[ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.87' (ECDSA) to the list of known hosts. 2020/05/23 16:08:36 parsed 1 programs 2020/05/23 16:08:36 executed programs: 0 syzkaller login: [ 56.357812][ T6848] IPVS: ftp: loaded support on port[0] = 21 [ 56.457506][ T6848] chnl_net:caif_netlink_parms(): no params data found [ 56.507899][ T6848] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.515483][ T6848] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.525085][ T6848] device bridge_slave_0 entered promiscuous mode [ 56.534457][ T6848] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.543005][ T6848] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.551087][ T6848] device bridge_slave_1 entered promiscuous mode [ 56.573831][ T6848] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 56.584939][ T6848] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 56.608277][ T6848] team0: Port device team_slave_0 added [ 56.615758][ T6848] team0: Port device team_slave_1 added [ 56.634154][ T6848] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 56.641366][ T6848] 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. [ 56.668265][ T6848] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 56.680786][ T6848] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 56.687970][ T6848] 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. [ 56.713993][ T6848] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 56.781524][ T6848] device hsr_slave_0 entered promiscuous mode [ 56.837083][ T6848] device hsr_slave_1 entered promiscuous mode [ 56.966312][ T6848] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 57.030115][ T6848] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 57.089483][ T6848] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 57.139971][ T6848] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 57.203956][ T6848] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.211149][ T6848] bridge0: port 2(bridge_slave_1) entered forwarding state [ 57.219230][ T6848] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.226316][ T6848] bridge0: port 1(bridge_slave_0) entered forwarding state [ 57.274954][ T6848] 8021q: adding VLAN 0 to HW filter on device bond0 [ 57.288793][ T3690] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 57.299617][ T3690] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.308137][ T3690] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.315921][ T3690] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 57.330095][ T6848] 8021q: adding VLAN 0 to HW filter on device team0 [ 57.341736][ T3690] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 57.351270][ T3690] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.358400][ T3690] bridge0: port 1(bridge_slave_0) entered forwarding state [ 57.371921][ T2612] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 57.380534][ T2612] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.387647][ T2612] bridge0: port 2(bridge_slave_1) entered forwarding state [ 57.408095][ T3690] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 57.417317][ T3690] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 57.434732][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 57.443276][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 57.456893][ T6848] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 57.469732][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 57.478722][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 57.487976][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 57.507803][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 57.507942][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 57.533018][ T6848] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 57.553738][ T3690] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 57.562960][ T3690] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 57.585207][ T6848] device veth0_vlan entered promiscuous mode [ 57.592795][ T3687] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 57.602351][ T3687] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 57.612056][ T3687] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 57.620646][ T3687] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 57.632625][ T6848] device veth1_vlan entered promiscuous mode [ 57.653633][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 