[ OK ] Reached target Basic System. Starting OpenBSD Secure Shell server... [ OK ] Started Regular background program processing daemon. Starting Permit User Sessions... Starting System Logging Service... Starting getty on tty2-tty6 if dbus and logind are not available... [ OK ] Started Permit User Sessions. [ OK ] Started System Logging Service. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. 2020/04/11 11:47:37 parsed 1 programs syzkaller login: [ 73.673564][ T7041] as (7041) used greatest stack depth: 23088 bytes left 2020/04/11 11:47:40 executed programs: 0 [ 74.599576][ T27] audit: type=1400 audit(1586605660.268:8): avc: denied { execmem } for pid=7051 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 74.649932][ T7052] IPVS: ftp: loaded support on port[0] = 21 [ 74.753512][ T7052] chnl_net:caif_netlink_parms(): no params data found [ 74.809385][ T7052] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.818118][ T7052] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.827617][ T7052] device bridge_slave_0 entered promiscuous mode [ 74.836688][ T7052] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.845029][ T7052] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.853429][ T7052] device bridge_slave_1 entered promiscuous mode [ 74.874642][ T7052] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 74.886426][ T7052] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 74.909608][ T7052] team0: Port device team_slave_0 added [ 74.918082][ T7052] team0: Port device team_slave_1 added [ 74.937330][ T7052] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 74.944394][ T7052] 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. [ 74.971817][ T7052] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 74.984575][ T7052] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 74.991760][ T7052] 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. [ 75.017829][ T7052] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 75.093373][ T7052] device hsr_slave_0 entered promiscuous mode [ 75.130818][ T7052] device hsr_slave_1 entered promiscuous mode [ 75.280881][ T7052] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 75.304296][ T7052] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 75.354138][ T7052] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 75.412747][ T7052] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 75.468561][ T7052] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.475765][ T7052] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.483593][ T7052] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.490736][ T7052] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.539846][ T7052] 8021q: adding VLAN 0 to HW filter on device bond0 [ 75.556419][ T3398] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 75.568795][ T3398] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.577296][ T3398] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.585948][ T3398] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 75.599725][ T7052] 8021q: adding VLAN 0 to HW filter on device team0 [ 75.612070][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 75.620657][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.627731][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.639292][ T3398] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 75.648919][ T3398] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.656037][ T3398] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.691858][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 75.702352][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 75.712092][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 75.720245][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 75.730035][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 75.751283][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 75.758726][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 75.773352][ T7052] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 75.794627][ T3395] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 75.804926][ T3395] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 75.829894][ T7052] device veth0_vlan entered promiscuous mode [ 75.836854][ T3398] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 75.846382][ T3398] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 75.856132][ T3395] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 75.864806][ T3395] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 75.878062][ T7052] device veth1_vlan entered promiscuous mode [ 75.903938][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 75.912427][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 