------------[ cut here ]------------
WARNING: CPU: 0 PID: 5939 at kernel/rcu/tree_stall.h:1015 rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1015
Modules linked in:
CPU: 0 UID: 0 PID: 5939 Comm: udevd Not tainted 6.16.0-rc1-syzkaller-00003-gf09079bd04a9 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:1015
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 c0 6f dc 9a e8 f0 09 81 00 b8 01 00 00 00 87 05 25 97 3a 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 44 3e a8 90 48 81 fd c0 f6 5c 8e 74 5a 48 b8 00
RSP: 0000:ffffc90000007df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a1d890
RDX: fffffbfff35b8df8 RSI: 0000000000000004 RDI: ffffffff9adc6fc0
RBP: ffffffff8e5cf6c0 R08: 0000000000000001 R09: fffffbfff35b8df8
R10: 0000000000000003 R11: 0000000000000001 R12: 1ffffffff1c42240
R13: 0000000000000246 R14: ffffffff8e5cf6c0 R15: ffff88806a43cc92
FS:  00007f5f1e552880(0000) GS:ffff8880d6754000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dea6b9bfe8 CR3: 000000004f3fb000 CR4: 0000000000352ef0
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:978 [inline]
 rcu_core+0x4cf/0x14e0 kernel/rcu/tree.c:2827
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xd7b/0x1510 kernel/smp.c:885
Code: e8 1a 17 0c 00 45 85 ed 74 46 48 8b 14 24 49 89 d6 49 89 d5 49 c1 ee 03 41 83 e5 07 4d 01 e6 41 83 c5 03 e8 b7 1b 0c 00 f3 90 <41> 0f b6 06 41 38 c5 7c 08 84 c0 0f 85 6f 05 00 00 8b 43 08 31 ff
RSP: 0000:ffffc900045f7808 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff88806a5417e0 RCX: ffffffff81b0011d
RDX: ffff888036a72440 RSI: ffffffff81b000f9 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000003 R14: ffffed100d4a82fd R15: ffff88806a43cf40
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052
 kvm_flush_tlb_multi+0x266/0x3b0 arch/x86/kernel/kvm.c:679
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x4a0/0x1790 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline]
 ptep_clear_flush+0x136/0x180 mm/pgtable-generic.c:101
 wp_page_copy mm/memory.c:3635 [inline]
 do_wp_page+0x1683/0x4f20 mm/memory.c:4030
 handle_pte_fault mm/memory.c:6105 [inline]
 __handle_mm_fault+0x2223/0x5490 mm/memory.c:6232
 handle_mm_fault+0x589/0xd10 mm/memory.c:6401
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f5f1deb5db7
Code: 00 00 00 41 55 48 89 d0 49 89 fd 41 54 49 89 f4 53 4c 89 c3 48 83 ec 10 48 39 4f 60 0f 84 c1 00 00 00 42 f6 44 01 08 01 74 59 <48> 83 61 08 fe 48 3d ff 03 00 00 76 69 49 8b 55 70 49 8d 75 60 48
RSP: 002b:00007ffcc63166f0 EFLAGS: 00010202
RAX: 0000000000006010 RBX: 00000000000001f0 RCX: 000055dea6b9bfe0
RDX: 0000000000006010 RSI: 000055dea6b95fd0 RDI: 00007f5f1dff1ac0
RBP: 00007f5f1dff1ac0 R08: 00000000000001f0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055dea6b95fd0
R13: 00007f5f1dff1ac0 R14: 00000000000001f0 R15: 00007f5f1dff1ac0
 </TASK>
----------------
Code disassembly (best guess):
   0:	e8 1a 17 0c 00       	call   0xc171f
   5:	45 85 ed             	test   %r13d,%r13d
   8:	74 46                	je     0x50
   a:	48 8b 14 24          	mov    (%rsp),%rdx
   e:	49 89 d6             	mov    %rdx,%r14
  11:	49 89 d5             	mov    %rdx,%r13
  14:	49 c1 ee 03          	shr    $0x3,%r14
  18:	41 83 e5 07          	and    $0x7,%r13d
  1c:	4d 01 e6             	add    %r12,%r14
  1f:	41 83 c5 03          	add    $0x3,%r13d
  23:	e8 b7 1b 0c 00       	call   0xc1bdf
  28:	f3 90                	pause
* 2a:	41 0f b6 06          	movzbl (%r14),%eax <-- trapping instruction
  2e:	41 38 c5             	cmp    %al,%r13b
  31:	7c 08                	jl     0x3b
  33:	84 c0                	test   %al,%al
  35:	0f 85 6f 05 00 00    	jne    0x5aa
  3b:	8b 43 08             	mov    0x8(%rbx),%eax
  3e:	31 ff                	xor    %edi,%edi