57.661868][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 57.670239][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 57.678964][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 57.690516][ T6848] device veth0_macvtap entered promiscuous mode [ 57.701320][ T6848] device veth1_macvtap entered promiscuous mode [ 57.721077][ T6848] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 57.728563][ T3687] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 57.739288][ T3687] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 57.747516][ T3687] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 57.755994][ T3687] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 57.769612][ T6848] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 57.777061][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 57.785533][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 57.973933][ T7056] ubi0: attaching mtd0 [ 57.979205][ T7056] ubi0: scanning is finished [ 57.983892][ T7056] ubi0: empty MTD device detected [ 58.047624][ T7056] ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) [ 58.055149][ T7056] ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes [ 58.066267][ T7056] ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 [ 58.073228][ T7056] ubi0: VID header offset: 64 (aligned 64), data offset: 128 [ 58.082420][ T7056] ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 [ 58.089837][ T7056] ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 [ 58.099093][ T7056] ubi0: max/mean erase counter: 0/0, WL threshold: 4096, image sequence number: 1578926863 [ 58.110010][ T7056] ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 [ 58.121561][ T7060] ubi0: background thread "ubi_bgt0d" started, PID 7060 [ 58.144846][ T7062] ubi0: detaching mtd0 [ 58.154422][ T7062] ================================================================== [ 58.162647][ T7062] BUG: KASAN: use-after-free in uif_close+0x15e/0x190 [ 58.169412][ T7062] Read of size 4 at addr ffff88809abf09e8 by task syz-executor.0/7062 [ 58.177556][ T7062] [ 58.179894][ T7062] CPU: 0 PID: 7062 Comm: syz-executor.0 Not tainted 5.7.0-rc6-next-20200522-syzkaller #0 [ 58.189686][ T7062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.199741][ T7062] Call Trace: [ 58.203036][ T7062] dump_stack+0x18f/0x20d [ 58.207376][ T7062] ? uif_close+0x15e/0x190 [ 58.211796][ T7062] ? uif_close+0x15e/0x190 [ 58.216225][ T7062] print_address_description.constprop.0.cold+0xd3/0x413 [ 58.223336][ T7062] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 58.229327][ T7062] ? vprintk_func+0x97/0x1a6 [ 58.233921][ T7062] ? uif_close+0x15e/0x190 [ 58.238317][ T7062] kasan_report.cold+0x1f/0x37 [ 58.243064][ T7062] ? uif_close+0x15e/0x190 [ 58.247462][ T7062] uif_close+0x15e/0x190 [ 58.251728][ T7062] ubi_detach_mtd_dev+0x226/0x432 [ 58.256737][ T7062] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 58.261478][ T7062] ? vol_cdev_llseek+0x160/0x160 [ 58.266395][ T7062] ? firmware_map_remove+0x19e/0x19e [ 58.271674][ T7062] ? vol_cdev_llseek+0x160/0x160 [ 58.276589][ T7062] ksys_ioctl+0x11a/0x180 [ 58.280896][ T7062] __x64_sys_ioctl+0x6f/0xb0 [ 58.285462][ T7062] do_syscall_64+0xf6/0x7d0 [ 58.289942][ T7062] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 58.295811][ T7062] RIP: 0033:0x45ca29 [ 58.299684][ T7062] Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 58.319263][ T7062] RSP: 002b:00007ffd5a5ff018 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 58.327649][ T7062] RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 [ 58.335609][ T7062] RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 [ 58.343559][ T7062] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 [ 58.351506][ T7062] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 58.359456][ T7062] R13: 0000000000000209 R14: 00000000004c44c1 R15: 0000000001d9a914 [ 58.367410][ T7062] [ 58.369715][ T7062] Allocated by task 7056: [ 58.374024][ T7062] save_stack+0x1b/0x40 [ 58.378156][ T7062] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 58.383761][ T7062] kmem_cache_alloc_trace+0x153/0x7d0 [ 58.389108][ T7062] ubi_attach_mtd_dev+0x2e7/0x27c0 [ 58.394196][ T7062] ctrl_cdev_ioctl+0x229/0x2b0 [ 58.399004][ T7062] ksys_ioctl+0x11a/0x180 [ 58.403331][ T7062] __x64_sys_ioctl+0x6f/0xb0 [ 58.407905][ T7062] do_syscall_64+0xf6/0x7d0 [ 58.412432][ T7062] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 