[ 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 '10.128.0.180' (ECDSA) to the list of known hosts. syzkaller login: [ 44.041550][ T7018] IPVS: ftp: loaded support on port[0] = 21 [ 44.124142][ T7018] chnl_net:caif_netlink_parms(): no params data found [ 44.171218][ T7018] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.179605][ T7018] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.188857][ T7018] device bridge_slave_0 entered promiscuous mode [ 44.198160][ T7018] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.205985][ T7018] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.214236][ T7018] device bridge_slave_1 entered promiscuous mode [ 44.233950][ T7018] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 44.244685][ T7018] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 44.265534][ T7018] team0: Port device team_slave_0 added [ 44.273950][ T7018] team0: Port device team_slave_1 added [ 44.290386][ T7018] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 44.297435][ T7018] 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. [ 44.324408][ T7018] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 44.337120][ T7018] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 44.344769][ T7018] 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. [ 44.371545][ T7018] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 44.443646][ T7018] device hsr_slave_0 entered promiscuous mode [ 44.491925][ T7018] device hsr_slave_1 entered promiscuous mode [ 44.603388][ T7018] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 44.654538][ T7018] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 44.723327][ T7018] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 44.764096][ T7018] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 44.824596][ T7018] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.832094][ T7018] bridge0: port 2(bridge_slave_1) entered forwarding state [ 44.840194][ T7018] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.847462][ T7018] bridge0: port 1(bridge_slave_0) entered forwarding state [ 44.886481][ T7018] 8021q: adding VLAN 0 to HW filter on device bond0 [ 44.899848][ T3555] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 44.910254][ T3555] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.918978][ T3555] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.927955][ T3555] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 44.941897][ T7018] 8021q: adding VLAN 0 to HW filter on device team0 [ 44.952751][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 44.962258][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.969311][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 45.002346][ T3555] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 45.010709][ T3555] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.017928][ T3555] bridge0: port 2(bridge_slave_1) entered forwarding state [ 45.026434][ T3555] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 45.035350][ T3555] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 45.043893][ T3555] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 45.052415][ T3555] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 45.068737][ T7018] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 45.080846][ T7018] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 45.090581][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 45.107586][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 45.115149][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 45.128718][ T7018] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 45.145259][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 45.154285][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 45.174940][ T7018] device veth0_vlan entered promiscuous mode [ 45.182006][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 45.190521][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 