BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:414/tfrc_rx_hist_sample_rtt()
CPU: 0 PID: 30751 Comm: syz-executor.0 Not tainted 6.8.0-rc1-syzkaller-00286-g168174d78157 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 tfrc_rx_hist_sample_rtt+0x3dd/0x4a0 net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x443/0xf50 net/dccp/ccids/ccid3.c:760
 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline]
 dccp_deliver_input_to_ccids+0xe3/0x260 net/dccp/input.c:176
 dccp_rcv_established net/dccp/input.c:374 [inline]
 dccp_rcv_established+0x106/0x160 net/dccp/input.c:364
 dccp_v4_do_rcv+0x169/0x1b0 net/dccp/ipv4.c:675
 sk_backlog_rcv include/net/sock.h:1092 [inline]
 __sk_receive_skb+0x2af/0x840 net/core/sock.c:568
 dccp_v4_rcv+0x1281/0x1980 net/dccp/ipv4.c:898
 ip_protocol_deliver_rcu+0x9f/0x480 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2e4/0x510 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:461 [inline]
 ip_rcv_finish+0x1b8/0x2e0 net/ipv4/ip_input.c:449
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_rcv+0xaf/0xd0 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5534
 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5648
 process_backlog+0x101/0x6b0 net/core/dev.c:5976
 __napi_poll.constprop.0+0xb4/0x540 net/core/dev.c:6576
 napi_poll net/core/dev.c:6645 [inline]
 net_rx_action+0x956/0xe90 net/core/dev.c:6778
 __do_softirq+0x21a/0x8de kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:_compound_head include/linux/page-flags.h:249 [inline]
RIP: 0010:PageSlab include/linux/page-flags.h:481 [inline]
RIP: 0010:page_table_check_clear.part.0+0x58/0x7f0 mm/page_table_check.c:74
Code: 48 89 df e8 fa f3 ff ff 4c 89 ea 49 89 c4 48 c1 ea 03 48 b8 00 00 00 00 00 fc ff df 80 3c 02 00 0f 85 f3 06 00 00 48 8b 6b 08 <31> ff 49 89 ef 41 83 e7 01 4c 89 fe e8 67 8a 9d ff 4d 85 ff 0f 85
RSP: 0018:ffffc900031275f8 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffea0000dbbcc0 RCX: ffffffff81ea8a14
RDX: 1ffffd40001b7799 RSI: ffffffff81ea8a30 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: ffff888014e2abf0
R13: ffffea0000dbbcc8 R14: 0000000000000001 R15: 8000000036ef3007
 page_table_check_clear mm/page_table_check.c:68 [inline]
 __page_table_check_pte_clear+0x2e3/0x5a0 mm/page_table_check.c:158
 page_table_check_pte_clear include/linux/page_table_check.h:49 [inline]
 ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1302 [inline]
 zap_pte_range mm/memory.c:1452 [inline]
 zap_pmd_range mm/memory.c:1597 [inline]
 zap_pud_range mm/memory.c:1626 [inline]
 zap_p4d_range mm/memory.c:1647 [inline]
 unmap_page_range+0x1800/0x2b00 mm/memory.c:1668
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1714
 unmap_vmas+0x22f/0x490 mm/memory.c:1758
 exit_mmap+0x1c1/0xb50 mm/mmap.c:3277
 __mmput+0x12a/0x4d0 kernel/fork.c:1343
 mmput+0x62/0x70 kernel/fork.c:1365
 exit_mm kernel/exit.c:569 [inline]
 do_exit+0x9a5/0x2ad0 kernel/exit.c:858
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020
 get_signal+0x23b5/0x2790 kernel/signal.c:2893
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212
 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f639cc7cda9
Code: Unable to access opcode bytes at 0x7f639cc7cd7f.
RSP: 002b:00007f639da320c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffe00 RBX: 00007f639cdabf80 RCX: 00007f639cc7cda9
RDX: 000000000000001c RSI: 0000000020002640 RDI: 0000000000000003
RBP: 00007f639ccc947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f639cdabf80 R15: 00007ffd33e4b5e8
 </TASK>
ccid3_first_li: No RTT estimate available, using fallback RTT
----------------
Code disassembly (best guess):
   0:	48 89 df             	mov    %rbx,%rdi
   3:	e8 fa f3 ff ff       	call   0xfffff402
   8:	4c 89 ea             	mov    %r13,%rdx
   b:	49 89 c4             	mov    %rax,%r12
   e:	48 c1 ea 03          	shr    $0x3,%rdx
  12:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  19:	fc ff df
  1c:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  20:	0f 85 f3 06 00 00    	jne    0x719
  26:	48 8b 6b 08          	mov    0x8(%rbx),%rbp
* 2a:	31 ff                	xor    %edi,%edi <-- trapping instruction
  2c:	49 89 ef             	mov    %rbp,%r15
  2f:	41 83 e7 01          	and    $0x1,%r15d
  33:	4c 89 fe             	mov    %r15,%rsi
  36:	e8 67 8a 9d ff       	call   0xff9d8aa2
  3b:	4d 85 ff             	test   %r15,%r15
  3e:	0f                   	.byte 0xf
  3f:	85                   	.byte 0x85