[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.61' (ECDSA) to the list of known hosts. 2020/09/03 22:07:45 parsed 1 programs 2020/09/03 22:07:45 executed programs: 0 syzkaller login: [ 40.456551] audit: type=1400 audit(1599170865.886:8): avc: denied { execmem } for pid=6464 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 41.606316] IPVS: ftp: loaded support on port[0] = 21 [ 41.715057] chnl_net:caif_netlink_parms(): no params data found [ 41.808476] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.815291] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.823590] device bridge_slave_0 entered promiscuous mode [ 41.831592] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.837970] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.846311] device bridge_slave_1 entered promiscuous mode [ 41.864342] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.873247] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.893029] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 41.900954] team0: Port device team_slave_0 added [ 41.906481] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 41.914055] team0: Port device team_slave_1 added [ 41.929691] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 41.935970] 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. [ 41.962022] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 41.973836] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 41.980158] 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. [ 42.006195] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 42.017134] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.025001] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.044507] device hsr_slave_0 entered promiscuous mode [ 42.050753] device hsr_slave_1 entered promiscuous mode [ 42.056854] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 42.065157] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 42.134155] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.140613] bridge0: port 2(bridge_slave_1) entered forwarding state [ 42.147419] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.153838] bridge0: port 1(bridge_slave_0) entered forwarding state [ 42.187352] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 42.194631] 8021q: adding VLAN 0 to HW filter on device bond0 [ 42.203825] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 42.214275] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 42.223834] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.231404] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.238366] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 42.249139] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 42.255705] 8021q: adding VLAN 0 to HW filter on device team0 [ 42.265276] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 42.273393] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.279814] bridge0: port 1(bridge_slave_0) entered forwarding state [ 42.289984] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 42.297608] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.304024] bridge0: port 2(bridge_slave_1) entered forwarding state [ 42.320673] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 42.328480] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 42.337364] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 42.348077] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 42.360034] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 42.368979] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 42.375091] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 42.388886] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 42.397444] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 42.406081] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 42.417243] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 42.430025] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 42.440003] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 42.471387] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 42.478422] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 42.486388] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 42.496823] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 42.505176] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 42.513390] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 42.523493] device veth0_vlan entered promiscuous mode [ 42.533584] device veth1_vlan entered promiscuous mode [ 42.539800] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 42.548715] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 42.561125] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 42.571826] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 42.579168] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 42.587452] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 42.601597] device veth0_macvtap entered promiscuous mode [ 42.607719] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 42.618650] device veth1_macvtap entered promiscuous mode [ 42.628429] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 42.638360] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 42.648931] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 42.656459] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 42.664897] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 42.675421] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 42.682719] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 42.806922] mmap: syz-executor.0 (6702) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst. [ 42.880431] ================================================================== [ 42.880468] BUG: KASAN: global-out-of-bounds in fbcon_resize+0x7b5/0x860 [ 42.880478] Read of size 4 at addr ffffffff87cd6258 by task syz-executor.0/6702 [ 42.880481] [ 42.880494] CPU: 0 PID: 6702 Comm: syz-executor.0 Not tainted 4.19.143-syzkaller #0 [ 42.880501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.880505] Call Trace: [ 42.880519] dump_stack+0x1fc/0x2fe [ 42.880532] print_address_description.cold+0x5/0x219 [ 