[ 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 '10.128.1.33' (ECDSA) to the list of known hosts. syzkaller login: [ 41.834805][ T6776] IPVS: ftp: loaded support on port[0] = 21 [ 41.912800][ T6776] chnl_net:caif_netlink_parms(): no params data found [ 41.954543][ T6776] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.962933][ T6776] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.970575][ T6776] device bridge_slave_0 entered promiscuous mode [ 41.979838][ T6776] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.987187][ T6776] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.994999][ T6776] device bridge_slave_1 entered promiscuous mode [ 42.013057][ T6776] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 42.024056][ T6776] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 42.043936][ T6776] team0: Port device team_slave_0 added [ 42.050882][ T6776] team0: Port device team_slave_1 added [ 42.066677][ T6776] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 42.073872][ T6776] 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. [ 42.106916][ T6776] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 42.118983][ T6776] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 42.126017][ T6776] 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. [ 42.152910][ T6776] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 42.243432][ T6776] device hsr_slave_0 entered promiscuous mode [ 42.281431][ T6776] device hsr_slave_1 entered promiscuous mode [ 42.410392][ T6776] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 42.453711][ T6776] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 42.503825][ T6776] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 42.573574][ T6776] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 42.644762][ T6776] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.652048][ T6776] bridge0: port 2(bridge_slave_1) entered forwarding state [ 42.659713][ T6776] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.666886][ T6776] bridge0: port 1(bridge_slave_0) entered forwarding state [ 42.704724][ T6776] 8021q: adding VLAN 0 to HW filter on device bond0 [ 42.717451][ T2566] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 42.727429][ T2566] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.735462][ T2566] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.743512][ T2566] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 42.756283][ T6776] 8021q: adding VLAN 0 to HW filter on device team0 [ 42.766046][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 42.776328][ T23] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.783554][ T23] bridge0: port 1(bridge_slave_0) entered forwarding state [ 42.795504][ T2566] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 42.804324][ T2566] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.811421][ T2566] bridge0: port 2(bridge_slave_1) entered forwarding state [ 42.833445][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 42.843005][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 42.852307][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 42.863778][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 42.874917][ T2566] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 42.885258][ T6776] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 42.902516][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 42.909921][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 42.923449][ T6776] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 42.939925][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 42.950554][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 42.969895][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 42.979215][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 42.989624][ T6776] device veth0_vlan entered promiscuous mode [ 42.996668][ T2472] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 43.006241][ T2472] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 43.023208][ T6776] device veth1_vlan entered promiscuous mode [ 43.040479][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 43.048769][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 43.057401][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 43.066835][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 43.077451][ T6776] device veth0_macvtap entered promiscuous mode [ 43.087677][ T6776] device veth1_macvtap entered promiscuous mode [ 43.102917][ T6776] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 43.110507][ T2472] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 43.111393][ T2472] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 43.126462][ T2472] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 43.135571][ T2472] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 43.147035][ T6776] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 43.155398][ T2472] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 43.165354][ T2472] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 43.339589][ T29] audit: type=1800 audit(1594576479.797:2): pid=6776 uid=0 auid=0 ses=5 subj=_ op=collect_data cause=failed(directio) comm="syz-executor273" name="file0" dev="sda1" ino=15707 res=0 [ 43.355366][ T6776] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 43.382605][ T6776] Process accounting resumed [ 43.401656][ T6776] ================================================================== [ 43.409850][ T6776] BUG: KASAN: use-after-free in get_block+0x69a/0x1600 [ 43.416769][ T6776] Read of size 2 at addr ffff88808c5c118a by task syz-executor273/6776 [ 43.424996][ T6776] [ 43.427329][ T6776] CPU: 0 PID: 6776 Comm: syz-executor273 Not tainted 5.8.0-rc4-syzkaller #0 [ 43.437308][ T6776] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.447367][ T6776] Call Trace: [ 43.450665][ T6776] dump_stack+0x1f0/0x31e [ 43.455947][ T6776] print_address_description+0x66/0x5a0 [ 43.461471][ T6776] ? vprintk_emit+0x342/0x3c0 [ 43.466122][ T6776] ? printk+0x62/0x83 [ 43.470112][ T6776] ? vprintk_emit+0x339/0x3c0 [ 43.474765][ T6776] kasan_report+0x132/0x1d0 [ 43.479259][ T6776] ? get_block+0x69a/0x1600 [ 43.483766][ T6776] get_block+0x69a/0x1600 [ 43.488089][ T6776] ? minix_get_block+0x90/0xf0 [ 43.492876][ T6776] __block_write_begin_int+0x708/0x1a00 [ 43.498425][ T6776] ? minix_prepare_chunk+0x30/0x30 [ 43.503521][ T6776] ? wait_for_stable_page+0x10f/0x150 [ 43.508912][ T6776] ? minix_prepare_chunk+0x30/0x30 [ 43.513997][ T6776] block_write_begin+0x59/0x280 [ 43.518826][ T6776] minix_write_begin+0x38/0x1f0 [ 43.523657][ T6776] generic_perform_write+0x23b/0x4e0 [ 43.528920][ T6776] __generic_file_write_iter+0x22b/0x4e0 [ 43.534527][ T6776] ? down_write+0xcd/0x130 [ 43.538916][ T6776] generic_file_write_iter+0x4a6/0x650 [ 43.544358][ T6776] __kernel_write+0x85b/0xa60 [ 43.549033][ T6776] do_acct_process+0xec6/0x12b0 [ 43.553865][ T6776] acct_process+0x398/0x4a0 [ 43.558340][ T6776] do_exit+0x593/0x1f80 [ 43.562511][ T6776] ? do_raw_spin_unlock+0x134/0x8d0 [ 43.567681][ T6776] do_group_exit+0x161/0x2d0 [ 43.572245][ T6776] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 43.578281][ T6776] __do_sys_exit_group+0x13/0x20 [ 43.583207][ T6776] __se_sys_exit_group+0x10/0x10 [ 43.588114][ T6776] __x64_sys_exit_group+0x37/0x40 [ 43.593110][ T6776] do_syscall_64+0x73/0xe0 [ 43.597502][ T6776] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 43.603368][ T6776] RIP: 0033:0x446c88 [ 43.607228][ T6776] Code: Bad RIP value. [ 43.611280][ T6776] RSP: 002b:00007fff791accb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 43.619670][ T6776] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000446c88 [ 43.627627][ T6776] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 43.635582][ T6776] RBP: 00000000004ca370 R08: 00000000000000e7 R09: ffffffffffffffd4 [ 43.643535][ T6776] R10: 00007fff791acbd0 R11: 0000000000000246 R12: 0000000000000001 [ 43.651479][ T6776] R13: 00000000006dda40 R14: 0000000000000000 R15: 0000000000000000 [ 43.659452][ T6776] [ 43.661752][ T6776] The buggy address belongs to the page: [ 43.667356][ T6776] page:ffffea0002317040 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 [ 43.676481][ T6776] flags: 0xfffe0000000000() [ 43.680963][ T6776] raw: 00fffe0000000000 ffffea00022fe388 ffffea0002315e88 0000000000000000 [ 43.689534][ T6776] raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 [ 43.698090][ T6776] page dumped because: kasan: bad access detected [ 43.704472][ T6776] [ 43.706771][ T6776] Memory state around the buggy address: [ 43.712374][ T6776] ffff88808c5c1080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 43.720445][ T6776] ffff88808c5c1100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 43.728477][ T6776] >ffff88808c5c1180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 43.736507][ T6776] ^ [ 43.740856][ T6776] ffff88808c5c1200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 43.748887][ T6776] ffff88808c5c1280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 43.756921][ T6776] ================================================================== [ 43.769302][ T6776] Disabling lock debugging due to kernel taint [ 43.776972][ T6776] Kernel panic - not syncing: panic_on_warn set ... [ 43.783563][ T6776] CPU: 0 PID: 6776 Comm: syz-executor273 Tainted: G B 5.8.0-rc4-syzkaller #0 [ 43.793612][ T6776] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.803656][ T6776] Call Trace: [ 43.806922][ T6776] dump_stack+0x1f0/0x31e [ 43.811226][ T6776] panic+0x264/0x7a0 [ 43.815098][ T6776] ? trace_hardirqs_on+0x30/0x80 [ 43.820003][ T6776] ? _raw_spin_unlock_irqrestore+0xa5/0xd0 [ 43.825775][ T6776] kasan_report+0x1c9/0x1d0 [ 43.830259][ T6776] ? get_block+0x69a/0x1600 [ 43.834739][ T6776] get_block+0x69a/0x1600 [ 43.839040][ T6776] ? minix_get_block+0x90/0xf0 [ 43.843771][ T6776] __block_write_begin_int+0x708/0x1a00 [ 43.849285][ T6776] ? minix_prepare_chunk+0x30/0x30 [ 43.854380][ T6776] ? wait_for_stable_page+0x10f/0x150 [ 43.859721][ T6776] ? minix_prepare_chunk+0x30/0x30 [ 43.864813][ T6776] block_write_begin+0x59/0x280 [ 43.869632][ T6776] minix_write_begin+0x38/0x1f0 [ 43.874451][ T6776] generic_perform_write+0x23b/0x4e0 [ 43.879705][ T6776] __generic_file_write_iter+0x22b/0x4e0 [ 43.885313][ T6776] ? down_write+0xcd/0x130 [ 43.889696][ T6776] generic_file_write_iter+0x4a6/0x650 [ 43.895125][ T6776] __kernel_write+0x85b/0xa60 [ 43.899776][ T6776] do_acct_process+0xec6/0x12b0 [ 43.904611][ T6776] acct_process+0x398/0x4a0 [ 43.909083][ T6776] do_exit+0x593/0x1f80 [ 43.913213][ T6776] ? do_raw_spin_unlock+0x134/0x8d0 [ 43.918376][ T6776] do_group_exit+0x161/0x2d0 [ 43.922936][ T6776] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 43.928969][ T6776] __do_sys_exit_group+0x13/0x20 [ 43.933874][ T6776] __se_sys_exit_group+0x10/0x10 [ 43.938781][ T6776] __x64_sys_exit_group+0x37/0x40 [ 43.943776][ T6776] do_syscall_64+0x73/0xe0 [ 43.948170][ T6776] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 43.954030][ T6776] RIP: 0033:0x446c88 [ 43.957888][ T6776] Code: Bad RIP value. [ 43.961932][ T6776] RSP: 002b:00007fff791accb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 43.970310][ T6776] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000446c88 [ 43.978253][ T6776] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 43.986194][ T6776] RBP: 00000000004ca370 R08: 00000000000000e7 R09: ffffffffffffffd4 [ 43.994145][ T6776] R10: 00007fff791acbd0 R11: 0000000000000246 R12: 0000000000000001 [ 44.002098][ T6776] R13: 00000000006dda40 R14: 0000000000000000 R15: 0000000000000000 [ 44.011230][ T6776] Kernel Offset: disabled [ 44.015559][ T6776] Rebooting in 86400 seconds..