[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. 2020/07/28 05:33:03 parsed 1 programs 2020/07/28 05:33:03 executed programs: 0 syzkaller login: [ 58.527608][ T6820] IPVS: ftp: loaded support on port[0] = 21 [ 58.621276][ T6820] chnl_net:caif_netlink_parms(): no params data found [ 58.671101][ T6820] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.679284][ T6820] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.688906][ T6820] device bridge_slave_0 entered promiscuous mode [ 58.698394][ T6820] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.705464][ T6820] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.713950][ T6820] device bridge_slave_1 entered promiscuous mode [ 58.732932][ T6820] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 58.744073][ T6820] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 58.766307][ T6820] team0: Port device team_slave_0 added [ 58.773840][ T6820] team0: Port device team_slave_1 added [ 58.791164][ T6820] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 58.798226][ T6820] 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. [ 58.825036][ T6820] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 58.838403][ T6820] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 58.845344][ T6820] 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. [ 58.872035][ T6820] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 58.929376][ T6820] device hsr_slave_0 entered promiscuous mode [ 58.986739][ T6820] device hsr_slave_1 entered promiscuous mode [ 59.111034][ T6820] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 59.149763][ T6820] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 59.188876][ T6820] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 59.248476][ T6820] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 59.302348][ T6820] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.309577][ T6820] bridge0: port 2(bridge_slave_1) entered forwarding state [ 59.317564][ T6820] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.324623][ T6820] bridge0: port 1(bridge_slave_0) entered forwarding state [ 59.370509][ T6820] 8021q: adding VLAN 0 to HW filter on device bond0 [ 59.383402][ T2596] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 59.393988][ T2596] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.402034][ T2596] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.411196][ T2596] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 59.423995][ T6820] 8021q: adding VLAN 0 to HW filter on device team0 [ 59.434721][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 59.444232][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.451359][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 59.467641][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 59.476191][ T12] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.483326][ T12] bridge0: port 2(bridge_slave_1) entered forwarding state [ 59.499030][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 59.508218][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 59.520690][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 59.535989][ T6820] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 59.548786][ T6820] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 59.561113][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 59.570775][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 59.587354][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 59.597510][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 59.605156][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 59.619886][ T6820] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 59.640135][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 59.649146][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 59.668794][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 