[ OK ] Started Getty on tty1. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.44' (ECDSA) to the list of known hosts. 2020/05/23 04:33:42 parsed 1 programs 2020/05/23 04:33:42 executed programs: 0 syzkaller login: [ 57.318634][ T6823] IPVS: ftp: loaded support on port[0] = 21 [ 57.418410][ T6823] chnl_net:caif_netlink_parms(): no params data found [ 57.474715][ T6823] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.482916][ T6823] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.493148][ T6823] device bridge_slave_0 entered promiscuous mode [ 57.503926][ T6823] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.511217][ T6823] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.519093][ T6823] device bridge_slave_1 entered promiscuous mode [ 57.540753][ T6823] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 57.552387][ T6823] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 57.574703][ T6823] team0: Port device team_slave_0 added [ 57.583673][ T6823] team0: Port device team_slave_1 added [ 57.600705][ T6823] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 57.607944][ T6823] 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. [ 57.635437][ T6823] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 57.648564][ T6823] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 57.656174][ T6823] 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. [ 57.682730][ T6823] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 57.753955][ T6823] device hsr_slave_0 entered promiscuous mode [ 57.801242][ T6823] device hsr_slave_1 entered promiscuous mode [ 57.929533][ T6823] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 57.974039][ T6823] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 58.034519][ T6823] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 58.113127][ T6823] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 58.198229][ T6823] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.205602][ T6823] bridge0: port 2(bridge_slave_1) entered forwarding state [ 58.213577][ T6823] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.220744][ T6823] bridge0: port 1(bridge_slave_0) entered forwarding state [ 58.264820][ T6823] 8021q: adding VLAN 0 to HW filter on device bond0 [ 58.278854][ T2495] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 58.289158][ T2495] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.297775][ T2495] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.306882][ T2495] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 58.320470][ T6823] 8021q: adding VLAN 0 to HW filter on device team0 [ 58.332217][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 58.332711][ T3360] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.347456][ T3360] bridge0: port 1(bridge_slave_0) entered forwarding state [ 58.358563][ T2495] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 58.368247][ T2495] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.375354][ T2495] bridge0: port 2(bridge_slave_1) entered forwarding state [ 58.403052][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 58.412249][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 58.420550][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 58.429912][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 58.442840][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 58.451344][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 58.464301][ T6823] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 58.485816][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 58.493952][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 58.508986][ T6823] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 58.529760][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 58.539402][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 58.561014][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 58.569440][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 58.578959][ T6823] device veth0_vlan entered promiscuous mode [ 58.587174][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 58.595367][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 58.608849][ T6823] device veth1_vlan entered promiscuous mode [ 58.635115][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 58.643757][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 