[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.226' (ECDSA) to the list of known hosts. 2021/09/03 09:16:47 fuzzer started 2021/09/03 09:16:48 connecting to host at 10.128.0.169:32907 2021/09/03 09:16:48 checking machine... 2021/09/03 09:16:48 checking revisions... 2021/09/03 09:16:48 testing simple program... syzkaller login: [ 73.715985][ T6589] chnl_net:caif_netlink_parms(): no params data found [ 73.851861][ T6589] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.859753][ T6589] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.869444][ T6589] device bridge_slave_0 entered promiscuous mode [ 73.881658][ T6589] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.888820][ T6589] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.897526][ T6589] device bridge_slave_1 entered promiscuous mode [ 73.926260][ T6589] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 73.937316][ T6589] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 73.970318][ T6589] team0: Port device team_slave_0 added [ 73.977658][ T6589] team0: Port device team_slave_1 added [ 74.007139][ T6589] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 74.014274][ T6589] 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. [ 74.040381][ T6589] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 74.053048][ T6589] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 74.059996][ T6589] 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. [ 74.090790][ T6589] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 74.127167][ T6589] device hsr_slave_0 entered promiscuous mode [ 74.135153][ T6589] device hsr_slave_1 entered promiscuous mode [ 74.260051][ T6589] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 74.273488][ T6589] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 74.284017][ T6589] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 74.296835][ T6589] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 74.323917][ T6589] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.331400][ T6589] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.339453][ T6589] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.346717][ T6589] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.389241][ T6589] 8021q: adding VLAN 0 to HW filter on device bond0 [ 74.403901][ T1053] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 74.416722][ T1053] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.426657][ T1053] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.436672][ T1053] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 74.452940][ T6589] 8021q: adding VLAN 0 to HW filter on device team0 [ 74.464219][ T1053] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 74.473650][ T1053] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.481162][ T1053] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.493675][ T1276] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 74.502828][ T1276] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.509872][ T1276] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.530099][ T1051] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 74.539042][ T1051] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 74.553852][ T1276] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 74.567172][ T1053] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 74.579238][ T1051] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 74.591565][ T6589] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 74.612525][ T1276] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 74.620128][ T1276] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 74.633698][ T6589] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 74.653941][ T1053] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 74.675300][ T6924] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 74.683793][ T6924] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 74.692896][ T6924] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 74.705343][ T6589] device veth0_vlan entered promiscuous mode [ 74.718061][ T6589] device veth1_vlan entered promiscuous mode [ 74.741765][ T2956] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 74.751960][ T2956] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 74.765409][ T6589] device veth0_macvtap entered promiscuous mode [ 74.775993][ T6589] device veth1_macvtap entered promiscuous mode [ 74.802000][ T6589] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 74.809460][ T6924] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 74.818799][ T6924] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 74.827794][ T6924] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 74.837213][ T6924] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 74.850035][ T6589] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 74.858504][ T1276] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 74.867325][ T1276] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 74.879511][ T6589] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.888818][ T6589] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 74.899547][ T6589] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 74.909008][ T6589] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 75.010043][ T159] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 75.023922][ T159] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 75.046856][ T2956] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 75.066923][ T149] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 75.075911][ T149] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 75.087278][ T1276] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/09/03 09:16:51 building call list... [ 77.508610][ T8] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 executing program [ 78.096443][ T6589] syz-executor.0 (6589) used greatest stack depth: 22360 bytes left [ 78.285322][ T6955] ================================================================== [ 78.293527][ T6955] BUG: KASAN: null-ptr-deref in fuse_conn_put+0x1d7/0x300 [ 78.300798][ T6955] Read of size 4 at addr 0000000000000000 by task syz-fuzzer/6955 [ 78.308608][ T6955] [ 78.310923][ T6955] CPU: 0 PID: 6955 Comm: syz-fuzzer Not tainted 5.14.0-next-20210903-syzkaller #0 [ 78.320232][ T6955] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.330281][ T6955] Call Trace: [ 78.333556][ T6955] dump_stack_lvl+0xcd/0x134 [ 78.338160][ T6955] kasan_report.cold+0x66/0xdf [ 78.343020][ T6955] ? fuse_conn_put+0x1d7/0x300 [ 78.347801][ T6955] kasan_check_range+0x13d/0x180 [ 78.352917][ T6955] fuse_conn_put+0x1d7/0x300 [ 78.357515][ T6955] fuse_dev_free+0x155/0x1f0 [ 78.362123][ T6955] fuse_dev_release+0x2a8/0x3f0 [ 78.366986][ T6955] ? fuse_abort_conn+0xc90/0xc90 [ 78.371929][ T6955] ? cuse_channel_release+0x237/0x300 [ 78.377510][ T6955] __fput+0x288/0x9f0 [ 78.381584][ T6955] ? cuse_class_waiting_show+0xa0/0xa0 [ 78.387056][ T6955] task_work_run+0xdd/0x1a0 [ 78.391842][ T6955] exit_to_user_mode_prepare+0x27e/0x290 [ 78.397479][ T6955] syscall_exit_to_user_mode+0x19/0x60 [ 78.402949][ T6955] do_syscall_64+0x42/0xb0 [ 78.407365][ T6955] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 78.413264][ T6955] RIP: 0033:0x4af19b [ 78.417159][ T6955] 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 [ 78.437039][ T6955] RSP: 002b:000000c000355430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 78.445820][ T6955] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 78.453790][ T6955] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 78.461842][ T6955] RBP: 000000c000355470 R08: 0000000000000001 R09: 0000000000000000 [ 78.469839][ T6955] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000043 [ 78.477834][ T6955] R13: 0000000000000042 R14: 0000000000000200 R15: 000000c000442000 [ 78.485851][ T6955] ================================================================== [ 78.493988][ T6955] Disabling lock debugging due to kernel taint [ 78.501359][ T6955] Kernel panic - not syncing: panic_on_warn set ... [ 78.508239][ T6955] CPU: 1 PID: 6955 Comm: syz-fuzzer Tainted: G B 5.14.0-next-20210903-syzkaller #0 [ 78.519042][ T6955] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.529180][ T6955] Call Trace: [ 78.532538][ T6955] dump_stack_lvl+0xcd/0x134 [ 78.537137][ T6955] panic+0x2b0/0x6dd [ 78.541296][ T6955] ? __warn_printk+0xf3/0xf3 [ 78.545897][ T6955] ? preempt_schedule_common+0x59/0xc0 [ 78.551377][ T6955] ? fuse_conn_put+0x1d7/0x300 [ 78.556138][ T6955] ? preempt_schedule_thunk+0x16/0x18 [ 78.561596][ T6955] ? trace_hardirqs_on+0x38/0x1c0 [ 78.566659][ T6955] ? trace_hardirqs_on+0x51/0x1c0 [ 78.571693][ T6955] ? fuse_conn_put+0x1d7/0x300 [ 78.576455][ T6955] ? fuse_conn_put+0x1d7/0x300 [ 78.581214][ T6955] end_report.cold+0x63/0x6f [ 78.585822][ T6955] kasan_report.cold+0x71/0xdf [ 78.590588][ T6955] ? fuse_conn_put+0x1d7/0x300 [ 78.595349][ T6955] kasan_check_range+0x13d/0x180 [ 78.600539][ T6955] fuse_conn_put+0x1d7/0x300 [ 78.605136][ T6955] fuse_dev_free+0x155/0x1f0 [ 78.609722][ T6955] fuse_dev_release+0x2a8/0x3f0 [ 78.614574][ T6955] ? fuse_abort_conn+0xc90/0xc90 [ 78.619510][ T6955] ? cuse_channel_release+0x237/0x300 [ 78.624977][ T6955] __fput+0x288/0x9f0 [ 78.628961][ T6955] ? cuse_class_waiting_show+0xa0/0xa0 [ 78.634425][ T6955] task_work_run+0xdd/0x1a0 [ 78.638925][ T6955] exit_to_user_mode_prepare+0x27e/0x290 [ 78.644644][ T6955] syscall_exit_to_user_mode+0x19/0x60 [ 78.650120][ T6955] do_syscall_64+0x42/0xb0 [ 78.654529][ T6955] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 78.660422][ T6955] RIP: 0033:0x4af19b [ 78.664309][ T6955] 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 [ 78.683922][ T6955] RSP: 002b:000000c000355430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 78.692333][ T6955] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 78.700384][ T6955] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 78.708382][ T6955] RBP: 000000c000355470 R08: 0000000000000001 R09: 0000000000000000 [ 78.716437][ T6955] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000043 [ 78.724409][ T6955] R13: 0000000000000042 R14: 0000000000000200 R15: 000000c000442000 [ 78.733835][ T6955] Kernel Offset: disabled [ 78.738153][ T6955] Rebooting in 86400 seconds..