[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ 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 Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.125' (ECDSA) to the list of known hosts. 2021/09/06 08:53:09 fuzzer started 2021/09/06 08:53:09 connecting to host at 10.128.0.169:45653 2021/09/06 08:53:09 checking machine... 2021/09/06 08:53:09 checking revisions... 2021/09/06 08:53:09 testing simple program... syzkaller login: [ 78.001070][ T6542] chnl_net:caif_netlink_parms(): no params data found [ 78.079820][ T6542] bridge0: port 1(bridge_slave_0) entered blocking state [ 78.088127][ T6542] bridge0: port 1(bridge_slave_0) entered disabled state [ 78.096137][ T6542] device bridge_slave_0 entered promiscuous mode [ 78.107655][ T6542] bridge0: port 2(bridge_slave_1) entered blocking state [ 78.114929][ T6542] bridge0: port 2(bridge_slave_1) entered disabled state [ 78.124329][ T6542] device bridge_slave_1 entered promiscuous mode [ 78.157762][ T6542] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 78.169556][ T6542] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 78.205287][ T6542] team0: Port device team_slave_0 added [ 78.213361][ T6542] team0: Port device team_slave_1 added [ 78.240246][ T6542] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 78.248046][ 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. [ 78.275871][ T6542] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 78.289340][ T6542] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 78.296406][ 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. [ 78.322659][ T6542] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 78.361084][ T6542] device hsr_slave_0 entered promiscuous mode [ 78.368339][ T6542] device hsr_slave_1 entered promiscuous mode [ 78.501349][ T6542] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 78.513061][ T6542] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 78.526784][ T6542] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 78.535824][ T6542] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 78.564498][ T6542] bridge0: port 2(bridge_slave_1) entered blocking state [ 78.571890][ T6542] bridge0: port 2(bridge_slave_1) entered forwarding state [ 78.579813][ T6542] bridge0: port 1(bridge_slave_0) entered blocking state [ 78.587082][ T6542] bridge0: port 1(bridge_slave_0) entered forwarding state [ 78.639456][ T6542] 8021q: adding VLAN 0 to HW filter on device bond0 [ 78.653314][ T1287] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 78.664808][ T1287] bridge0: port 1(bridge_slave_0) entered disabled state [ 78.675004][ T1287] bridge0: port 2(bridge_slave_1) entered disabled state [ 78.684575][ T1287] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 78.698704][ T6542] 8021q: adding VLAN 0 to HW filter on device team0 [ 78.711281][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 78.721116][ T2026] bridge0: port 1(bridge_slave_0) entered blocking state [ 78.728284][ T2026] bridge0: port 1(bridge_slave_0) entered forwarding state [ 78.748936][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 78.757565][ T2026] bridge0: port 2(bridge_slave_1) entered blocking state [ 78.764691][ T2026] bridge0: port 2(bridge_slave_1) entered forwarding state [ 78.779070][ T1287] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 78.788310][ T1287] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 78.808837][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 78.817355][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 78.825970][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 78.840343][ T6542] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 78.861194][ T6876] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 78.869032][ T6876] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 78.883103][ T6542] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 78.904633][ T6876] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 78.926558][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 78.934996][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 78.943781][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 78.956222][ T6542] device veth0_vlan entered promiscuous mode [ 78.970401][ T6542] device veth1_vlan entered promiscuous mode [ 78.987512][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 78.995775][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 79.013880][ T6542] device veth0_macvtap entered promiscuous mode [ 79.022786][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 79.032597][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 79.042074][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 79.054972][ T6542] device veth1_macvtap entered promiscuous mode [ 79.072965][ T6542] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 79.080743][ T6876] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 79.092469][ T6876] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 79.101808][ T6876] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 79.116964][ T6542] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 79.124510][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 79.135092][ T1052] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 