58.418384][ T7062] [ 58.420691][ T7062] Freed by task 7062: [ 58.424647][ T7062] save_stack+0x1b/0x40 [ 58.428795][ T7062] __kasan_slab_free+0xf7/0x140 [ 58.433618][ T7062] kfree+0x109/0x2b0 [ 58.437575][ T7062] device_release+0x71/0x200 [ 58.442157][ T7062] kobject_put+0x1c8/0x2f0 [ 58.446563][ T7062] cdev_device_del+0x69/0x80 [ 58.451135][ T7062] uif_close+0xea/0x190 [ 58.455271][ T7062] ubi_detach_mtd_dev+0x226/0x432 [ 58.460272][ T7062] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 58.465015][ T7062] ksys_ioctl+0x11a/0x180 [ 58.469319][ T7062] __x64_sys_ioctl+0x6f/0xb0 [ 58.474320][ T7062] do_syscall_64+0xf6/0x7d0 [ 58.478886][ T7062] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 58.484765][ T7062] [ 58.487073][ T7062] The buggy address belongs to the object at ffff88809abf0000 [ 58.487073][ T7062] which belongs to the cache kmalloc-8k of size 8192 [ 58.501100][ T7062] The buggy address is located 2536 bytes inside of [ 58.501100][ T7062] 8192-byte region [ffff88809abf0000, ffff88809abf2000) [ 58.514518][ T7062] The buggy address belongs to the page: [ 58.520130][ T7062] page:ffffea00026afc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00026afc00 order:2 compound_mapcount:0 compound_pincount:0 [ 58.535286][ T7062] flags: 0xfffe0000010200(slab|head) [ 58.540548][ T7062] raw: 00fffe0000010200 ffffea00024e3e08 ffffea0002623408 ffff8880aa0021c0 [ 58.549109][ T7062] raw: 0000000000000000 ffff88809abf0000 0000000100000001 0000000000000000 [ 58.557662][ T7062] page dumped because: kasan: bad access detected [ 58.564044][ T7062] [ 58.566347][ T7062] Memory state around the buggy address: [ 58.571952][ T7062] ffff88809abf0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 58.580007][ T7062] ffff88809abf0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 58.588224][ T7062] >ffff88809abf0980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 58.596285][ T7062] ^ [ 58.603712][ T7062] ffff88809abf0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 58.611750][ T7062] ffff88809abf0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 58.619798][ T7062] ================================================================== [ 58.627846][ T7062] Disabling lock debugging due to kernel taint [ 58.650992][ T7062] Kernel panic - not syncing: panic_on_warn set ... [ 58.657608][ T7062] CPU: 0 PID: 7062 Comm: syz-executor.0 Tainted: G B 5.7.0-rc6-next-20200522-syzkaller #0 [ 58.668783][ T7062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.678922][ T7062] Call Trace: [ 58.682346][ T7062] dump_stack+0x18f/0x20d [ 58.686672][ T7062] ? uif_close+0x110/0x190 [ 58.691065][ T7062] panic+0x2e3/0x75c [ 58.694935][ T7062] ? __warn_printk+0xf3/0xf3 [ 58.699507][ T7062] ? preempt_schedule_common+0x5e/0xc0 [ 58.704956][ T7062] ? uif_close+0x15e/0x190 [ 58.709361][ T7062] ? uif_close+0x15e/0x190 [ 58.713764][ T7062] ? preempt_schedule_thunk+0x16/0x18 [ 58.719116][ T7062] ? trace_hardirqs_on+0x55/0x230 [ 58.724117][ T7062] ? uif_close+0x15e/0x190 [ 58.728507][ T7062] ? uif_close+0x15e/0x190 [ 58.732899][ T7062] end_report+0x4d/0x53 [ 58.737029][ T7062] kasan_report.cold+0xd/0x37 [ 58.741722][ T7062] ? uif_close+0x15e/0x190 [ 58.746111][ T7062] uif_close+0x15e/0x190 [ 58.750332][ T7062] ubi_detach_mtd_dev+0x226/0x432 [ 58.755361][ T7062] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 58.760377][ T7062] ? vol_cdev_llseek+0x160/0x160 [ 58.765293][ T7062] ? firmware_map_remove+0x19e/0x19e [ 58.770556][ T7062] ? vol_cdev_llseek+0x160/0x160 [ 58.775470][ T7062] ksys_ioctl+0x11a/0x180 [ 58.779777][ T7062] __x64_sys_ioctl+0x6f/0xb0 [ 58.784429][ T7062] do_syscall_64+0xf6/0x7d0 [ 58.788965][ T7062] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 58.794833][ T7062] RIP: 0033:0x45ca29 [ 58.798704][ T7062] Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 58.818302][ T7062] RSP: 002b:00007ffd5a5ff018 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 58.826805][ T7062] RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 [ 58.834755][ T7062] RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 [ 58.842709][ T7062] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 [ 58.851264][ T7062] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 58.859211][ T7062] R13: 0000000000000209 R14: 00000000004c44c1 R15: 0000000001d9a914 [ 58.868343][ T7062] Kernel Offset: disabled [ 58.872660][ T7062] Rebooting in 86400 seconds..