Date:   Thu, 21 Dec 2017 20:06:47 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Subject: Re: [Patch net-next] net_sched: call qdisc_reset() with qdisc lock

On Thu, 21 Dec 2017 19:36:51 -0800, John Fastabend wrote:
> diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
> index ab497ef..720829e 100644
> --- a/net/sched/sch_generic.c
> +++ b/net/sched/sch_generic.c
> @@ -1071,7 +1071,8 @@ static bool some_qdisc_is_busy(struct net_device *dev)
>                 q = dev_queue->qdisc_sleeping;
>  
>                 if (q->flags & TCQ_F_NOLOCK) {
> -                       val = test_bit(__QDISC_STATE_SCHED, &q->state);
> +                       val = (qdisc_is_running(q) ||
> +                              test_bit(__QDISC_STATE_SCHED, &q->state));
>                 } else {
>                         root_lock = qdisc_lock(q);
>                         spin_lock_bh(root_lock);

Ah, I just found hpinging the machine with the right .config seems
to be a good trigger.  Testing... I'm afraid KASAN splat still there.
Attaching my .config FWIW.

[   67.870458] ==================================================================
[   67.878616] BUG: KASAN: slab-out-of-bounds in pfifo_fast_dequeue+0x140/0x2d0
[   67.886566] Read of size 8 at addr ffff88036f34c040 by task swapper/12/0
[   67.894123] 
[   67.895854] CPU: 12 PID: 0 Comm: swapper/12 Not tainted 4.15.0-rc3-perf-01035-ge394cb5fbb97-dirty #24
[   67.906232] Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.3.4 11/08/2016
[   67.914665] Call Trace:
[   67.917462]  <IRQ>
[   67.919778]  dump_stack+0xa6/0x118
[   67.923645]  ? _atomic_dec_and_lock+0xe8/0xe8
[   67.928582]  ? pfifo_fast_dequeue+0x140/0x2d0
[   67.933524]  print_address_description+0x6a/0x270
[   67.938839]  ? pfifo_fast_dequeue+0x140/0x2d0
[   67.943775]  kasan_report+0x23f/0x350
[   67.947933]  pfifo_fast_dequeue+0x140/0x2d0
[   67.952676]  ? stack_access_ok+0x3d/0xa0
[   67.957126]  __qdisc_run+0x167/0xa20
[   67.961188]  ? __orc_find+0x6b/0xc0
[   67.965153]  ? sch_direct_xmit+0x3d0/0x3d0
[   67.969820]  ? _raw_spin_unlock+0x73/0xc0
[   67.974388]  ? _raw_spin_trylock+0xe0/0xe0
[   67.979053]  ? deref_stack_reg+0x50/0xd0
[   67.983528]  ? tg3_poll_msix+0x64/0x290 [tg3]
[   67.988529]  ? is_module_text_address+0x11/0x30
[   67.993682]  ? kernel_text_address+0x5a/0x100
[   67.998631]  ? pfifo_fast_enqueue+0x154/0x180
[   68.003591]  __dev_queue_xmit+0x5ae/0x1110
[   68.008268]  ? depot_save_stack+0x12d/0x470
[   68.013023]  ? netdev_pick_tx+0x150/0x150
[   68.017592]  ? __kmalloc_node_track_caller+0x16e/0x2a0
[   68.023424]  ? __kmalloc_reserve.isra.7+0x2e/0x80
[   68.028769]  ? __alloc_skb+0xed/0x390
[   68.032949]  ? sock_wmalloc+0xc2/0x110
[   68.037227]  ? __ip_append_data.isra.3+0xee8/0x1090
[   68.042768]  ? ip_append_data.part.4+0x8b/0xd0
[   68.047821]  ? ip_send_unicast_reply+0x564/0x6d0
[   68.053071]  ? tcp_v4_send_reset+0xa7b/0xd20
[   68.057929]  ? tcp_v4_rcv+0xcce/0x1650
[   68.062207]  ? ip_local_deliver_finish+0x13d/0x3f0
[   68.067649]  ? ip_local_deliver+0xe2/0x280
