[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 28.782439] kauditd_printk_skb: 7 callbacks suppressed [ 28.782451] audit: type=1800 audit(1544833395.919:29): pid=5867 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 28.815250] audit: type=1800 audit(1544833395.929:30): pid=5867 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 640.374314] hrtimer: interrupt took 26232 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 644.864498] ================================================================== [ 644.872052] BUG: KASAN: use-after-free in ccid_hc_tx_delete+0xe0/0x100 [ 644.878707] Read of size 8 at addr ffff8881bfbf3880 by task swapper/1/0 [ 644.885436] [ 644.887051] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.20.0-rc6+ #373 [ 644.893702] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 644.903079] Call Trace: [ 644.905668] [ 644.907864] dump_stack+0x244/0x39d [ 644.911485] ? dump_stack_print_info.cold.1+0x20/0x20 [ 644.916683] ? printk+0xa7/0xcf [ 644.919969] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 644.924736] print_address_description.cold.7+0x9/0x1ff [ 644.930088] kasan_report.cold.8+0x242/0x309 [ 644.934529] ? ccid_hc_tx_delete+0xe0/0x100 [ 644.938852] __asan_report_load8_noabort+0x14/0x20 [ 644.943767] ccid_hc_tx_delete+0xe0/0x100 [ 644.947988] ? dccp_init_sock+0x4a0/0x4a0 [ 644.952212] dccp_sk_destruct+0x3c/0x80 [ 644.956203] __sk_destruct+0x107/0xa80 [ 644.960096] ? sock_no_getname+0x10/0x10 [ 644.964173] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 644.969269] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 644.974395] ? lockdep_hardirqs_on+0x296/0x5b0 [ 644.979007] ? trace_hardirqs_on+0xbd/0x310 [ 644.983337] ? kasan_check_read+0x11/0x20 [ 644.987539] ? debug_object_deactivate+0x2eb/0x450 [ 644.992463] ? lock_acquire+0x1ed/0x520 [ 644.996494] ? rcu_process_callbacks+0x1103/0x1ac0 [ 645.001416] ? lock_release+0xa00/0xa00 [ 645.005378] ? debug_stats_show+0x100/0x100 [ 645.009687] ? __do_softirq+0x308/0xb7e [ 645.013646] ? trace_hardirqs_off_caller+0x310/0x310 [ 645.018782] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.024319] ? check_preemption_disabled+0x48/0x280 [ 645.029330] ? sock_no_getname+0x10/0x10 [ 645.033376] rcu_process_callbacks+0x100a/0x1ac0 [ 645.038117] ? rcu_note_context_switch+0x2150/0x2150 [ 645.043218] ? find_held_lock+0x36/0x1c0 [ 645.047316] ? rebalance_domains+0x358/0xdc0 [ 645.051714] ? lock_downgrade+0x900/0x900 [ 645.055849] ? check_preemption_disabled+0x48/0x280 [ 645.060849] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 645.065763] ? kasan_check_read+0x11/0x20 [ 645.069930] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 645.075212] ? rcu_softirq_qs+0x20/0x20 [ 645.079176] ? rebalance_domains+0x375/0xdc0 [ 645.083593] ? load_balance+0x39a0/0x39a0 [ 645.087749] ? enqueue_hrtimer+0x1a5/0x560 [ 645.091984] ? hrtimer_update_softirq_timer+0xa0/0xa0 [ 645.097160] ? find_held_lock+0x36/0x1c0 [ 645.101215] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.106739] ? check_preemption_disabled+0x48/0x280 [ 645.111741] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.117265] ? check_preemption_disabled+0x48/0x280 [ 645.122273] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 645.127796] ? rcu_pm_notify+0xc0/0xc0 [ 645.131706] __do_softirq+0x308/0xb7e [ 645.135515] ? ktime_get_raw_ts64+0x4d0/0x4d0 [ 645.139998] ? lock_downgrade+0x900/0x900 [ 645.144133] ? __irqentry_text_end+0x1f9658/0x1f9658 [ 645.149256] ? pvclock_read_flags+0x160/0x160 [ 645.153790] ? lapic_next_event+0x5a/0x90 [ 645.157930] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.163458] ? kvm_clock_read+0x18/0x30 [ 645.167437] ? kvm_sched_clock_read+0x9/0x20 [ 645.171854] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.177378] ? check_preemption_disabled+0x48/0x280 [ 645.182405] irq_exit+0x17f/0x1c0 [ 645.185847] smp_apic_timer_interrupt+0x1cb/0x760 [ 645.190846] ? smp_reschedule_interrupt+0x109/0x650 [ 645.195850] ? smp_call_function_single_interrupt+0x650/0x650 [ 645.201719] ? interrupt_entry+0xb5/0xc0 [ 645.205765] ? trace_hardirqs_off_caller+0xbb/0x310 [ 645.210781] ? trace_hardirqs_off_caller+0xbb/0x310 [ 645.215799] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 645.220631] ? trace_hardirqs_on_caller+0x310/0x310 [ 645.225635] ? trace_hardirqs_on_caller+0x310/0x310 [ 645.230684] ? task_prio+0x50/0x50 [ 645.234217] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 645.239742] ? check_preemption_disabled+0x48/0x280 [ 645.244748] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 645.249586] apic_timer_interrupt+0xf/0x20 [ 645.253902] [ 645.256159] RIP: 0010:native_safe_halt+0x6/0x10 [ 645.260816] Code: e9 2c ff ff ff 48 89 c7 48 89 45 d8 e8 f3 c0 e7 f9 48 8b 45 d8 e9 ca fe ff ff 48 89 df e8 e2 c0 e7 f9 eb 82 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 [ 645.279720] RSP: 0018:ffff8881d9b27cb8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 645.287411] RAX: dffffc0000000000 RBX: 1ffff1103b364f9b RCX: 0000000000000000 [ 645.294664] RDX: 1ffffffff12a4021 RSI: 0000000000000001 RDI: ffffffff89520108 [ 645.301914] RBP: ffff8881d9b27cb8 R08: ffff8881d9b14340 R09: 0000000000000000 [ 645.309165] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d9b27d78 [ 645.316431] R13: ffffffff8a1641a0 R14: 0000000000000000 R15: 0000000000000001 [ 645.323706] default_idle+0xbf/0x490 [ 645.327412] ? rcu_dynticks_eqs_enter+0x4f/0x80 [ 645.332254] ? __sched_text_end+0x1/0x1 [ 645.336222] ? rcu_idle_enter+0x39a/0x530 [ 645.340353] ? rcu_eqs_special_set+0x1c0/0x1c0 [ 645.344932] ? tsc_verify_tsc_adjust+0x137/0x450 [ 645.349678] ? trace_hardirqs_off_caller+0x310/0x310 [ 645.354767] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.360292] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.365829] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.371391] arch_cpu_idle+0x10/0x20 [ 645.375109] default_idle_call+0x6d/0x90 [ 645.379172] do_idle+0x49b/0x5c0 [ 645.382531] ? arch_cpu_idle_exit+0x70/0x70 [ 645.386836] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 645.391923] ? complete+0x62/0x80 [ 645.395386] cpu_startup_entry+0x18/0x20 [ 645.399443] start_secondary+0x487/0x5f0 [ 645.403490] ? set_cpu_sibling_map+0x1890/0x1890 [ 645.408235] secondary_startup_64+0xa4/0xb0 [ 645.412560] [ 645.414248] Allocated by task 6320: [ 645.417865] save_stack+0x43/0xd0 [ 645.421301] kasan_kmalloc+0xc7/0xe0 [ 645.425001] kasan_slab_alloc+0x12/0x20 [ 645.428979] kmem_cache_alloc+0x12e/0x730 [ 645.433123] ccid_new+0x25b/0x3e0 [ 645.436559] dccp_hdlr_ccid+0x27/0x150 [ 645.440444] __dccp_feat_activate+0x188/0x280 [ 645.444961] dccp_feat_activate_values+0x3c1/0x80a [ 645.449873] dccp_rcv_state_process+0x1320/0x1b7e [ 645.454769] dccp_v6_do_rcv+0x271/0xbf0 [ 645.458734] __release_sock+0x12f/0x3a0 [ 645.462689] release_sock+0xad/0x2c0 [ 645.466426] __inet_stream_connect+0x641/0x1150 [ 645.471097] inet_stream_connect+0x58/0xa0 [ 645.475357] __sys_connect+0x37d/0x4c0 [ 645.479234] __x64_sys_connect+0x73/0xb0 [ 645.483297] do_syscall_64+0x1b9/0x820 [ 645.487168] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 645.492348] [ 645.493965] Freed by task 6323: [ 645.497237] save_stack+0x43/0xd0 [ 645.500677] __kasan_slab_free+0x102/0x150 [ 645.504898] kasan_slab_free+0xe/0x10 [ 645.508697] kmem_cache_free+0x83/0x290 [ 645.512657] ccid_hc_tx_delete+0xc3/0x100 [ 645.516798] dccp_hdlr_ccid+0x7d/0x150 [ 645.520670] __dccp_feat_activate+0x188/0x280 [ 645.525150] dccp_feat_activate_values+0x3c1/0x80a [ 645.530079] dccp_create_openreq_child+0x47a/0x630 [ 645.534997] dccp_v6_request_recv_sock+0x278/0x2020 [ 645.539999] dccp_check_req+0x47d/0x6d0 [ 645.543977] dccp_v6_rcv+0x874/0x1ce9 [ 645.547811] ip6_input_finish+0x3fc/0x1aa0 [ 645.552032] ip6_input+0xe9/0x600 [ 645.555472] ip6_rcv_finish+0x17a/0x330 [ 645.559431] ipv6_rcv+0x115/0x640 [ 645.562925] __netif_receive_skb_one_core+0x14d/0x200 [ 645.568111] __netif_receive_skb+0x2c/0x1e0 [ 645.572413] process_backlog+0x24e/0x7a0 [ 645.576457] net_rx_action+0x7fa/0x19b0 [ 645.580416] __do_softirq+0x308/0xb7e [ 645.584201] [ 645.585815] The buggy address belongs to the object at ffff8881bfbf3880 [ 645.585815] which belongs to the cache ccid2_hc_tx_sock of size 1240 [ 645.598976] The buggy address is located 0 bytes inside of [ 645.598976] 1240-byte region [ffff8881bfbf3880, ffff8881bfbf3d58) [ 645.610758] The buggy address belongs to the page: [ 645.615674] page:ffffea0006fefc80 count:1 mapcount:0 mapping:ffff8881c5eebc80 index:0x0 compound_mapcount: 0 [ 645.625624] flags: 0x2fffc0000010200(slab|head) [ 645.630279] raw: 02fffc0000010200 ffffea0007000d88 ffffea00075d4488 ffff8881c5eebc80 [ 645.638149] raw: 0000000000000000 ffff8881bfbf2280 0000000100000005 0000000000000000 [ 645.646008] page dumped because: kasan: bad access detected [ 645.651698] [ 645.653325] Memory state around the buggy address: [ 645.658239] ffff8881bfbf3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 645.665580] ffff8881bfbf3800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 645.672941] >ffff8881bfbf3880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 645.680286] ^ [ 645.683636] ffff8881bfbf3900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 645.691001] ffff8881bfbf3980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 645.698369] ================================================================== [ 645.705706] Disabling lock debugging due to kernel taint [ 645.711240] Kernel panic - not syncing: panic_on_warn set ... [ 645.717142] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G B 4.20.0-rc6+ #373 [ 645.725198] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 645.734537] Call Trace: [ 645.737133] [ 645.739278] dump_stack+0x244/0x39d [ 645.742905] ? dump_stack_print_info.cold.1+0x20/0x20 [ 645.748142] panic+0x2ad/0x55c [ 645.751328] ? add_taint.cold.5+0x16/0x16 [ 645.755469] ? trace_hardirqs_on+0xb4/0x310 [ 645.759779] kasan_end_report+0x47/0x4f [ 645.763737] kasan_report.cold.8+0x76/0x309 [ 645.768045] ? ccid_hc_tx_delete+0xe0/0x100 [ 645.772350] __asan_report_load8_noabort+0x14/0x20 [ 645.777263] ccid_hc_tx_delete+0xe0/0x100 [ 645.781404] ? dccp_init_sock+0x4a0/0x4a0 [ 645.785548] dccp_sk_destruct+0x3c/0x80 [ 645.789525] __sk_destruct+0x107/0xa80 [ 645.793396] ? sock_no_getname+0x10/0x10 [ 645.797441] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 645.802536] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 645.807643] ? lockdep_hardirqs_on+0x296/0x5b0 [ 645.812222] ? trace_hardirqs_on+0xbd/0x310 [ 645.816528] ? kasan_check_read+0x11/0x20 [ 645.820662] ? debug_object_deactivate+0x2eb/0x450 [ 645.825580] ? lock_acquire+0x1ed/0x520 [ 645.829575] ? rcu_process_callbacks+0x1103/0x1ac0 [ 645.834493] ? lock_release+0xa00/0xa00 [ 645.838461] ? debug_stats_show+0x100/0x100 [ 645.842787] ? __do_softirq+0x308/0xb7e [ 645.846745] ? trace_hardirqs_off_caller+0x310/0x310 [ 645.851852] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.857375] ? check_preemption_disabled+0x48/0x280 [ 645.862424] ? sock_no_getname+0x10/0x10 [ 645.866489] rcu_process_callbacks+0x100a/0x1ac0 [ 645.871240] ? rcu_note_context_switch+0x2150/0x2150 [ 645.876333] ? find_held_lock+0x36/0x1c0 [ 645.880384] ? rebalance_domains+0x358/0xdc0 [ 645.884791] ? lock_downgrade+0x900/0x900 [ 645.888925] ? check_preemption_disabled+0x48/0x280 [ 645.893926] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 