[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. 2021/09/06 14:02:51 fuzzer started 2021/09/06 14:02:51 connecting to host at 10.128.0.169:36965 2021/09/06 14:02:51 checking machine... 2021/09/06 14:02:51 checking revisions... 2021/09/06 14:02:51 testing simple program... syzkaller login: [ 74.678833][ T6566] chnl_net:caif_netlink_parms(): no params data found [ 74.778306][ T6566] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.786468][ T6566] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.796412][ T6566] device bridge_slave_0 entered promiscuous mode [ 74.806177][ T6566] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.816714][ T6566] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.826012][ T6566] device bridge_slave_1 entered promiscuous mode [ 74.859245][ T6566] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 74.870283][ T6566] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 74.904759][ T6566] team0: Port device team_slave_0 added [ 74.912696][ T6566] team0: Port device team_slave_1 added [ 74.942768][ T6566] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 74.949990][ T6566] 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. [ 74.976941][ T6566] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 74.989627][ T6566] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 74.996773][ T6566] 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. [ 75.023887][ T6566] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 75.062686][ T6566] device hsr_slave_0 entered promiscuous mode [ 75.069890][ T6566] device hsr_slave_1 entered promiscuous mode [ 75.201546][ T6566] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 75.212387][ T6566] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 75.223458][ T6566] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 75.236563][ T6566] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 75.263375][ T6566] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.270713][ T6566] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.278654][ T6566] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.286230][ T6566] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.336419][ T6566] 8021q: adding VLAN 0 to HW filter on device bond0 [ 75.351558][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 75.364060][ T1264] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.374581][ T1264] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.383947][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 75.398918][ T6566] 8021q: adding VLAN 0 to HW filter on device team0 [ 75.412472][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 75.421464][ T1264] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.430320][ T1264] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.447888][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 75.456356][ T1264] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.464178][ T1264] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.487968][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 75.496805][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 75.506103][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 75.515904][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 75.526115][ T2221] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 75.540195][ T6566] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 75.559583][ T6898] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 75.567583][ T6898] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 75.583038][ T6566] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 75.602691][ T6898] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 75.625553][ T6898] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 75.634450][ T6898] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 75.643988][ T6898] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 75.656582][ T6566] device veth0_vlan entered promiscuous mode [ 75.670190][ T6566] device veth1_vlan entered promiscuous mode [ 75.696291][ T6566] device veth0_macvtap entered promiscuous mode [ 75.704678][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 75.714651][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 75.727555][ T6898] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 75.736228][ T6566] device veth1_macvtap entered promiscuous mode [ 75.753758][ T6566] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 75.762865][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 75.772424][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 75.781937][ T1264] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 75.796419][ T6566] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 75.805290][ T2976] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 75.814597][ T2976] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 75.829203][ T6566] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 75.838760][ T6566] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 75.848174][ T6566] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 