[   68.072314]  ? ip_rcv_finish+0x5f7/0xa10
[   68.076785]  ? ip_rcv+0x49d/0x780
[   68.080576]  ? __netif_receive_skb_core+0xfa9/0x1bd0
[   68.086213]  ? netif_receive_skb_internal+0x93/0x240
[   68.091849]  ? napi_gro_receive+0x1b3/0x1d0
[   68.096616]  ? tg3_poll_work+0x13e3/0x1d80 [tg3]
[   68.101867]  ? tg3_poll_msix+0x64/0x290 [tg3]
[   68.106825]  ? net_rx_action+0x4a8/0xb00
[   68.111295]  ? __do_softirq+0x17f/0x4de
[   68.115673]  ? irq_exit+0xe1/0xf0
[   68.119463]  ? do_IRQ+0x94/0xe0
[   68.123059]  ? common_interrupt+0x8c/0x8c
[   68.127631]  ? cpuidle_enter_state+0x12a/0x510
[   68.132687]  ? do_idle+0x1af/0x200
[   68.136574]  ? cpu_startup_entry+0xd2/0xe0
[   68.141240]  ? start_secondary+0x271/0x2b0
[   68.145906]  ? secondary_startup_64+0xa5/0xb0
[   68.150862]  ? common_interrupt+0x8c/0x8c
[   68.155430]  ? cpuidle_enter_state+0x12a/0x510
[   68.160508]  ? do_idle+0x1af/0x200
[   68.164396]  ? cpu_startup_entry+0xd2/0xe0
[   68.169061]  ? start_secondary+0x271/0x2b0
[   68.173726]  ? secondary_startup_64+0xa5/0xb0
[   68.178683]  ? ___slab_alloc+0x45d/0x600
[   68.183155]  ? inet_lookup_ifaddr_rcu+0x126/0x170
[   68.188534]  ? memcg_kmem_put_cache+0x63/0x120
[   68.193587]  ? memcg_kmem_get_cache+0x4e0/0x4e0
[   68.198739]  ? __rcu_read_unlock+0x6e/0x120
[   68.203502]  ? memcg_kmem_put_cache+0x63/0x120
[   68.208571]  ? memcg_kmem_get_cache+0x4e0/0x4e0
[   68.213723]  ? __kmalloc_node_track_caller+0x1fe/0x2a0
[   68.219546]  ? __alloc_skb+0xed/0x390
[   68.223726]  ? __kmalloc_reserve.isra.7+0x43/0x80
[   68.229071]  ? memset+0x1f/0x40
[   68.232667]  ? __alloc_skb+0x27e/0x390
[   68.236944]  ? __kmalloc_reserve.isra.7+0x80/0x80
[   68.242289]  ? ktime_get+0x10d/0x1a0
[   68.246370]  ? __rcu_read_unlock+0x6e/0x120
[   68.251134]  ? ip_finish_output2+0x68d/0x7c0
[   68.255994]  ip_finish_output2+0x68d/0x7c0
[   68.260661]  ? ip_send_check+0x60/0x60
[   68.264937]  ? skb_set_owner_w+0x9c/0x120
[   68.269504]  ? sock_wmalloc+0xd5/0x110
[   68.273782]  ? sk_alloc+0x6b0/0x6b0
[   68.277768]  ? ipv4_mtu+0x163/0x200
[   68.281754]  ? ipv4_negative_advice+0x60/0x60
[   68.286710]  ? ip_reply_glue_bits+0x2c/0x50
[   68.291474]  ? __ip_append_data.isra.3+0xdb1/0x1090
[   68.297014]  ? ip_idents_reserve+0x11d/0x1a0
[   68.301872]  ? ipv4_sysctl_rtcache_flush+0x40/0x40
[   68.307315]  ? ip_setup_cork+0x230/0x230
[   68.311786]  ? ip_finish_output+0x39a/0x4c0
[   68.316582]  ip_finish_output+0x39a/0x4c0
[   68.321150]  ? ip_fragment.constprop.5+0xf0/0xf0
[   68.326398]  ? ipv4_mtu+0x163/0x200
[   68.330384]  ? __ip_select_ident+0xf8/0x180
[   68.335147]  ? find_exception+0x270/0x270
[   68.339716]  ? ipv4_mtu+0x163/0x200
[   68.343699]  ? ip_send_check+0x20/0x60
[   68.347978]  ip_output+0x106/0x280
[   68.351865]  ? ip_mc_output+0x750/0x750
[   68.356258]  ? ip_append_page+0x6d0/0x6d0
[   68.360825]  ? ip_append_data.part.4+0x8b/0xd0
[   68.365879]  ip_send_skb+0x29/0x70
[   68.369766]  ? ip_push_pending_frames+0x2e/0x50
[   68.374918]  ip_send_unicast_reply+0x64e/0x6d0
