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: 24794 Comm: syz-executor.5 Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 tfrc_rx_hist_sample_rtt+0x4a5/0x4b0 net/dccp/ccids/lib/packet_history.c:414 ccid3_hc_rx_packet_recv+0x5b8/0xe90 net/dccp/ccids/ccid3.c:760 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xd9/0x250 net/dccp/input.c:176 dccp_rcv_established net/dccp/input.c:374 [inline] dccp_rcv_established+0x107/0x160 net/dccp/input.c:364 dccp_v4_do_rcv+0x130/0x190 net/dccp/ipv4.c:667 sk_backlog_rcv include/net/sock.h:1023 [inline] __sk_receive_skb+0x29d/0x830 net/core/sock.c:527 dccp_v4_rcv+0xea5/0x19d0 net/dccp/ipv4.c:890 ip_protocol_deliver_rcu+0xa7/0xa20 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x20a/0x370 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip_local_deliver+0x1b3/0x200 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:458 [inline] ip_rcv_finish+0x1da/0x2f0 net/ipv4/ip_input.c:429 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip_rcv+0xaa/0xd0 net/ipv4/ip_input.c:540 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5498 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5612 process_backlog+0x2a5/0x6c0 net/core/dev.c:6492 __napi_poll+0xaf/0x440 net/core/dev.c:7047 napi_poll net/core/dev.c:7114 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7201 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5593 Code: dc a6 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc9000b41f548 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff92001683eab RCX: ffffffff815acabf RDX: 1ffff1100e30a4c5 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8fcd38b7 R10: fffffbfff1f9a716 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8bababc0 R15: 0000000000000000 fs_reclaim_acquire mm/page_alloc.c:4572 [inline] fs_reclaim_acquire+0xd2/0x160 mm/page_alloc.c:4563 might_alloc include/linux/sched/mm.h:198 [inline] slab_pre_alloc_hook mm/slab.h:492 [inline] slab_alloc_node mm/slub.c:2877 [inline] kmem_cache_alloc_node+0x45/0x3e0 mm/slub.c:2992 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1112 [inline] alloc_skb_with_frags+0x93/0x620 net/core/skbuff.c:6019 sock_alloc_send_pskb+0x783/0x910 net/core/sock.c:2461 dccp_sendmsg+0x2c9/0xc90 net/dccp/proto.c:768 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x331/0x810 net/socket.c:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmmsg+0x195/0x470 net/socket.c:2532 __do_sys_sendmmsg net/socket.c:2561 [inline] __se_sys_sendmmsg net/socket.c:2558 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2558 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3689387188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000503 RSI: 0000000020000ac0 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffc2322f96f R14: 00007f3689387300 R15: 0000000000022000