58.652868][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 58.662611][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 58.675129][ T6823] device veth0_macvtap entered promiscuous mode [ 58.685658][ T6823] device veth1_macvtap entered promiscuous mode [ 58.703567][ T6823] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 58.711531][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 58.719764][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 58.728736][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 58.737935][ T3360] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 58.750144][ T6823] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 58.759723][ T2590] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 58.769672][ T2590] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 58.949235][ T7032] ubi0: attaching mtd0 [ 58.954741][ T7032] ubi0: scanning is finished [ 58.959412][ T7032] ubi0: empty MTD device detected [ 59.018833][ T7032] ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) [ 59.026775][ T7032] ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes [ 59.036064][ T7032] ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 [ 59.043954][ T7032] ubi0: VID header offset: 64 (aligned 64), data offset: 128 [ 59.052892][ T7032] ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 [ 59.059668][ T7032] ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 [ 59.068398][ T7032] ubi0: max/mean erase counter: 0/0, WL threshold: 4096, image sequence number: 3467325286 [ 59.079554][ T7032] ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 [ 59.090598][ T7036] ubi0: background thread "ubi_bgt0d" started, PID 7036 [ 59.115918][ T7038] ubi0: detaching mtd0 [ 59.126603][ T7038] ================================================================== [ 59.134823][ T7038] BUG: KASAN: use-after-free in uif_close+0x15e/0x190 [ 59.141598][ T7038] Read of size 4 at addr ffff8880935589e8 by task syz-executor.0/7038 [ 59.149740][ T7038] [ 59.152219][ T7038] CPU: 0 PID: 7038 Comm: syz-executor.0 Not tainted 5.7.0-rc6-next-20200522-syzkaller #0 [ 59.162027][ T7038] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.172061][ T7038] Call Trace: [ 59.175333][ T7038] dump_stack+0x18f/0x20d [ 59.179660][ T7038] ? uif_close+0x15e/0x190 [ 59.184070][ T7038] ? uif_close+0x15e/0x190 [ 59.188492][ T7038] print_address_description.constprop.0.cold+0xd3/0x413 [ 59.196134][ T7038] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 59.202298][ T7038] ? vprintk_func+0x97/0x1a6 [ 59.206896][ T7038] ? uif_close+0x15e/0x190 [ 59.211316][ T7038] kasan_report.cold+0x1f/0x37 [ 59.216111][ T7038] ? uif_close+0x15e/0x190 [ 59.220518][ T7038] uif_close+0x15e/0x190 [ 59.224758][ T7038] ubi_detach_mtd_dev+0x226/0x432 [ 59.229783][ T7038] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 59.234529][ T7038] ? vol_cdev_llseek+0x160/0x160 [ 59.239443][ T7038] ? __x64_sys_futex+0x380/0x4f0 [ 59.244367][ T7038] ? vol_cdev_llseek+0x160/0x160 [ 59.249284][ T7038] ksys_ioctl+0x11a/0x180 [ 59.253614][ T7038] __x64_sys_ioctl+0x6f/0xb0 [ 59.258201][ T7038] do_syscall_64+0xf6/0x7d0 [ 59.262707][ T7038] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.268582][ T7038] RIP: 0033:0x45ca29 [ 59.272454][ T7038] 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 [ 59.292060][ T7038] RSP: 002b:00007ffcedf8c3d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 59.300454][ T7038] RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 [ 59.308437][ T7038] RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 [ 59.316391][ T7038] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 [ 59.324338][ T7038] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 59.332305][ T7038] R13: 0000000000000209 R14: 00000000004c44c1 R15: 0000000001801914 [ 59.340263][ T7038] [ 59.342568][ T7038] Allocated by task 7032: [ 59.346894][ T7038] save_stack+0x1b/0x40 [ 59.351032][ T7038] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 59.356725][ T7038] kmem_cache_alloc_trace+0x153/0x7d0 [ 59.362075][ T7038] ubi_attach_mtd_dev+0x2e7/0x27c0 [ 59.367162][ T7038] ctrl_cdev_ioctl+0x229/0x2b0 [ 59.371920][ T7038] ksys_ioctl+0x11a/0x180 [ 59.376224][ T7038] __x64_sys_ioctl+0x6f/0xb0 [ 59.380802][ T7038] do_syscall_64+0xf6/0x7d0 [ 59.385300][ T7038] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.391164][ T7038] [ 