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 UID: 0 PID: 22627 Comm: syz.3.6586 Not tainted 6.11.0-rc5-syzkaller-00079-g928f79a188aa #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:119
 tfrc_rx_hist_sample_rtt+0x3e1/0x4a0 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+0xe3/0x270 net/dccp/input.c:176
 dccp_rcv_established net/dccp/input.c:374 [inline]
 dccp_rcv_established+0x10a/0x160 net/dccp/input.c:364
 dccp_v4_do_rcv+0x171/0x1b0 net/dccp/ipv4.c:680
 sk_backlog_rcv include/net/sock.h:1111 [inline]
 __sk_receive_skb+0x7aa/0x890 net/core/sock.c:569
 dccp_v4_rcv+0x1153/0x1d30 net/dccp/ipv4.c:903
 ip_protocol_deliver_rcu+0x441/0x4c0 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x316/0x570 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:460 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:449 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_rcv+0x2c5/0x5d0 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5661
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5775
 process_backlog+0x443/0x15f0 net/core/dev.c:6108
 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6772
 napi_poll net/core/dev.c:6841 [inline]
 net_rx_action+0xa92/0x1010 net/core/dev.c:6963
 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xc/0x70 kernel/kcov.c:216
Code: c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 15 54 c1 78 7e <65> 8b 05 55 c1 78 7e a9 00 01 ff 00 48 8b 34 24 74 1d f6 c4 01 74
RSP: 0000:ffffc9000cc4faf8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffea000122abc0 RCX: ffffffff81be7c02
RDX: ffff88801a64c880 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc9000cc4fc30 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000015f
R13: 000000000122ab01 R14: dffffc0000000000 R15: 1ffff92001989f89
 next_uptodate_folio+0x110/0x4b0 mm/filemap.c:3479
 filemap_map_pages+0x5d8/0x1440 mm/filemap.c:3653
 do_fault_around mm/memory.c:5019 [inline]
 do_read_fault mm/memory.c:5052 [inline]
 do_fault mm/memory.c:5191 [inline]
 do_pte_missing mm/memory.c:3947 [inline]
 handle_pte_fault mm/memory.c:5521 [inline]
 __handle_mm_fault+0x390f/0x5350 mm/memory.c:5664
 handle_mm_fault+0x44e/0x7b0 mm/memory.c:5832
 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0023:0xf715650b
Code: 24 14 83 e9 01 c1 e1 0e 89 f0 89 fa 0f ac fe 03 0f ac d0 06 8d 14 0b 89 f1 25 ff 3f 00 00 83 e1 07 01 d0 ba 01 00 00 00 d3 e2 <84> 90 20 20 00 00 0f 85 61 fd ff ff e9 02 fe ff ff e8 cf 5d fe ff
RSP: 002b:00000000ffea61f0 EFLAGS: 00010202
RAX: 000000000c37f842 RBX: 000000000c230000 RCX: 0000000000000005
RDX: 0000000000000020 RSI: 00000000f11fc215 RDI: 00000000ffffffff
RBP: 00000000f7f65610 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
dccp_check_seqno: Step 6 failed for CLOSEREQ packet, (LSWL(80149854887317) <= P.seqno(80149854887316) <= S.SWH(80149854887391)) and (P.ackno exists or LAWL(118418402354475) <= P.ackno(118418402354475) <= S.AWH(118418402354475), sending SYNC...
----------------
Code disassembly (best guess):
   0:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
   c:	00 00
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	f3 0f 1e fa          	endbr64
  22:	65 48 8b 15 54 c1 78 	mov    %gs:0x7e78c154(%rip),%rdx        # 0x7e78c17e
  29:	7e
* 2a:	65 8b 05 55 c1 78 7e 	mov    %gs:0x7e78c155(%rip),%eax        # 0x7e78c186 <-- trapping instruction
  31:	a9 00 01 ff 00       	test   $0xff0100,%eax
  36:	48 8b 34 24          	mov    (%rsp),%rsi
  3a:	74 1d                	je     0x59
  3c:	f6 c4 01             	test   $0x1,%ah
  3f:	74                   	.byte 0x74