Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.86' (ECDSA) to the list of known hosts. 2021/09/02 10:18:42 fuzzer started 2021/09/02 10:18:42 connecting to host at 10.128.0.169:37791 2021/09/02 10:18:42 checking machine... 2021/09/02 10:18:42 checking revisions... 2021/09/02 10:18:42 testing simple program... syzkaller login: [ 72.295155][ T6579] chnl_net:caif_netlink_parms(): no params data found [ 72.369972][ T6579] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.379810][ T6579] bridge0: port 1(bridge_slave_0) entered disabled state [ 72.389241][ T6579] device bridge_slave_0 entered promiscuous mode [ 72.399838][ T6579] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.406998][ T6579] bridge0: port 2(bridge_slave_1) entered disabled state [ 72.417108][ T6579] device bridge_slave_1 entered promiscuous mode [ 72.451034][ T6579] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 72.462131][ T6579] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 72.497391][ T6579] team0: Port device team_slave_0 added [ 72.505085][ T6579] team0: Port device team_slave_1 added [ 72.531575][ T6579] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 72.538608][ T6579] 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. [ 72.565464][ T6579] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 72.579288][ T6579] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 72.586443][ T6579] 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. [ 72.613196][ T6579] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 72.650324][ T6579] device hsr_slave_0 entered promiscuous mode [ 72.658640][ T6579] device hsr_slave_1 entered promiscuous mode [ 72.781471][ T6579] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 72.792164][ T6579] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 72.803552][ T6579] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 72.813971][ T6579] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 72.855439][ T6579] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.862813][ T6579] bridge0: port 2(bridge_slave_1) entered forwarding state [ 72.870727][ T6579] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.877908][ T6579] bridge0: port 1(bridge_slave_0) entered forwarding state [ 72.923121][ T6579] 8021q: adding VLAN 0 to HW filter on device bond0 [ 72.936603][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 72.949511][ T6273] bridge0: port 1(bridge_slave_0) entered disabled state [ 72.960082][ T6273] bridge0: port 2(bridge_slave_1) entered disabled state [ 72.970306][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 72.984304][ T6579] 8021q: adding VLAN 0 to HW filter on device team0 [ 72.996462][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 73.005091][ T6273] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.012330][ T6273] bridge0: port 1(bridge_slave_0) entered forwarding state [ 73.024235][ T2952] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 73.033418][ T2952] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.040570][ T2952] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.061037][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 73.078719][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 73.086687][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 73.096687][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 73.111662][ T38] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 73.122499][ T6579] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 73.141431][ T38] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 73.149060][ T38] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 73.163663][ T6579] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 73.188314][ T38] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 73.205555][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 73.215033][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 73.224240][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 73.235436][ T6579] device veth0_vlan entered promiscuous mode [ 73.248828][ T6579] device veth1_vlan entered promiscuous mode [ 73.272159][ T38] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 73.280888][ T38] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 73.289784][ T38] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 73.303570][ T6579] device veth0_macvtap entered promiscuous mode [ 73.314904][ T6579] device veth1_macvtap entered promiscuous mode [ 73.332197][ T6579] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 73.341019][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 73.350492][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 73.363212][ T6579] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 73.371393][ T2952] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 73.381202][ T2952] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 73.400187][ T6579] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.409516][ T6579] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.424443][ T6579] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.435562][ T6579] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 73.536421][ T149] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 73.547265][ T149] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 73.580993][ T6273] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 73.592476][ T1229] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 73.602584][ T1229] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 73.612267][ T38] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/09/02 10:18:45 building call list... [ 76.010873][ T10] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 [ 76.310648][ T6579] syz-executor.0 (6579) used greatest stack depth: 22400 bytes left executing program [ 76.989329][ T6938] ================================================================== [ 76.997629][ T6938] BUG: KASAN: null-ptr-deref in fuse_conn_put+0x1d7/0x300 [ 77.004753][ T6938] Read of size 4 at addr 0000000000000000 by task syz-fuzzer/6938 [ 77.012652][ T6938] [ 77.014972][ T6938] CPU: 1 PID: 6938 Comm: syz-fuzzer Not tainted 5.14.0-next-20210902-syzkaller #0 [ 77.024197][ T6938] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.034260][ T6938] Call Trace: [ 77.037538][ T6938] dump_stack_lvl+0xcd/0x134 [ 77.042152][ T6938] kasan_report.cold+0x66/0xdf [ 77.046931][ T6938] ? fuse_conn_put+0x1d7/0x300 [ 77.051977][ T6938] kasan_check_range+0x13d/0x180 [ 77.057018][ T6938] fuse_conn_put+0x1d7/0x300 [ 77.061711][ T6938] fuse_dev_free+0x155/0x1f0 [ 77.066310][ T6938] fuse_dev_release+0x2a8/0x3f0 [ 77.071205][ T6938] ? fuse_abort_conn+0xc90/0xc90 [ 77.076166][ T6938] ? cuse_channel_release+0x237/0x300 [ 77.081665][ T6938] __fput+0x288/0x9f0 [ 77.085759][ T6938] ? cuse_class_waiting_show+0xa0/0xa0 [ 77.091248][ T6938] task_work_run+0xdd/0x1a0 [ 77.095778][ T6938] exit_to_user_mode_prepare+0x27e/0x290 [ 77.101428][ T6938] syscall_exit_to_user_mode+0x19/0x60 [ 77.107216][ T6938] do_syscall_64+0x42/0xb0 [ 77.111807][ T6938] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 77.117877][ T6938] RIP: 0033:0x4af19b [ 77.121765][ T6938] 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 [ 77.141816][ T6938] RSP: 002b:000000c0001fd430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 77.150228][ T6938] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 77.158846][ T6938] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 77.166829][ T6938] RBP: 000000c0001fd470 R08: 0000000000000001 R09: 0000000000000000 [ 77.174886][ T6938] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014e [ 77.183279][ T6938] R13: 000000000000014d R14: 0000000000000200 R15: 000000c0001df680 [ 77.191277][ T6938] ================================================================== [ 77.199385][ T6938] Disabling lock debugging due to kernel taint [ 77.206675][ T6938] Kernel panic - not syncing: panic_on_warn set ... [ 77.213403][ T6938] CPU: 1 PID: 6938 Comm: syz-fuzzer Tainted: G B 5.14.0-next-20210902-syzkaller #0 [ 77.224168][ T6938] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.235454][ T6938] Call Trace: [ 77.238812][ T6938] dump_stack_lvl+0xcd/0x134 [ 77.243407][ T6938] panic+0x2b0/0x6dd [ 77.247586][ T6938] ? __warn_printk+0xf3/0xf3 [ 77.252175][ T6938] ? preempt_schedule_common+0x59/0xc0 [ 77.257641][ T6938] ? fuse_conn_put+0x1d7/0x300 [ 77.262486][ T6938] ? preempt_schedule_thunk+0x16/0x18 [ 77.267860][ T6938] ? trace_hardirqs_on+0x38/0x1c0 [ 77.272968][ T6938] ? trace_hardirqs_on+0x51/0x1c0 [ 77.277995][ T6938] ? fuse_conn_put+0x1d7/0x300 [ 77.283535][ T6938] ? fuse_conn_put+0x1d7/0x300 [ 77.288291][ T6938] end_report.cold+0x63/0x6f [ 77.292878][ T6938] kasan_report.cold+0x71/0xdf [ 77.297731][ T6938] ? fuse_conn_put+0x1d7/0x300 [ 77.302543][ T6938] kasan_check_range+0x13d/0x180 [ 77.307482][ T6938] fuse_conn_put+0x1d7/0x300 [ 77.312078][ T6938] fuse_dev_free+0x155/0x1f0 [ 77.316667][ T6938] fuse_dev_release+0x2a8/0x3f0 [ 77.321519][ T6938] ? fuse_abort_conn+0xc90/0xc90 [ 77.326452][ T6938] ? cuse_channel_release+0x237/0x300 [ 77.331822][ T6938] __fput+0x288/0x9f0 [ 77.335973][ T6938] ? cuse_class_waiting_show+0xa0/0xa0 [ 77.341515][ T6938] task_work_run+0xdd/0x1a0 [ 77.346025][ T6938] exit_to_user_mode_prepare+0x27e/0x290 [ 77.351659][ T6938] syscall_exit_to_user_mode+0x19/0x60 [ 77.358939][ T6938] do_syscall_64+0x42/0xb0 [ 77.363352][ T6938] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 77.369256][ T6938] RIP: 0033:0x4af19b [ 77.373139][ T6938] 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 [ 77.392839][ T6938] RSP: 002b:000000c0001fd430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 77.401343][ T6938] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 77.409304][ T6938] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 77.417262][ T6938] RBP: 000000c0001fd470 R08: 0000000000000001 R09: 0000000000000000 [ 77.425329][ T6938] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014e [ 77.433289][ T6938] R13: 000000000000014d R14: 0000000000000200 R15: 000000c0001df680 [ 77.442976][ T6938] Kernel Offset: disabled [ 77.447572][ T6938] Rebooting in 86400 seconds..