[ 67.395352][ T26] audit: type=1800 audit(1582025129.635:25): pid=9504 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 67.422245][ T26] audit: type=1800 audit(1582025129.635:26): pid=9504 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 67.463316][ T26] audit: type=1800 audit(1582025129.645:27): pid=9504 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 67.997339][ T9571] sshd (9571) used greatest stack depth: 22776 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.140' (ECDSA) to the list of known hosts. syzkaller login: [ 76.387235][ T9657] IPVS: ftp: loaded support on port[0] = 21 [ 76.433733][ T9657] chnl_net:caif_netlink_parms(): no params data found [ 76.467485][ T9657] bridge0: port 1(bridge_slave_0) entered blocking state [ 76.475248][ T9657] bridge0: port 1(bridge_slave_0) entered disabled state [ 76.483076][ T9657] device bridge_slave_0 entered promiscuous mode [ 76.491016][ T9657] bridge0: port 2(bridge_slave_1) entered blocking state [ 76.498228][ T9657] bridge0: port 2(bridge_slave_1) entered disabled state [ 76.505825][ T9657] device bridge_slave_1 entered promiscuous mode [ 76.521783][ T9657] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 76.533261][ T9657] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 76.551429][ T9657] team0: Port device team_slave_0 added [ 76.559232][ T9657] team0: Port device team_slave_1 added [ 76.572502][ T9657] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 76.579448][ T9657] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 76.605396][ T9657] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 76.617529][ T9657] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 76.624573][ T9657] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 76.650609][ T9657] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 76.724696][ T9657] device hsr_slave_0 entered promiscuous mode [ 76.762965][ T9657] device hsr_slave_1 entered promiscuous mode [ 76.859964][ T9657] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 76.905294][ T9657] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 76.945210][ T9657] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 76.994260][ T9657] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 77.045729][ T9657] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.052920][ T9657] bridge0: port 2(bridge_slave_1) entered forwarding state [ 77.060472][ T9657] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.067575][ T9657] bridge0: port 1(bridge_slave_0) entered forwarding state [ 77.109851][ T9657] 8021q: adding VLAN 0 to HW filter on device bond0 [ 77.122006][ T4075] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 77.131916][ T4075] bridge0: port 1(bridge_slave_0) entered disabled state [ 77.140255][ T4075] bridge0: port 2(bridge_slave_1) entered disabled state [ 77.148149][ T4075] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 77.160871][ T9657] 8021q: adding VLAN 0 to HW filter on device team0 [ 77.171851][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 77.180324][ T2691] bridge0: port 1(bridge_slave_0) entered blocking state [ 77.187386][ T2691] bridge0: port 1(bridge_slave_0) entered forwarding state [ 77.198740][ T4075] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 77.207772][ T4075] bridge0: port 2(bridge_slave_1) entered blocking state [ 77.214986][ T4075] bridge0: port 2(bridge_slave_1) entered forwarding state [ 77.233557][ T4075] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 77.242136][ T4075] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 77.259300][ T9657] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 77.270188][ T9657] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 77.285287][ T4074] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 77.293634][ T4074] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 77.301968][ T4074] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 77.311089][ T4074] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 77.327357][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 