BUG: please report to dccp@vger.kernel.org => prev = 5, last = 5 at net/dccp/ccids/lib/packet_history.c:417/tfrc_rx_hist_sample_rtt()
CPU: 1 PID: 13959 Comm: kworker/u4:21 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: bat_events batadv_nc_worker
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 dump_stack+0x1c/0x28 lib/dump_stack.c:113
 tfrc_rx_hist_sample_rtt+0x34c/0x444 net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x554/0xc98 net/dccp/ccids/ccid3.c:760
 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline]
 dccp_deliver_input_to_ccids net/dccp/input.c:176 [inline]
 dccp_rcv_established+0x1ac/0x2d8 net/dccp/input.c:374
 dccp_v4_do_rcv+0xe8/0x1d4 net/dccp/ipv4.c:675
 sk_backlog_rcv include/net/sock.h:1092 [inline]
 __sk_receive_skb+0x3e4/0x8ec net/core/sock.c:568
 dccp_v4_rcv+0xf5c/0x14e8 net/dccp/ipv4.c:898
 ip_protocol_deliver_rcu+0x1f8/0x47c net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x23c/0x46c net/ipv4/ip_input.c:233
 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314
 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:461 [inline]
 ip_rcv_finish+0x220/0x24c net/ipv4/ip_input.c:449
 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314
 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core net/core/dev.c:5534 [inline]
 __netif_receive_skb+0x18c/0x400 net/core/dev.c:5648
 process_backlog+0x3c0/0x70c net/core/dev.c:5976
 __napi_poll+0xb4/0x654 net/core/dev.c:6576
 napi_poll net/core/dev.c:6645 [inline]
 net_rx_action+0x5e4/0xdc4 net/core/dev.c:6778
 __do_softirq+0x2d8/0xce4 kernel/softirq.c:553
 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81
 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889
 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86
 invoke_softirq kernel/softirq.c:434 [inline]
 __irq_exit_rcu+0x1d8/0x434 kernel/softirq.c:632
 irq_exit_rcu+0x14/0x84 kernel/softirq.c:644
 __el1_irq arch/arm64/kernel/entry-common.c:537 [inline]
 el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:551
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:556
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:594
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:27 [inline]
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:49 [inline]
 __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:386
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 batadv_nc_purge_paths+0x2f4/0x378 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x314/0x580 net/batman-adv/network-coding.c:722
 process_one_work+0x694/0x1204 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2706 [inline]
 worker_thread+0x938/0xef4 kernel/workqueue.c:2787
 kthread+0x288/0x310 kernel/kthread.c:388
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
ccid3_first_li: No RTT estimate available, using fallback RTT