[ OK ] Started OpenBSD Secure Shell server. [ 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 '10.128.0.17' (ECDSA) to the list of known hosts. syzkaller login: [ 42.201800][ T7047] IPVS: ftp: loaded support on port[0] = 21 [ 42.279740][ T7047] chnl_net:caif_netlink_parms(): no params data found [ 42.325762][ T7047] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.334421][ T7047] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.343647][ T7047] device bridge_slave_0 entered promiscuous mode [ 42.352710][ T7047] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.359804][ T7047] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.368488][ T7047] device bridge_slave_1 entered promiscuous mode [ 42.386425][ T7047] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 42.397054][ T7047] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 42.417964][ T7047] team0: Port device team_slave_0 added [ 42.425353][ T7047] team0: Port device team_slave_1 added [ 42.441059][ T7047] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 42.448022][ T7047] 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. [ 42.474237][ T7047] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 42.486528][ T7047] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 42.493852][ T7047] 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. [ 42.519964][ T7047] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 42.593083][ T7047] device hsr_slave_0 entered promiscuous mode [ 42.630530][ T7047] device hsr_slave_1 entered promiscuous mode [ 42.742548][ T7047] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 42.783146][ T7047] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 42.852761][ T7047] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 42.892130][ T7047] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 42.954405][ T7047] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.961591][ T7047] bridge0: port 2(bridge_slave_1) entered forwarding state [ 42.969238][ T7047] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.976386][ T7047] bridge0: port 1(bridge_slave_0) entered forwarding state [ 43.013966][ T7047] 8021q: adding VLAN 0 to HW filter on device bond0 [ 43.026733][ T2753] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 43.037243][ T2753] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.045394][ T2753] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.053896][ T2753] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 43.067313][ T7047] 8021q: adding VLAN 0 to HW filter on device team0 [ 43.078025][ T2723] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 43.086942][ T2723] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.094087][ T2723] bridge0: port 1(bridge_slave_0) entered forwarding state [ 43.111479][ T2739] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 43.119787][ T2739] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.126909][ T2739] bridge0: port 2(bridge_slave_1) entered forwarding state [ 43.145427][ T7047] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 43.156277][ T7047] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 43.170916][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 43.179328][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 43.188667][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 43.198329][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 43.207591][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 43.215421][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 43.232728][ T2723] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 43.241050][ T2723] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 43.253640][ T7047] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 43.271577][ T2723] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 43.291126][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 