75.857989][ T6566] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 75.950908][ T159] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 75.968155][ T159] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 75.998183][ T6898] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 76.020228][ T149] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 76.031080][ T149] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 76.041573][ T25] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/09/06 14:02:54 building call list... [ 78.139517][ T149] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 executing program [ 79.229865][ T6563] ================================================================== [ 79.238391][ T6563] BUG: KASAN: null-ptr-deref in fuse_conn_put+0x1d7/0x300 [ 79.245765][ T6563] Read of size 4 at addr 0000000000000000 by task syz-fuzzer/6563 [ 79.254202][ T6563] [ 79.256520][ T6563] CPU: 0 PID: 6563 Comm: syz-fuzzer Not tainted 5.14.0-next-20210906-syzkaller #0 [ 79.265907][ T6563] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.276271][ T6563] Call Trace: [ 79.279564][ T6563] dump_stack_lvl+0xcd/0x134 [ 79.284254][ T6563] kasan_report.cold+0x66/0xdf [ 79.289027][ T6563] ? fuse_conn_put+0x1d7/0x300 [ 79.294058][ T6563] kasan_check_range+0x13d/0x180 [ 79.298999][ T6563] fuse_conn_put+0x1d7/0x300 [ 79.303714][ T6563] fuse_dev_free+0x155/0x1f0 [ 79.308398][ T6563] fuse_dev_release+0x2a8/0x3f0 [ 79.313259][ T6563] ? fuse_abort_conn+0xc90/0xc90 [ 79.318205][ T6563] ? cuse_channel_release+0x237/0x300 [ 79.323690][ T6563] __fput+0x288/0x9f0 [ 79.327680][ T6563] ? cuse_class_waiting_show+0xa0/0xa0 [ 79.333149][ T6563] task_work_run+0xdd/0x1a0 [ 79.337668][ T6563] exit_to_user_mode_prepare+0x27e/0x290 [ 79.343307][ T6563] syscall_exit_to_user_mode+0x19/0x60 [ 79.349151][ T6563] do_syscall_64+0x42/0xb0 [ 79.353585][ T6563] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 79.359505][ T6563] RIP: 0033:0x4af19b [ 79.363408][ T6563] 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 [ 79.383734][ T6563] RSP: 002b:000000c00021d430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 79.392379][ T6563] RAX: 0000000000000000 RBX: 000000c00001c000 RCX: 00000000004af19b [ 79.400449][ T6563] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 79.408876][ T6563] RBP: 000000c00021d470 R08: 0000000000000001 R09: 0000000000000000 [ 79.416931][ T6563] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014b [ 79.425099][ T6563] R13: 000000000000014a R14: 0000000000000200 R15: 000000c000419180 [ 79.433217][ T6563] ================================================================== [ 79.441385][ T6563] Disabling lock debugging due to kernel taint [ 79.449612][ T6563] Kernel panic - not syncing: panic_on_warn set ... [ 79.456226][ T6563] CPU: 1 PID: 6563 Comm: syz-fuzzer Tainted: G B 5.14.0-next-20210906-syzkaller #0 [ 79.466932][ T6563] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.477114][ T6563] Call Trace: [ 79.480408][ T6563] dump_stack_lvl+0xcd/0x134 [ 79.485282][ T6563] panic+0x2b0/0x6dd [ 79.489267][ T6563] ? __warn_printk+0xf3/0xf3 [ 79.493876][ T6563] ? preempt_schedule_common+0x59/0xc0 [ 79.499436][ T6563] ? fuse_conn_put+0x1d7/0x300 [ 79.504377][ T6563] ? preempt_schedule_thunk+0x16/0x18 [ 79.510025][ T6563] ? trace_hardirqs_on+0x38/0x1c0 [ 79.515222][ T6563] ? trace_hardirqs_on+0x51/0x1c0 [ 79.520691][ T6563] ? fuse_conn_put+0x1d7/0x300 [ 79.525533][ T6563] ? fuse_conn_put+0x1d7/0x300 [ 79.530550][ T6563] end_report.cold+0x63/0x6f [ 79.535153][ T6563] kasan_report.cold+0x71/0xdf [ 79.539969][ T6563] ? fuse_conn_put+0x1d7/0x300 [ 79.545007][ T6563] kasan_check_range+0x13d/0x180 [ 79.550214][ T6563] fuse_conn_put+0x1d7/0x300 [ 79.555074][ T6563] fuse_dev_free+0x155/0x1f0 [ 79.559928][ T6563] fuse_dev_release+0x2a8/0x3f0 [ 79.564768][ T6563] ? fuse_abort_conn+0xc90/0xc90 [ 79.569692][ T6563] ? cuse_channel_release+0x237/0x300 [ 79.575454][ T6563] __fput+0x288/0x9f0 [ 79.579541][ T6563] ? cuse_class_waiting_show+0xa0/0xa0 [ 79.585388][ T6563] task_work_run+0xdd/0x1a0 [ 79.590017][ T6563] exit_to_user_mode_prepare+0x27e/0x290 [ 79.595653][ T6563] syscall_exit_to_user_mode+0x19/0x60 [ 79.601572][ T6563] do_syscall_64+0x42/0xb0 [ 79.605989][ T6563] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 79.611920][ T6563] RIP: 0033:0x4af19b [ 79.616161][ T6563] 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 [ 79.636364][ T6563] RSP: 002b:000000c00021d430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 79.644768][ T6563] RAX: 0000000000000000 RBX: 000000c00001c000 RCX: 00000000004af19b [ 79.653137][ T6563] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 79.661464][ T6563] RBP: 000000c00021d470 R08: 0000000000000001 R09: 0000000000000000 [ 79.669599][ T6563] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014b [ 79.677652][ T6563] R13: 000000000000014a R14: 0000000000000200 R15: 000000c000419180 [ 79.687656][ T6563] Kernel Offset: disabled [ 79.692061][ T6563] Rebooting in 86400 seconds..