[ 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 '10.128.0.9' (ECDSA) to the list of known hosts. 2020/05/23 13:25:28 parsed 1 programs 2020/05/23 13:25:28 executed programs: 0 syzkaller login: [ 57.620670][ T6991] IPVS: ftp: loaded support on port[0] = 21 [ 57.721792][ T6991] chnl_net:caif_netlink_parms(): no params data found [ 57.775799][ T6991] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.784642][ T6991] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.792583][ T6991] device bridge_slave_0 entered promiscuous mode [ 57.802572][ T6991] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.811274][ T6991] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.819604][ T6991] device bridge_slave_1 entered promiscuous mode [ 57.840003][ T6991] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 57.852245][ T6991] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 57.876380][ T6991] team0: Port device team_slave_0 added [ 57.885230][ T6991] team0: Port device team_slave_1 added [ 57.904115][ T6991] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 57.911229][ T6991] 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. [ 57.938249][ T6991] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 57.951369][ T6991] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 57.959696][ T6991] 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. [ 57.986538][ T6991] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 58.056369][ T6991] device hsr_slave_0 entered promiscuous mode [ 58.103212][ T6991] device hsr_slave_1 entered promiscuous mode [ 58.242250][ T6991] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 58.286280][ T6991] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 58.355911][ T6991] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 58.414923][ T6991] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 58.470420][ T6991] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.478013][ T6991] bridge0: port 2(bridge_slave_1) entered forwarding state [ 58.486078][ T6991] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.493245][ T6991] bridge0: port 1(bridge_slave_0) entered forwarding state [ 58.541564][ T6991] 8021q: adding VLAN 0 to HW filter on device bond0 [ 58.556757][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 58.568336][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.577631][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.585956][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 58.599778][ T6991] 8021q: adding VLAN 0 to HW filter on device team0 [ 58.612108][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 58.621176][ T2977] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.628680][ T2977] bridge0: port 1(bridge_slave_0) entered forwarding state [ 58.640728][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 58.650076][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.657579][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 58.683307][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 58.691947][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 58.705814][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 58.713779][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 58.726837][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 58.735267][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 58.746568][ T6991] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 58.767797][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 58.775428][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 58.790232][ T6991] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 58.810390][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 58.819797][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 58.842182][ T6991] device veth0_vlan entered promiscuous mode [ 58.858722][ T6991] device veth1_vlan entered promiscuous mode [ 58.867316][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 58.876441][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 58.885067][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 58.896124][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 58.904255][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 58.926230][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 58.935056][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 