000000000e74a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 smp_call_function_many_cond+0xfe6/0x13d0
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f5/0x1160
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x240
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xab/0x290
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
hpet: Lost 29 RTC interrupts
