bisecting fixing commit since 1d966eb4d6326a2521073174e9710713e9846e8b building syzkaller on 56cc113a8ea223321811dcbe8de975e081f5f5b2 testing commit 1d966eb4d6326a2521073174e9710713e9846e8b with gcc (GCC) 8.1.0 kernel signature: 9fc7f6d4b14440c25c707c36d8c6b36e2f6877b49943d3a06483d56a2f635c69 all runs: crashed: BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:LINE/tfrc_rx_his testing current HEAD 359c92c02bfae1a6f1e8e37c298e518fd256642c testing commit 359c92c02bfae1a6f1e8e37c298e518fd256642c with gcc (GCC) 8.1.0 kernel signature: 4979dac4ce3d6a01d7f55db2db8da3f78683cf078c378dff4db59211ea27ec61 all runs: crashed: BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:LINE/tfrc_rx_his revisions tested: 2, total time: 14m56.95496711s (build: 8m12.337198909s, test: 6m0.117685729s) the crash still happens on HEAD commit msg: Merge tag 'dax-fixes-5.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm crash: BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:LINE/tfrc_rx_his can: request_module (can-proto-0) failed. tipc: TX() has been purged, node left! dccp_close: ABORT with 24 bytes unread BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() CPU: 1 PID: 4785 Comm: syz-executor3 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdb7c106c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fdb7c1076d4 R15: 0000000000000002 CPU: 0 PID: 4798 Comm: syz-executor2 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 dccp_close: ABORT with 24 bytes unread __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd3650e3c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071c010 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fd3650e46d4 R15: 0000000000000004 CPU: 1 PID: 4820 Comm: syz-executor1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_close: ABORT with 24 bytes unread dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 dccp_close: ABORT with 24 bytes unread sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_close: ABORT with 24 bytes unread dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 dccp_close: ABORT with 24 bytes unread __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcad18d4c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fcad18d56d4 R15: 0000000000000002 CPU: 0 PID: 4843 Comm: syz-executor5 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 dccp_close: ABORT with 24 bytes unread tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 dccp_close: ABORT with 24 bytes unread ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dccp_close: ABORT with 24 bytes unread dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 dccp_close: ABORT with 24 bytes unread __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe724ceac58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fe724ceb6d4 R15: 0000000000000001 CPU: 1 PID: 4862 Comm: syz-executor1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcad18d4c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fcad18d56d4 R15: 0000000000000002 CPU: 0 PID: 4882 Comm: syz-executor5 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe724ceac58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fe724ceb6d4 R15: 0000000000000002 CPU: 1 PID: 4885 Comm: syz-executor Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f455bb32c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007f455bb336d4 R15: 0000000000000002 CPU: 0 PID: 4894 Comm: syz-executor3 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdb7c106c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fdb7c1076d4 R15: 0000000000000002 CPU: 1 PID: 4910 Comm: syz-executor5 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe724ceac58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fe724ceb6d4 R15: 0000000000000002 CPU: 0 PID: 4914 Comm: syz-executor1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcad18b3c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071c010 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fcad18b46d4 R15: 0000000000000008 net_ratelimit: 12 callbacks suppressed dccp_close: ABORT with 24 bytes unread dccp_close: ABORT with 393 bytes unread dccp_close: ABORT with 24 bytes unread dccp_close: ABORT with 24 bytes unread dccp_close: ABORT with 24 bytes unread dccp_close: ABORT with 24 bytes unread dccp_close: ABORT with 24 bytes unread dccp_close: ABORT with 24 bytes unread BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() CPU: 1 PID: 4933 Comm: syz-executor2 Not tainted 5.6.0-rc1-syzkaller #0 dccp_close: ABORT with 24 bytes unread Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd365104c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fd3651056d4 R15: 0000000000000002 CPU: 0 PID: 4939 Comm: syz-executor3 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 dccp_close: ABORT with 24 bytes unread Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdb7c106c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fdb7c1076d4 R15: 0000000000000002 CPU: 1 PID: 4965 Comm: syz-executor1 Not tainted 5.6.0-rc1-syzkaller #0 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcad18d4c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fcad18d56d4 R15: 0000000000000002 CPU: 0 PID: 4966 Comm: syz-executor4 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6311082c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007f63110836d4 R15: 0000000000000002 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() CPU: 0 PID: 4980 Comm: syz-executor Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f455bb32c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007f455bb336d4 R15: 0000000000000002 CPU: 1 PID: 5001 Comm: syz-executor1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcad18d4c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fcad18d56d4 R15: 0000000000000002 CPU: 0 PID: 5010 Comm: syz-executor2 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd365104c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fd3651056d4 R15: 0000000000000002 CPU: 1 PID: 5034 Comm: syz-executor1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcad18d4c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007fcad18d56d4 R15: 0000000000000002 CPU: 0 PID: 5038 Comm: syz-executor Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 tfrc_rx_hist_sample_rtt.cold.3+0x47/0x4c net/dccp/ccids/lib/packet_history.c:409 ccid3_hc_rx_packet_recv+0x471/0xec0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xcc/0x220 net/dccp/input.c:176 dccp_rcv_established+0x49/0x70 net/dccp/input.c:374 dccp_v4_do_rcv+0xf4/0x160 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:938 [inline] __sk_receive_skb+0x2b6/0x9e0 net/core/sock.c:519 dccp_v4_rcv+0xc22/0x1c0b net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x50b/0x6b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1ee/0x2e0 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x306/0x450 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0xb0/0x170 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0xcb/0x2f0 net/ipv4/ip_input.c:538 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() __netif_receive_skb_one_core+0x132/0x190 net/core/dev.c:5198 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5312 process_backlog+0x1f1/0x700 net/core/dev.c:6144 napi_poll net/core/dev.c:6582 [inline] net_rx_action+0x42d/0xde0 net/core/dev.c:6650 __do_softirq+0x248/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.17+0x11a/0x150 kernel/softirq.c:337 do_softirq arch/x86/include/asm/preempt.h:26 [inline] __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline] ip_finish_output2+0x72d/0x22a0 net/ipv4/ip_output.c:229 __ip_finish_output+0x401/0xa80 net/ipv4/ip_output.c:306 ip_finish_output+0x27/0x170 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_output+0x1c6/0x560 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:436 [inline] ip_local_out+0x7e/0x130 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x700/0x1de0 net/ipv4/ip_output.c:530 ip_queue_xmit+0x45/0x70 include/net/ip.h:237 dccp_transmit_skb+0xb76/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1a0/0x580 net/dccp/output.c:277 dccp_write_xmit+0x128/0x180 net/dccp/output.c:359 dccp_sendmsg+0x68f/0xdb0 net/dccp/proto.c:812 inet_sendmsg+0xbd/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xdf/0x110 net/socket.c:672 ____sys_sendmsg+0x687/0xae0 net/socket.c:2343 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397 __sys_sendmsg+0xd9/0x180 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2437 do_syscall_64+0xd0/0x600 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x452f89 Code: e8 ac b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 2b ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f455bb32c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f89 RDX: 0000000000000080 RSI: 00000000206c8000 RDI: 0000000000000005 RBP: 000000000000048a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d90 R13: 00000000ffffffff R14: 00007f455bb336d4 R15: 0000000000000002 CPU: 1 PID: 5054 Comm: syz-executor4 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:412/tfrc_rx_hist_sample_rtt() Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118