rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=68e/1/0x4000000000000000 softirq=184716/184720 fqs=4479 
	(t=10500 jiffies g=271389 q=211304)
NMI backtrace for cpu 0
CPU: 0 PID: 18896 Comm: syz-executor.4 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 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+0x222/0x2a7 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:697 [inline]
 rcu_pending kernel/rcu/tree.c:3830 [inline]
 rcu_sched_clock_irq.cold+0x4f7/0x11dd kernel/rcu/tree.c:2650
 update_process_times+0x16d/0x200 kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 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+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 ae f9 53 f8 48 89 ef e8 e6 af 54 f8 e8 91 3d 74 f8 fb bf 01 00 00 00 <e8> d6 7d 48 f8 65 8b 05 7f 48 fc 76 85 c0 74 02 5d c3 e8 db 9d fa
RSP: 0018:ffffc90000007e10 EFLAGS: 00000206
RAX: 00000000009ea5ac RBX: ffffffff87196ab0 RCX: 1ffffffff1f5a78a
RDX: 0000000000000000 RSI: 0000000000000103 RDI: 0000000000000001
RBP: ffff8880b9c241c0 R08: 0000000000000001 R09: ffffffff8fa9a937
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90000007ea0
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b9c241c0
 expire_timers kernel/time/timer.c:1475 [inline]
 __run_timers.part.0+0x66c/0xa50 kernel/time/timer.c:1745
 __run_timers kernel/time/timer.c:1726 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu kernel/softirq.c:422 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:434
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:__sanitizer_cov_trace_pc+0x59/0x60 kernel/kcov.c:205
Code: 74 2b 8b 82 10 15 00 00 83 f8 02 75 20 48 8b 8a 18 15 00 00 8b 92 14 15 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 <48> 89 01 c3 0f 1f 00 41 55 41 54 49 89 fc 55 48 bd eb 83 b5 80 46
RSP: 0018:ffffc9001b36f768 EFLAGS: 00000212
RAX: 0000000000013809 RBX: 0000000001b83f40 RCX: ffffc90011a84000
RDX: 0000000000040000 RSI: ffffffff81a6efa6 RDI: 0000000000000003
RBP: 1ffff9200366deef R08: 000000000006e0fd R09: 0000000000000000
R10: ffffffff81a6ef50 R11: 0000000000000000 R12: ffffea0001b83f40
R13: 00007f371b7a3000 R14: 000000000023ffff R15: 0000000000000000
 vm_normal_page+0x146/0x2a0 mm/memory.c:658
 copy_present_pte mm/memory.c:866 [inline]
 copy_pte_range mm/memory.c:984 [inline]
 copy_pmd_range mm/memory.c:1064 [inline]
 copy_pud_range mm/memory.c:1101 [inline]
 copy_p4d_range mm/memory.c:1125 [inline]
 copy_page_range+0xddc/0x3fd0 mm/memory.c:1198
 dup_mmap kernel/fork.c:594 [inline]
 dup_mm+0x9ed/0x1380 kernel/fork.c:1368
 copy_mm kernel/fork.c:1424 [inline]
 copy_process+0x2bc8/0x71a0 kernel/fork.c:2113
 kernel_clone+0xe7/0xab0 kernel/fork.c:2500
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2617
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f371acb4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000004bfbb9 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 0000000000a9fb1f R14: 00007f371acb4300 R15: 0000000000022000