------------[ cut here ]------------
WARNING: CPU: 0 PID: 44 at kernel/rcu/tree_stall.h:898 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:890
Modules linked in:
CPU: 0 PID: 44 Comm: kcompactd0 Not tainted 5.17.0-rc3-syzkaller-00043-gf4bc5bbb5fef #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:898
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 c0 38 51 90 e8 9e 48 5b 00 b8 01 00 00 00 87 05 f3 03 ee 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd 40 a7 b8 8b 48 c7 c3 6c be 93 8d 74 58 48 b8 00 00
RSP: 0018:ffffc90000007e40 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000100030c52 RCX: ffffffff816334c2
RDX: fffffbfff20a2718 RSI: 0000000000000004 RDI: ffffffff905138c0
RBP: ffffffff8bb8a740 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff20a2718 R11: 0000000000000001 R12: 1ffffffff1701e30
R13: 0000000000000246 R14: ffff88802ca3ab92 R15: 000000000000000a
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555585f848 CR3: 000000005603b000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:861 [inline]
 rcu_core+0x4e6/0x1540 kernel/rcu/tree.c:2773
 __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:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x447/0xc90 kernel/smp.c:969
Code: 0b 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 cb 8b 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 95 06 00 00 8b 43 08 31
RSP: 0018:ffffc900008c7698 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff88802cc3df40 RCX: 0000000000000000
RDX: ffff888014268000 RSI: ffffffff816c2275 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff816c229b R11: 0000000000000000 R12: ffffed1005987be9
R13: 0000000000000002 R14: ffff88802cc3df48 R15: 0000000000000001
 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1135
 __buffer_migrate_page+0x852/0xa80 mm/migrate.c:706
 move_to_new_page+0x339/0xf00 mm/migrate.c:873
 __unmap_and_move mm/migrate.c:1038 [inline]
 unmap_and_move mm/migrate.c:1105 [inline]
 migrate_pages+0x2b8e/0x3e90 mm/migrate.c:1388
 compact_zone+0x1ada/0x3850 mm/compaction.c:2400
 proactive_compact_node+0x103/0x1c0 mm/compaction.c:2654
 kcompactd+0x5b4/0xf30 mm/compaction.c:2964
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	0b 00                	or     (%rax),%eax
   2:	85 ed                	test   %ebp,%ebp
   4:	74 4d                	je     0x53
   6:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   d:	fc ff df
  10:	4d 89 f4             	mov    %r14,%r12
  13:	4c 89 f5             	mov    %r14,%rbp
  16:	49 c1 ec 03          	shr    $0x3,%r12
  1a:	83 e5 07             	and    $0x7,%ebp
  1d:	49 01 c4             	add    %rax,%r12
  20:	83 c5 03             	add    $0x3,%ebp
  23:	e8 cb 8b 0b 00       	callq  0xb8bf3
  28:	f3 90                	pause
* 2a:	41 0f b6 04 24       	movzbl (%r12),%eax <-- trapping instruction
  2f:	40 38 c5             	cmp    %al,%bpl
  32:	7c 08                	jl     0x3c
  34:	84 c0                	test   %al,%al
  36:	0f 85 95 06 00 00    	jne    0x6d1
  3c:	8b 43 08             	mov    0x8(%rbx),%eax
  3f:	31                   	.byte 0x31