[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.245' (ECDSA) to the list of known hosts. 2021/09/06 08:53:03 fuzzer started 2021/09/06 08:53:04 connecting to host at 10.128.0.169:42067 2021/09/06 08:53:04 checking machine... 2021/09/06 08:53:04 checking revisions... 2021/09/06 08:53:04 testing simple program... syzkaller login: [ 73.460169][ T6546] chnl_net:caif_netlink_parms(): no params data found [ 73.536436][ T6546] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.545104][ T6546] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.553122][ T6546] device bridge_slave_0 entered promiscuous mode [ 73.566204][ T6546] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.573780][ T6546] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.582586][ T6546] device bridge_slave_1 entered promiscuous mode [ 73.618179][ T6546] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 73.630278][ T6546] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 73.666328][ T6546] team0: Port device team_slave_0 added [ 73.676033][ T6546] team0: Port device team_slave_1 added [ 73.706847][ T6546] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 73.713806][ T6546] 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. [ 73.740754][ T6546] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 73.755261][ T6546] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 73.762212][ T6546] 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. [ 73.788742][ T6546] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 73.826892][ T6546] device hsr_slave_0 entered promiscuous mode [ 73.833559][ T6546] device hsr_slave_1 entered promiscuous mode [ 73.959423][ T6546] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 73.970291][ T6546] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 73.981875][ T6546] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 73.992691][ T6546] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 74.020205][ T6546] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.027551][ T6546] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.035737][ T6546] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.042945][ T6546] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.092393][ T6546] 8021q: adding VLAN 0 to HW filter on device bond0 [ 74.106901][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 74.119266][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.129202][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.137865][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 74.151501][ T6546] 8021q: adding VLAN 0 to HW filter on device team0 [ 74.164083][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 74.172683][ T25] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.179972][ T25] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.192372][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 74.201169][ T25] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.208384][ T25] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.237319][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 74.246320][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 74.256433][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 74.265645][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 74.274142][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 74.287250][ T6546] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 74.305686][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 74.313146][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 74.327853][ T6546] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 74.348124][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 74.370545][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 74.379856][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 74.389017][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 74.400476][ T6546] device veth0_vlan entered promiscuous mode [ 74.414996][ T6546] device veth1_vlan entered promiscuous mode [ 74.438839][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 74.447554][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 74.456548][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 74.468369][ T6546] device veth0_macvtap entered promiscuous mode [ 74.480574][ T6546] device veth1_macvtap entered promiscuous mode [ 74.499288][ T6546] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 74.508086][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 74.518283][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 74.530805][ T6546] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 74.539051][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 74.547787][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 74.559555][ T6546] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.569806][ T6546] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.581797][ T6546] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.592481][ T6546] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.691227][ T1213] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 74.710205][ T1213] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 executing program [ 74.736761][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 74.750867][ T1213] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 74.759531][ T1213] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 74.769547][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/09/06 08:53:07 building call list... [ 77.266794][ T165] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 executing program [ 77.944671][ T6538] ================================================================== [ 77.953674][ T6538] BUG: KASAN: null-ptr-deref in fuse_conn_put+0x1d7/0x300 [ 77.960998][ T6538] Read of size 4 at addr 0000000000000000 by task syz-fuzzer/6538 [ 77.969161][ T6538] [ 77.971480][ T6538] CPU: 1 PID: 6538 Comm: syz-fuzzer Not tainted 5.14.0-next-20210906-syzkaller #0 [ 77.980834][ T6538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.992275][ T6538] Call Trace: [ 77.995604][ T6538] dump_stack_lvl+0xcd/0x134 [ 78.000322][ T6538] kasan_report.cold+0x66/0xdf [ 78.005652][ T6538] ? fuse_conn_put+0x1d7/0x300 [ 78.010498][ T6538] kasan_check_range+0x13d/0x180 [ 78.015431][ T6538] fuse_conn_put+0x1d7/0x300 [ 78.020026][ T6538] fuse_dev_free+0x155/0x1f0 [ 78.024623][ T6538] fuse_dev_release+0x2a8/0x3f0 [ 78.029570][ T6538] ? fuse_abort_conn+0xc90/0xc90 [ 78.034673][ T6538] ? cuse_channel_release+0x237/0x300 [ 78.040517][ T6538] __fput+0x288/0x9f0 [ 78.044952][ T6538] ? cuse_class_waiting_show+0xa0/0xa0 [ 78.050504][ T6538] task_work_run+0xdd/0x1a0 [ 78.055004][ T6538] exit_to_user_mode_prepare+0x27e/0x290 [ 78.060640][ T6538] syscall_exit_to_user_mode+0x19/0x60 [ 78.066285][ T6538] do_syscall_64+0x42/0xb0 [ 78.070750][ T6538] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 78.076644][ T6538] RIP: 0033:0x4af19b [ 78.080542][ T6538] Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 78.100491][ T6538] RSP: 002b:000000c0004eb430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 78.109178][ T6538] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 78.118112][ T6538] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 78.126525][ T6538] RBP: 000000c0004eb470 R08: 0000000000000001 R09: 0000000000000000 [ 78.134586][ T6538] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014c [ 78.142645][ T6538] R13: 000000000000014b R14: 0000000000000200 R15: 000000c0001d1540 [ 78.150994][ T6538] ================================================================== [ 78.159138][ T6538] Disabling lock debugging due to kernel taint [ 78.166500][ T6538] Kernel panic - not syncing: panic_on_warn set ... [ 78.173108][ T6538] CPU: 0 PID: 6538 Comm: syz-fuzzer Tainted: G B 5.14.0-next-20210906-syzkaller #0 [ 78.183840][ T6538] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.194089][ T6538] Call Trace: [ 78.197364][ T6538] dump_stack_lvl+0xcd/0x134 [ 78.201980][ T6538] panic+0x2b0/0x6dd [ 78.205880][ T6538] ? __warn_printk+0xf3/0xf3 [ 78.210476][ T6538] ? preempt_schedule_common+0x59/0xc0 [ 78.215957][ T6538] ? fuse_conn_put+0x1d7/0x300 [ 78.220820][ T6538] ? preempt_schedule_thunk+0x16/0x18 [ 78.226195][ T6538] ? trace_hardirqs_on+0x38/0x1c0 [ 78.231219][ T6538] ? trace_hardirqs_on+0x51/0x1c0 [ 78.236248][ T6538] ? fuse_conn_put+0x1d7/0x300 [ 78.241007][ T6538] ? fuse_conn_put+0x1d7/0x300 [ 78.245771][ T6538] end_report.cold+0x63/0x6f [ 78.250370][ T6538] kasan_report.cold+0x71/0xdf [ 78.255225][ T6538] ? fuse_conn_put+0x1d7/0x300 [ 78.260073][ T6538] kasan_check_range+0x13d/0x180 [ 78.265201][ T6538] fuse_conn_put+0x1d7/0x300 [ 78.269940][ T6538] fuse_dev_free+0x155/0x1f0 [ 78.274550][ T6538] fuse_dev_release+0x2a8/0x3f0 [ 78.279577][ T6538] ? fuse_abort_conn+0xc90/0xc90 [ 78.284964][ T6538] ? cuse_channel_release+0x237/0x300 [ 78.290341][ T6538] __fput+0x288/0x9f0 [ 78.294323][ T6538] ? cuse_class_waiting_show+0xa0/0xa0 [ 78.299957][ T6538] task_work_run+0xdd/0x1a0 [ 78.304462][ T6538] exit_to_user_mode_prepare+0x27e/0x290 [ 78.310107][ T6538] syscall_exit_to_user_mode+0x19/0x60 [ 78.315653][ T6538] do_syscall_64+0x42/0xb0 [ 78.320240][ T6538] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 78.326147][ T6538] RIP: 0033:0x4af19b [ 78.330031][ T6538] Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 78.349632][ T6538] RSP: 002b:000000c0004eb430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 78.358064][ T6538] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 78.366208][ T6538] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 78.374431][ T6538] RBP: 000000c0004eb470 R08: 0000000000000001 R09: 0000000000000000 [ 78.382478][ T6538] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014c [ 78.390445][ T6538] R13: 000000000000014b R14: 0000000000000200 R15: 000000c0001d1540 [ 78.400173][ T6538] Kernel Offset: disabled [ 78.404672][ T6538] Rebooting in 86400 seconds..