45.201941][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 45.209645][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 45.225100][ T7018] device veth1_vlan entered promiscuous mode [ 45.244551][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 45.252923][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 45.260778][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 45.270202][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 45.281836][ T7018] device veth0_macvtap entered promiscuous mode [ 45.290974][ T7018] device veth1_macvtap entered promiscuous mode [ 45.307415][ T7018] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 45.315480][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 45.324305][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 45.332731][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 45.342695][ T2771] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 45.355187][ T7018] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 45.362516][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 45.372755][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 45.536128][ T29] audit: type=1800 audit(1590258786.257:2): pid=7018 uid=0 auid=0 ses=5 subj=_ op=collect_data cause=failed(directio) comm="syz-executor361" name="file0" dev="sda1" ino=15703 res=0 [ 45.545459][ T7018] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 45.583099][ T7018] Process accounting resumed [ 45.592597][ T7018] ================================================================== [ 45.600806][ T7018] BUG: KASAN: use-after-free in get_block+0x69a/0x1600 [ 45.607807][ T7018] Read of size 2 at addr ffff888091744644 by task syz-executor361/7018 [ 45.616048][ T7018] [ 45.618463][ T7018] CPU: 1 PID: 7018 Comm: syz-executor361 Not tainted 5.7.0-rc6-syzkaller #0 [ 45.627126][ T7018] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.637181][ T7018] Call Trace: [ 45.640458][ T7018] dump_stack+0x1e9/0x30e [ 45.644768][ T7018] print_address_description+0x74/0x5c0 [ 45.650287][ T7018] ? printk+0x62/0x83 [ 45.654264][ T7018] ? vprintk_emit+0x339/0x3c0 [ 45.658929][ T7018] __kasan_report+0x103/0x1a0 [ 45.663648][ T7018] ? get_block+0x69a/0x1600 [ 45.668141][ T7018] ? get_block+0x69a/0x1600 [ 45.672631][ T7018] kasan_report+0x4d/0x80 [ 45.676939][ T7018] ? get_block+0x69a/0x1600 [ 45.681536][ T7018] ? minix_get_block+0x90/0xf0 [ 45.686310][ T7018] ? __block_write_begin_int+0x708/0x1a00 [ 45.692025][ T7018] ? minix_prepare_chunk+0x30/0x30 [ 45.697108][ T7018] ? wait_for_stable_page+0x10f/0x150 [ 45.702453][ T7018] ? minix_prepare_chunk+0x30/0x30 [ 45.707637][ T7018] ? block_write_begin+0x59/0x280 [ 45.712635][ T7018] ? minix_write_begin+0x38/0x1f0 [ 45.717635][ T7018] ? generic_perform_write+0x23b/0x4e0 [ 45.723196][ T7018] ? __generic_file_write_iter+0x22b/0x4e0 [ 45.729027][ T7018] ? down_write+0xcd/0x130 [ 45.733439][ T7018] ? generic_file_write_iter+0x4a6/0x650 [ 45.739066][ T7018] ? __vfs_write+0x54c/0x710 [ 45.743670][ T7018] ? __kernel_write+0x120/0x350 [ 45.748511][ T7018] ? do_acct_process+0xec6/0x12b0 [ 45.753530][ T7018] ? acct_process+0x468/0x570 [ 45.758188][ T7018] ? do_exit+0x57c/0x1f80 [ 45.762610][ T7018] ? do_group_exit+0x15e/0x2c0 [ 45.767488][ T7018] ? trace_irq_disable_rcuidle+0x1f/0x1d0 [ 45.773188][ T7018] ? __do_sys_exit_group+0x13/0x20 [ 45.778287][ T7018] ? __se_sys_exit_group+0x10/0x10 [ 45.783423][ T7018] ? __x64_sys_exit_group+0x37/0x40 [ 45.788636][ T7018] ? do_syscall_64+0xf3/0x1b0 [ 45.793298][ T7018] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 45.799342][ T7018] [ 45.801645][ T7018] Allocated by task 4109: [ 45.805954][ T7018] __kasan_kmalloc+0x114/0x160 [ 45.810708][ T7018] kmem_cache_alloc+0x1f5/0x2d0 [ 45.815545][ T7018] getname_flags+0xb8/0x610 [ 45.820040][ T7018] user_path_at_empty+0x28/0x50 [ 45.824884][ T7018] do_faccessat+0x2ca/0x780 [ 45.829364][ T7018] do_syscall_64+0xf3/0x1b0 [ 45.833844][ T7018] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 45.839715][ T7018] [ 45.842059][ T7018] Freed by task 4109: [ 45.846032][ T7018] __kasan_slab_free+0x125/0x190 [ 45.851004][ T7018] kmem_cache_free+0x7e/0xf0 [ 45.855584][ T7018] filename_lookup+0x410/0x5d0 [ 45.860574][ T7018] do_faccessat+0x2ca/0x780 [ 45.865063][ T7018] do_syscall_64+0xf3/0x1b0 [ 45.869585][ T7018] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 45.875471][ T7018] [ 45.877776][ T7018] The buggy address belongs to the object at ffff888091744200 [ 45.877776][ T7018] which belongs to the cache names_cache of size 4096 [ 45.891995][ T7018] The buggy address is located 1092 bytes inside of [ 45.891995][ T7018] 4096-byte region [ffff888091744200, ffff888091745200) [ 45.905419][ T7018] The buggy address belongs to the page: [ 45.911042][ T7018] page:ffffea000245d100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea000245d100 order:1 compound_mapcount:0 [ 45.924470][ T7018] flags: 0xfffe0000010200(slab|head) [ 45.929747][ T7018] raw: 00fffe0000010200 ffffea00024e3b08 ffffea0002457588 ffff8880aa600c40 [ 45.938322][ T7018] raw: 0000000000000000 ffff888091744200 0000000100000001 0000000000000000 [ 45.946893][ T7018] page dumped because: kasan: bad access detected [ 45.953300][ T7018] [ 45.955601][ T7018] Memory state around the buggy address: [ 45.961212][ T7018] ffff888091744500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.969270][ T7018] ffff888091744580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.977329][ T7018] >ffff888091744600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.985380][ T7018] ^ [ 45.991506][ T7018] ffff888091744680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.999569][ T7018] ffff888091744700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 46.007909][ T7018] ================================================================== [ 46.016055][ T7018] Disabling lock debugging due to kernel taint [ 46.023566][ T7018] Kernel panic - not syncing: panic_on_warn set ... [ 46.030166][ T7018] CPU: 1 PID: 7018 Comm: syz-executor361 Tainted: G B 5.7.0-rc6-syzkaller #0 [ 46.040217][ T7018] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.050275][ T7018] Call Trace: [ 46.053590][ T7018] dump_stack+0x1e9/0x30e [ 46.059250][ T7018] panic+0x264/0x7a0 [ 46.063143][ T7018] ? trace_hardirqs_on+0x30/0x70 [ 46.068103][ T7018] ? _raw_spin_unlock_irqrestore+0xa5/0xd0 [ 46.073891][ T7018] __kasan_report+0x191/0x1a0 [ 46.078542][ T7018] ? get_block+0x69a/0x1600 [ 46.083015][ T7018] ? get_block+0x69a/0x1600 [ 46.087504][ T7018] kasan_report+0x4d/0x80 [ 46.091818][ T7018] ? get_block+0x69a/0x1600 [ 46.096299][ T7018] ? minix_get_block+0x90/0xf0 [ 46.101043][ T7018] ? __block_write_begin_int+0x708/0x1a00 [ 46.106747][ T7018] ? minix_prepare_chunk+0x30/0x30 [ 46.111831][ T7018] ? wait_for_stable_page+0x10f/0x150 [ 46.117172][ T7018] ? minix_prepare_chunk+0x30/0x30 [ 46.122254][ T7018] ? block_write_begin+0x59/0x280 [ 46.127270][ T7018] ? minix_write_begin+0x38/0x1f0 [ 46.132311][ T7018] ? generic_perform_write+0x23b/0x4e0 [ 46.137748][ T7018] ? __generic_file_write_iter+0x22b/0x4e0 [ 46.143527][ T7018] ? down_write+0xcd/0x130 [ 46.147934][ T7018] ? generic_file_write_iter+0x4a6/0x650 [ 46.153539][ T7018] ? __vfs_write+0x54c/0x710 [ 46.158208][ T7018] ? __kernel_write+0x120/0x350 [ 46.163137][ T7018] ? do_acct_process+0xec6/0x12b0 [ 46.168338][ T7018] ? acct_process+0x468/0x570 [ 46.173030][ T7018] ? do_exit+0x57c/0x1f80 [ 46.177352][ T7018] ? do_group_exit+0x15e/0x2c0 [ 46.182105][ T7018] ? trace_irq_disable_rcuidle+0x1f/0x1d0 [ 46.187828][ T7018] ? __do_sys_exit_group+0x13/0x20 [ 46.192925][ T7018] ? __se_sys_exit_group+0x10/0x10 [ 46.198007][ T7018] ? __x64_sys_exit_group+0x37/0x40 [ 46.203175][ T7018] ? do_syscall_64+0xf3/0x1b0 [ 46.207822][ T7018] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 46.215182][ T7018] Kernel Offset: disabled [ 46.219502][ T7018] Rebooting in 86400 seconds..