[   68.379973]  ? ip_make_skb+0x1d0/0x1d0
[   68.384257]  ? ip_local_deliver+0xe2/0x280
[   68.388920]  ? ip_rcv+0x49d/0x780
[   68.392711]  ? __netif_receive_skb_core+0xfa9/0x1bd0
[   68.398348]  ? napi_gro_receive+0x1b3/0x1d0
[   68.403113]  ? tg3_poll_work+0x13e3/0x1d80 [tg3]
[   68.408358]  ? tg3_poll_msix+0x64/0x290 [tg3]
[   68.413316]  ? net_rx_action+0x4a8/0xb00
[   68.417788]  ? __do_softirq+0x17f/0x4de
[   68.422163]  ? cpuidle_enter_state+0x12a/0x510
[   68.427218]  ? do_idle+0x1af/0x200
[   68.431104]  ? cpu_startup_entry+0xd2/0xe0
[   68.435769]  ? start_secondary+0x271/0x2b0
[   68.440453]  ? map_id_range_down+0x186/0x1b0
[   68.445311]  ? __put_user_ns+0x30/0x30
[   68.449589]  ? trace_event_raw_event_rcu_torture_read+0x190/0x190
[   68.456529]  tcp_v4_send_reset+0xa7b/0xd20
[   68.461196]  ? tcp_v4_reqsk_send_ack+0x1a0/0x1a0
[   68.466444]  ? __inet_lookup_listener+0x1e5/0x520
[   68.471790]  ? sock_edemux+0x20/0x20
[   68.475873]  ? reweight_entity+0x630/0x630
[   68.480569]  ? rb_insert_color_cached+0x6f3/0x7a0
[   68.485914]  ? rb_insert_color+0x770/0x770
[   68.490581]  ? tcp_v4_rcv+0xcce/0x1650
[   68.494858]  tcp_v4_rcv+0xcce/0x1650
[   68.498941]  ? tcp_v4_early_demux+0x350/0x350
[   68.503900]  ? raw_rcv+0x1b0/0x1b0
[   68.507787]  ? reweight_entity+0x393/0x630
[   68.512482]  ? update_curr+0xa9/0x3c0
[   68.516662]  ? rb_insert_color+0x770/0x770
[   68.521328]  ? __inet_lookup_established+0x12e/0x3d0
[   68.526966]  ? __udp4_lib_rcv+0x1150/0x1150
[   68.531719]  ? load_too_imbalanced+0xd0/0xd0
[   68.536581]  ip_local_deliver_finish+0x13d/0x3f0
[   68.541921]  ? inet_del_offload+0x40/0x40
[   68.546489]  ? update_curr+0xa9/0x3c0
[   68.550667]  ? __rcu_read_unlock+0x6e/0x120
[   68.555431]  ? trace_event_raw_event_rcu_torture_read+0x190/0x190
[   68.562332]  ip_local_deliver+0xe2/0x280
[   68.566804]  ? ip_call_ra_chain+0x2e0/0x2e0
[   68.571567]  ? ip_route_input_noref+0x95/0xd0
[   68.576563]  ? ip_route_input_rcu+0x1570/0x1570
[   68.581716]  ip_rcv_finish+0x5f7/0xa10
[   68.585983]  ? put_prev_task_fair+0x50/0x50
[   68.590747]  ? ip_local_deliver_finish+0x3f0/0x3f0
[   68.596204]  ? account_entity_enqueue+0x1d2/0x240
[   68.601551]  ? load_too_imbalanced+0xd0/0xd0
[   68.606409]  ? __update_load_avg_cfs_rq.isra.5+0x2b6/0x2c0
[   68.612628]  ? __enqueue_entity+0x93/0xc0
[   68.617196]  ? tcp_v4_send_synack+0x1a0/0x1a0
[   68.622153]  ? enqueue_entity+0xc16/0x1450
[   68.626817]  ? rb_insert_color_cached+0x6f3/0x7a0
[   68.632180]  ? rb_insert_color+0x770/0x770
[   68.636847]  ? __dev_queue_xmit+0x61d/0x1110
[   68.641706]  ? put_prev_task_fair+0x50/0x50
[   68.646468]  ip_rcv+0x49d/0x780
[   68.650066]  ? ip_local_deliver+0x280/0x280
[   68.654830]  ? idle_cpu+0x100/0x100
[   68.658818]  ? __alloc_pages_nodemask+0x316/0x1d30
[   68.664277]  ? enqueue_task_fair+0x2d9/0x10d0
[   68.669235]  ? smp_thermal_interrupt+0x230/0x230
[   68.674484]  ? update_cfs_group+0x232/0x290
[   68.679246]  ? rb_insert_color+0x770/0x770
[   68.683910]  ? reweight_entity+0x630/0x630
