rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=a09/1/0x4000000000000000 softirq=64111/64119 fqs=5245 
	(t=10501 jiffies g=96073 q=1016)
NMI backtrace for cpu 1
CPU: 1 PID: 16919 Comm: syz-executor.4 Not tainted 5.16.0-next-20220118-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:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 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:343
 print_cpu_stall kernel/rcu/tree_stall.h:604 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
 rcu_pending kernel/rcu/tree.c:3919 [inline]
 rcu_sched_clock_irq.cold+0x5c/0x759 kernel/rcu/tree.c:2617
 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:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:fq_pie_timer+0x162/0x2a0 net/sched/sch_fq_pie.c:383
Code: 70 48 03 75 80 48 8d 7e 44 48 89 f8 48 c1 e8 03 42 0f b6 14 20 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d3 00 00 00 <8b> 56 44 4c 89 ff 83 c3 01 e8 40 b5 ff ff 48 8b 44 24 08 42 0f b6
RSP: 0018:ffffc90000dc0cd0 EFLAGS: 00000246
RAX: 0000000000000007 RBX: 00000000000001c7 RCX: 0000000000000100
RDX: 0000000000000000 RSI: ffff88805194c710 RDI: ffff88805194c754
RBP: ffff888023023b50 R08: 0000000000000400 R09: 0000000000000000
R10: ffffffff876f5a05 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000007 R14: 0000000000000400 R15: ffff888023023b00
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:200
Code: 4a 00 5d be 03 00 00 00 e9 56 bd 70 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 b9 11 8a 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 70 02 00 a9
RSP: 0018:ffffc9000629f800 EFLAGS: 00000282
RAX: 0000000080000002 RBX: ffff88807822a208 RCX: 0000000000000008
RDX: 0000000000000000 RSI: ffff888059501d40 RDI: 0000000000000003
RBP: 0000000000000008 R08: 000000000000001f R09: 0000000000000000
R10: ffffffff81b132f1 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: 00007f984ec5c000
 copy_pte_range mm/memory.c:1048 [inline]
 copy_pmd_range mm/memory.c:1160 [inline]
 copy_pud_range mm/memory.c:1197 [inline]
 copy_p4d_range mm/memory.c:1221 [inline]
 copy_page_range+0xc76/0x4490 mm/memory.c:1294
 dup_mmap kernel/fork.c:612 [inline]
 dup_mm+0xa4e/0x13e0 kernel/fork.c:1451
 copy_mm kernel/fork.c:1503 [inline]
 copy_process+0x71f8/0x7300 kernel/fork.c:2164
 kernel_clone+0xe7/0xab0 kernel/fork.c:2555
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2672
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f984eee4fe9
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:00007f984d85a118 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f984eff7f60 RCX: 00007f984eee4fe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f984ef3f08d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0ba2e77f R14: 00007f984d85a300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	70 48                	jo     0x4a
   2:	03 75 80             	add    -0x80(%rbp),%esi
   5:	48 8d 7e 44          	lea    0x44(%rsi),%rdi
   9:	48 89 f8             	mov    %rdi,%rax
   c:	48 c1 e8 03          	shr    $0x3,%rax
  10:	42 0f b6 14 20       	movzbl (%rax,%r12,1),%edx
  15:	48 89 f8             	mov    %rdi,%rax
  18:	83 e0 07             	and    $0x7,%eax
  1b:	83 c0 03             	add    $0x3,%eax
  1e:	38 d0                	cmp    %dl,%al
  20:	7c 08                	jl     0x2a
  22:	84 d2                	test   %dl,%dl
  24:	0f 85 d3 00 00 00    	jne    0xfd
* 2a:	8b 56 44             	mov    0x44(%rsi),%edx <-- trapping instruction
  2d:	4c 89 ff             	mov    %r15,%rdi
  30:	83 c3 01             	add    $0x1,%ebx
  33:	e8 40 b5 ff ff       	callq  0xffffb578
  38:	48 8b 44 24 08       	mov    0x8(%rsp),%rax
  3d:	42                   	rex.X
  3e:	0f                   	.byte 0xf
  3f:	b6                   	.byte 0xb6