58.944855][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 58.956933][ T6991] device veth0_macvtap entered promiscuous mode [ 58.968363][ T6991] device veth1_macvtap entered promiscuous mode [ 58.987066][ T6991] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 58.995461][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 59.005123][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 59.013983][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 59.022663][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 59.035000][ T6991] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 59.043625][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 59.053322][ T2977] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 59.241357][ T7200] ubi0: attaching mtd0 [ 59.247559][ T7200] ubi0: scanning is finished [ 59.252267][ T7200] ubi0: empty MTD device detected [ 59.323211][ T7200] ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) [ 59.330819][ T7200] ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes [ 59.339691][ T7200] ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 [ 59.347075][ T7200] ubi0: VID header offset: 64 (aligned 64), data offset: 128 [ 59.356343][ T7200] ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 [ 59.363724][ T7200] ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 [ 59.371974][ T7200] ubi0: max/mean erase counter: 0/0, WL threshold: 4096, image sequence number: 2059704709 [ 59.383481][ T7200] ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 [ 59.395333][ T7204] ubi0: background thread "ubi_bgt0d" started, PID 7204 [ 59.418766][ T7206] ubi0: detaching mtd0 [ 59.427926][ T7206] ================================================================== [ 59.436140][ T7206] BUG: KASAN: use-after-free in uif_close+0x15e/0x190 [ 59.443391][ T7206] Read of size 4 at addr ffff8880929689e8 by task syz-executor.0/7206 [ 59.451758][ T7206] [ 59.454277][ T7206] CPU: 0 PID: 7206 Comm: syz-executor.0 Not tainted 5.7.0-rc6-next-20200522-syzkaller #0 [ 59.464086][ T7206] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.474161][ T7206] Call Trace: [ 59.477475][ T7206] dump_stack+0x18f/0x20d [ 59.481840][ T7206] ? uif_close+0x15e/0x190 [ 59.486279][ T7206] ? uif_close+0x15e/0x190 [ 59.490720][ T7206] print_address_description.constprop.0.cold+0xd3/0x413 [ 59.497937][ T7206] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 59.503940][ T7206] ? vprintk_func+0x97/0x1a6 [ 59.508557][ T7206] ? uif_close+0x15e/0x190 [ 59.512991][ T7206] kasan_report.cold+0x1f/0x37 [ 59.517821][ T7206] ? uif_close+0x15e/0x190 [ 59.522238][ T7206] uif_close+0x15e/0x190 [ 59.526760][ T7206] ubi_detach_mtd_dev+0x226/0x432 [ 59.531777][ T7206] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 59.536630][ T7206] ? vol_cdev_llseek+0x160/0x160 [ 59.541681][ T7206] ? __x64_sys_futex+0x380/0x4f0 [ 59.546764][ T7206] ? vol_cdev_llseek+0x160/0x160 [ 59.551758][ T7206] ksys_ioctl+0x11a/0x180 [ 59.556284][ T7206] __x64_sys_ioctl+0x6f/0xb0 [ 59.560884][ T7206] do_syscall_64+0xf6/0x7d0 [ 59.565385][ T7206] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.571392][ T7206] RIP: 0033:0x45ca29 [ 59.575280][ T7206] 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 [ 59.594916][ T7206] RSP: 002b:00007ffd584e1968 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 59.603886][ T7206] RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 [ 59.612091][ T7206] RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 [ 59.620182][ T7206] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 [ 59.628493][ T7206] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 59.636618][ T7206] R13: 0000000000000209 R14: 00000000004c44c1 R15: 0000000002b8e914 [ 59.645165][ T7206] [ 59.647489][ T7206] Allocated by task 7200: [ 59.651813][ T7206] save_stack+0x1b/0x40 [ 59.656003][ T7206] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 59.661663][ T7206] kmem_cache_alloc_trace+0x153/0x7d0 [ 59.667033][ T7206] ubi_attach_mtd_dev+0x2e7/0x27c0 [ 59.672198][ T7206] ctrl_cdev_ioctl+0x229/0x2b0 [ 59.676983][ T7206] ksys_ioctl+0x11a/0x180 [ 59.681307][ T7206] __x64_sys_ioctl+0x6f/0xb0 [ 59.685998][ T7206] do_syscall_64+0xf6/0x7d0 [ 59.690549][ T7206] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.696430][ T7206] [ 59.698822][ T7206] Freed by task 7206: [ 59.702868][ T7206] save_stack+0x1b/0x40 [ 59.707013][ T7206] __kasan_slab_free+0xf7/0x140 [ 59.711905][ T7206] kfree+0x109/0x2b0 [ 59.715846][ T7206] device_release+0x71/0x200 [ 59.720431][ T7206] kobject_put+0x1c8/0x2f0 [ 59.724996][ T7206] cdev_device_del+0x69/0x80 [ 59.729620][ T7206] uif_close+0xea/0x190 [ 59.733769][ T7206] ubi_detach_mtd_dev+0x226/0x432 [ 59.738791][ T7206] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 59.743673][ T7206] ksys_ioctl+0x11a/0x180 [ 59.747996][ T7206] __x64_sys_ioctl+0x6f/0xb0 [ 59.752581][ T7206] do_syscall_64+0xf6/0x7d0 [ 59.757336][ T7206] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.763340][ T7206] [ 59.765673][ T7206] The buggy address belongs to the object at ffff888092968000 [ 59.765673][ T7206] which belongs to the cache kmalloc-8k of size 8192 [ 59.779792][ T7206] The buggy address is located 2536 bytes inside of [ 59.779792][ T7206] 8192-byte region [ffff888092968000, ffff88809296a000) [ 59.793621][ T7206] The buggy address belongs to the page: [ 59.799486][ T7206] page:ffffea00024a5a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00024a5a00 order:2 compound_mapcount:0 compound_pincount:0 [ 59.814835][ T7206] flags: 0xfffe0000010200(slab|head) [ 59.820190][ T7206] raw: 00fffe0000010200 ffffea00024ab308 ffffea0002342e08 ffff8880aa0021c0 [ 59.828777][ T7206] raw: 0000000000000000 ffff888092968000 0000000100000001 0000000000000000 [ 59.837574][ T7206] page dumped because: kasan: bad access detected [ 59.844148][ T7206] [ 59.846475][ T7206] Memory state around the buggy address: [ 59.852207][ T7206] ffff888092968880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.860504][ T7206] ffff888092968900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.868569][ T7206] >ffff888092968980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.876630][ T7206] ^ [ 59.884100][ T7206] ffff888092968a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.892443][ T7206] ffff888092968a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.892459][ T7206] ================================================================== [ 59.892463][ T7206] Disabling lock debugging due to kernel taint [ 59.901115][ T7206] Kernel panic - not syncing: panic_on_warn set ... [ 59.930027][ T7206] CPU: 0 PID: 7206 Comm: syz-executor.0 Tainted: G B 5.7.0-rc6-next-20200522-syzkaller #0 [ 59.941494][ T7206] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.951664][ T7206] Call Trace: [ 59.954959][ T7206] dump_stack+0x18f/0x20d [ 59.959517][ T7206] ? uif_close+0x110/0x190 [ 59.963928][ T7206] panic+0x2e3/0x75c [ 59.967818][ T7206] ? __warn_printk+0xf3/0xf3 [ 59.972416][ T7206] ? preempt_schedule_common+0x5e/0xc0 [ 59.977879][ T7206] ? uif_close+0x15e/0x190 [ 59.982285][ T7206] ? uif_close+0x15e/0x190 [ 59.986695][ T7206] ? preempt_schedule_thunk+0x16/0x18 [ 59.992210][ T7206] ? trace_hardirqs_on+0x55/0x230 [ 59.997238][ T7206] ? uif_close+0x15e/0x190 [ 60.001687][ T7206] ? uif_close+0x15e/0x190 [ 60.006140][ T7206] end_report+0x4d/0x53 [ 60.010292][ T7206] kasan_report.cold+0xd/0x37 [ 60.014998][ T7206] ? uif_close+0x15e/0x190 [ 60.019408][ T7206] uif_close+0x15e/0x190 [ 60.023945][ T7206] ubi_detach_mtd_dev+0x226/0x432 [ 60.029120][ T7206] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 60.034240][ T7206] ? vol_cdev_llseek+0x160/0x160 [ 60.039220][ T7206] ? __x64_sys_futex+0x380/0x4f0 [ 60.044153][ T7206] ? vol_cdev_llseek+0x160/0x160 [ 60.049082][ T7206] ksys_ioctl+0x11a/0x180 [ 60.053405][ T7206] __x64_sys_ioctl+0x6f/0xb0 [ 60.058162][ T7206] do_syscall_64+0xf6/0x7d0 [ 60.062702][ T7206] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 60.068670][ T7206] RIP: 0033:0x45ca29 [ 60.072562][ T7206] 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 [ 60.092400][ T7206] RSP: 002b:00007ffd584e1968 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 60.100824][ T7206] RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 [ 60.108914][ T7206] RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 [ 60.116997][ T7206] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 [ 60.125012][ T7206] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 60.132979][ T7206] R13: 0000000000000209 R14: 00000000004c44c1 R15: 0000000002b8e914 [ 60.142489][ T7206] Kernel Offset: disabled [ 60.146866][ T7206] Rebooting in 86400 seconds..