[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.13' (ECDSA) to the list of known hosts. 2020/09/07 20:36:50 parsed 1 programs 2020/09/07 20:36:51 executed programs: 0 syzkaller login: [ 62.482669][ T6866] IPVS: ftp: loaded support on port[0] = 21 [ 62.674378][ T6866] chnl_net:caif_netlink_parms(): no params data found [ 62.727577][ T6866] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.735748][ T6866] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.744808][ T6866] device bridge_slave_0 entered promiscuous mode [ 62.754306][ T6866] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.761961][ T6866] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.770686][ T6866] device bridge_slave_1 entered promiscuous mode [ 62.791817][ T6866] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 62.802719][ T6866] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 62.826314][ T6866] team0: Port device team_slave_0 added [ 62.834167][ T6866] team0: Port device team_slave_1 added [ 62.853747][ T6866] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 62.861314][ T6866] 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. [ 62.888864][ T6866] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 62.902528][ T6866] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 62.912701][ T6866] 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. [ 62.939286][ T6866] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 62.967357][ T6866] device hsr_slave_0 entered promiscuous mode [ 62.974714][ T6866] device hsr_slave_1 entered promiscuous mode [ 63.077379][ T6866] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 63.087421][ T6866] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 63.097900][ T6866] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 63.108922][ T6866] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 63.134471][ T6866] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.141818][ T6866] bridge0: port 2(bridge_slave_1) entered forwarding state [ 63.149575][ T6866] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.156663][ T6866] bridge0: port 1(bridge_slave_0) entered forwarding state [ 63.205975][ T6866] 8021q: adding VLAN 0 to HW filter on device bond0 [ 63.221862][ T2584] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 63.232977][ T2584] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.241450][ T2584] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.249243][ T2584] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 63.263390][ T6866] 8021q: adding VLAN 0 to HW filter on device team0 [ 63.274887][ T2584] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 63.284181][ T2584] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.291313][ T2584] bridge0: port 1(bridge_slave_0) entered forwarding state [ 63.311230][ T2625] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 63.320622][ T2625] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.327698][ T2625] bridge0: port 2(bridge_slave_1) entered forwarding state [ 63.350692][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 63.359187][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 63.368445][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 63.376879][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 63.386226][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 63.395890][ T6866] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 63.416120][ T2625] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 63.424418][ T2625] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 63.437913][ T6866] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 63.458298][ T2625] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 63.480038][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 63.488207][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 63.497140][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 63.505490][ T6866] device veth0_vlan entered promiscuous mode [ 63.519271][ T6866] device veth1_vlan entered promiscuous mode [ 63.542564][ T2625] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 63.551085][ T2625] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 63.559645][ T2625] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 63.570374][ T6866] device veth0_macvtap entered