------------[ cut here ]------------
WARNING: CPU: 1 PID: 10170 at kernel/rcu/tree_stall.h:894 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:886
Modules linked in:
CPU: 1 PID: 10170 Comm: syz-executor.5 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:894
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 a0 55 22 90 e8 2e 39 5a 00 b8 01 00 00 00 87 05 23 a8 c0 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd c0 50 98 8b 48 c7 c3 6c b5 6c 8d 74 58 48 b8 00 00
RSP: 0018:ffffc90000dc0e30 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000100045374 RCX: ffffffff8161ad72
RDX: fffffbfff2044ab4 RSI: 0000000000000004 RDI: ffffffff902255a0
RBP: ffffffff8b9850c0 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff2044ab4 R11: 1ffff110173aa54e R12: 1ffffffff16c1e30
R13: 0000000000000246 R14: ffff8880b9d52992 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 000000004033b000 CR4: 00000000001506e0
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:857 [inline]
 rcu_core+0x4df/0x1380 kernel/rcu/tree.c:2780
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 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:638
RIP: 0010:zap_pte_range mm/memory.c:1325 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1481 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1510 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1531 [inline]
RIP: 0010:unmap_page_range+0xa8b/0x2a10 mm/memory.c:1552
Code: 4c 39 fb 0f 84 a2 0f 00 00 49 89 c7 49 8d 87 00 f0 ff ff 48 89 44 24 08 e8 72 89 cb ff 48 8b 04 24 48 c1 e8 03 42 80 3c 30 00 <0f> 85 04 1a 00 00 48 8b 04 24 31 ff 4c 8b 20 4c 89 e3 48 83 e3 9f
RSP: 0018:ffffc90001ee77b0 EFLAGS: 00000246
RAX: 1ffff11010534100 RBX: 00007f3e46200000 RCX: 0000000000000000
RDX: ffff8880671e54c0 RSI: ffffffff81aa1f7e RDI: 0000000000000003
RBP: ffffea0001921740 R08: 00007f3e46200000 R09: 0000000000000000
R10: ffffffff81aa1f5a R11: 0000000000000000 R12: ffffea0001921770
R13: 0000000000000000 R14: dffffc0000000000 R15: 00007f3e46101000
 unmap_single_vma+0x198/0x300 mm/memory.c:1597
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629
 exit_mmap+0x1d0/0x620 mm/mmap.c:3201
 __mmput+0x122/0x470 kernel/fork.c:1101
 mmput+0x58/0x60 kernel/fork.c:1122
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xae2/0x2a60 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2160 kernel/signal.c:2808
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: Unable to access opcode bytes at RIP 0x4665cf.
RSP: 002b:00007f3e43e8f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000020000680 RSI: 00000000c004743e RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff1136bdef R14: 00007f3e43e8f300 R15: 0000000000022000
----------------
Code disassembly (best guess):
   0:	4c 39 fb             	cmp    %r15,%rbx
   3:	0f 84 a2 0f 00 00    	je     0xfab
   9:	49 89 c7             	mov    %rax,%r15
   c:	49 8d 87 00 f0 ff ff 	lea    -0x1000(%r15),%rax
  13:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  18:	e8 72 89 cb ff       	callq  0xffcb898f
  1d:	48 8b 04 24          	mov    (%rsp),%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1)
* 2a:	0f 85 04 1a 00 00    	jne    0x1a34 <-- trapping instruction
  30:	48 8b 04 24          	mov    (%rsp),%rax
  34:	31 ff                	xor    %edi,%edi
  36:	4c 8b 20             	mov    (%rax),%r12
  39:	4c 89 e3             	mov    %r12,%rbx
  3c:	48 83 e3 9f          	and    $0xffffffffffffff9f,%rbx