[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty1. [ OK ] Started Getty on tty2. [ 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 Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. 2021/09/02 10:18:44 fuzzer started 2021/09/02 10:18:44 connecting to host at 10.128.0.169:33909 2021/09/02 10:18:44 checking machine... 2021/09/02 10:18:44 checking revisions... 2021/09/02 10:18:44 testing simple program... syzkaller login: [ 72.321000][ T6550] chnl_net:caif_netlink_parms(): no params data found [ 72.419280][ T6550] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.427906][ T6550] bridge0: port 1(bridge_slave_0) entered disabled state [ 72.436102][ T6550] device bridge_slave_0 entered promiscuous mode [ 72.446697][ T6550] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.453928][ T6550] bridge0: port 2(bridge_slave_1) entered disabled state [ 72.462282][ T6550] device bridge_slave_1 entered promiscuous mode [ 72.491561][ T6550] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 72.502866][ T6550] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 72.541475][ T6550] team0: Port device team_slave_0 added [ 72.548930][ T6550] team0: Port device team_slave_1 added [ 72.576357][ T6550] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 72.583704][ T6550] 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. [ 72.613282][ T6550] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 72.626636][ T6550] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 72.635685][ T6550] 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. [ 72.663478][ T6550] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 72.701304][ T6550] device hsr_slave_0 entered promiscuous mode [ 72.709344][ T6550] device hsr_slave_1 entered promiscuous mode [ 72.836447][ T6550] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 72.850063][ T6550] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 72.859975][ T6550] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 72.871788][ T6550] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 72.898557][ T6550] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.905719][ T6550] bridge0: port 2(bridge_slave_1) entered forwarding state [ 72.913541][ T6550] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.920807][ T6550] bridge0: port 1(bridge_slave_0) entered forwarding state [ 72.964522][ T6550] 8021q: adding VLAN 0 to HW filter on device bond0 [ 72.979753][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 72.992171][ T20] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.001455][ T20] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.010575][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 73.023737][ T6550] 8021q: adding VLAN 0 to HW filter on device team0 [ 73.035744][ T1051] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 73.045539][ T1051] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.052806][ T1051] bridge0: port 1(bridge_slave_0) entered forwarding state [ 73.069049][ T1051] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 73.079392][ T1051] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.086649][ T1051] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.111090][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 73.120236][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 73.129651][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 73.144241][ T1266] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 73.158416][ T6550] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 73.170815][ T6550] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 73.181259][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 73.204331][ T6550] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 73.212116][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 73.219708][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 73.239685][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 73.260623][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 73.269595][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 73.277703][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 73.289624][ T6550] device veth0_vlan entered promiscuous mode [ 73.303105][ T6550] device veth1_vlan entered promiscuous mode [ 73.326580][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 73.335121][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 73.349031][ T6550] device veth0_macvtap entered promiscuous mode [ 73.361520][ T6550] device veth1_macvtap entered promiscuous mode [ 73.379702][ T6550] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 73.387350][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 73.395468][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 73.405154][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 73.414173][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 73.426337][ T6550] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 73.434354][ T2950] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 73.443449][ T2950] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 73.455012][ T6550] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.464348][ T6550] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.476351][ T6550] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.488497][ T6550] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 73.585507][ T159] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 73.595483][ T159] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 73.624800][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 73.642078][ T159] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 73.650881][ T159] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 73.663674][ T6883] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/09/02 10:18:47 building call list... [ 76.052749][ T8] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 executing program [ 76.876064][ T6547] ================================================================== [ 76.884435][ T6547] BUG: KASAN: null-ptr-deref in fuse_conn_put+0x1d7/0x300 [ 76.891630][ T6547] Read of size 4 at addr 0000000000000000 by task syz-fuzzer/6547 [ 76.899641][ T6547] [ 76.902042][ T6547] CPU: 0 PID: 6547 Comm: syz-fuzzer Not tainted 5.14.0-next-20210902-syzkaller #0 [ 76.911655][ T6547] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.921804][ T6547] Call Trace: [ 76.925169][ T6547] dump_stack_lvl+0xcd/0x134 [ 76.929756][ T6547] kasan_report.cold+0x66/0xdf [ 76.934513][ T6547] ? fuse_conn_put+0x1d7/0x300 [ 76.939268][ T6547] kasan_check_range+0x13d/0x180 [ 76.944291][ T6547] fuse_conn_put+0x1d7/0x300 [ 76.948883][ T6547] fuse_dev_free+0x155/0x1f0 [ 76.953736][ T6547] fuse_dev_release+0x2a8/0x3f0 [ 76.958743][ T6547] ? fuse_abort_conn+0xc90/0xc90 [ 76.963871][ T6547] ? cuse_channel_release+0x237/0x300 [ 76.969302][ T6547] __fput+0x288/0x9f0 [ 76.973306][ T6547] ? cuse_class_waiting_show+0xa0/0xa0 [ 76.978868][ T6547] task_work_run+0xdd/0x1a0 [ 76.983553][ T6547] exit_to_user_mode_prepare+0x27e/0x290 [ 76.989283][ T6547] syscall_exit_to_user_mode+0x19/0x60 [ 76.994784][ T6547] do_syscall_64+0x42/0xb0 [ 76.999464][ T6547] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 77.005567][ T6547] RIP: 0033:0x4af19b [ 77.009465][ T6547] 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 [ 77.029342][ T6547] RSP: 002b:000000c0002d9430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 77.037799][ T6547] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 77.045772][ T6547] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 77.053753][ T6547] RBP: 000000c0002d9470 R08: 0000000000000001 R09: 0000000000000000 [ 77.061710][ T6547] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000111 [ 77.069669][ T6547] R13: 0000000000000110 R14: 0000000000000200 R15: 000000c0004d4280 [ 77.077723][ T6547] ================================================================== [ 77.085954][ T6547] Disabling lock debugging due to kernel taint [ 77.093425][ T6547] Kernel panic - not syncing: panic_on_warn set ... [ 77.100120][ T6547] CPU: 0 PID: 6547 Comm: syz-fuzzer Tainted: G B 5.14.0-next-20210902-syzkaller #0 [ 77.110714][ T6547] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.120853][ T6547] Call Trace: [ 77.124121][ T6547] dump_stack_lvl+0xcd/0x134 [ 77.128717][ T6547] panic+0x2b0/0x6dd [ 77.132611][ T6547] ? __warn_printk+0xf3/0xf3 [ 77.137200][ T6547] ? preempt_schedule_common+0x59/0xc0 [ 77.142763][ T6547] ? fuse_conn_put+0x1d7/0x300 [ 77.147700][ T6547] ? preempt_schedule_thunk+0x16/0x18 [ 77.153079][ T6547] ? trace_hardirqs_on+0x38/0x1c0 [ 77.158105][ T6547] ? trace_hardirqs_on+0x51/0x1c0 [ 77.163143][ T6547] ? fuse_conn_put+0x1d7/0x300 [ 77.167917][ T6547] ? fuse_conn_put+0x1d7/0x300 [ 77.172678][ T6547] end_report.cold+0x63/0x6f [ 77.177271][ T6547] kasan_report.cold+0x71/0xdf [ 77.182034][ T6547] ? fuse_conn_put+0x1d7/0x300 [ 77.186805][ T6547] kasan_check_range+0x13d/0x180 [ 77.191739][ T6547] fuse_conn_put+0x1d7/0x300 [ 77.196412][ T6547] fuse_dev_free+0x155/0x1f0 [ 77.201003][ T6547] fuse_dev_release+0x2a8/0x3f0 [ 77.205853][ T6547] ? fuse_abort_conn+0xc90/0xc90 [ 77.210846][ T6547] ? cuse_channel_release+0x237/0x300 [ 77.216215][ T6547] __fput+0x288/0x9f0 [ 77.220200][ T6547] ? cuse_class_waiting_show+0xa0/0xa0 [ 77.225660][ T6547] task_work_run+0xdd/0x1a0 [ 77.230180][ T6547] exit_to_user_mode_prepare+0x27e/0x290 [ 77.236075][ T6547] syscall_exit_to_user_mode+0x19/0x60 [ 77.241535][ T6547] do_syscall_64+0x42/0xb0 [ 77.245967][ T6547] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 77.251866][ T6547] RIP: 0033:0x4af19b [ 77.255751][ T6547] 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 [ 77.275465][ T6547] RSP: 002b:000000c0002d9430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 77.283873][ T6547] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 77.291835][ T6547] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 77.299792][ T6547] RBP: 000000c0002d9470 R08: 0000000000000001 R09: 0000000000000000 [ 77.307751][ T6547] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000111 [ 77.315725][ T6547] R13: 0000000000000110 R14: 0000000000000200 R15: 000000c0004d4280 [ 77.325282][ T6547] Kernel Offset: disabled [ 77.329600][ T6547] Rebooting in 86400 seconds..