77.334766][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 77.348423][ T9657] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 77.366337][ T4074] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 77.384993][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 77.393379][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 77.400979][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 77.411375][ T9657] device veth0_vlan entered promiscuous mode [ 77.423010][ T9657] device veth1_vlan entered promiscuous mode [ 77.433892][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 77.441839][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 77.458875][ T4074] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 77.467881][ T4074] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 77.481617][ T9657] device veth0_macvtap entered promiscuous mode [ 77.491872][ T9657] device veth1_macvtap entered promiscuous mode [ 77.508048][ T9657] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 77.515997][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 77.524974][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 77.532995][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 77.541312][ T2691] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 77.552520][ T9657] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 77.564223][ T4076] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 77.573267][ T4076] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 77.742679][ C0] ================================================================== [ 77.750857][ C0] BUG: KASAN: use-after-free in find_match+0xb39/0xc90 [ 77.757683][ C0] Read of size 8 at addr ffff88809fb74320 by task ksoftirqd/0/9 [ 77.765285][ C0] [ 77.767598][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.6.0-rc2-syzkaller #0 [ 77.775637][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.785674][ C0] Call Trace: [ 77.788955][ C0] dump_stack+0x197/0x210 [ 77.793309][ C0] ? find_match+0xb39/0xc90 [ 77.797802][ C0] print_address_description.constprop.0.cold+0xd4/0x30b [ 77.804809][ C0] ? find_match+0xb39/0xc90 [ 77.809294][ C0] ? find_match+0xb39/0xc90 [ 77.813785][ C0] __kasan_report.cold+0x1b/0x32 [ 77.818701][ C0] ? find_match+0xb39/0xc90 [ 77.823186][ C0] kasan_report+0x12/0x20 [ 77.827496][ C0] __asan_report_load8_noabort+0x14/0x20 [ 77.833104][ C0] find_match+0xb39/0xc90 [ 77.837409][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 77.842415][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 77.848205][ C0] __find_rr_leaf+0x14e/0x750 [ 77.852867][ C0] ? nexthop_is_blackhole+0x690/0x690 [ 77.858247][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 77.864381][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 77.869383][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 77.875167][ C0] fib6_table_lookup+0x697/0xdb0 [ 77.880093][ C0] ? rt6_age_exceptions+0x130/0x130 [ 77.885309][ C0] ? __kasan_check_read+0x11/0x20 [ 77.890314][ C0] ip6_pol_route+0x1f6/0xa70 [ 77.894886][ C0] ? ip6_pol_route_lookup+0x12e0/0x12e0 [ 77.900451][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 77.905458][ C0] ip6_pol_route_input+0x65/0x80 [ 77.910414][ C0] fib6_rule_lookup+0x133/0x7d0 [ 77.915258][ C0] ? __skb_ext_del+0xb5/0x340 [ 77.919907][ C0] ? lock_downgrade+0x920/0x920 [ 77.924855][ C0] ? ip6_pol_route+0xa70/0xa70 [ 77.929597][ C0] ? fib6_lookup+0x340/0x340 [ 77.934175][ C0] ? br_nf_dev_queue_xmit+0x356/0x14b0 [ 77.939620][ C0] ? br_nf_post_routing+0xd5f/0x1d10 [ 77.944882][ C0] ? br_forward_finish+0x235/0x3f0 [ 77.949972][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 77.955846][ C0] ip6_route_input_lookup+0xb7/0xd0 [ 77.961025][ C0] ip6_route_input+0x5f0/0xa40 [ 77.965763][ C0] ? __kasan_check_read+0x11/0x20 [ 77.970790][ C0] ? ip6_route_check_nh+0x670/0x670 [ 77.975972][ C0] ? __kasan_check_read+0x11/0x20 [ 77.980972][ C0] ? mark_lock+0xc2/0x1220 [ 77.985376][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 77.990484][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 77.996273][ C0] ip6_rcv_finish_core.isra.0+0x174/0x590 [ 78.001974][ C0] ip6_rcv_finish+0x17a/0x310 [ 78.006629][ C0] ? ip6_rcv_finish_core.isra.0+0x590/0x590 [ 78.012502][ C0] ip_sabotage_in+0x20d/0x280 [ 78.017156][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 78.022178][ C0] nf_hook_slow+0xbc/0x1e0 [ 78.026579][ C0] ? rcu_dynticks_curr_cpu_in_eqs+0x54/0xb0 [ 78.032559][ C0] ipv6_rcv+0x25d/0x420 [ 78.036697][ C0] ? ip6_rcv_core.isra.0+0x1c30/0x1c30 [ 78.042137][ C0] ? ip6_rcv_finish_core.isra.0+0x590/0x590 [ 78.048023][ C0] ? ip6_rcv_core.isra.0+0x1c30/0x1c30 [ 78.053472][ C0] __netif_receive_skb_one_core+0x113/0x1a0 [ 78.059372][ C0] ? __netif_receive_skb_core+0x30b0/0x30b0 [ 78.065252][ C0] ? lock_acquire+0x190/0x410 [ 78.069964][ C0] ? netif_receive_skb+0xf9/0x990 [ 78.075005][ C0] __netif_receive_skb+0x2c/0x1d0 [ 78.080011][ C0] netif_receive_skb+0x17b/0x990 [ 78.084929][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 78.091061][ C0] ? __netif_receive_skb+0x1d0/0x1d0 [ 78.096324][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 78.101362][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 78.107148][ C0] ? __kasan_check_read+0x11/0x20 [ 78.112153][ C0] br_pass_frame_up+0x43f/0x910 [ 78.116988][ C0] ? br_add_if.cold+0x33/0x33 [ 78.121642][ C0] ? deliver_clone+0x69/0xc0 [ 78.126253][ C0] ? br_pass_frame_up+0x910/0x910 [ 78.131265][ C0] br_handle_frame_finish+0x6e0/0x16c0 [ 78.136708][ C0] ? br_handle_local_finish+0x20/0x20 [ 78.142056][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 78.148220][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 78.153221][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 78.158914][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 78.163485][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 78.168404][ C0] ? br_handle_local_finish+0x20/0x20 [ 78.173761][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 78.178847][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 78.185057][ C0] ? br_handle_local_finish+0x20/0x20 [ 78.190417][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 78.195421][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 78.201208][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 78.207079][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 78.212956][ C0] br_nf_pre_routing_finish_ipv6+0x6fa/0xdb0 [ 78.218914][ C0] ? br_handle_local_finish+0x20/0x20 [ 78.224267][ C0] ? __kasan_check_read+0x11/0x20 [ 78.229275][ C0] br_nf_pre_routing_ipv6+0x456/0x830 [ 78.234625][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 78.239633][ C0] ? br_nf_pre_routing.cold+0x2d/0x2d [ 78.244981][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 78.249984][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 78.256204][ C0] ? skb_pull_rcsum+0x155/0x300 [ 78.261034][ C0] br_nf_pre_routing+0x1896/0x22b3 [ 78.266128][ C0] ? br_nf_pre_routing_finish+0x1790/0x1790 [ 78.272008][ C0] ? br_nf_pre_routing_finish+0x1790/0x1790 [ 78.277879][ C0] br_handle_frame+0x806/0x1340 [ 78.282746][ C0] ? br_handle_frame_finish+0x16c0/0x16c0 [ 78.288442][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 78.294590][ C0] ? br_handle_local_finish+0x20/0x20 [ 78.299963][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 78.305761][ C0] ? __lock_acquire+0x16f2/0x4a00 [ 78.310764][ C0] ? br_handle_frame_finish+0x16c0/0x16c0 [ 78.316461][ C0] __netif_receive_skb_core+0xfbc/0x30b0 [ 78.322071][ C0] ? __kasan_check_read+0x11/0x20 [ 78.327079][ C0] ? __check_heap_object+0xb0/0xb3 [ 78.332176][ C0] ? do_xdp_generic+0x50/0x50 [ 78.336843][ C0] ? __kasan_check_read+0x11/0x20 [ 78.341849][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 78.346780][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 78.352564][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 78.358521][ C0] ? __netif_receive_skb_core+0x30b0/0x30b0 [ 78.364411][ C0] ? lock_acquire+0x190/0x410 [ 78.369062][ C0] ? process_backlog+0x1b5/0x780 [ 78.373990][ C0] __netif_receive_skb+0x2c/0x1d0 [ 78.378995][ C0] process_backlog+0x226/0x780 [ 78.383734][ C0] ? net_rx_action+0x27b/0x1120 [ 78.388562][ C0] ? lockdep_hardirqs_on+0x19e/0x5e0 [ 78.393832][ C0] net_rx_action+0x508/0x1120 [ 78.398491][ C0] ? napi_busy_loop+0x970/0x970 [ 78.403322][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 78.408842][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 78.414801][ C0] ? trace_hardirqs_on+0x67/0x240 [ 78.419806][ C0] __do_softirq+0x262/0x98c [ 78.424294][ C0] ? takeover_tasklets+0x820/0x820 [ 78.429389][ C0] run_ksoftirqd+0x8e/0x110 [ 78.433868][ C0] smpboot_thread_fn+0x6a3/0xa40 [ 78.438823][ C0] ? __smpboot_create_thread.part.0+0x340/0x340 [ 78.445042][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 78.451258][ C0] ? __kthread_parkme+0x108/0x1c0 [ 78.456268][ C0] ? __kasan_check_read+0x11/0x20 [ 78.461279][ C0] kthread+0x361/0x430 [ 78.465334][ C0] ? __smpboot_create_thread.part.0+0x340/0x340 [ 78.471554][ C0] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 78.477259][ C0] ret_from_fork+0x24/0x30 [ 78.481674][ C0] [ 78.483979][ C0] Allocated by task 9657: [ 78.488287][ C0] save_stack+0x23/0x90 [ 78.492419][ C0] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 78.498024][ C0] kasan_kmalloc+0x9/0x10 [ 78.502335][ C0] __kmalloc_node+0x4e/0x70 [ 78.506815][ C0] kvmalloc_node+0x68/0x100 [ 78.511312][ C0] alloc_netdev_mqs+0x98/0xe40 [ 78.516100][ C0] vti6_init_net+0x244/0x810 [ 78.520666][ C0] ops_init+0xb3/0x420 [ 78.524744][ C0] setup_net+0x2d5/0x8b0 [ 78.528963][ C0] copy_net_ns+0x29e/0x5a0 [ 78.533360][ C0] create_new_namespaces+0x403/0xb50 [ 78.538631][ C0] unshare_nsproxy_namespaces+0xc2/0x200 [ 78.544238][ C0] ksys_unshare+0x444/0x980 [ 78.548837][ C0] __x64_sys_unshare+0x31/0x40 [ 78.553587][ C0] do_syscall_64+0xfa/0x790 [ 78.558071][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.563935][ C0] [ 78.566240][ C0] Freed by task 9657: [ 78.570195][ C0] save_stack+0x23/0x90 [ 78.574369][ C0] __kasan_slab_free+0x102/0x150 [ 78.579285][ C0] kasan_slab_free+0xe/0x10 [ 78.583793][ C0] kfree+0x10a/0x2c0 [ 78.587664][ C0] __netdev_name_node_alt_destroy+0x1ff/0x2a0 [ 78.593709][ C0] netdev_name_node_alt_destroy+0x57/0x80 [ 78.599438][ C0] rtnl_linkprop.isra.0+0x575/0x6f0 [ 78.604641][ C0] rtnl_dellinkprop+0x46/0x60 [ 78.609292][ C0] rtnetlink_rcv_msg+0x45e/0xaf0 [ 78.614203][ C0] netlink_rcv_skb+0x177/0x450 [ 78.618938][ C0] rtnetlink_rcv+0x1d/0x30 [ 78.623330][ C0] netlink_unicast+0x59e/0x7e0 [ 78.628074][ C0] netlink_sendmsg+0x91c/0xea0 [ 78.632814][ C0] sock_sendmsg+0xd7/0x130 [ 78.637206][ C0] ____sys_sendmsg+0x753/0x880 [ 78.641944][ C0] ___sys_sendmsg+0x100/0x170 [ 78.646597][ C0] __sys_sendmsg+0x105/0x1d0 [ 78.651163][ C0] __x64_sys_sendmsg+0x78/0xb0 [ 78.655905][ C0] do_syscall_64+0xfa/0x790 [ 78.660390][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.666293][ C0] [ 78.668635][ C0] The buggy address belongs to the object at ffff88809fb74000 [ 78.668635][ C0] which belongs to the cache kmalloc-4k of size 4096 [ 78.682821][ C0] The buggy address is located 800 bytes inside of [ 78.682821][ C0] 4096-byte region [ffff88809fb74000, ffff88809fb75000) [ 78.696158][ C0] The buggy address belongs to the page: [ 78.701781][ C0] page:ffffea00027edd00 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 [ 78.712721][ C0] flags: 0xfffe0000010200(slab|head) [ 78.717986][ C0] raw: 00fffe0000010200 ffffea00023ad708 ffffea00029fee08 ffff8880aa402000 [ 78.726553][ C0] raw: 0000000000000000 ffff88809fb74000 0000000100000001 0000000000000000 [ 78.735114][ C0] page dumped because: kasan: bad access detected [ 78.741497][ C0] [ 78.743802][ C0] Memory state around the buggy address: [ 78.749409][ C0] ffff88809fb74200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.757448][ C0] ffff88809fb74280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.765493][ C0] >ffff88809fb74300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.773527][ C0] ^ [ 78.778615][ C0] ffff88809fb74380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.786657][ C0] ffff88809fb74400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 78.794690][ C0] ========