[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 34.242610] random: sshd: uninitialized urandom read (32 bytes read) [ 34.480313] kauditd_printk_skb: 11 callbacks suppressed [ 34.480321] audit: type=1400 audit(1568037691.819:35): avc: denied { map } for pid=6966 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 [ 34.535115] random: sshd: uninitialized urandom read (32 bytes read) [ 35.079188] random: sshd: uninitialized urandom read (32 bytes read) [ 254.283012] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.1.22' (ECDSA) to the list of known hosts. [ 259.819810] random: sshd: uninitialized urandom read (32 bytes read) [ 259.943029] audit: type=1400 audit(1568037917.279:36): avc: denied { map } for pid=6979 comm="syz-executor961" path="/root/syz-executor961505715" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 260.171281] IPVS: ftp: loaded support on port[0] = 21 [ 260.973609] chnl_net:caif_netlink_parms(): no params data found [ 261.005893] bridge0: port 1(bridge_slave_0) entered blocking state [ 261.012737] bridge0: port 1(bridge_slave_0) entered disabled state [ 261.019754] device bridge_slave_0 entered promiscuous mode [ 261.026890] bridge0: port 2(bridge_slave_1) entered blocking state [ 261.033330] bridge0: port 2(bridge_slave_1) entered disabled state [ 261.040597] device bridge_slave_1 entered promiscuous mode [ 261.055050] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 261.063899] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 261.079382] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 261.086955] team0: Port device team_slave_0 added [ 261.092460] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 261.099500] team0: Port device team_slave_1 added [ 261.104826] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 261.112057] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 261.162140] device hsr_slave_0 entered promiscuous mode [ 261.220347] device hsr_slave_1 entered promiscuous mode [ 261.260613] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 261.267496] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 261.280956] bridge0: port 2(bridge_slave_1) entered blocking state [ 261.287482] bridge0: port 2(bridge_slave_1) entered forwarding state [ 261.294494] bridge0: port 1(bridge_slave_0) entered blocking state [ 261.300885] bridge0: port 1(bridge_slave_0) entered forwarding state [ 261.328871] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 261.336229] 8021q: adding VLAN 0 to HW filter on device bond0 [ 261.344230] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 261.352798] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 261.371808] bridge0: port 1(bridge_slave_0) entered disabled state [ 261.379190] bridge0: port 2(bridge_slave_1) entered disabled state [ 261.388910] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 261.395913] 8021q: adding VLAN 0 to HW filter on device team0 [ 261.403897] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 261.412191] bridge0: port 1(bridge_slave_0) entered blocking state [ 261.418639] bridge0: port 1(bridge_slave_0) entered forwarding state [ 261.428936] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 261.437176] bridge0: port 2(bridge_slave_1) entered blocking state [ 261.443555] bridge0: port 2(bridge_slave_1) entered forwarding state [ 261.461939] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 261.469540] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 261.477203] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 261.485216] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 261.493593] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 261.502285] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 