42.880541] kasan_report_error.cold+0x8a/0x1c7 [ 42.880548] ? fbcon_resize+0x7b5/0x860 [ 42.880555] __asan_report_load4_noabort+0x88/0x90 [ 42.880563] ? fbcon_resize+0x7b5/0x860 [ 42.880571] fbcon_resize+0x7b5/0x860 [ 42.880579] ? get_color+0x20e/0x410 [ 42.880587] ? display_to_var+0x7b0/0x7b0 [ 42.880607] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 42.880615] ? __kmalloc+0x38e/0x3c0 [ 42.880622] ? vc_do_resize+0x2ff/0x1410 [ 42.880629] ? display_to_var+0x7b0/0x7b0 [ 42.880637] vc_do_resize+0x53e/0x1410 [ 42.880653] ? redraw_screen+0x870/0x870 [ 42.880662] ? lock_acquire+0x170/0x3c0 [ 42.880669] ? vt_ioctl+0xabe/0x2580 [ 42.880680] vt_ioctl+0xb23/0x2580 [ 42.880689] ? vt_waitactive+0x350/0x350 [ 42.880699] ? avc_has_extended_perms+0x86d/0xea0 [ 42.880709] ? futex_wake+0x159/0x480 [ 42.880718] ? avc_ss_reset+0x170/0x170 [ 42.880726] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 42.880735] ? tty_jobctrl_ioctl+0x4d/0xed0 [ 42.880742] ? vt_waitactive+0x350/0x350 [ 42.880750] tty_ioctl+0x5b0/0x15c0 [ 42.880757] ? tty_fasync+0x300/0x300 [ 42.880765] ? mark_held_locks+0xf0/0xf0 [ 42.880771] ? do_futex+0x163/0x1c40 [ 42.880779] ? mark_held_locks+0xf0/0xf0 [ 42.880788] ? mark_held_locks+0xf0/0xf0 [ 42.880796] ? debug_check_no_obj_freed+0x201/0x482 [ 42.880806] ? __might_fault+0x11f/0x1d0 [ 42.880814] ? tty_fasync+0x300/0x300 [ 42.880823] do_vfs_ioctl+0xcdb/0x12e0 [ 42.880831] ? selinux_file_ioctl+0x506/0x6c0 [ 42.880838] ? ioctl_preallocate+0x200/0x200 [ 42.880846] ? selinux_inode_link+0x20/0x20 [ 42.880855] ? __fget+0x356/0x510 [ 42.880864] ? do_dup2+0x450/0x450 [ 42.880877] ksys_ioctl+0x9b/0xc0 [ 42.880886] __x64_sys_ioctl+0x6f/0xb0 [ 42.880893] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 42.880901] do_syscall_64+0xf9/0x620 [ 42.880912] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.880925] RIP: 0033:0x45d5b9 [ 42.880933] 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 [ 42.880937] RSP: 002b:00007f654b199c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 42.880945] RAX: ffffffffffffffda RBX: 000000000001d000 RCX: 000000000045d5b9 [ 42.880949] RDX: 0000000020000000 RSI: 0000000000005609 RDI: 0000000000000006 [ 42.880953] RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 [ 42.880957] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c [ 42.880962] R13: 00007ffe310cd55f R14: 00007f654b19a9c0 R15: 000000000118cf4c [ 42.880971] [ 42.880973] The buggy address belongs to the variable: [ 42.880980] font_vga_8x16+0x58/0x60 [ 42.880982] [ 42.880984] Memory state around the buggy address: [ 42.880990] ffffffff87cd6100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.880996] ffffffff87cd6180: 00 00 00 00 fa fa fa fa 00 fa fa fa fa fa fa fa [ 42.881001] >ffffffff87cd6200: 00 00 00 00 00 fa fa fa fa fa fa fa 00 00 00 00 [ 42.881004] ^ [ 42.881009] ffffffff87cd6280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.881015] ffffffff87cd6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 42.881017] ================================================================== [ 42.881019] Disabling lock debugging due to kernel taint [ 42.881023] Kernel panic - not syncing: panic_on_warn set ... [ 42.881023] [ 42.881030] CPU: 0 PID: 6702 Comm: syz-executor.0 Tainted: G B 4.19.143-syzkaller #0 [ 42.881034] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.881036] Call Trace: [ 42.881042] dump_stack+0x1fc/0x2fe [ 42.881050] panic+0x26a/0x50e [ 42.881056] ? __warn_printk+0xf3/0xf3 [ 42.881064] ? lock_downgrade+0x720/0x720 [ 42.881071] ? print_shadow_for_address+0xb8/0x114 [ 42.881078] ? trace_hardirqs_on+0x55/0x210 [ 42.881086] kasan_end_report+0x43/0x49 [ 42.881092] kasan_report_error.cold+0xa7/0x1c7 [ 42.881099] ? fbcon_resize+0x7b5/0x860 [ 42.881105] __asan_report_load4_noabort+0x88/0x90 [ 42.881112] ? fbcon_resize+0x7b5/0x860 [ 42.881119] fbcon_resize+0x7b5/0x860 [ 42.881126] ? get_color+0x20e/0x410 [ 42.881133] ? display_to_var+0x7b0/0x7b0 [ 42.881145] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 42.881151] ? __kmalloc+0x38e/0x3c0 [ 42.881157] ? vc_do_resize+0x2ff/0x1410 [ 42.881163] ? display_to_var+0x7b0/0x7b0 [ 42.881170] vc_do_resize+0x53e/0x1410 [ 42.881180] ? redraw_screen+0x870/0x870 [ 42.881187] ? lock_acquire+0x170/0x3c0 [ 42.881193] ? vt_ioctl+0xabe/0x2580 [ 42.881201] vt_ioctl+0xb23/0x2580 [ 42.881208] ? vt_waitactive+0x350/0x350 [ 42.881216] ? avc_has_extended_perms+0x86d/0xea0 [ 42.881222] ? futex_wake+0x159/0x480 [ 42.881230] ? avc_ss_reset+0x170/0x170 [ 42.881236] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 42.881243] ? tty_jobctrl_ioctl+0x4d/0xed0 [ 42.881250] ? vt_waitactive+0x350/0x350 [ 42.881256] tty_ioctl+0x5b0/0x15c0 [ 42.881262] ? tty_fasync+0x300/0x300 [ 42.881269] ? mark_held_locks+0xf0/0xf0 [ 42.881275] ? do_futex+0x163/0x1c40 [ 42.881282] ? mark_held_locks+0xf0/0xf0 [ 42.881289] ? mark_held_locks+0xf0/0xf0 [ 42.881296] ? debug_check_no_obj_freed+0x201/0x482 [ 42.881303] ? __might_fault+0x11f/0x1d0 [ 42.881310] ? tty_fasync+0x300/0x300 [ 42.881317] do_vfs_ioctl+0xcdb/0x12e0 [ 42.881324] ? selinux_file_ioctl+0x506/0x6c0 [ 42.881331] ? ioctl_preallocate+0x200/0x200 [ 42.881338] ? selinux_inode_link+0x20/0x20 [ 42.881345] ? __fget+0x356/0x510 [ 42.881352] ? do_dup2+0x450/0x450 [ 42.881361] ksys_ioctl+0x9b/0xc0 [ 42.881374] __x64_sys_ioctl+0x6f/0xb0 [ 42.881381] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 42.881387] do_syscall_64+0xf9/0x620 [ 42.881395] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.881400] RIP: 0033:0x45d5b9 [ 42.881406] 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 [ 42.881409] RSP: 002b:00007f654b199c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 42.881415] RAX: ffffffffffffffda RBX: 000000000001d000 RCX: 000000000045d5b9 [ 42.881419] RDX: 0000000020000000 RSI: 0000000000005609 RDI: 0000000000000006 [ 42.881423] RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 [ 42.881426] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c [ 42.881430] R13: 00007ffe310cd55f R14: 00007f654b19a9c0 R15: 000000000118cf4c [ 42.882722] Kernel Offset: disabled [ 43.550985] Rebooting in 86400 seconds..