promiscuous mode [ 63.580143][ T6866] device veth1_macvtap entered promiscuous mode [ 63.598487][ T6866] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 63.605890][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 63.616342][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 63.630129][ T6866] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 63.637800][ T2625] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 63.651110][ T6866] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 63.660518][ T6866] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 63.669188][ T6866] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 63.679695][ T6866] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 63.763948][ T7088] mmap: syz-executor.0 (7088) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst. [ 63.851784][ T7088] ================================================================== [ 63.851827][ T7088] BUG: KASAN: global-out-of-bounds in fbcon_resize+0x781/0x810 [ 63.851835][ T7088] Read of size 4 at addr ffffffff8896c2d8 by task syz-executor.0/7088 [ 63.851838][ T7088] [ 63.851855][ T7088] CPU: 1 PID: 7088 Comm: syz-executor.0 Not tainted 5.9.0-rc4-syzkaller #0 [ 63.851861][ T7088] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.851864][ T7088] Call Trace: [ 63.851876][ T7088] dump_stack+0x198/0x1fd [ 63.851886][ T7088] ? fbcon_resize+0x781/0x810 [ 63.851893][ T7088] ? fbcon_resize+0x781/0x810 [ 63.851906][ T7088] print_address_description.constprop.0.cold+0x5/0x497 [ 63.851915][ T7088] ? fbcon_resize+0x781/0x810 [ 63.851926][ T7088] ? lockdep_hardirqs_off+0x96/0xd0 [ 63.851937][ T7088] ? vprintk_func+0x97/0x1a6 [ 63.851946][ T7088] ? fbcon_resize+0x781/0x810 [ 63.851954][ T7088] ? fbcon_resize+0x781/0x810 [ 63.851962][ T7088] kasan_report.cold+0x1f/0x37 [ 63.851972][ T7088] ? fbcon_resize+0x781/0x810 [ 63.851982][ T7088] fbcon_resize+0x781/0x810 [ 63.851993][ T7088] ? display_to_var+0x7b0/0x7b0 [ 63.852020][ T7088] ? vc_do_resize+0x2f6/0x1150 [ 63.852033][ T7088] ? __kmalloc+0x1c7/0x310 [ 63.852051][ T7088] ? display_to_var+0x7b0/0x7b0 [ 63.852068][ T7088] vc_do_resize+0x535/0x1150 [ 63.852102][ T7088] ? lock_downgrade+0x830/0x830 [ 63.852116][ T7088] ? check_preemption_disabled+0x50/0x130 [ 63.852126][ T7088] ? store_bind+0x6a0/0x6a0 [ 63.852136][ T7088] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 63.852145][ T7088] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 63.852158][ T7088] vt_ioctl+0x11d2/0x2cc0 [ 63.852167][ T7088] ? lock_release+0x1/0x8f0 [ 63.852176][ T7088] ? vt_waitactive+0x350/0x350 [ 63.852184][ T7088] ? check_preemption_disabled+0x50/0x130 [ 63.852191][ T7088] ? kfree+0x221/0x2b0 [ 63.852202][ T7088] ? tomoyo_path_number_perm+0x415/0x4d0 [ 63.852210][ T7088] ? lockdep_hardirqs_on+0x53/0x100 [ 63.852222][ T7088] ? tomoyo_path_number_perm+0x244/0x4d0 [ 63.852233][ T7088] ? tomoyo_execute_permission+0x470/0x470 [ 63.852244][ T7088] ? lock_is_held_type+0xbb/0xf0 [ 63.852254][ T7088] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 63.852265][ T7088] ? tty_jobctrl_ioctl+0x4d/0x1010 [ 63.852273][ T7088] ? vt_waitactive+0x350/0x350 [ 63.852284][ T7088] tty_ioctl+0x1019/0x15f0 [ 63.852295][ T7088] ? tty_fasync+0x390/0x390 [ 63.852304][ T7088] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 63.852315][ T7088] ? do_vfs_ioctl+0x27d/0x1090 [ 63.852325][ T7088] ? generic_block_fiemap+0x60/0x60 [ 63.852334][ T7088] ? _copy_to_user+0x126/0x160 [ 63.852350][ T7088] ? __fget_files+0x294/0x400 [ 63.852363][ T7088] ? bpf_lsm_file_ioctl+0x5/0x10 [ 63.852372][ T7088] ? tty_fasync+0x390/0x390 [ 63.852382][ T7088] __x64_sys_ioctl+0x193/0x200 [ 63.852393][ T7088] do_syscall_64+0x2d/0x70 [ 63.852402][ T7088] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.852410][ T7088] RIP: 0033:0x45d5b9 [ 63.852420][ T7088] Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 63.852425][ T7088] RSP: 002b:00007f1d6b27fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 63.852434][ T7088] RAX: ffffffffffffffda RBX: 000000000001d000 RCX: 000000000045d5b9 [ 63.852440][ T7088] RDX: 0000000020000000 RSI: 0000000000005609 RDI: 0000000000000006 [ 63.852445][ T7088] RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 [ 63.852451][ T7088] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c [ 