261.508277] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 261.520439] IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready executing program [ 261.529673] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 366.560026] INFO: rcu_preempt self-detected stall on CPU [ 366.565559] 0-...: (1 GPs behind) idle=a7e/140000000000001/0 softirq=18912/18913 fqs=8 [ 366.573766] (t=10500 jiffies g=1134 c=1133 q=161) [ 366.578772] rcu_preempt kthread starved for 10484 jiffies! g1134 c1133 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 [ 366.589234] rcu_preempt R running task 29776 8 2 0x80000000 [ 366.596447] Call Trace: [ 366.599120] __schedule+0x7b8/0x1cd0 [ 366.603955] ? pci_mmcfg_check_reserved+0x150/0x150 [ 366.609038] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 366.614141] schedule+0x92/0x1c0 [ 366.617487] schedule_timeout+0x43e/0xe10 [ 366.621618] ? usleep_range+0x130/0x130 [ 366.625584] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 366.630854] ? prepare_to_swait+0xcc/0x100 [ 366.635096] ? call_timer_fn+0x670/0x670 [ 366.639159] rcu_gp_kthread+0xbf4/0x1ec0 [ 366.643232] ? force_qs_rnp+0x4d0/0x4d0 [ 366.647196] kthread+0x319/0x430 [ 366.650543] ? force_qs_rnp+0x4d0/0x4d0 [ 366.654508] ? kthread_create_on_node+0xd0/0xd0 [ 366.659159] ret_from_fork+0x24/0x30 [ 366.663054] NMI backtrace for cpu 0 [ 366.666846] CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.14.142 #0 [ 366.673228] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 366.682627] Workqueue: ipv6_addrconf addrconf_dad_work [ 366.687885] Call Trace: [ 366.690449] [ 366.692616] dump_stack+0x138/0x197 [ 366.696226] nmi_cpu_backtrace.cold+0x57/0x94 [ 366.700703] ? irq_force_complete_move.cold+0x7d/0x7d [ 366.705881] nmi_trigger_cpumask_backtrace+0x141/0x189 [ 366.711139] arch_trigger_cpumask_backtrace+0x14/0x20 [ 366.716324] rcu_dump_cpu_stacks+0x186/0x1d2 [ 366.720718] rcu_check_callbacks.cold+0x43d/0xd0a [ 366.725543] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 366.730983] update_process_times+0x31/0x70 [ 366.735295] tick_sched_handle+0x85/0x160 [ 366.739475] tick_sched_timer+0x43/0x130 [ 366.743521] __hrtimer_run_queues+0x270/0xbc0 [ 366.748002] ? tick_sched_do_timer+0xe0/0xe0 [ 366.752395] ? hrtimer_start_range_ns+0x10d0/0x10d0 [ 366.757400] hrtimer_interrupt+0x1d8/0x5d0 [ 366.761710] smp_apic_timer_interrupt+0x11c/0x5e0 [ 366.766538] apic_timer_interrupt+0x96/0xa0 [ 366.770862] [ 366.773085] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 [ 366.778427] RSP: 0018:ffff8880a9c7f008 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff10 [ 366.786261] RAX: ffff8880a11041f8 RBX: ffff8880a11041f8 RCX: 0000000000000000 [ 366.793756] RDX: 0000000000000000 RSI: ffff8880a1104290 RDI: ffff8880a1104200 [ 366.801021] RBP: ffff8880a9c7f060 R08: 0000000000000000 R09: ffff8880a9c72ac8 [ 366.808314] R10: ffff8880a9c72aa8 R11: ffff8880a9c720c0 R12: dffffc0000000000 [ 366.815659] R13: ffff8880a1104000 R14: ffff8880a1104290 R15: ffff8880a1104280 [ 366.822998] ? hhf_dequeue+0x75/0xa60 [ 366.826849] __qdisc_run+0x2b8/0xe00 [ 366.830582] __dev_queue_xmit+0x1571/0x25e0 [ 366.834902] ? __lock_is_held+0xb6/0x140 [ 366.838970] ? check_preemption_disabled+0x3c/0x250 [ 366.843973] ? netdev_pick_tx+0x300/0x300 [ 366.848104] ? save_trace+0x290/0x290 [ 366.851947] ? br_nf_post_routing+0x27d/0xf00 [ 366.856465] ? br_forward_finish+0x1cc/0x320 [ 366.860857] ? find_held_lock+0x35/0x130 [ 366.864897] ? br_forward_finish+0x1cc/0x320 [ 366.869290] dev_queue_xmit+0x18/0x20 [ 366.873073] ? dev_queue_xmit+0x18/0x20 [ 366.877030] br_dev_queue_push_xmit+0x367/0x530 [ 366.881700] br_forward_finish+0xbc/0x320 [ 366.885829] ? br_dev_queue_push_xmit+0x530/0x530 [ 366.890656] ? br_fdb_add.cold+0x84/0x84 [ 366.894701] __br_forward+0x560/0x9c0 [ 366.898487] ? br_forward_finish+0x320/0x320 [ 366.902882] ? br_dev_queue_push_xmit+0x530/0x530 [ 366.907733] deliver_clone+0x61/0xc0 [ 366.911431] br_flood+0x3c8/0x530 [ 366.914871] br_dev_xmit+0x9a4/0xd40 [ 366.918566] ? check_preemption_disabled+0x3c/0x250 [ 366.923582] ? br_poll_controller+0x10/0x10 [ 366.927894] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 366.933329] dev_hard_start_xmit+0x18c/0x8b0 [ 366.937720] ? assoc_array_gc+0x1130/0x11d0 [ 366.942025] __dev_queue_xmit+0x1d95/0x25e0 [ 366.946331] ? trace_hardirqs_on+0x10/0x10 [ 366.950640] ? netdev_pick_tx+0x300/0x300 [ 366.954781] ? ip6_finish_output2+0x9ab/0x21b0 [ 366.959346] ? memcpy+0x46/0x50 [ 366.962609] dev_queue_xmit+0x18/0x20 [ 366.966415] ? dev_queue_xmit+0x18/0x20 [ 366.970434] neigh_resolve_output+0x4d8/0x870 [ 366.975010] ip6_finish_output2+0x9ab/0x21b0 [ 366.979404] ? ip6_forward_finish+0x480/0x480 [ 366.983882] ? lock_downgrade+0x6e0/0x6e0 [ 366.988015] ip6_finish_output+0x4f4/0xb50 [ 366.992229] ? ip6_finish_output+0x4f4/0xb50 [ 366.996618] ip6_output+0x20f/0x6d0 [ 367.000226] ? ip6_finish_output+0xb50/0xb50 [ 367.004619] ? __lock_is_held+0xb6/0x140 [ 367.008662] ? ip6_fragment+0x32c0/0x32c0 [ 367.012848] ndisc_send_skb+0xb56/0x11e0 [ 367.016896] ? ndisc_error_report+0x190/0x190 [ 367.021389] ndisc_send_ns+0x360/0x7e0 [ 367.025265] ? ndisc_netdev_event+0x3b0/0x3b0 [ 367.029841] ? trace_hardirqs_on_caller+0x400/0x590 [ 367.034837] ? addrconf_dad_work+0x97c/0xff0 [ 367.039225] ? trace_hardirqs_on+0xd/0x10 [ 367.043356] ? __local_bh_enable_ip+0x99/0x1a0 [ 367.048010] addrconf_dad_work+0xa40/0xff0 [ 367.052231] ? addrconf_dad_completed+0xa70/0xa70 [ 367.057054] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 367.062511] process_one_work+0x863/0x1600 [ 367.066733] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 367.071389] worker_thread+0x5d9/0x1050 [ 367.075353] kthread+0x319/0x430 [ 367.078699] ? process_one_work+0x1600/0x1600 [ 367.083196] ? kthread_create_on_node+0xd0/0xd0 [ 367.087851] ret_from_fork+0x24/0x30 [ 367.100019] INFO: rcu_sched detected stalls on CPUs/tasks: [ 367.105684] 0-...: (1 GPs behind) idle=a7e/140000000000000/0 softirq=18912/18913 fqs=8 [ 367.113899] (detected by 1, t=10555 jiffies, g=779, c=778, q=9) [ 367.120044] Sending NMI from CPU 1 to CPUs 0: [ 367.125159] NMI backtrace for cpu 0 [ 367.125162] CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.14.142 #0 [ 367.125166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 367.125168] Workqueue: ipv6_addrconf addrconf_dad_work [ 367.125173] task: ffff8880a9c720c0 task.stack: ffff8880a9c78000 [ 367.125175] RIP: 0010:__list_add_valid+0xa/0xa0 [ 367.125177] RSP: 0018:ffff8880a9c7f008 EFLAGS: 00000246 [ 367.125181] RAX: dffffc0000000000 RBX: ffff8880a11041f8 RCX: 0000000000000000 [ 367.125184] RDX: ffff8880a1104290 RSI: ffff8880a1104290 RDI: ffff8880a11041f8 [ 367.125186] RBP: ffff8880a9c7f060 R08: 0000000000000000 R09: ffff8880a9c72ac8 [ 367.125189] R10: ffff8880a9c72aa8 R11: ffff8880a9c720c0 R12: dffffc0000000000 [ 367.125192] R13: ffff8880a1104000 R14: ffff8880a1104290 R15: ffff8880a1104280 [ 367.125195] FS: 0000000000000000(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 [ 367.125198] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 367.125200] CR2: 000055e89c4c4190 CR3: 0000000091df7000 CR4: 00000000001406f0 [ 367.125203] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 367.125206] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 367.125207] Call Trace: [ 367.125209] ? hhf_dequeue+0x61b/0xa60 [ 367.125211] __qdisc_run+0x2b8/0xe00 [ 367.125213] __dev_queue_xmit+0x1571/0x25e0 [ 367.125215] ? __lock_is_held+0xb6/0x140 [ 