------------[ cut here ]------------
WARNING: CPU: 1 PID: 15874 at kernel/rcu/tree_stall.h:1050 rcu_check_gp_start_stall+0x2e4/0x470
Modules linked in:
CPU: 1 UID: 0 PID: 15874 Comm: syz.3.2367 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 54 b0 99 be 04 00 00 00 e8 03 30 7c 00 4c 89 f7 b8 01 00 00 00 87 05 55 4d 09 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 00 f4 13 8e 74 47 48 c7 c0 60 c0 a3 8f 48 c1 e8
RSP: 0018:ffffc900001e0bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000a02 RCX: ffffffff81a706bd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e13f400
RBP: ffffc900001e0e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3360a84 R12: 0000000000002904
R13: 1ffff11026cc75f2 R14: ffffffff8e13f400 R15: dffffc0000000000
FS:  00007f8aafdf66c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 0000000029f7a000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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+0xd38/0x12d0
Code: 89 ee 83 e6 01 31 ff e8 56 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 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 e5 5e 0b 00 eb e4 44
RSP: 0018:ffffc90007d56d40 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff11009608349 RCX: 0000000000080000
RDX: ffffc90028641000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90007d56ec0 R08: ffffffff8fa38f37 R09: 1ffffffff1f471e6
R10: dffffc0000000000 R11: fffffbfff1f471e7 R12: ffff88804b041a48
R13: dffffc0000000000 R14: ffff88813663b1c0 R15: 0000000000000000
 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+0x764/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:rep_movs_alternative+0x75/0x90
Code: 05 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 c7 48 01 c6 48 29 c1 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 91 c3 cc cc cc cc 48 8d 0c c8 eb 86 cc cc
RSP: 0018:ffffc90007d57638 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff88811b672103 RCX: 0000000000000078
RDX: 0000000000000000 RSI: ffff88811b672983 RDI: 0000200000001000
RBP: ffffc90007d577b0 R08: ffff88811b672d47 R09: 1ffff110236ce5a8
R10: dffffc0000000000 R11: ffffed10236ce5a9 R12: dffffc0000000000
R13: 0000000000000c45 R14: 00007ffffffff000 R15: 00002000000013c5
 _copy_to_iter+0x60a/0x1790
 __skb_datagram_iter+0xf8/0x990
 skb_copy_datagram_iter+0xc5/0x230
 netlink_recvmsg+0x2ab/0xa30
 sock_recvmsg+0x22c/0x270
 ____sys_recvmsg+0x1c9/0x460
 ___sys_recvmsg+0x1b5/0x510
 __x64_sys_recvmsg+0x198/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8aaef8eba9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8aafdf6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f8aaf1d6180 RCX: 00007f8aaef8eba9
RDX: 0000000000014000 RSI: 0000200000000140 RDI: 0000000000000010
RBP: 00007f8aaf011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8aaf1d6218 R14: 00007f8aaf1d6180 R15: 00007ffeed50ef38
 </TASK>