[   68.688583]  ? ip_local_deliver+0x280/0x280
[   68.693346]  __netif_receive_skb_core+0xfa9/0x1bd0
[   68.698791]  ? flush_backlog+0x250/0x250
[   68.703262]  ? 0xffffffffa0000000
[   68.707052]  ? update_curr+0xa9/0x3c0
[   68.711230]  ? stack_access_ok+0x3d/0xa0
[   68.715702]  ? __module_address+0x232/0x330
[   68.720498]  ? modules_open+0x60/0x60
[   68.724678]  ? __accumulate_pelt_segments+0x47/0xd0
[   68.730217]  ? __module_address+0x232/0x330
[   68.734980]  ? stack_access_ok+0x3d/0xa0
[   68.739450]  ? deref_stack_reg+0x98/0xd0
[   68.743922]  ? __read_once_size_nocheck.constprop.3+0x10/0x10
[   68.750435]  ? get_stack_info+0x37/0x150
[   68.754906]  ? __orc_find+0x6b/0xc0
[   68.758891]  ? secondary_startup_64+0xa4/0xb0
[   68.763848]  ? unwind_next_frame+0xcd/0xbf0
[   68.768610]  ? cpuidle_enter_state+0x12a/0x510
[   68.773667]  ? tg3_poll_msix+0x64/0x290 [tg3]
[   68.778623]  ? deref_stack_reg+0xd0/0xd0
[   68.783093]  ? __build_skb+0x85/0x210
[   68.787276]  ? tg3_poll_msix+0x64/0x290 [tg3]
[   68.792242]  ? is_module_text_address+0x11/0x30
[   68.797393]  ? kernel_text_address+0x5a/0x100
[   68.802350]  ? _mix_pool_bytes+0x1fc/0x260
[   68.807019]  ? tg3_poll_msix+0x64/0x290 [tg3]
[   68.811975]  ? __build_skb+0x85/0x210
[   68.816155]  ? __save_stack_trace+0x73/0xd0
[   68.831167]  ? depot_save_stack+0x12d/0x470
[   68.835929]  ? __build_skb+0x85/0x210
[   68.840108]  ? kasan_kmalloc+0x142/0x170
[   68.844591]  ? kmem_cache_alloc+0xb3/0x1c0
[   68.849247]  ? __build_skb+0x85/0x210
[   68.853425]  ? __netdev_alloc_skb+0xeb/0x150
[   68.858287]  ? tg3_poll_work+0x1113/0x1d80 [tg3]
[   68.863535]  ? __rcu_read_unlock+0x6e/0x120
[   68.868299]  ? trace_event_raw_event_rcu_torture_read+0x190/0x190
[   68.875199]  ? tcp_gro_receive+0x3cd/0x550
[   68.879865]  ? tcp4_gro_receive+0x25/0x350
[   68.884566]  ? start_secondary+0x271/0x2b0
[   68.889230]  ? secondary_startup_64+0xa5/0xb0
[   68.894187]  ? inet_gro_receive+0x19a/0x5e0
[   68.898950]  ? ktime_get_with_offset+0x144/0x1e0
[   68.904217]  ? ktime_get_resolution_ns+0xf0/0xf0
[   68.909457]  ? trace_event_raw_event_rcu_torture_read+0x190/0x190
[   68.916360]  ? trace_event_raw_event_rcu_torture_read+0x190/0x190
[   68.923261]  ? netif_receive_skb_internal+0x93/0x240
[   68.928897]  netif_receive_skb_internal+0x93/0x240
[   68.934340]  ? dev_cpu_dead+0x470/0x470
[   68.938715]  ? __build_skb+0x85/0x210
[   68.942895]  ? net_rx_action+0xb00/0xb00
[   68.947366]  ? memset+0x1f/0x40
[   68.950962]  ? __build_skb+0x1b7/0x210
[   68.955238]  ? skb_push+0x80/0x80
[   68.959029]  napi_gro_receive+0x1b3/0x1d0
[   68.963597]  ? dev_gro_receive+0xc50/0xc50
[   68.968284]  tg3_poll_work+0x13e3/0x1d80 [tg3]
[   68.973346]  ? tg3_poll_controller+0x90/0x90 [tg3]
[   68.978787]  ? enqueue_entity+0x1450/0x1450
[   68.983551]  ? napi_complete_done+0x159/0x2e0
[   68.988547]  ? napi_gro_flush+0xd0/0xd0
[   68.992922]  ? rb_insert_color+0x12e/0x770
[   68.997588]  ? rb_first_postorder+0x50/0x50
[   69.002353]  ? rcu_segcblist_extract_pend_cbs+0xa0/0xa0