367.125217] ? check_preemption_disabled+0x3c/0x250 [ 367.125219] ? netdev_pick_tx+0x300/0x300 [ 367.125221] ? save_trace+0x290/0x290 [ 367.125223] ? br_nf_post_routing+0x27d/0xf00 [ 367.125225] ? br_forward_finish+0x1cc/0x320 [ 367.125227] ? find_held_lock+0x35/0x130 [ 367.125230] ? br_forward_finish+0x1cc/0x320 [ 367.125231] dev_queue_xmit+0x18/0x20 [ 367.125234] ? dev_queue_xmit+0x18/0x20 [ 367.125236] br_dev_queue_push_xmit+0x367/0x530 [ 367.125238] br_forward_finish+0xbc/0x320 [ 367.125240] ? br_dev_queue_push_xmit+0x530/0x530 [ 367.125242] ? br_fdb_add.cold+0x84/0x84 [ 367.125244] __br_forward+0x560/0x9c0 [ 367.125246] ? br_forward_finish+0x320/0x320 [ 367.125248] ? br_dev_queue_push_xmit+0x530/0x530 [ 367.125250] deliver_clone+0x61/0xc0 [ 367.125252] br_flood+0x3c8/0x530 [ 367.125253] br_dev_xmit+0x9a4/0xd40 [ 367.125256] ? check_preemption_disabled+0x3c/0x250 [ 367.125258] ? br_poll_controller+0x10/0x10 [ 367.125260] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 367.125262] dev_hard_start_xmit+0x18c/0x8b0 [ 367.125264] ? assoc_array_gc+0x1130/0x11d0 [ 367.125266] __dev_queue_xmit+0x1d95/0x25e0 [ 367.125268] ? trace_hardirqs_on+0x10/0x10 [ 367.125270] ? netdev_pick_tx+0x300/0x300 [ 367.125272] ? ip6_finish_output2+0x9ab/0x21b0 [ 367.125274] ? memcpy+0x46/0x50 [ 367.125276] dev_queue_xmit+0x18/0x20 [ 367.125278] ? dev_queue_xmit+0x18/0x20 [ 367.125280] neigh_resolve_output+0x4d8/0x870 [ 367.125282] ip6_finish_output2+0x9ab/0x21b0 [ 367.125284] ? ip6_forward_finish+0x480/0x480 [ 367.125286] ? lock_downgrade+0x6e0/0x6e0 [ 367.125288] ip6_finish_output+0x4f4/0xb50 [ 367.125290] ? ip6_finish_output+0x4f4/0xb50 [ 367.125292] ip6_output+0x20f/0x6d0 [ 367.125294] ? ip6_finish_output+0xb50/0xb50 [ 367.125296] ? __lock_is_held+0xb6/0x140 [ 367.125298] ? ip6_fragment+0x32c0/0x32c0 [ 367.125300] ndisc_send_skb+0xb56/0x11e0 [ 367.125302] ? ndisc_error_report+0x190/0x190 [ 367.125304] ndisc_send_ns+0x360/0x7e0 [ 367.125306] ? ndisc_netdev_event+0x3b0/0x3b0 [ 367.125308] ? trace_hardirqs_on_caller+0x400/0x590 [ 367.125310] ? addrconf_dad_work+0x97c/0xff0 [ 367.125312] ? trace_hardirqs_on+0xd/0x10 [ 367.125314] ? __local_bh_enable_ip+0x99/0x1a0 [ 367.125316] addrconf_dad_work+0xa40/0xff0 [ 367.125318] ? addrconf_dad_completed+0xa70/0xa70 [ 367.125320] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 367.125322] process_one_work+0x863/0x1600 [ 367.125324] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 367.125326] worker_thread+0x5d9/0x1050 [ 367.125328] kthread+0x319/0x430 [ 367.125330] ? process_one_work+0x1600/0x1600 [ 367.125332] ? kthread_create_on_node+0xd0/0xd0 [ 367.125334] ret_from_fork+0x24/0x30 [ 367.125335] Code: 89 e6 48 c7 c7 c0 2e 9d 86 e8 73 fd ff ff 41 5c 5d c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df <55> 48 89 e5 41 55 49 89 fd 48 8d 7a 08 41 54 49 89 d4 48 89 fa [ 367.125547] rcu_sched kthread starved for 10540 jiffies! g779 c778 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 [ 367.540547] rcu_sched R running task 29824 9 2 0x80000000 [ 367.548356] Call Trace: [ 367.550948] __schedule+0x7b8/0x1cd0 [ 367.554659] ? pci_mmcfg_check_reserved+0x150/0x150 [ 367.559668] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 367.564775] schedule+0x92/0x1c0 [ 367.568132] schedule_timeout+0x43e/0xe10 [ 367.572270] ? usleep_range+0x130/0x130 [ 367.576229] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 367.581357] ? prepare_to_swait+0xcc/0x100 [ 367.585604] ? call_timer_fn+0x670/0x670 [ 367.589681] rcu_gp_kthread+0xbf4/0x1ec0 [ 367.593758] ? force_qs_rnp+0x4d0/0x4d0 [ 367.597729] kthread+0x319/0x430 [ 367.601082] ? force_qs_rnp+0x4d0/0x4d0 [ 367.605047] ? kthread_create_on_node+0xd0/0xd0 [ 367.610081] ret_from_fork+0x24/0x30