[ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. Starting Load/Save RF Kill Switch Status... [ OK ] Started Getty on tty1. [ 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... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts. 2021/09/02 10:18:45 fuzzer started 2021/09/02 10:18:45 connecting to host at 10.128.0.169:36987 2021/09/02 10:18:45 checking machine... 2021/09/02 10:18:45 checking revisions... 2021/09/02 10:18:45 testing simple program... syzkaller login: [ 73.248540][ T6542] chnl_net:caif_netlink_parms(): no params data found [ 73.363021][ T6542] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.370149][ T6542] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.380054][ T6542] device bridge_slave_0 entered promiscuous mode [ 73.390550][ T6542] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.399662][ T6542] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.408597][ T6542] device bridge_slave_1 entered promiscuous mode [ 73.443928][ T6542] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 73.458005][ T6542] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 73.497708][ T6542] team0: Port device team_slave_0 added [ 73.509684][ T6542] team0: Port device team_slave_1 added [ 73.541346][ T6542] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 73.548961][ T6542] 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. [ 73.575648][ T6542] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 73.589191][ T6542] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 73.596616][ T6542] 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. [ 73.623375][ T6542] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 73.662834][ T6542] device hsr_slave_0 entered promiscuous mode [ 73.669653][ T6542] device hsr_slave_1 entered promiscuous mode [ 73.799503][ T6542] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 73.811085][ T6542] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 73.824317][ T6542] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 73.835436][ T6542] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 73.864282][ T6542] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.871694][ T6542] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.879551][ T6542] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.886676][ T6542] bridge0: port 1(bridge_slave_0) entered forwarding state [ 73.930000][ T6542] 8021q: adding VLAN 0 to HW filter on device bond0 [ 73.945832][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 73.958224][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.967855][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.977848][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 73.992249][ T6542] 8021q: adding VLAN 0 to HW filter on device team0 [ 74.004575][ T1266] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 74.013042][ T1266] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.020076][ T1266] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.033887][ T2984] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 74.042694][ T2984] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.049863][ T2984] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.074001][ T2984] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 74.083363][ T2984] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 74.100589][ T6542] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 74.112386][ T6542] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 74.125341][ T2984] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 74.134103][ T2984] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 74.144150][ T2984] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 74.153386][ T2984] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 74.177045][ T6542] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 74.185032][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 74.194907][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 74.217300][ T6874] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 74.237559][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 74.246160][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 74.258685][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 74.267648][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 74.276856][ T6542] device veth0_vlan entered promiscuous mode [ 74.290983][ T6542] device veth1_vlan entered promiscuous mode [ 74.316852][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 74.325448][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 74.334645][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 74.344003][ T31] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 74.356211][ T6542] device veth0_macvtap entered promiscuous mode [ 74.366601][ T6542] device veth1_macvtap entered promiscuous mode [ 74.384834][ T6542] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 74.392920][ T6875] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 74.402564][ T6875] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 74.410509][ T6875] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 74.420683][ T6875] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 74.433506][ T6542] batman_adv: batadv0: Interface activated: batadv_slave_1 executing program [ 74.441936][ T6875] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 74.450587][ T6875] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 74.464548][ T6542] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.473586][ T6542] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.483790][ T6542] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.492851][ T6542] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.581817][ T8] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 74.589911][ T8] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 74.625239][ T469] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 74.644488][ T6874] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 74.646088][ T469] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 74.666566][ T6874] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/09/02 10:18:48 building call list... [ 77.103646][ T469] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 executing program [ 77.648002][ T6542] syz-executor.0 (6542) used greatest stack depth: 22160 bytes left [ 77.841177][ T6908] ================================================================== [ 77.849596][ T6908] BUG: KASAN: null-ptr-deref in fuse_conn_put+0x1d7/0x300 [ 77.856702][ T6908] Read of size 4 at addr 0000000000000000 by task syz-fuzzer/6908 [ 77.864499][ T6908] [ 77.867155][ T6908] CPU: 0 PID: 6908 Comm: syz-fuzzer Not tainted 5.14.0-next-20210902-syzkaller #0 [ 77.876514][ T6908] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.886751][ T6908] Call Trace: [ 77.890070][ T6908] dump_stack_lvl+0xcd/0x134 [ 77.894958][ T6908] kasan_report.cold+0x66/0xdf [ 77.899729][ T6908] ? fuse_conn_put+0x1d7/0x300 [ 77.904761][ T6908] kasan_check_range+0x13d/0x180 [ 77.909695][ T6908] fuse_conn_put+0x1d7/0x300 [ 77.914292][ T6908] fuse_dev_free+0x155/0x1f0 [ 77.918979][ T6908] fuse_dev_release+0x2a8/0x3f0 [ 77.923851][ T6908] ? fuse_abort_conn+0xc90/0xc90 [ 77.928888][ T6908] ? cuse_channel_release+0x237/0x300 [ 77.934272][ T6908] __fput+0x288/0x9f0 [ 77.938424][ T6908] ? cuse_class_waiting_show+0xa0/0xa0 [ 77.943889][ T6908] task_work_run+0xdd/0x1a0 [ 77.948387][ T6908] exit_to_user_mode_prepare+0x27e/0x290 [ 77.954636][ T6908] syscall_exit_to_user_mode+0x19/0x60 [ 77.960188][ T6908] do_syscall_64+0x42/0xb0 [ 77.964769][ T6908] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 77.970823][ T6908] RIP: 0033:0x4af19b [ 77.974759][ T6908] 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 [ 77.995085][ T6908] RSP: 002b:000000c000171430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 78.003586][ T6908] RAX: 0000000000000000 RBX: 000000c00001c000 RCX: 00000000004af19b [ 78.011559][ T6908] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 78.019556][ T6908] RBP: 000000c000171470 R08: 0000000000000001 R09: 0000000000000000 [ 78.027528][ T6908] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014d [ 78.035494][ T6908] R13: 000000000000014c R14: 0000000000000200 R15: 000000c00043c140 [ 78.043477][ T6908] ================================================================== [ 78.051932][ T6908] Disabling lock debugging due to kernel taint [ 78.069007][ T6908] Kernel panic - not syncing: panic_on_warn set ... [ 78.075648][ T6908] CPU: 0 PID: 6908 Comm: syz-fuzzer Tainted: G B 5.14.0-next-20210902-syzkaller #0 [ 78.086369][ T6908] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.096434][ T6908] Call Trace: [ 78.099724][ T6908] dump_stack_lvl+0xcd/0x134 [ 78.104334][ T6908] panic+0x2b0/0x6dd [ 78.108357][ T6908] ? __warn_printk+0xf3/0xf3 [ 78.112965][ T6908] ? preempt_schedule_common+0x59/0xc0 [ 78.118432][ T6908] ? fuse_conn_put+0x1d7/0x300 [ 78.123214][ T6908] ? preempt_schedule_thunk+0x16/0x18 [ 78.128611][ T6908] ? trace_hardirqs_on+0x38/0x1c0 [ 78.133646][ T6908] ? trace_hardirqs_on+0x51/0x1c0 [ 78.138681][ T6908] ? fuse_conn_put+0x1d7/0x300 [ 78.143457][ T6908] ? fuse_conn_put+0x1d7/0x300 [ 78.148225][ T6908] end_report.cold+0x63/0x6f [ 78.152827][ T6908] kasan_report.cold+0x71/0xdf [ 78.157603][ T6908] ? fuse_conn_put+0x1d7/0x300 [ 78.162374][ T6908] kasan_check_range+0x13d/0x180 [ 78.167311][ T6908] fuse_conn_put+0x1d7/0x300 [ 78.171914][ T6908] fuse_dev_free+0x155/0x1f0 [ 78.176503][ T6908] fuse_dev_release+0x2a8/0x3f0 [ 78.181359][ T6908] ? fuse_abort_conn+0xc90/0xc90 [ 78.186310][ T6908] ? cuse_channel_release+0x237/0x300 [ 78.191720][ T6908] __fput+0x288/0x9f0 [ 78.195730][ T6908] ? cuse_class_waiting_show+0xa0/0xa0 [ 78.201290][ T6908] task_work_run+0xdd/0x1a0 [ 78.205907][ T6908] exit_to_user_mode_prepare+0x27e/0x290 [ 78.211540][ T6908] syscall_exit_to_user_mode+0x19/0x60 [ 78.217364][ T6908] do_syscall_64+0x42/0xb0 [ 78.221788][ T6908] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 78.227685][ T6908] RIP: 0033:0x4af19b [ 78.231571][ T6908] 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 [ 78.251354][ T6908] RSP: 002b:000000c000171430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 78.259772][ T6908] RAX: 0000000000000000 RBX: 000000c00001c000 RCX: 00000000004af19b [ 78.267829][ T6908] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 78.276141][ T6908] RBP: 000000c000171470 R08: 0000000000000001 R09: 0000000000000000 [ 78.284456][ T6908] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014d [ 78.292590][ T6908] R13: 000000000000014c R14: 0000000000000200 R15: 000000c00043c140 [ 78.302196][ T6908] Kernel Offset: disabled [ 78.306507][ T6908] Rebooting in 86400 seconds..