59.678280][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 59.689052][ T6820] device veth0_vlan entered promiscuous mode [ 59.705138][ T2596] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 59.713111][ T2596] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 59.723046][ T6820] device veth1_vlan entered promiscuous mode [ 59.743618][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 59.752626][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 59.760763][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 59.769317][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 59.780031][ T6820] device veth0_macvtap entered promiscuous mode [ 59.792112][ T6820] device veth1_macvtap entered promiscuous mode [ 59.808736][ T6820] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 59.816110][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 59.825940][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 59.834026][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 59.842999][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 59.855415][ T6820] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 59.863192][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 59.872154][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 60.605162][ T7036] ================================================================== [ 60.605209][ T7036] BUG: KASAN: slab-out-of-bounds in vc_do_resize+0x9d6/0x13f0 [ 60.605218][ T7036] Read of size 4 at addr ffff88809f9aa5e0 by task syz-executor.0/7036 [ 60.605220][ T7036] [ 60.605230][ T7036] CPU: 1 PID: 7036 Comm: syz-executor.0 Not tainted 5.8.0-rc7-syzkaller #0 [ 60.605236][ T7036] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.605239][ T7036] Call Trace: [ 60.605251][ T7036] dump_stack+0x18f/0x20d [ 60.605262][ T7036] ? vc_do_resize+0x9d6/0x13f0 [ 60.605271][ T7036] ? vc_do_resize+0x9d6/0x13f0 [ 60.605282][ T7036] print_address_description.constprop.0.cold+0xae/0x436 [ 60.605294][ T7036] ? lockdep_hardirqs_off+0x66/0xa0 [ 60.605304][ T7036] ? vprintk_func+0x97/0x1a6 [ 60.605315][ T7036] ? vc_do_resize+0x9d6/0x13f0 [ 60.605322][ T7036] kasan_report.cold+0x1f/0x37 [ 60.605333][ T7036] ? vc_do_resize+0x9d6/0x13f0 [ 60.605343][ T7036] check_memory_region+0x13d/0x180 [ 60.605351][ T7036] memcpy+0x20/0x60 [ 60.605361][ T7036] vc_do_resize+0x9d6/0x13f0 [ 60.605380][ T7036] ? store_bind+0x6a0/0x6a0 [ 60.605387][ T7036] ? memcpy+0x39/0x60 [ 60.605403][ T7036] fbcon_modechanged+0x36c/0x710 [ 60.605414][ T7036] fbcon_update_vcs+0x3a/0x50 [ 60.605424][ T7036] fb_set_var+0xae8/0xd60 [ 60.605435][ T7036] ? fb_blank+0x190/0x190 [ 60.605443][ T7036] ? lock_release+0x8d0/0x8d0 [ 60.605455][ T7036] ? lock_is_held_type+0xb0/0xe0 [ 60.605479][ T7036] ? do_fb_ioctl+0x2f2/0x6c0 [ 60.605509][ T7036] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 60.605525][ T7036] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.605540][ T7036] ? trace_hardirqs_on+0x5f/0x220 [ 60.605558][ T7036] do_fb_ioctl+0x33f/0x6c0 [ 60.605569][ T7036] ? fb_set_suspend+0x1a0/0x1a0 [ 60.605577][ T7036] ? lock_downgrade+0x820/0x820 [ 60.605588][ T7036] ? trace_hardirqs_on+0x5f/0x220 [ 60.605596][ T7036] ? lockdep_hardirqs_on+0x6a/0xe0 [ 60.605616][ T7036] ? tomoyo_path_number_perm+0x244/0x4d0 [ 60.605627][ T7036] ? tomoyo_execute_permission+0x470/0x470 [ 60.605637][ T7036] ? __might_fault+0xef/0x1d0 [ 60.605657][ T7036] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 60.605667][ T7036] ? do_vfs_ioctl+0x27d/0x1090 [ 60.605676][ T7036] ? generic_block_fiemap+0x60/0x60 [ 60.605687][ T7036] fb_compat_ioctl+0x175/0xc10 [ 60.605697][ T7036] ? fb_open+0x430/0x430 [ 60.605708][ T7036] ? __fget_files+0x294/0x400 [ 60.605720][ T7036] ? fb_open+0x430/0x430 [ 60.605730][ T7036] __do_compat_sys_ioctl+0x1d3/0x230 [ 60.605743][ T7036] do_syscall_32_irqs_on+0x3f/0x60 [ 60.605753][ T7036] do_fast_syscall_32+0x7f/0x120 [ 60.605765][ T7036] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 60.605773][ T7036] RIP: 0023:0xf7fe8569 [ 60.605783][ T7036] Code: 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 60.605788][ T7036] RSP: 002b:00000000f7fe30cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 [ 60.605797][ T7036] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000004601 [ 60.605802][ T7036] RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 60.605807][ T7036] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 60.605812][ T7036] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 60.605817][ T7036] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 60.605827][ T7036] [ 60.605832][ T7036] Allocated by task 7036: [ 60.605841][ T7036] save_stack+0x1b/0x40 [ 60.605848][ T7036] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 60.605856][ T7036] __kmalloc+0x17a/0x340 [ 60.605864][ T7036] bit_cursor+0x8a3/0x17d0 [ 60.605871][ T7036] fbcon_cursor+0x52b/0x650 [ 60.605879][ T7036] set_cursor+0x1dd/0x230 [ 60.605887][ T7036] redraw_screen+0x4b7/0x770 [ 60.605895][ T7036] vc_do_resize+0x1111/0x13f0 [ 60.605902][ T7036] fbcon_modechanged+0x36c/0x710 [ 60.605909][ T7036] fbcon_update_vcs+0x3a/0x50 [ 60.605917][ T7036] fb_set_var+0xae8/0xd60 [ 60.605924][ T7036] fbcon_resize+0x575/0x610 [ 60.605932][ T7036] vc_do_resize+0x53e/0x13f0 [ 60.605939][ T7036] fbcon_modechanged+0x36c/0x710 [ 60.605946][ T7036] fbcon_update_vcs+0x3a/0x50 [ 60.605954][ T7036] fb_set_var+0xae8/0xd60 [ 60.605962][ T7036] do_fb_ioctl+0x33f/0x6c0 [ 60.605970][ T7036] fb_compat_ioctl+0x175/0xc10 [ 60.605977][ T7036] __do_compat_sys_ioctl+0x1d3/0x230 [ 60.605985][ T7036] do_syscall_32_irqs_on+0x3f/0x60 [ 60.605993][ T7036] do_fast_syscall_32+0x7f/0x120 [ 60.606002][ T7036] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 60.606004][ T7036] [ 60.606008][ T7036] Freed by task 7036: [ 60.606016][ T7036] save_stack+0x1b/0x40 [ 60.606022][ T7036] __kasan_slab_free+0xf5/0x140 [ 60.606030][ T7036] kfree+0x103/0x2c0 [ 60.606037][ T7036] bit_cursor+0x8e7/0x17d0 [ 60.606044][ T7036] fbcon_cursor+0x52b/0x650 [ 60.606059][ T7036] set_cursor+0x1dd/0x230 [ 60.606072][ T7036] redraw_screen+0x4b7/0x770 [ 60.606084][ T7036] fbcon_modechanged+0x575/0x710 [ 60.606096][ T7036] fbcon_update_vcs+0x3a/0x50 [ 60.606106][ T7036] fb_set_var+0xae8/0xd60 [ 60.606113][ T7036] fbcon_resize+0x575/0x610 [ 60.606121][ T7036] vc_do_resize+0x53e/0x13f0 [ 60.606128][ T7036] fbcon_modechanged+0x36c/0x710 [ 60.606135][ T7036] fbcon_update_vcs+0x3a/0x50 [ 60.606143][ T7036] fb_set_var+0xae8/0xd60 [ 60.606150][ T7036] do_fb_ioctl+0x33f/0x6c0 [ 60.606158][ T7036] fb_compat_ioctl+0x175/0xc10 [ 60.606166][ T7036] __do_compat_sys_ioctl+0x1d3/0x230 [ 60.606174][ T7036] do_syscall_32_irqs_on+0x3f/0x60 [ 60.606182][ T7036] do_fast_syscall_32+0x7f/0x120 [ 60.606191][ T7036] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 60.606193][ T7036] [ 60.606199][ T7036] The buggy address belongs to the object at ffff88809f9aa5c0 [ 60.606199][ T7036] which belongs to the cache kmalloc-32 of size 32 [ 60.606207][ T7036] The buggy address is located 0 bytes to the right of [ 60.606207][ T7036] 32-byte region [ffff88809f9aa5c0, ffff88809f9aa5e0) [ 60.606210][ T7036] The buggy address belongs to the page: [ 60.606220][ T7036] page:ffffea00027e6a80 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809f9aafc1 [ 60.606226][ T7036] flags: 0xfffe0000000200(slab) [ 60.606238][ T7036] raw: 00fffe0000000200 ffffea0002864948 ffff8880aa001240 ffff8880aa0001c0 [ 60.606247][ T7036] raw: ffff88809f9aafc1 ffff88809f9aa000 000000010000003c 0000000000000000 [ 60.606251][ T7036] page dumped because: kasan: bad access detected [ 60.606253][ T7036] [ 60.606256][ T7036] Memory state around the buggy address: [ 60.606263][ T7036] ffff88809f9aa480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 