645.898849] ? kasan_check_read+0x11/0x20 [ 645.902997] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 645.908280] ? rcu_softirq_qs+0x20/0x20 [ 645.912246] ? rebalance_domains+0x375/0xdc0 [ 645.916662] ? load_balance+0x39a0/0x39a0 [ 645.920825] ? enqueue_hrtimer+0x1a5/0x560 [ 645.925045] ? hrtimer_update_softirq_timer+0xa0/0xa0 [ 645.930232] ? find_held_lock+0x36/0x1c0 [ 645.934295] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.939829] ? check_preemption_disabled+0x48/0x280 [ 645.944831] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.950355] ? check_preemption_disabled+0x48/0x280 [ 645.955379] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 645.960916] ? rcu_pm_notify+0xc0/0xc0 [ 645.964797] __do_softirq+0x308/0xb7e [ 645.968584] ? ktime_get_raw_ts64+0x4d0/0x4d0 [ 645.973064] ? lock_downgrade+0x900/0x900 [ 645.977210] ? __irqentry_text_end+0x1f9658/0x1f9658 [ 645.982312] ? pvclock_read_flags+0x160/0x160 [ 645.986794] ? lapic_next_event+0x5a/0x90 [ 645.990938] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 645.996467] ? kvm_clock_read+0x18/0x30 [ 646.000430] ? kvm_sched_clock_read+0x9/0x20 [ 646.004841] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 646.010367] ? check_preemption_disabled+0x48/0x280 [ 646.015371] irq_exit+0x17f/0x1c0 [ 646.018811] smp_apic_timer_interrupt+0x1cb/0x760 [ 646.023639] ? smp_reschedule_interrupt+0x109/0x650 [ 646.028655] ? smp_call_function_single_interrupt+0x650/0x650 [ 646.034523] ? interrupt_entry+0xb5/0xc0 [ 646.038568] ? trace_hardirqs_off_caller+0xbb/0x310 [ 646.043569] ? trace_hardirqs_off_caller+0xbb/0x310 [ 646.048574] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 646.053415] ? trace_hardirqs_on_caller+0x310/0x310 [ 646.058419] ? trace_hardirqs_on_caller+0x310/0x310 [ 646.063422] ? task_prio+0x50/0x50 [ 646.066969] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 646.072495] ? check_preemption_disabled+0x48/0x280 [ 646.077510] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 646.082354] apic_timer_interrupt+0xf/0x20 [ 646.086567] [ 646.088792] RIP: 0010:native_safe_halt+0x6/0x10 [ 646.093447] Code: e9 2c ff ff ff 48 89 c7 48 89 45 d8 e8 f3 c0 e7 f9 48 8b 45 d8 e9 ca fe ff ff 48 89 df e8 e2 c0 e7 f9 eb 82 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 [ 646.112333] RSP: 0018:ffff8881d9b27cb8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 646.120024] RAX: dffffc0000000000 RBX: 1ffff1103b364f9b RCX: 0000000000000000 [ 646.127276] RDX: 1ffffffff12a4021 RSI: 0000000000000001 RDI: ffffffff89520108 [ 646.134543] RBP: ffff8881d9b27cb8 R08: ffff8881d9b14340 R09: 0000000000000000 [ 646.141794] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881d9b27d78 [ 646.149047] R13: ffffffff8a1641a0 R14: 0000000000000000 R15: 0000000000000001 [ 646.156319] default_idle+0xbf/0x490 [ 646.160033] ? rcu_dynticks_eqs_enter+0x4f/0x80 [ 646.164707] ? __sched_text_end+0x1/0x1 [ 646.168693] ? rcu_idle_enter+0x39a/0x530 [ 646.172823] ? rcu_eqs_special_set+0x1c0/0x1c0 [ 646.177392] ? tsc_verify_tsc_adjust+0x137/0x450 [ 646.182132] ? trace_hardirqs_off_caller+0x310/0x310 [ 646.187225] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 646.192764] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 646.198303] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 646.203837] arch_cpu_idle+0x10/0x20 [ 646.207534] default_idle_call+0x6d/0x90 [ 646.211579] do_idle+0x49b/0x5c0 [ 646.214994] ? arch_cpu_idle_exit+0x70/0x70 [ 646.219302] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 646.224391] ? complete+0x62/0x80 [ 646.227843] cpu_startup_entry+0x18/0x20 [ 646.231888] start_secondary+0x487/0x5f0 [ 646.235933] ? set_cpu_sibling_map+0x1890/0x1890 [ 646.240681] secondary_startup_64+0xa4/0xb0 [ 646.245973] Kernel Offset: disabled [ 646.249636] Rebooting in 86400 seconds..