63.852456][ T7088] R13: 00007ffc87330c2f R14: 00007f1d6b2809c0 R15: 000000000118cf4c [ 63.852468][ T7088] [ 63.852472][ T7088] The buggy address belongs to the variable: [ 63.852480][ T7088] font_vga_8x16+0x58/0x60 [ 63.852482][ T7088] [ 63.852485][ T7088] Memory state around the buggy address: [ 63.852493][ T7088] ffffffff8896c180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 63.852500][ T7088] ffffffff8896c200: 00 00 00 00 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 [ 63.852507][ T7088] >ffffffff8896c280: 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 [ 63.852511][ T7088] ^ [ 63.852518][ T7088] ffffffff8896c300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 63.852524][ T7088] ffffffff8896c380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 63.852528][ T7088] ================================================================== [ 63.852530][ T7088] Disabling lock debugging due to kernel taint [ 63.852535][ T7088] Kernel panic - not syncing: panic_on_warn set ... [ 63.852544][ T7088] CPU: 1 PID: 7088 Comm: syz-executor.0 Tainted: G B 5.9.0-rc4-syzkaller #0 [ 63.852548][ T7088] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.852550][ T7088] Call Trace: [ 63.852558][ T7088] dump_stack+0x198/0x1fd [ 63.852566][ T7088] ? fbcon_resize+0x720/0x810 [ 63.852574][ T7088] panic+0x347/0x7c0 [ 63.852582][ T7088] ? __warn_printk+0xf3/0xf3 [ 63.852592][ T7088] ? trace_hardirqs_on+0x55/0x220 [ 63.852600][ T7088] ? fbcon_resize+0x781/0x810 [ 63.852606][ T7088] ? fbcon_resize+0x781/0x810 [ 63.852613][ T7088] end_report+0x4d/0x53 [ 63.852620][ T7088] kasan_report.cold+0xd/0x37 [ 63.852628][ T7088] ? fbcon_resize+0x781/0x810 [ 63.852635][ T7088] fbcon_resize+0x781/0x810 [ 63.852644][ T7088] ? display_to_var+0x7b0/0x7b0 [ 63.852654][ T7088] ? vc_do_resize+0x2f6/0x1150 [ 63.852660][ T7088] ? __kmalloc+0x1c7/0x310 [ 63.852667][ T7088] ? display_to_var+0x7b0/0x7b0 [ 63.852674][ T7088] vc_do_resize+0x535/0x1150 [ 63.852685][ T7088] ? lock_downgrade+0x830/0x830 [ 63.852692][ T7088] ? check_preemption_disabled+0x50/0x130 [ 63.852698][ T7088] ? store_bind+0x6a0/0x6a0 [ 63.852705][ T7088] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 63.852713][ T7088] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 63.852721][ T7088] vt_ioctl+0x11d2/0x2cc0 [ 63.852728][ T7088] ? lock_release+0x1/0x8f0 [ 63.852735][ T7088] ? vt_waitactive+0x350/0x350 [ 63.852742][ T7088] ? check_preemption_disabled+0x50/0x130 [ 63.852748][ T7088] ? kfree+0x221/0x2b0 [ 63.852756][ T7088] ? tomoyo_path_number_perm+0x415/0x4d0 [ 63.852764][ T7088] ? lockdep_hardirqs_on+0x53/0x100 [ 63.852773][ T7088] ? tomoyo_path_number_perm+0x244/0x4d0 [ 63.852781][ T7088] ? tomoyo_execute_permission+0x470/0x470 [ 63.852790][ T7088] ? lock_is_held_type+0xbb/0xf0 [ 63.852797][ T7088] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 63.852805][ T7088] ? tty_jobctrl_ioctl+0x4d/0x1010 [ 63.852811][ T7088] ? vt_waitactive+0x350/0x350 [ 63.852820][ T7088] tty_ioctl+0x1019/0x15f0 [ 63.852828][ T7088] ? tty_fasync+0x390/0x390 [ 63.852835][ T7088] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 63.852843][ T7088] ? do_vfs_ioctl+0x27d/0x1090 [ 63.852858][ T7088] ? generic_block_fiemap+0x60/0x60 [ 63.852866][ T7088] ? _copy_to_user+0x126/0x160 [ 63.852875][ T7088] ? __fget_files+0x294/0x400 [ 63.852883][ T7088] ? bpf_lsm_file_ioctl+0x5/0x10 [ 63.852891][ T7088] ? tty_fasync+0x390/0x390 [ 63.852899][ T7088] __x64_sys_ioctl+0x193/0x200 [ 63.852907][ T7088] do_syscall_64+0x2d/0x70 [ 63.852914][ T7088] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.852919][ T7088] RIP: 0033:0x45d5b9 [ 63.852927][ T7088] Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 63.852931][ T7088] RSP: 002b:00007f1d6b27fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 63.852938][ T7088] RAX: ffffffffffffffda RBX: 000000000001d000 RCX: 000000000045d5b9 [ 63.852942][ T7088] RDX: 0000000020000000 RSI: 0000000000005609 RDI: 0000000000000006 [ 63.852947][ T7088] RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 [ 63.852952][ T7088] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c [ 63.852956][ T7088] R13: 00007ffc87330c2f R14: 00007f1d6b2809c0 R15: 000000000118cf4c [ 63.853899][ T7088] Kernel Offset: disabled [ 64.617629][ T7088] Rebooting in 86400 seconds..