------------[ cut here ]------------
WARNING: CPU: 0 PID: 5856 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall+0x2e4/0x470
Modules linked in:
CPU: 0 UID: 0 PID: 5856 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:rcu_check_gp_start_stall+0x2e4/0x470
Code: ff ff 48 c7 c7 20 74 b0 99 be 04 00 00 00 e8 b3 dc 7c 00 4c 89 f7 b8 01 00 00 00 87 05 15 67 09 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 80 f4 13 8e 74 47 48 c7 c0 60 e6 a3 8f 48 c1 e8
RSP: 0000:ffffc90000007bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a70cfd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e13f480
RBP: ffffc90000007e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3360e84 R12: 0000000000002904
R13: 1ffff11009607772 R14: ffffffff8e13f480 R15: dffffc0000000000
FS:  00007f91b2cccc80(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000565000f59200 CR3: 000000002264e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 rcu_core+0x5fa/0x1770
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 b6 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 5f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 45 5f
RSP: 0000:ffffc9000382f720 EFLAGS: 00000293
RAX: ffffffff81b4665b RBX: 1ffff11026cc80e1 RCX: ffff888029403980
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000382f8a0 R08: ffffffff8fa3b537 R09: 1ffffffff1f476a6
R10: dffffc0000000000 R11: fffffbfff1f476a7 R12: ffff888136640708
R13: dffffc0000000000 R14: ffff88804b03bdc0 R15: 0000000000000001
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 ptep_clear_flush+0x120/0x170
 do_wp_page+0x1bc2/0x5800
 __handle_mm_fault+0x1033/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f91b28c744b
Code: 89 ef 4c 01 e3 e8 5f f5 ff ff eb 05 49 83 65 08 fe 49 8b 46 70 49 8d 56 60 48 8d 3d 72 e5 0e 00 48 39 50 18 0f 85 b8 fc ff ff <48> 89 45 10 48 89 55 18 48 81 fb ff 03 00 00 76 10 48 c7 45 20 00
RSP: 002b:00007ffc6a7802b0 EFLAGS: 00010246
RAX: 0000565000f32640 RBX: 0000000000003070 RCX: 0000565000f5b250
RDX: 00007f91b29f1b00 RSI: 0000565000f31010 RDI: 00007f91b29b59b3
RBP: 0000565000f591f0 R08: 0000000000000000 R09: 82b73ba48aef4eb2
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000001010
R13: 0000565000f5b250 R14: 00007f91b29f1aa0 R15: 0000565000f31910
 </TASK>