[   69.008282]  ? dequeue_rt_stack+0x103/0x5a0
[   69.013050]  tg3_poll_msix+0x64/0x290 [tg3]
[   69.017814]  net_rx_action+0x4a8/0xb00
[   69.022093]  ? napi_complete_done+0x2e0/0x2e0
[   69.027108]  ? read_exit_mmio+0x140/0x140 [kvm]
[   69.032277]  ? update_max_interval+0x40/0x40
[   69.037136]  ? wait_rcu_exp_gp+0x60/0x60
[   69.041607]  ? _raw_spin_unlock+0xc0/0xc0
[   69.046175]  ? rcu_segcblist_future_gp_needed+0x48/0x80
[   69.052105]  ? cpu_needs_another_gp+0x29e/0x2b0
[   69.057255]  ? print_other_cpu_stall+0x870/0x870
[   69.062503]  ? __wake_up_common+0xa9/0x2d0
[   69.067169]  ? __note_gp_changes+0x670/0x670
[   69.072028]  ? remove_wait_queue+0x160/0x160
[   69.076889]  ? _raw_spin_unlock+0xc0/0xc0
[   69.081457]  ? resched_curr+0x84/0x1b0
[   69.085732]  ? wake_q_add+0x50/0x50
[   69.089720]  ? cyc2ns_read_end+0x20/0x20
[   69.094192]  ? _raw_spin_unlock+0xc0/0xc0
[   69.098759]  ? _raw_spin_trylock+0xe0/0xe0
[   69.103425]  ? native_sched_clock_from_tsc+0x130/0x160
[   69.109258]  ? sched_clock_cpu+0x14/0xf0
[   69.113730]  ? try_to_wake_up+0x4a9/0x7f0
[   69.118300]  ? raise_softirq_irqoff+0x40/0x40
[   69.123257]  ? migrate_swap_stop+0x3b0/0x3b0
[   69.128117]  ? crng_reseed+0x3d0/0x3d0
[   69.132398]  ? _raw_spin_unlock+0xc0/0xc0
[   69.136966]  ? cyc2ns_read_begin+0x20/0x90
[   69.141633]  ? add_interrupt_randomness+0x1cd/0x3d0
[   69.147177]  ? tg3_interrupt_tagged+0x1b0/0x1b0 [tg3]
[   69.152911]  ? xfer_secondary_pool+0x70/0x70
[   69.157771]  ? irq_wait_for_poll+0xf0/0xf0
[   69.162437]  __do_softirq+0x17f/0x4de
[   69.166618]  ? __softirqentry_text_start+0x8/0x8
[   69.171866]  ? handle_irq_event_percpu+0xb9/0xf0
[   69.177116]  ? __handle_irq_event_percpu+0x390/0x390
[   69.182745]  ? nr_iowait+0x110/0x110
[   69.186828]  ? _raw_spin_unlock+0x73/0xc0
[   69.191397]  ? _raw_spin_trylock+0xe0/0xe0
[   69.196062]  ? handle_irq_event+0x79/0x90
[   69.200629]  ? handle_edge_irq+0x166/0x2f0
[   69.205295]  irq_exit+0xe1/0xf0
[   69.208892]  do_IRQ+0x94/0xe0
[   69.212295]  common_interrupt+0x8c/0x8c
[   69.216669]  </IRQ>
[   69.219100] RIP: 0010:cpuidle_enter_state+0x12a/0x510
[   69.224835] RSP: 0018:ffff88036c7cfd08 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffdd
[   69.233409] RAX: 0000000000000000 RBX: ffffe8fb00b060e0 RCX: ffffffffa01329f5
[   69.241476] RDX: dffffc0000000000 RSI: dffffc0000000000 RDI: ffff8803703246e8
[   69.249542] RBP: 1ffff1006d8f9fa6 R08: fffffbfff43429f8 R09: fffffbfff43429f8
[   69.257608] R10: ffff88036c7cfcc8 R11: fffffbfff43429f7 R12: 0000000fcd62a077
[   69.265673] R13: 0000000000000002 R14: 0000000000000002 R15: ffffffffa183eac0
[   69.273741]  ? sched_idle_set_state+0x25/0x30
[   69.278699]  ? cpuidle_enter_state+0x106/0x510
[   69.283754]  ? cpuidle_enter_s2idle+0x130/0x130
[   69.288906]  ? rcu_eqs_enter_common.constprop.62+0xd1/0x1e0
[   69.295223]  ? rcu_gp_init+0xf70/0xf70
[   69.299499]  ? sched_set_stop_task+0x160/0x160
[   69.304586]  do_idle+0x1af/0x200
[   69.308287]  cpu_startup_entry+0xd2/0xe0
