[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 31.726251] random: sshd: uninitialized urandom read (32 bytes read) [ 31.965753] audit: type=1400 audit(1537815509.817:6): avc: denied { map } for pid=5467 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 32.025318] random: sshd: uninitialized urandom read (32 bytes read) [ 32.630673] random: sshd: uninitialized urandom read (32 bytes read) [ 32.868904] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. [ 38.614762] random: sshd: uninitialized urandom read (32 bytes read) [ 38.748394] audit: type=1400 audit(1537815516.597:7): avc: denied { map } for pid=5481 comm="syz-executor835" path="/root/syz-executor835413124" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 38.780288] IPVS: ftp: loaded support on port[0] = 21 [ 38.949894] bridge0: port 1(bridge_slave_0) entered blocking state [ 38.956602] bridge0: port 1(bridge_slave_0) entered disabled state [ 38.963667] device bridge_slave_0 entered promiscuous mode [ 38.985213] bridge0: port 2(bridge_slave_1) entered blocking state [ 38.991625] bridge0: port 2(bridge_slave_1) entered disabled state [ 38.999392] device bridge_slave_1 entered promiscuous mode [ 39.017367] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 39.034894] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 39.085415] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 39.106001] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 39.182596] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 39.190329] team0: Port device team_slave_0 added [ 39.207754] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 39.215350] team0: Port device team_slave_1 added [ 39.232184] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 39.255040] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 39.275478] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 39.295956] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 39.441061] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.447544] bridge0: port 2(bridge_slave_1) entered forwarding state [ 39.454390] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.460807] bridge0: port 1(bridge_slave_0) entered forwarding state RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument [ 39.966958] 8021q: adding VLAN 0 to HW filter on device bond0 [ 40.017001] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 40.067970] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 40.074139] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 40.082563] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 40.129105] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 40.417872] audit: type=1400 audit(1537815518.267:8): avc: denied { name_bind } for pid=5482 comm="syz-executor835" src=20000 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:port_t:s0 tclass=dccp_socket permissive=1 [ 40.440883] audit: type=1400 audit(1537815518.267:9): avc: denied { node_bind } for pid=5482 comm="syz-executor835" src=20000 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:node_t:s0 tclass=dccp_socket permissive=1 [ 40.464528] audit: type=1400 audit(1537815518.307:10): avc: denied { name_connect } for pid=5482 comm="syz-executor835" dest=20000 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:port_t:s0 tclass=dccp_socket permissive=1 [ 40.533514] hrtimer: interrupt took 25863 ns [ 40.560588] BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:425/tfrc_rx_hist_sample_rtt() [ 40.573930] CPU: 0 PID: 5729 Comm: syz-executor835 Not tainted 4.19.0-rc5+ #31 [ 40.581277] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.585702] FS-Cache: Duplicate cookie detected [ 40.590628] Call Trace: [ 40.595362] FS-Cache: O-cookie c=000000001e3ebd24 [p=00000000d151a9d2 fl=222 nc=0 na=1] [ 40.597871] [ 40.606093] FS-Cache: O-cookie d=000000005b645e59 n=00000000776bad6d [ 40.608154] dump_stack+0x1c4/0x2b4 [ 40.614652] FS-Cache: O-key=[10] '02 [ 40.618248] ? dump_stack_print_info.cold.2+0x52/0x52 [ 40.618269] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.621964] 00 [ 40.627149] ? tfrc_rx_handle_loss+0x67b/0x1eb0 [ 40.627168] tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c [ 40.627186] ccid3_hc_rx_packet_recv+0x5c4/0xeb0 [ 40.627200] ? dccp_parse_options+0x4a1/0x12f0 [ 40.627217] ? ccid3_hc_tx_send_packet+0x880/0x880 [ 40.627235] dccp_deliver_input_to_ccids+0xf0/0x280 [ 40.632757] 02 [ 40.634557] dccp_rcv_established+0x87/0xb0 [ 40.634574] dccp_v4_do_rcv+0x153/0x180 [ 40.634590] __sk_receive_skb+0x3e5/0xec0 [ 40.634608] ? sk_free+0x50/0x50 [ 40.634633] ? inet_lhash2_lookup+0x6e0/0x6e0 [ 40.634644] ? reqsk_fastopen_remove+0x660/0x660 [ 40.634660] ? lock_downgrade+0x900/0x900 [ 40.634674] ? check_preemption_disabled+0x48/0x200 [ 40.634691] ? dccp_invalid_packet+0x64/0x880 [ 40.634707] dccp_v4_rcv+0x10f9/0x1f58 [ 40.634729] ? dccp_v4_err+0x18a0/0x18a0 [ 40.634749] ? __lock_is_held+0xb5/0x140 [ 40.634775] ip_local_deliver_finish+0x2e9/0xda0 [ 40.634794] ? ip_sublist_rcv_finish+0x3f0/0x3f0 [ 40.634813] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 40.639468] 00 [ 40.644650] ? nf_hook_slow+0x11e/0x1c0 [ 40.644671] ip_local_deliver+0x1e9/0x750 [ 40.644695] ? ip_call_ra_chain+0x730/0x730 [ 40.649431] 00 [ 40.654012] ? ip_sublist_rcv_finish+0x3f0/0x3f0 [ 40.658953] 00 [ 40.663938] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 40.665744] 02 [ 40.670021] ? kasan_check_read+0x11/0x20 [ 40.670040] ? rcu_bh_qs+0xc0/0xc0 [ 40.673998] 00 [ 40.678146] ip_rcv_finish+0x1f9/0x300 [ 40.678164] ip_rcv+0xed/0x610 [ 40.678187] ? ip_local_deliver+0x750/0x750 [ 40.681535] 00 [ 40.686031] ? ip_rcv_finish_core.isra.15+0x1f40/0x1f40 [ 40.686065] ? lock_acquire+0x1ed/0x520 [ 40.686082] ? process_backlog+0x1a6/0x760 [ 40.690824] 00 [ 40.694969] __netif_receive_skb_one_core+0x14d/0x200 [ 40.694986] ? __netif_receive_skb_core+0x3b60/0x3b60 [ 40.695009] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 40.699999] ' [ 40.704489] ? rcu_bh_qs+0xc0/0xc0 [ 40.708407] FS-Cache: N-cookie c=00000000d88e9bbd [p=00000000d151a9d2 fl=2 nc=0 na=1] [ 40.712415] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 40.716485] FS-Cache: N-cookie d=000000005b645e59 n=00000000c2a3eb0a [ 40.721203] __netif_receive_skb+0x2c/0x1e0 [ 40.725968] FS-Cache: N-key=[10] ' [ 40.730946] process_backlog+0x217/0x760 [ 40.732726] 02 [ 40.736701] net_rx_action+0x7c5/0x1950 [ 40.736731] ? napi_complete_done+0x6d0/0x6d0 [ 40.740858] 00 [ 40.745180] ? mark_held_locks+0x130/0x130 [ 40.745198] ? load_new_mm_cr3+0x200/0x200 [ 40.745229] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 40.746999] 02 [ 40.751749] ? graph_lock+0x170/0x170 [ 40.753530] 00 [ 40.759321] ? enqueue_hrtimer+0x1a5/0x560 [ 40.759335] ? graph_lock+0x170/0x170 [ 40.759351] ? do_raw_spin_unlock+0xa7/0x2f0 [ 40.759373] ? flush_tlb_func_common.constprop.16+0x600/0xd10 [ 40.761156] 00 [ 40.765296] ? graph_lock+0x170/0x170 [ 40.765312] ? leave_mm+0x40/0x40 [ 40.765333] ? clockevents_program_event+0x158/0x370 [ 40.768851] 00 [ 40.770648] ? lock_downgrade+0x900/0x900 [ 40.774509] 02 [ 40.777697] ? find_held_lock+0x36/0x1c0 [ 40.777711] ? print_usage_bug+0xc0/0xc0 [ 40.777732] ? tick_nohz_irq_exit+0xa8/0x140 [ 40.777749] ? lock_downgrade+0x900/0x900 [ 40.782060] 00 [ 40.783864] ? graph_lock+0x170/0x170 [ 40.789241] 00 [ 40.793176] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.797415] 00 [ 40.799184] ? check_preemption_disabled+0x48/0x200 [ 40.804349] ' [ 40.809526] ? check_preemption_disabled+0x48/0x200 [ 40.809550] ? __lock_is_held+0xb5/0x140 [ 40.809581] __do_softirq+0x30b/0xad8 [ 40.976199] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.981758] ? __irqentry_text_end+0x1f9618/0x1f9618 [ 40.986871] ? smp_reschedule_interrupt+0x109/0x650 [ 40.991893] ? smp_thermal_interrupt+0x850/0x850 [ 40.996656] ? ret_from_intr+0xb/0x1e [ 41.000464] ? trace_hardirqs_off_caller+0xbb/0x310 [ 41.005488] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.010336] ? trace_hardirqs_on_caller+0x310/0x310 [ 41.015357] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.020897] ? check_preemption_disabled+0x48/0x200 [ 41.025929] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.030779] ? ip_finish_output2+0xa83/0x18d0 [ 41.035288] do_softirq_own_stack+0x2a/0x40 [ 41.039607] [ 41.041853] do_softirq.part.13+0x126/0x160 [ 41.046189] __local_bh_enable_ip+0x21d/0x260 [ 41.050691] ip_finish_output2+0xab6/0x18d0 [ 41.055024] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 41.060836] ? ip_copy_metadata+0xe10/0xe10 [ 