43.299510][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 43.309506][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 43.318596][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 43.327646][ T7047] device veth0_vlan entered promiscuous mode [ 43.338580][ T7047] device veth1_vlan entered promiscuous mode [ 43.361168][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 43.369220][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 43.377820][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 43.386451][ T2696] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 43.398090][ T7047] device veth0_macvtap entered promiscuous mode [ 43.407940][ T7047] device veth1_macvtap entered promiscuous mode [ 43.424393][ T7047] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 43.432140][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 43.442155][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 43.450590][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 43.459609][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 43.472283][ T7047] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 43.481130][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 43.489703][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 43.677239][ T27] audit: type=1800 audit(1589504956.426:2): pid=7255 uid=0 auid=0 ses=5 subj=_ op=collect_data cause=failed(directio) comm="syz-executor676" name="file0" dev="sda1" ino=15705 res=0 [ 43.701273][ T7255] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 43.735671][ T7255] Process accounting resumed [ 43.752558][ T7047] syz-executor676 (7047) used greatest stack depth: 24056 bytes left [ 43.764140][ T7255] Process accounting resumed [ 43.811622][ T7255] ================================================================== [ 43.819898][ T7255] BUG: KASAN: use-after-free in get_block+0xbaa/0x1600 [ 43.826719][ T7255] Write of size 2 at addr ffff8880891f9ba4 by task syz-executor676/7255 [ 43.835010][ T7255] [ 43.837315][ T7255] CPU: 1 PID: 7255 Comm: syz-executor676 Not tainted 5.7.0-rc5-syzkaller #0 [ 43.845971][ T7255] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.856025][ T7255] Call Trace: [ 43.859313][ T7255] dump_stack+0x1e9/0x30e [ 43.863621][ T7255] print_address_description+0x74/0x5c0 [ 43.869141][ T7255] ? printk+0x62/0x83 [ 43.873190][ T7255] ? vprintk_emit+0x339/0x3c0 [ 43.877840][ T7255] __kasan_report+0x103/0x1a0 [ 43.882492][ T7255] ? get_block+0xbaa/0x1600 [ 43.886969][ T7255] ? get_block+0xbaa/0x1600 [ 43.891445][ T7255] kasan_report+0x4d/0x80 [ 43.895747][ T7255] ? get_block+0xbaa/0x1600 [ 43.900237][ T7255] ? minix_get_block+0x90/0xf0 [ 43.904989][ T7255] ? __block_write_begin_int+0x708/0x1a00 [ 43.910689][ T7255] ? minix_prepare_chunk+0x30/0x30 [ 43.915772][ T7255] ? wait_for_stable_page+0x10f/0x150 [ 43.921198][ T7255] ? minix_prepare_chunk+0x30/0x30 [ 43.926315][ T7255] ? block_write_begin+0x59/0x280 [ 43.931318][ T7255] ? minix_write_begin+0x38/0x1f0 [ 43.936335][ T7255] ? generic_perform_write+0x23b/0x4e0 [ 43.941786][ T7255] ? __generic_file_write_iter+0x22b/0x4e0 [ 43.947566][ T7255] ? down_write+0xcd/0x130 [ 43.951970][ T7255] ? generic_file_write_iter+0x4a6/0x650 [ 43.957579][ T7255] ? __vfs_write+0x54c/0x710 [ 43.962166][ T7255] ? __kernel_write+0x120/0x350 [ 43.967135][ T7255] ? do_acct_process+0xec6/0x12b0 [ 43.972148][ T7255] ? acct_pin_kill+0x27/0x130 [ 43.976804][ T7255] ? pin_kill+0x218/0x6a0 [ 43.981112][ T7255] ? init_wait_entry+0xd0/0xd0 [ 43.985890][ T7255] ? mnt_pin_kill+0x9d/0x160 [ 43.990471][ T7255] ? cleanup_mnt+0x48c/0x4e0 [ 43.995071][ T7255] ? task_work_run+0x147/0x1d0 [ 43.999810][ T7255] ? do_exit+0x5ef/0x1f80 [ 44.004142][ T7255] ? do_group_exit+0x15e/0x2c0 [ 44.008879][ T7255] ? get_signal+0x13cf/0x1d60 [ 44.013557][ T7255] ? _raw_spin_unlock_irqrestore+0xb4/0xd0 [ 44.019349][ T7255] ? check_preemption_disabled+0x40/0x240 [ 44.025042][ T7255] ? do_signal+0x33/0x610 [ 44.029343][ T7255] ? __se_sys_futex+0x2a7/0x390 [ 44.034165][ T7255] ? prepare_exit_to_usermode+0x280/0x600 [ 44.039857][ T7255] ? prepare_exit_to_usermode+0x32a/0x600 [ 44.045560][ T7255] ? syscall_return_slowpath+0xf9/0x420 [ 44.051084][ T7255] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 44.057124][ T7255] [ 44.059424][ T7255] The buggy address belongs to the page: [ 44.065037][ T7255] page:ffffea0002247e40 refcount:0 mapcount:0 mapping:000000002236d919 index:0x1 [ 44.074126][ T7255] flags: 0xfffe0000000000() [ 44.078616][ T7255] raw: 00fffe0000000000 ffffea000224f648 ffffea0002212908 0000000000000000 [ 44.087168][ T7255] raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 [ 44.095729][ T7255] page dumped because: kasan: bad access detected [ 44.102124][ T7255] [ 44.104539][ T7255] Memory state around the buggy address: [ 44.110146][ T7255] ffff8880891f9a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 44.118215][ T7255] ffff8880891f9b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 44.126272][ T7255] >ffff8880891f9b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 44.134344][ T7255] ^ [ 44.139441][ T7255] ffff8880891f9c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 44.147477][ T7255] ffff8880891f9c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 44.155507][ T7255] ================================================================== [ 44.163535][ T7255] Disabling lock debugging due to kernel taint [ 44.173524][ T7255] Kernel panic - not syncing: panic_on_warn set ... [ 44.180167][ T7255] CPU: 1 PID: 7255 Comm: syz-executor676 Tainted: G B 5.7.0-rc5-syzkaller #0 [ 44.190216][ T7255] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.200265][ T7255] Call Trace: [ 44.203575][ T7255] dump_stack+0x1e9/0x30e [ 44.207878][ T7255] panic+0x264/0x7a0 [ 44.211746][ T7255] ? trace_hardirqs_on+0x30/0x70 [ 44.216651][ T7255] __kasan_report+0x191/0x1a0 [ 44.221311][ T7255] ? get_block+0xbaa/0x1600 [ 44.225783][ T7255] ? get_block+0xbaa/0x1600 [ 44.230252][ T7255] kasan_report+0x4d/0x80 [ 44.234550][ T7255] ? get_block+0xbaa/0x1600 [ 44.239048][ T7255] ? minix_get_block+0x90/0xf0 [ 44.243779][ T7255] ? __block_write_begin_int+0x708/0x1a00 [ 44.249497][ T7255] ? minix_prepare_chunk+0x30/0x30 [ 44.254595][ T7255] ? wait_for_stable_page+0x10f/0x150 [ 44.259959][ T7255] ? minix_prepare_chunk+0x30/0x30 [ 44.265050][ T7255] ? block_write_begin+0x59/0x280 [ 44.270061][ T7255] ? minix_write_begin+0x38/0x1f0 [ 44.275054][ T7255] ? generic_perform_write+0x23b/0x4e0 [ 44.280498][ T7255] ? __generic_file_write_iter+0x22b/0x4e0 [ 44.286274][ T7255] ? down_write+0xcd/0x130 [ 44.290746][ T7255] ? generic_file_write_iter+0x4a6/0x650 [ 44.296362][ T7255] ? __vfs_write+0x54c/0x710 [ 44.300924][ T7255] ? __kernel_write+0x120/0x350 [ 44.305742][ T7255] ? do_acct_process+0xec6/0x12b0 [ 44.310738][ T7255] ? acct_pin_kill+0x27/0x130 [ 44.315380][ T7255] ? pin_kill+0x218/0x6a0 [ 44.319680][ T7255] ? init_wait_entry+0xd0/0xd0 [ 44.324420][ T7255] ? mnt_pin_kill+0x9d/0x160 [ 44.328977][ T7255] ? cleanup_mnt+0x48c/0x4e0 [ 44.333536][ T7255] ? task_work_run+0x147/0x1d0 [ 44.338268][ T7255] ? do_exit+0x5ef/0x1f80 [ 44.342582][ T7255] ? do_group_exit+0x15e/0x2c0 [ 44.347313][ T7255] ? get_signal+0x13cf/0x1d60 [ 44.351963][ T7255] ? _raw_spin_unlock_irqrestore+0xb4/0xd0 [ 44.357736][ T7255] ? check_preemption_disabled+0x40/0x240 [ 44.363428][ T7255] ? do_signal+0x33/0x610 [ 44.367727][ T7255] ? __se_sys_futex+0x2a7/0x390 [ 44.372558][ T7255] ? prepare_exit_to_usermode+0x280/0x600 [ 44.378272][ T7255] ? prepare_exit_to_usermode+0x32a/0x600 [ 44.383974][ T7255] ? syscall_return_slowpath+0xf9/0x420 [ 44.389524][ T7255] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 44.397062][ T7255] Kernel Offset: disabled [ 44.401397][ T7255] Rebooting in 86400 seconds..