[   69.312759]  ? cpu_in_idle+0x20/0x20
[   69.316842]  ? _raw_spin_trylock+0xe0/0xe0
[   69.321508]  ? memcpy+0x34/0x50
[   69.325107]  start_secondary+0x271/0x2b0
[   69.329577]  ? set_cpu_sibling_map+0x840/0x840
[   69.334633]  secondary_startup_64+0xa5/0xb0
[   69.339387] 
[   69.341136] Allocated by task 844:
[   69.345024]  __kmalloc+0xfa/0x230
[   69.348815]  pfifo_fast_init+0x69/0x160
[   69.353190]  qdisc_create_dflt+0x97/0xc0
[   69.357661]  mq_init+0x19f/0x1f0
[   69.361356]  qdisc_create_dflt+0x97/0xc0
[   69.365825]  dev_activate+0x48e/0x4e0
[   69.370005]  __dev_open+0x19e/0x210
[   69.373989]  __dev_change_flags+0x3b5/0x3f0
[   69.378751]  dev_change_flags+0x50/0xa0
[   69.383126]  do_setlink+0x5eb/0x1cf0
[   69.387209]  rtnl_newlink+0x9d5/0xe40
[   69.391390]  rtnetlink_rcv_msg+0x37c/0x7e0
[   69.396122]  netlink_rcv_skb+0x122/0x230
[   69.400594]  netlink_unicast+0x2ae/0x360
[   69.405066]  netlink_sendmsg+0x5d5/0x620
[   69.409536]  sock_sendmsg+0x64/0x80
[   69.413520]  ___sys_sendmsg+0x4a8/0x500
[   69.417894]  __sys_sendmsg+0xa9/0x140
[   69.422073]  entry_SYSCALL_64_fastpath+0x1e/0x81
[   69.427319] 
[   69.429067] Freed by task 1:
[   69.432371]  kfree+0x8d/0x1c0
[   69.435775]  erst_reader+0x7ef/0x980
[   69.439857]  pstore_get_backend_records+0xdf/0x370
[   69.445303]  pstore_get_records+0x69/0x90
[   69.449872]  pstore_fill_super+0xfe/0x110
[   69.454441]  mount_single+0x60/0xe0
[   69.458426]  mount_fs+0x48/0x190
[   69.462122]  vfs_kern_mount.part.7+0x9f/0x210
[   69.467079]  do_mount+0x945/0x1690
[   69.470965]  SyS_mount+0x55/0xd0
[   69.474658]  entry_SYSCALL_64_fastpath+0x1e/0x81
[   69.479904] 
[   69.481652] The buggy address belongs to the object at ffff88036f34a100
[   69.481652]  which belongs to the cache kmalloc-8192 of size 8192
[   69.495958] The buggy address is located 8000 bytes inside of
[   69.495958]  8192-byte region [ffff88036f34a100, ffff88036f34c100)
[   69.509388] The buggy address belongs to the page:
[   69.514832] page:0000000086a349ff count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
[   69.525933] flags: 0x2ffff0000008100(slab|head)
[   69.531084] raw: 02ffff0000008100 0000000000000000 0000000000000000 0000000100030003
[   69.539852] raw: dead000000000100 dead000000000200 ffff88036fc0e680 0000000000000000
[   69.548640] page dumped because: kasan: bad access detected
[   69.554955] 
[   69.556704] Memory state around the buggy address:
[   69.562147]  ffff88036f34bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   69.570331]  ffff88036f34bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   69.578515] >ffff88036f34c000: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
[   69.586699]                                            ^
[   69.592725]  ffff88036f34c080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   69.600901]  ffff88036f34c100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   69.609084] ==================================================================

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