60.606269][ T7036] ffff88809f9aa500: 00 04 fc fc fc fc fc fc 00 04 fc fc fc fc fc fc [ 60.606276][ T7036] >ffff88809f9aa580: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc [ 60.606279][ T7036] ^ [ 60.606286][ T7036] ffff88809f9aa600: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 60.606292][ T7036] ffff88809f9aa680: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 60.606295][ T7036] ================================================================== [ 60.606299][ T7036] Disabling lock debugging due to kernel taint [ 60.616107][ T7036] Kernel panic - not syncing: panic_on_warn set ... [ 60.616123][ T7036] CPU: 1 PID: 7036 Comm: syz-executor.0 Tainted: G B 5.8.0-rc7-syzkaller #0 [ 60.616130][ T7036] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.616133][ T7036] Call Trace: [ 60.616152][ T7036] dump_stack+0x18f/0x20d [ 60.616170][ T7036] ? vc_do_resize+0x970/0x13f0 [ 60.616184][ T7036] panic+0x2e3/0x75c [ 60.616199][ T7036] ? __warn_printk+0xf3/0xf3 [ 60.616216][ T7036] ? preempt_schedule_common+0x59/0xc0 [ 60.616231][ T7036] ? vc_do_resize+0x9d6/0x13f0 [ 60.616246][ T7036] ? preempt_schedule_thunk+0x16/0x18 [ 60.616261][ T7036] ? trace_hardirqs_on+0x55/0x220 [ 60.616277][ T7036] ? vc_do_resize+0x9d6/0x13f0 [ 60.616290][ T7036] ? vc_do_resize+0x9d6/0x13f0 [ 60.616303][ T7036] end_report+0x4d/0x53 [ 60.616315][ T7036] kasan_report.cold+0xd/0x37 [ 60.616331][ T7036] ? vc_do_resize+0x9d6/0x13f0 [ 60.616345][ T7036] check_memory_region+0x13d/0x180 [ 60.616356][ T7036] memcpy+0x20/0x60 [ 60.616371][ T7036] vc_do_resize+0x9d6/0x13f0 [ 60.616392][ T7036] ? store_bind+0x6a0/0x6a0 [ 60.616403][ T7036] ? memcpy+0x39/0x60 [ 60.616421][ T7036] fbcon_modechanged+0x36c/0x710 [ 60.616437][ T7036] fbcon_update_vcs+0x3a/0x50 [ 60.616452][ T7036] fb_set_var+0xae8/0xd60 [ 60.616466][ T7036] ? fb_blank+0x190/0x190 [ 60.616480][ T7036] ? lock_release+0x8d0/0x8d0 [ 60.616495][ T7036] ? lock_is_held_type+0xb0/0xe0 [ 60.616513][ T7036] ? do_fb_ioctl+0x2f2/0x6c0 [ 60.616532][ T7036] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 60.616546][ T7036] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.616557][ T7036] ? trace_hardirqs_on+0x5f/0x220 [ 60.616573][ T7036] do_fb_ioctl+0x33f/0x6c0 [ 60.616587][ T7036] ? fb_set_suspend+0x1a0/0x1a0 [ 60.616600][ T7036] ? lock_downgrade+0x820/0x820 [ 60.616619][ T7036] ? trace_hardirqs_on+0x5f/0x220 [ 60.616630][ T7036] ? lockdep_hardirqs_on+0x6a/0xe0 [ 60.616645][ T7036] ? tomoyo_path_number_perm+0x244/0x4d0 [ 60.616660][ T7036] ? tomoyo_execute_permission+0x470/0x470 [ 60.616672][ T7036] ? __might_fault+0xef/0x1d0 [ 60.616694][ T7036] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 60.616706][ T7036] ? do_vfs_ioctl+0x27d/0x1090 [ 60.616719][ T7036] ? generic_block_fiemap+0x60/0x60 [ 60.616733][ T7036] fb_compat_ioctl+0x175/0xc10 [ 60.616747][ T7036] ? fb_open+0x430/0x430 [ 60.616760][ T7036] ? __fget_files+0x294/0x400 [ 60.616775][ T7036] ? fb_open+0x430/0x430 [ 60.616789][ T7036] __do_compat_sys_ioctl+0x1d3/0x230 [ 60.616805][ T7036] do_syscall_32_irqs_on+0x3f/0x60 [ 60.616820][ T7036] do_fast_syscall_32+0x7f/0x120 [ 60.616837][ T7036] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 60.616847][ T7036] RIP: 0023:0xf7fe8569 [ 60.616862][ T7036] Code: 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 60.616868][ T7036] RSP: 002b:00000000f7fe30cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 [ 60.616880][ T7036] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000004601 [ 60.616888][ T7036] RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 60.616895][ T7036] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 60.616901][ T7036] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 60.616908][ T7036] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 60.618085][ T7036] Kernel Offset: disabled [ 61.640450][ T7036] Rebooting in 86400 seconds..