[ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.90' (ECDSA) to the list of known hosts. 2021/09/02 12:16:18 fuzzer started 2021/09/02 12:16:18 connecting to host at 10.128.0.169:35139 2021/09/02 12:16:18 checking machine... 2021/09/02 12:16:18 checking revisions... 2021/09/02 12:16:18 testing simple program... syzkaller login: [ 73.062844][ T6529] chnl_net:caif_netlink_parms(): no params data found [ 73.155391][ T6529] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.164443][ T6529] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.175381][ T6529] device bridge_slave_0 entered promiscuous mode [ 73.185766][ T6529] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.193196][ T6529] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.201351][ T6529] device bridge_slave_1 entered promiscuous mode [ 73.231047][ T6529] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 73.242031][ T6529] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 73.275860][ T6529] team0: Port device team_slave_0 added [ 73.284025][ T6529] team0: Port device team_slave_1 added [ 73.312625][ T6529] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 73.319889][ T6529] 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. [ 73.345905][ T6529] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 73.358845][ T6529] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 73.365795][ T6529] 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. [ 73.392710][ T6529] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 73.429717][ T6529] device hsr_slave_0 entered promiscuous mode [ 73.437437][ T6529] device hsr_slave_1 entered promiscuous mode [ 73.563387][ T6529] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 73.574886][ T6529] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 73.587893][ T6529] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 73.600638][ T6529] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 73.626548][ T6529] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.633969][ T6529] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.642030][ T6529] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.649307][ T6529] bridge0: port 1(bridge_slave_0) entered forwarding state [ 73.694682][ T6529] 8021q: adding VLAN 0 to HW filter on device bond0 [ 73.707781][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 73.721462][ T7] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.730586][ T7] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.741374][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 73.754428][ T6529] 8021q: adding VLAN 0 to HW filter on device team0 [ 73.766061][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 73.775137][ T1052] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.782709][ T1052] bridge0: port 1(bridge_slave_0) entered forwarding state [ 73.800315][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 73.809340][ T1052] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.816508][ T1052] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.832360][ T2952] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 73.841041][ T2952] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 73.854464][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 73.866526][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 73.878806][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 73.890598][ T6529] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 73.909593][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 73.917148][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 73.933252][ T6529] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 73.952365][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 73.975170][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 73.984103][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 73.992739][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 74.004513][ T6529] device veth0_vlan entered promiscuous mode [ 74.016196][ T6529] device veth1_vlan entered promiscuous mode [ 74.039927][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 74.049441][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 74.062403][ T6529] device veth0_macvtap entered promiscuous mode [ 74.072014][ T6529] device veth1_macvtap entered promiscuous mode [ 74.090845][ T6529] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 74.098821][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 74.106836][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 74.115787][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 74.125178][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 74.142594][ T6529] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 74.150393][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 74.160934][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 74.172911][ T6529] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.182449][ T6529] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.191826][ T6529] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.200778][ T6529] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 74.293849][ T1366] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 74.308820][ T1366] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 74.322328][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 74.361485][ T1366] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 74.372724][ T1366] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 74.389378][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/09/02 12:16:21 building call list... [ 76.680351][ T8] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 executing program [ 77.653643][ T6524] ================================================================== [ 77.662912][ T6524] BUG: KASAN: null-ptr-deref in fuse_conn_put+0x1d7/0x300 [ 77.670020][ T6524] Read of size 4 at addr 0000000000000000 by task syz-fuzzer/6524 [ 77.677982][ T6524] [ 77.680287][ T6524] CPU: 0 PID: 6524 Comm: syz-fuzzer Not tainted 5.14.0-next-20210902-syzkaller #0 [ 77.689463][ T6524] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.699500][ T6524] Call Trace: [ 77.702764][ T6524] dump_stack_lvl+0xcd/0x134 [ 77.707345][ T6524] kasan_report.cold+0x66/0xdf [ 77.712183][ T6524] ? fuse_conn_put+0x1d7/0x300 [ 77.716933][ T6524] kasan_check_range+0x13d/0x180 [ 77.721861][ T6524] fuse_conn_put+0x1d7/0x300 [ 77.726435][ T6524] fuse_dev_free+0x155/0x1f0 [ 77.731011][ T6524] fuse_dev_release+0x2a8/0x3f0 [ 77.735850][ T6524] ? fuse_abort_conn+0xc90/0xc90 [ 77.740774][ T6524] ? cuse_channel_release+0x237/0x300 [ 77.746261][ T6524] __fput+0x288/0x9f0 [ 77.750234][ T6524] ? cuse_class_waiting_show+0xa0/0xa0 [ 77.755696][ T6524] task_work_run+0xdd/0x1a0 [ 77.760201][ T6524] exit_to_user_mode_prepare+0x27e/0x290 [ 77.765830][ T6524] syscall_exit_to_user_mode+0x19/0x60 [ 77.771291][ T6524] do_syscall_64+0x42/0xb0 [ 77.775723][ T6524] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 77.781607][ T6524] RIP: 0033:0x4af19b [ 77.785524][ T6524] 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 [ 77.805117][ T6524] RSP: 002b:000000c0002f5430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 77.813530][ T6524] RAX: 0000000000000000 RBX: 000000c00001c000 RCX: 00000000004af19b [ 77.821503][ T6524] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 77.829473][ T6524] RBP: 000000c0002f5470 R08: 0000000000000001 R09: 0000000000000000 [ 77.837428][ T6524] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014e [ 77.845471][ T6524] R13: 000000000000014d R14: 0000000000000200 R15: 000000c0002e9360 [ 77.853439][ T6524] ================================================================== [ 77.861566][ T6524] Disabling lock debugging due to kernel taint [ 77.868546][ T6524] Kernel panic - not syncing: panic_on_warn set ... [ 77.875169][ T6524] CPU: 1 PID: 6524 Comm: syz-fuzzer Tainted: G B 5.14.0-next-20210902-syzkaller #0 [ 77.885769][ T6524] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.895808][ T6524] Call Trace: [ 77.899074][ T6524] dump_stack_lvl+0xcd/0x134 [ 77.903653][ T6524] panic+0x2b0/0x6dd [ 77.907531][ T6524] ? __warn_printk+0xf3/0xf3 [ 77.912101][ T6524] ? preempt_schedule_common+0x59/0xc0 [ 77.917564][ T6524] ? fuse_conn_put+0x1d7/0x300 [ 77.922392][ T6524] ? preempt_schedule_thunk+0x16/0x18 [ 77.927757][ T6524] ? trace_hardirqs_on+0x38/0x1c0 [ 77.932763][ T6524] ? trace_hardirqs_on+0x51/0x1c0 [ 77.937768][ T6524] ? fuse_conn_put+0x1d7/0x300 [ 77.942513][ T6524] ? fuse_conn_put+0x1d7/0x300 [ 77.947260][ T6524] end_report.cold+0x63/0x6f [ 77.951854][ T6524] kasan_report.cold+0x71/0xdf [ 77.956601][ T6524] ? fuse_conn_put+0x1d7/0x300 [ 77.961348][ T6524] kasan_check_range+0x13d/0x180 [ 77.966268][ T6524] fuse_conn_put+0x1d7/0x300 [ 77.970840][ T6524] fuse_dev_free+0x155/0x1f0 [ 77.975409][ T6524] fuse_dev_release+0x2a8/0x3f0 [ 77.980342][ T6524] ? fuse_abort_conn+0xc90/0xc90 [ 77.985345][ T6524] ? cuse_channel_release+0x237/0x300 [ 77.990710][ T6524] __fput+0x288/0x9f0 [ 77.994676][ T6524] ? cuse_class_waiting_show+0xa0/0xa0 [ 78.000303][ T6524] task_work_run+0xdd/0x1a0 [ 78.004788][ T6524] exit_to_user_mode_prepare+0x27e/0x290 [ 78.010417][ T6524] syscall_exit_to_user_mode+0x19/0x60 [ 78.015880][ T6524] do_syscall_64+0x42/0xb0 [ 78.020558][ T6524] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 78.026452][ T6524] RIP: 0033:0x4af19b [ 78.030419][ T6524] 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 [ 78.050397][ T6524] RSP: 002b:000000c0002f5430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 78.058806][ T6524] RAX: 0000000000000000 RBX: 000000c00001c000 RCX: 00000000004af19b [ 78.066901][ T6524] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 78.074851][ T6524] RBP: 000000c0002f5470 R08: 0000000000000001 R09: 0000000000000000 [ 78.082802][ T6524] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014e [ 78.090840][ T6524] R13: 000000000000014d R14: 0000000000000200 R15: 000000c0002e9360 [ 78.100531][ T6524] Kernel Offset: disabled [ 78.104857][ T6524] Rebooting in 86400 seconds..