59.393487][ T7038] Freed by task 7038: [ 59.397446][ T7038] save_stack+0x1b/0x40 [ 59.401598][ T7038] __kasan_slab_free+0xf7/0x140 [ 59.406425][ T7038] kfree+0x109/0x2b0 [ 59.410298][ T7038] device_release+0x71/0x200 [ 59.414873][ T7038] kobject_put+0x1c8/0x2f0 [ 59.419267][ T7038] cdev_device_del+0x69/0x80 [ 59.423833][ T7038] uif_close+0xea/0x190 [ 59.427966][ T7038] ubi_detach_mtd_dev+0x226/0x432 [ 59.432968][ T7038] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 59.437708][ T7038] ksys_ioctl+0x11a/0x180 [ 59.442014][ T7038] __x64_sys_ioctl+0x6f/0xb0 [ 59.446580][ T7038] do_syscall_64+0xf6/0x7d0 [ 59.451062][ T7038] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.456925][ T7038] [ 59.459232][ T7038] The buggy address belongs to the object at ffff888093558000 [ 59.459232][ T7038] which belongs to the cache kmalloc-8k of size 8192 [ 59.473265][ T7038] The buggy address is located 2536 bytes inside of [ 59.473265][ T7038] 8192-byte region [ffff888093558000, ffff88809355a000) [ 59.486712][ T7038] The buggy address belongs to the page: [ 59.492351][ T7038] page:ffffea00024d5600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00024d5600 order:2 compound_mapcount:0 compound_pincount:0 [ 59.507507][ T7038] flags: 0xfffe0000010200(slab|head) [ 59.512770][ T7038] raw: 00fffe0000010200 ffffea00024d3d08 ffff8880aa001b50 ffff8880aa0021c0 [ 59.521358][ T7038] raw: 0000000000000000 ffff888093558000 0000000100000001 0000000000000000 [ 59.529942][ T7038] page dumped because: kasan: bad access detected [ 59.536328][ T7038] [ 59.538660][ T7038] Memory state around the buggy address: [ 59.544274][ T7038] ffff888093558880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.552335][ T7038] ffff888093558900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.560381][ T7038] >ffff888093558980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.568574][ T7038] ^ [ 59.576085][ T7038] ffff888093558a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.584136][ T7038] ffff888093558a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 59.592246][ T7038] ================================================================== [ 59.600281][ T7038] Disabling lock debugging due to kernel taint [ 59.628059][ T7038] Kernel panic - not syncing: panic_on_warn set ... [ 59.634782][ T7038] CPU: 0 PID: 7038 Comm: syz-executor.0 Tainted: G B 5.7.0-rc6-next-20200522-syzkaller #0 [ 59.645973][ T7038] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.656224][ T7038] Call Trace: [ 59.659499][ T7038] dump_stack+0x18f/0x20d [ 59.663871][ T7038] ? uif_close+0x110/0x190 [ 59.668274][ T7038] panic+0x2e3/0x75c [ 59.672150][ T7038] ? __warn_printk+0xf3/0xf3 [ 59.676719][ T7038] ? preempt_schedule_common+0x5e/0xc0 [ 59.682173][ T7038] ? uif_close+0x15e/0x190 [ 59.686574][ T7038] ? uif_close+0x15e/0x190 [ 59.690966][ T7038] ? preempt_schedule_thunk+0x16/0x18 [ 59.696316][ T7038] ? trace_hardirqs_on+0x55/0x230 [ 59.701414][ T7038] ? uif_close+0x15e/0x190 [ 59.705821][ T7038] ? uif_close+0x15e/0x190 [ 59.710230][ T7038] end_report+0x4d/0x53 [ 59.714365][ T7038] kasan_report.cold+0xd/0x37 [ 59.719040][ T7038] ? uif_close+0x15e/0x190 [ 59.723432][ T7038] uif_close+0x15e/0x190 [ 59.727659][ T7038] ubi_detach_mtd_dev+0x226/0x432 [ 59.732688][ T7038] ctrl_cdev_ioctl+0x1bf/0x2b0 [ 59.737442][ T7038] ? vol_cdev_llseek+0x160/0x160 [ 59.742357][ T7038] ? __x64_sys_futex+0x380/0x4f0 [ 59.747271][ T7038] ? vol_cdev_llseek+0x160/0x160 [ 59.752193][ T7038] ksys_ioctl+0x11a/0x180 [ 59.756517][ T7038] __x64_sys_ioctl+0x6f/0xb0 [ 59.761097][ T7038] do_syscall_64+0xf6/0x7d0 [ 59.765581][ T7038] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 59.771454][ T7038] RIP: 0033:0x45ca29 [ 59.775323][ T7038] 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 [ 59.794905][ T7038] RSP: 002b:00007ffcedf8c3d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 59.803298][ T7038] RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 [ 59.811251][ T7038] RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 [ 59.819289][ T7038] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 [ 59.827366][ T7038] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 59.835317][ T7038] R13: 0000000000000209 R14: 00000000004c44c1 R15: 0000000001801914 [ 59.844820][ T7038] Kernel Offset: disabled [ 59.849164][ T7038] Rebooting in 86400 seconds..