75.920352][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 75.929136][ T7260] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 75.939937][ T7052] device veth0_macvtap entered promiscuous mode [ 75.950782][ T7052] device veth1_macvtap entered promiscuous mode [ 75.969300][ T7052] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 75.977242][ T3395] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 75.986252][ T3395] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 75.994867][ T3395] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 76.003675][ T3395] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 76.015474][ T7052] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 76.023716][ T3398] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 76.032946][ T3398] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 76.261903][ T7262] ================================================================== [ 76.261983][ T7262] BUG: KASAN: global-out-of-bounds in fb_pad_aligned_buffer+0x137/0x150 [ 76.261995][ T7262] Read of size 1 at addr ffffffff88752780 by task syz-executor.0/7262 [ 76.261999][ T7262] [ 76.262014][ T7262] CPU: 0 PID: 7262 Comm: syz-executor.0 Not tainted 5.6.0-syzkaller #0 [ 76.262021][ T7262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.262027][ T7262] Call Trace: [ 76.262058][ T7262] dump_stack+0x188/0x20d [ 76.262089][ T7262] print_address_description.constprop.0.cold+0x5/0x315 [ 76.262104][ T7262] ? fb_pad_aligned_buffer+0x137/0x150 [ 76.262117][ T7262] __kasan_report.cold+0x35/0x4d [ 76.262148][ T7262] ? fb_pad_aligned_buffer+0x137/0x150 [ 76.262163][ T7262] ? fb_pad_aligned_buffer+0x137/0x150 [ 76.262174][ T7262] kasan_report+0x33/0x50 [ 76.262191][ T7262] fb_pad_aligned_buffer+0x137/0x150 [ 76.262212][ T7262] bit_putcs+0xc21/0xe10 [ 76.262237][ T7262] ? print_usage_bug+0x16f/0x240 [ 76.262260][ T7262] ? bit_cursor+0x1900/0x1900 [ 76.262274][ T7262] ? lockdep_hardirqs_on+0x463/0x620 [ 76.262292][ T7262] ? fb_get_color_depth.part.0+0xc6/0x1f0 [ 76.262312][ T7262] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 76.262332][ T7262] fbcon_putcs+0x345/0x3f0 [ 76.262346][ T7262] ? bit_cursor+0x1900/0x1900 [ 76.262366][ T7262] do_update_region+0x398/0x630 [ 76.262388][ T7262] ? con_get_trans_old+0x280/0x280 [ 76.262408][ T7262] ? fbcon_set_palette+0x3b1/0x4a0 [ 76.262422][ T7262] ? var_to_display+0x7f0/0x7f0 [ 76.262441][ T7262] redraw_screen+0x64c/0x770 [ 76.262453][ T7262] ? lock_acquire+0x1f2/0x8f0 [ 76.262469][ T7262] ? respond_string+0x290/0x290 [ 76.262503][ T7262] fbcon_do_set_font+0x815/0x950 [ 76.262526][ T7262] fbcon_copy_font+0x125/0x190 [ 76.262540][ T7262] ? fbcon_do_set_font+0x950/0x950 [ 76.262555][ T7262] con_font_op+0x666/0x1160 [ 76.262572][ T7262] ? lock_downgrade+0x840/0x840 [ 76.262585][ T7262] ? con_write+0xe0/0xe0 [ 76.262610][ T7262] ? __might_fault+0x190/0x1d0 [ 76.262630][ T7262] vt_ioctl+0x1793/0x26b0 [ 76.262644][ T7262] ? tomoyo_compare_number_union+0x80/0x100 [ 76.262658][ T7262] ? lockdep_hardirqs_on+0x463/0x620 [ 76.262688][ T7262] ? complete_change_console+0x3a0/0x3a0 [ 76.262703][ T7262] ? tomoyo_path_number_perm+0x238/0x4d0 [ 76.262718][ T7262] ? tomoyo_execute_permission+0x470/0x470 [ 76.262740][ T7262] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 76.262755][ T7262] ? complete_change_console+0x3a0/0x3a0 [ 76.262771][ T7262] tty_ioctl+0xedc/0x1440 [ 76.262785][ T7262] ? tty_vhangup+0x30/0x30 [ 76.262815][ T7262] ? do_vfs_ioctl+0x50c/0x12d0 [ 76.262831][ T7262] ? ioctl_file_clone+0x180/0x180 [ 76.262860][ T7262] ? selinux_file_mprotect+0x610/0x610 [ 76.262890][ T7262] ? __fget_files+0x32f/0x500 [ 76.262910][ T7262] ? ksys_dup3+0x3c0/0x3c0 [ 76.262926][ T7262] ? __x64_sys_futex+0x380/0x4f0 [ 76.262948][ T7262] ? tty_vhangup+0x30/0x30 [ 76.262962][ T7262] ksys_ioctl+0x11a/0x180 [ 76.262980][ T7262] __x64_sys_ioctl+0x6f/0xb0 [ 76.262992][ T7262] ? lockdep_hardirqs_on+0x463/0x620 [ 76.263009][ T7262] do_syscall_64+0xf6/0x7d0 [ 76.263027][ T7262] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 76.263039][ T7262] RIP: 0033:0x45c889 [ 76.263053][ T7262] Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 76.263061][ T7262] RSP: 002b:00007f9074f91c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 76.263074][ T7262] RAX: ffffffffffffffda RBX: 00007f9074f926d4 RCX: 000000000045c889 [ 76.263092][ T7262] RDX: 0000000020000080 RSI: 0000000000004b72 RDI: 0000000000000003 [ 76.263101][ T7262] RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 [ 76.263109][ T7262] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 76.263117][ T7262] R13: 000000000000036c R14: 00000000004c5e17 R15: 000000000076bf0c [ 76.263138][ T7262] [ 76.263143][ T7262] The buggy address belongs to the variable: [ 76.263157][ T7262] fontdata_8x16+0x1000/0x1120 [ 76.263161][ T7262] [ 76.263166][ T7262] Memory state around the buggy address: [ 76.263178][ T7262] ffffffff88752680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 76.263203][ T7262] ffffffff88752700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 76.263213][ T7262] >ffffffff88752780: fa fa fa fa 06 fa fa fa fa fa fa fa 05 fa fa fa [ 76.263219][ T7262] ^ [ 76.263228][ T7262] ffffffff88752800: fa fa fa fa 06 fa fa fa fa fa fa fa 00 00 03 fa [ 76.263238][ T7262] ffffffff88752880: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00 [ 76.263243][ T7262] ================================================================== [ 76.263248][ T7262] Disabling lock debugging due to kernel taint [ 76.263311][ T7262] Kernel panic - not syncing: panic_on_warn set ... [ 76.263325][ T7262] CPU: 0 PID: 7262 Comm: syz-executor.0 Tainted: G B 5.6.0-syzkaller #0 [ 76.263331][ T7262] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.263335][ T7262] Call Trace: [ 76.263364][ T7262] dump_stack+0x188/0x20d [ 76.263379][ T7262] panic+0x2e3/0x75c [ 76.263392][ T7262] ? add_taint.cold+0x16/0x16 [ 76.263407][ T7262] ? preempt_schedule_common+0x5e/0xc0 [ 76.263419][ T7262] ? fb_pad_aligned_buffer+0x137/0x150 [ 76.263432][ T7262] ? preempt_schedule_thunk+0x16/0x18 [ 76.263445][ T7262] ? trace_hardirqs_on+0x55/0x220 [ 76.263458][ T7262] ? fb_pad_aligned_buffer+0x137/0x150 [ 76.263469][ T7262] end_report+0x4d/0x53 [ 76.263481][ T7262] __kasan_report.cold+0xd/0x4d [ 76.263494][ T7262] ? fb_pad_aligned_buffer+0x137/0x150 [ 76.263507][ T7262] ? fb_pad_aligned_buffer+0x137/0x150 [ 76.263517][ T7262] kasan_report+0x33/0x50 [ 76.263530][ T7262] fb_pad_aligned_buffer+0x137/0x150 [ 76.263544][ T7262] bit_putcs+0xc21/0xe10 [ 76.263560][ T7262] ? print_usage_bug+0x16f/0x240 [ 76.263575][ T7262] ? bit_cursor+0x1900/0x1900 [ 76.263586][ T7262] ? lockdep_hardirqs_on+0x463/0x620 [ 76.263600][ T7262] ? fb_get_color_depth.part.0+0xc6/0x1f0 [ 76.263615][ T7262] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 76.263628][ T7262] fbcon_putcs+0x345/0x3f0 [ 76.263639][ T7262] ? bit_cursor+0x1900/0x1900 [ 76.263652][ T7262] do_update_region+0x398/0x630 [ 76.263666][ T7262] ? con_get_trans_old+0x280/0x280 [ 76.263682][ T7262] ? fbcon_set_palette+0x3b1/0x4a0 [ 76.263693][ T7262] ? var_to_display+0x7f0/0x7f0 [ 76.263706][ T7262] redraw_screen+0x64c/0x770 [ 76.263717][ T7262] ? lock_acquire+0x1f2/0x8f0 [ 76.263728][ T7262] ? respond_string+0x290/0x290 [ 76.263746][ T7262] fbcon_do_set_font+0x815/0x950 [ 76.263761][ T7262] fbcon_copy_font+0x125/0x190 [ 76.263775][ T7262] ? fbcon_do_set_font+0x950/0x950 [ 76.263786][ T7262] con_font_op+0x666/0x1160 [ 76.263799][ T7262] ? lock_downgrade+0x840/0x840 [ 76.263811][ T7262] ? con_write+0xe0/0xe0 [ 76.263826][ T7262] ? __might_fault+0x190/0x1d0 [ 76.263840][ T7262] vt_ioctl+0x1793/0x26b0 [ 76.263851][ T7262] ? tomoyo_compare_number_union+0x80/0x100 [ 76.263862][ T7262] ? lockdep_hardirqs_on+0x463/0x620 [ 76.263874][ T7262] ? complete_change_console+0x3a0/0x3a0 [ 76.263887][ T7262] ? tomoyo_path_number_perm+0x238/0x4d0 [ 76.263900][ T7262] ? tomoyo_execute_permission+0x470/0x470 [ 76.263917][ T7262] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 76.263930][ T7262] ? complete_change_console+0x3a0/0x3a0 [ 76.263942][ T7262] tty_ioctl+0xedc/0x1440 [ 76.263955][ T7262] ? tty_vhangup+0x30/0x30 [ 76.263967][ T7262] ? do_vfs_ioctl+0x50c/0x12d0 [ 76.263980][ T7262] ? ioctl_file_clone+0x180/0x180 [ 76.263992][ T7262] ? selinux_file_mprotect+0x610/0x610 [ 76.264004][ T7262] ? __fget_files+0x32f/0x500 [ 76.264018][ T7262] ? ksys_dup3+0x3c0/0x3c0 [ 76.264030][ T7262] ? __x64_sys_futex+0x380/0x4f0 [ 76.264045][ T7262] ? tty_vhangup+0x30/0x30 [ 76.264057][ T7262] ksys_ioctl+0x11a/0x180 [ 76.264070][ T7262] __x64_sys_ioctl+0x6f/0xb0 [ 76.264092][ T7262] ? lockdep_hardirqs_on+0x463/0x620 [ 76.264107][ T7262] do_syscall_64+0xf6/0x7d0 [ 76.264121][ T7262] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 76.264130][ T7262] RIP: 0033:0x45c889 [ 76.264141][ T7262] Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 76.264148][ T7262] RSP: 002b:00007f9074f91c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 76.264159][ T7262] RAX: ffffffffffffffda RBX: 00007f9074f926d4 RCX: 000000000045c889 [ 76.264166][ T7262] RDX: 0000000020000080 RSI: 0000000000004b72 RDI: 0000000000000003 [ 76.264173][ T7262] RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 [ 76.264179][ T7262] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 76.264185][ T7262] R13: 000000000000036c R14: 00000000004c5e17 R15: 000000000076bf0c [ 76.265314][ T7262] Kernel Offset: disabled [ 77.114612][ T7262] Rebooting in 86400 seconds..