41.065174] ? graph_lock+0x170/0x170 [ 41.068985] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.074524] ? check_preemption_disabled+0x48/0x200 [ 41.079543] ? check_preemption_disabled+0x48/0x200 [ 41.084564] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.090113] ? ipv4_mtu+0x37d/0x590 [ 41.093749] ? __lock_is_held+0xb5/0x140 [ 41.097824] ip_finish_output+0x7fd/0xf60 [ 41.101971] ? ip_finish_output+0x7fd/0xf60 [ 41.106294] ? ip_fragment.constprop.49+0x240/0x240 [ 41.111313] ? kasan_check_read+0x11/0x20 [ 41.115468] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 41.120747] ? rcu_bh_qs+0xc0/0xc0 [ 41.124295] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 41.129318] ? nf_hook_slow+0x11e/0x1c0 [ 41.133301] ip_output+0x21d/0x8d0 [ 41.136848] ? ip_mc_output+0x15b0/0x15b0 [ 41.141003] ? ip_fragment.constprop.49+0x240/0x240 [ 41.146026] ? __lock_is_held+0xb5/0x140 [ 41.150114] ip_local_out+0xc5/0x1b0 [ 41.153838] __ip_queue_xmit+0x9af/0x1f30 [ 41.158000] ? ip_build_and_send_pkt+0xc80/0xc80 [ 41.162758] ? __skb_checksum+0x920/0x920 [ 41.166910] ? skb_send_sock+0x50/0x50 [ 41.170798] ? reqsk_fastopen_remove+0x660/0x660 [ 41.175556] ? dccp_insert_option_padding+0xbc/0xe0 [ 41.180588] ip_queue_xmit+0x56/0x70 [ 41.184309] dccp_transmit_skb+0x98c/0x12e0 [ 41.188647] dccp_xmit_packet+0x25e/0x8a0 [ 41.192796] ? kasan_check_write+0x14/0x20 [ 41.197037] ? do_raw_spin_lock+0xc1/0x200 [ 41.201288] ? dccp_send_sync+0x270/0x270 [ 41.205440] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 41.210455] ? ccid3_hc_tx_send_packet+0x358/0x880 [ 41.215396] dccp_write_xmit+0x190/0x1f0 [ 41.219469] dccp_sendmsg+0xdc8/0x1020 [ 41.223372] ? dccp_getsockopt+0xf0/0xf0 [ 41.227444] ? rw_copy_check_uvector+0x310/0x3e0 [ 41.232217] ? sock_has_perm+0x2bc/0x3e0 [ 41.236286] ? selinux_secmark_relabel_packet+0xe0/0xe0 [ 41.241651] ? dup_iter+0x232/0x270 [ 41.245296] inet_sendmsg+0x1a1/0x690 [ 41.249105] ? copy_msghdr_from_user+0x3c1/0x580 [ 41.253864] ? ipip_gro_receive+0x100/0x100 [ 41.258194] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.263735] ? security_socket_sendmsg+0x94/0xc0 [ 41.268493] ? ipip_gro_receive+0x100/0x100 [ 41.272822] sock_sendmsg+0xd5/0x120 [ 41.276542] ___sys_sendmsg+0x7fd/0x930 [ 41.280525] ? copy_msghdr_from_user+0x580/0x580 [ 41.285285] ? kasan_check_write+0x14/0x20 [ 41.289539] ? __fget_light+0x2e9/0x430 [ 41.293520] ? fget_raw+0x20/0x20 [ 41.296985] ? do_dccp_setsockopt.isra.10+0x1fc/0x7b0 [ 41.302181] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 41.307816] ? __kasan_slab_free+0x119/0x150 [ 41.312234] ? do_dccp_setsockopt.isra.10+0x1fc/0x7b0 [ 41.317438] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.322977] ? sockfd_lookup_light+0xc5/0x160 [ 41.327481] __sys_sendmsg+0x11d/0x280 [ 41.331377] ? __ia32_sys_shutdown+0x80/0x80 [ 41.335789] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 41.341324] ? fput+0x130/0x1a0 [ 41.344617] ? __x64_sys_futex+0x47f/0x6a0 [ 41.348860] ? do_syscall_64+0x9a/0x820 [ 41.352838] ? do_syscall_64+0x9a/0x820 [ 41.356826] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 41.362290] __x64_sys_sendmsg+0x78/0xb0 [ 41.366366] do_syscall_64+0x1b9/0x820 [ 41.370259] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 41.375634] ? syscall_return_slowpath+0x5e0/0x5e0 [ 41.380572] ? trace_hardirqs_on_caller+0x310/0x310 [ 41.385615] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 41.390639] ? recalc_sigpending_tsk+0x180/0x180 [ 41.395397] ? kasan_check_write+0x14/0x20 [ 41.399643] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.404500] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.409691] RIP: 0033:0x44c9f9 [ 41.412889] Code: e8 0c ba 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 8b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 41.431790] RSP: 002b:00007fb33968eda8 EFLAGS: 00000287 ORIG_RAX: 000000000000002e [ 41.439506] RAX: ffffffffffffffda RBX: 00000000006e0ca8 RCX: 000000000044c9f9 [ 41.446772] RDX: 0000000004000080 RSI: 00000000200030c0 RDI: 0000000000000006 [ 41.454040] RBP: 00000000006e0ca0 R08: 0000000000000000 R09: 0000000000000000 [ 41.461320] R10: 0000000000000000 R11: 0000000000000287 R12: 00000000006e0cac [ 41.468591] R13: 6aa12032941571b4 R14: 00676e697279656b R15: 00000000006e0d8c