79.148858][ T6542] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 79.158161][ T6542] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 79.167578][ T6542] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 79.178489][ T6542] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 79.271832][ T1206] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 79.285011][ T1206] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 79.311224][ T1287] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 79.342375][ T149] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 79.350942][ T149] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 79.361886][ T2026] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/09/06 08:53:13 building call list... [ 81.757910][ T159] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 executing program [ 82.624390][ T6539] ================================================================== [ 82.632833][ T6539] BUG: KASAN: null-ptr-deref in fuse_conn_put+0x1d7/0x300 [ 82.640058][ T6539] Read of size 4 at addr 0000000000000000 by task syz-fuzzer/6539 [ 82.648066][ T6539] [ 82.650462][ T6539] CPU: 0 PID: 6539 Comm: syz-fuzzer Not tainted 5.14.0-next-20210906-syzkaller #0 [ 82.659643][ T6539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.669792][ T6539] Call Trace: [ 82.673060][ T6539] dump_stack_lvl+0xcd/0x134 [ 82.677733][ T6539] kasan_report.cold+0x66/0xdf [ 82.683125][ T6539] ? fuse_conn_put+0x1d7/0x300 [ 82.687896][ T6539] kasan_check_range+0x13d/0x180 [ 82.692956][ T6539] fuse_conn_put+0x1d7/0x300 [ 82.697639][ T6539] fuse_dev_free+0x155/0x1f0 [ 82.702324][ T6539] fuse_dev_release+0x2a8/0x3f0 [ 82.707303][ T6539] ? fuse_abort_conn+0xc90/0xc90 [ 82.712341][ T6539] ? cuse_channel_release+0x237/0x300 [ 82.717719][ T6539] __fput+0x288/0x9f0 [ 82.721705][ T6539] ? cuse_class_waiting_show+0xa0/0xa0 [ 82.727197][ T6539] task_work_run+0xdd/0x1a0 [ 82.731721][ T6539] exit_to_user_mode_prepare+0x27e/0x290 [ 82.737379][ T6539] syscall_exit_to_user_mode+0x19/0x60 [ 82.742849][ T6539] do_syscall_64+0x42/0xb0 [ 82.747267][ T6539] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 82.753166][ T6539] RIP: 0033:0x4af19b [ 82.757060][ T6539] 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 [ 82.776754][ T6539] RSP: 002b:000000c0002d5430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 82.785397][ T6539] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 82.793542][ T6539] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 82.801858][ T6539] RBP: 000000c0002d5470 R08: 0000000000000001 R09: 0000000000000000 [ 82.810175][ T6539] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014e [ 82.818417][ T6539] R13: 000000000000014d R14: 0000000000000200 R15: 000000c0002fc000 [ 82.826511][ T6539] ================================================================== [ 82.834730][ T6539] Disabling lock debugging due to kernel taint [ 82.842844][ T6539] Kernel panic - not syncing: panic_on_warn set ... [ 82.849620][ T6539] CPU: 1 PID: 6539 Comm: syz-fuzzer Tainted: G B 5.14.0-next-20210906-syzkaller #0 [ 82.860574][ T6539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.871070][ T6539] Call Trace: [ 82.874341][ T6539] dump_stack_lvl+0xcd/0x134 [ 82.878938][ T6539] panic+0x2b0/0x6dd [ 82.882841][ T6539] ? __warn_printk+0xf3/0xf3 [ 82.887434][ T6539] ? preempt_schedule_common+0x59/0xc0 [ 82.892980][ T6539] ? fuse_conn_put+0x1d7/0x300 [ 82.897741][ T6539] ? preempt_schedule_thunk+0x16/0x18 [ 82.903202][ T6539] ? trace_hardirqs_on+0x38/0x1c0 [ 82.908235][ T6539] ? trace_hardirqs_on+0x51/0x1c0 [ 82.913263][ T6539] ? fuse_conn_put+0x1d7/0x300 [ 82.918021][ T6539] ? fuse_conn_put+0x1d7/0x300 [ 82.922965][ T6539] end_report.cold+0x63/0x6f [ 82.927772][ T6539] kasan_report.cold+0x71/0xdf [ 82.932637][ T6539] ? fuse_conn_put+0x1d7/0x300 [ 82.937399][ T6539] kasan_check_range+0x13d/0x180 [ 82.942425][ T6539] fuse_conn_put+0x1d7/0x300 [ 82.947131][ T6539] fuse_dev_free+0x155/0x1f0 [ 82.951893][ T6539] fuse_dev_release+0x2a8/0x3f0 [ 82.956764][ T6539] ? fuse_abort_conn+0xc90/0xc90 [ 82.961699][ T6539] ? cuse_channel_release+0x237/0x300 [ 82.967074][ T6539] __fput+0x288/0x9f0 [ 82.971073][ T6539] ? cuse_class_waiting_show+0xa0/0xa0 [ 82.976637][ T6539] task_work_run+0xdd/0x1a0 [ 82.981162][ T6539] exit_to_user_mode_prepare+0x27e/0x290 [ 82.986881][ T6539] syscall_exit_to_user_mode+0x19/0x60 [ 82.992340][ T6539] do_syscall_64+0x42/0xb0 [ 82.996756][ T6539] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 83.002665][ T6539] RIP: 0033:0x4af19b [ 83.006555][ T6539] 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 [ 83.026244][ T6539] RSP: 002b:000000c0002d5430 EFLAGS: 00000206 ORIG_RAX: 0000000000000003 [ 83.034740][ T6539] RAX: 0000000000000000 RBX: 000000c00001e800 RCX: 00000000004af19b [ 83.042795][ T6539] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 [ 83.050845][ T6539] RBP: 000000c0002d5470 R08: 0000000000000001 R09: 0000000000000000 [ 83.058900][ T6539] R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000014e [ 83.066873][ T6539] R13: 000000000000014d R14: 0000000000000200 R15: 000000c0002fc000 [ 83.074903][ T6539] Kernel Offset: disabled [ 83.079325][ T6539] Rebooting in 86400 seconds..