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: 14241 Comm: syz-executor.0 Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
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+0x3db/0x4a0 net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x844/0xf10 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+0x169/0x1a0 net/dccp/ipv4.c:680
 sk_backlog_rcv include/net/sock.h:1121 [inline]
 __sk_receive_skb+0x2a8/0xba0 net/core/sock.c:571
 dccp_v4_rcv+0x1282/0x1a00 net/dccp/ipv4.c:903
 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:304 [inline]
 NF_HOOK include/linux/netfilter.h:298 [inline]
 ip_local_deliver+0x1b6/0x550 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:468 [inline]
 ip_rcv_finish+0x1c4/0x2e0 net/ipv4/ip_input.c:449
 NF_HOOK include/linux/netfilter.h:304 [inline]
 NF_HOOK include/linux/netfilter.h:298 [inline]
 ip_rcv+0xc9/0x430 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5523
 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5637
 process_backlog+0x101/0x6b0 net/core/dev.c:5965
 __napi_poll.constprop.0+0xb4/0x530 net/core/dev.c:6527
 napi_poll net/core/dev.c:6594 [inline]
 net_rx_action+0x956/0xe90 net/core/dev.c:6727
 __do_softirq+0x218/0x965 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+0x93/0xc0 arch/x86/kernel/apic/apic.c:1074
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:207
Code: 0f 1e fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 65 8b 05 ad f7 7c 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 bd 03 00 a9
RSP: 0018:ffffc900207d6f08 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffffffff81b7fc11
RDX: ffff88802e8c8800 RSI: 0000000000000000 RDI: 0000000000000007
RBP: ffffea00046c8840 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff920040fadef R15: dffffc0000000000
 arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
 page_fixed_fake_head include/linux/page-flags.h:210 [inline]
 page_is_fake_head include/linux/page-flags.h:242 [inline]
 PageTail include/linux/page-flags.h:286 [inline]
 folio_flags+0x4f/0x1f0 include/linux/page-flags.h:313
 folio_test_active include/linux/page-flags.h:477 [inline]
 folio_add_lru+0x20/0x7d0 mm/swap.c:505
 filemap_add_folio+0x13b/0x1e0 mm/filemap.c:954
 __filemap_get_folio+0x4cf/0xbc0 mm/filemap.c:1944
 ext4_da_write_begin+0x3c7/0x8c0 fs/ext4/inode.c:2881
 generic_perform_write+0x278/0x600 mm/filemap.c:3942
 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299
 ext4_file_write_iter+0x7f7/0x1860 fs/ext4/file.c:717
 __kernel_write_iter+0x261/0x7e0 fs/read_write.c:517
 dump_emit_page fs/coredump.c:888 [inline]
 dump_user_range+0x299/0x790 fs/coredump.c:915
 elf_core_dump+0x2700/0x3900 fs/binfmt_elf.c:2142
 do_coredump+0x2c96/0x3fc0 fs/coredump.c:764
 get_signal+0x2434/0x2790 kernel/signal.c:2878
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:309
 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564
RIP: 0033:0x7f4befc7caf1
Code: c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000000020000800 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f4befd9c050 RCX: 00007f4befc7cae9
RDX: 0000000020000540 RSI: 0000000020000800 RDI: 0000000010000000
RBP: 00007f4befcc847a R08: 0000000020000880 R09: 0000000020000880
R10: 0000000020000840 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000006e R14: 00007f4befd9c050 R15: 00007ffcf238fa98
 </TASK>
----------------
Code disassembly (best guess):
   0:	0f 1e fa             	nop    %edx
   3:	48 8b be b0 01 00 00 	mov    0x1b0(%rsi),%rdi
   a:	e8 b0 ff ff ff       	call   0xffffffbf
   f:	31 c0                	xor    %eax,%eax
  11:	c3                   	ret
  12:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  19:	00 00 00 00
  1d:	66 90                	xchg   %ax,%ax
  1f:	f3 0f 1e fa          	endbr64
  23:	65 8b 05 ad f7 7c 7e 	mov    %gs:0x7e7cf7ad(%rip),%eax        # 0x7e7cf7d7
* 2a:	89 c1                	mov    %eax,%ecx <-- trapping instruction
  2c:	48 8b 34 24          	mov    (%rsp),%rsi
  30:	81 e1 00 01 00 00    	and    $0x100,%ecx
  36:	65 48 8b 14 25 00 bd 	mov    %gs:0x3bd00,%rdx
  3d:	03 00
  3f:	a9                   	.byte 0xa9