[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.661815][ T27] audit: type=1800 audit(1576507852.621:25): pid=8899 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.682130][ T27] audit: type=1800 audit(1576507852.631:26): pid=8899 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.742249][ T27] audit: type=1800 audit(1576507852.631:27): pid=8899 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.216' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.456257][ T9059] ================================================================== [ 73.456299][ T9059] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 73.456307][ T9059] Read of size 2 at addr ffffffff8875111e by task syz-executor974/9059 [ 73.456309][ T9059] [ 73.456319][ T9059] CPU: 0 PID: 9059 Comm: syz-executor974 Not tainted 5.5.0-rc1-syzkaller #0 [ 73.456324][ T9059] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.456327][ T9059] Call Trace: [ 73.456339][ T9059] dump_stack+0x197/0x210 [ 73.456347][ T9059] ? vga16fb_imageblit+0x1c8b/0x2200 [ 73.456359][ T9059] print_address_description.constprop.0.cold+0x5/0x30b [ 73.456366][ T9059] ? vga16fb_imageblit+0x1c8b/0x2200 [ 73.456373][ T9059] ? vga16fb_imageblit+0x1c8b/0x2200 [ 73.456381][ T9059] __kasan_report.cold+0x1b/0x41 [ 73.456389][ T9059] ? vga16fb_imageblit+0x1c8b/0x2200 [ 73.456398][ T9059] kasan_report+0x12/0x20 [ 73.456407][ T9059] __asan_report_load2_noabort+0x14/0x20 [ 73.456414][ T9059] vga16fb_imageblit+0x1c8b/0x2200 [ 73.456423][ T9059] ? mark_lock+0xdf/0x1220 [ 73.456437][ T9059] soft_cursor+0x4fb/0xa30 [ 73.456444][ T9059] ? lockdep_hardirqs_on+0x421/0x5e0 [ 73.456457][ T9059] bit_cursor+0x12fc/0x1a60 [ 73.456469][ T9059] ? bit_clear+0x530/0x530 [ 73.456477][ T9059] ? fbcon_putcs+0x33c/0x3e0 [ 73.456485][ T9059] ? fbcon_putcs+0x343/0x3e0 [ 73.456499][ T9059] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 73.456508][ T9059] ? get_color+0x225/0x430 [ 73.456517][ T9059] fbcon_cursor+0x487/0x660 [ 73.456523][ T9059] ? bit_clear+0x530/0x530 [ 73.456535][ T9059] set_cursor+0x1fb/0x280 [ 73.456544][ T9059] redraw_screen+0x4e1/0x7d0 [ 73.456550][ T9059] ? efifb_probe.cold+0x181f/0x181f [ 73.456559][ T9059] ? respond_string+0x2c0/0x2c0 [ 73.456569][ T9059] ? fbcon_set_palette+0x3c4/0x4a0 [ 73.456580][ T9059] fbcon_modechanged+0x5c3/0x790 [ 73.456592][ T9059] fbcon_update_vcs+0x42/0x50 [ 73.456600][ T9059] fb_set_var+0xb32/0xdd0 [ 73.456608][ T9059] ? fb_blank+0x1a0/0x1a0 [ 73.456616][ T9059] ? lock_acquire+0x190/0x410 [ 73.456629][ T9059] ? __mutex_lock+0x458/0x13c0 [ 73.456636][ T9059] ? down+0x50/0x90 [ 73.456656][ T9059] ? do_fb_ioctl+0x335/0x7d0 [ 73.456668][ T9059] do_fb_ioctl+0x390/0x7d0 [ 73.456676][ T9059] ? fb_mmap+0x520/0x520 [ 73.456685][ T9059] ? tomoyo_path_number_perm+0x214/0x520 [ 73.456692][ T9059] ? find_held_lock+0x35/0x130 [ 73.456700][ T9059] ? tomoyo_path_number_perm+0x214/0x520 [ 73.456711][ T9059] ? lock_downgrade+0x920/0x920 [ 73.456718][ T9059] ? lockdep_hardirqs_on+0x421/0x5e0 [ 73.456728][ T9059] ? tomoyo_path_number_perm+0x454/0x520 [ 73.456751][ T9059] fb_ioctl+0xe6/0x130 [ 73.456758][ T9059] ? do_fb_ioctl+0x7d0/0x7d0 [ 73.456767][ T9059] do_vfs_ioctl+0x977/0x14e0 [ 73.456777][ T9059] ? compat_ioctl_preallocate+0x220/0x220 [ 73.456786][ T9059] ? kmem_cache_free+0x26b/0x320 [ 73.456796][ T9059] ? putname+0xf4/0x130 [ 73.456805][ T9059] ? do_sys_open+0x31d/0x5d0 [ 73.456816][ T9059] ? tomoyo_file_ioctl+0x23/0x30 [ 73.456824][ T9059] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.456832][ T9059] ? security_file_ioctl+0x8d/0xc0 [ 73.456841][ T9059] ksys_ioctl+0xab/0xd0 [ 73.456850][ T9059] __x64_sys_ioctl+0x73/0xb0 [ 73.456861][ T9059] do_syscall_64+0xfa/0x790 [ 73.456871][ T9059] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.456879][ T9059] RIP: 0033:0x440309 [ 73.456889][ T9059] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 73.456893][ T9059] RSP: 002b:00007fffd4d763b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 73.456902][ T9059] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 73.456906][ T9059] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 73.456911][ T9059] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 73.456916][ T9059] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 73.456920][ T9059] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 73.456931][ T9059] [ 73.456933][ T9059] The buggy address belongs to the variable: [ 73.456942][ T9059] transl_h+0x3e/0x40 [ 73.456944][ T9059] [ 73.456946][ T9059] Memory state around the buggy address: [ 73.456954][ T9059] ffffffff88751000: 00 00 00 00 fa fa fa fa 00 00 00 00 00 fa fa fa [ 73.456960][ T9059] ffffffff88751080: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00 [ 73.456966][ T9059] >ffffffff88751100: fa fa fa fa 00 00 00 00 fa fa fa fa 00 01 fa fa [ 73.456969][ T9059] ^ [ 73.456975][ T9059] ffffffff88751180: fa fa fa fa 00 00 00 04 fa fa fa fa 00 00 04 fa [ 73.456981][ T9059] ffffffff88751200: fa fa fa fa 00 00 00 00 00 00 02 fa fa fa fa fa [ 73.456984][ T9059] ================================================================== [ 73.456987][ T9059] Disabling lock debugging due to kernel taint [ 73.456992][ T9059] Kernel panic - not syncing: panic_on_warn set ... [ 73.457000][ T9059] CPU: 0 PID: 9059 Comm: syz-executor974 Tainted: G B 5.5.0-rc1-syzkaller #0 [ 73.457004][ T9059] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.457006][ T9059] Call Trace: [ 73.457013][ T9059] dump_stack+0x197/0x210 [ 73.457022][ T9059] panic+0x2e3/0x75c [ 73.457029][ T9059] ? add_taint.cold+0x16/0x16 [ 73.457040][ T9059] ? trace_hardirqs_on+0x67/0x240 [ 73.457047][ T9059] ? trace_hardirqs_on+0x5e/0x240 [ 73.457054][ T9059] ? vga16fb_imageblit+0x1c8b/0x2200 [ 73.457061][ T9059] end_report+0x47/0x4f [ 73.457067][ T9059] ? vga16fb_imageblit+0x1c8b/0x2200 [ 73.457079][ T9059] __kasan_report.cold+0xe/0x41 [ 73.457086][ T9059] ? vga16fb_imageblit+0x1c8b/0x2200 [ 73.457093][ T9059] kasan_report+0x12/0x20 [ 73.457101][ T9059] __asan_report_load2_noabort+0x14/0x20 [ 73.457107][ T9059] vga16fb_imageblit+0x1c8b/0x2200 [ 73.457113][ T9059] ? mark_lock+0xdf/0x1220 [ 73.457122][ T9059] soft_cursor+0x4fb/0xa30 [ 73.457129][ T9059] ? lockdep_hardirqs_on+0x421/0x5e0 [ 73.457137][ T9059] bit_cursor+0x12fc/0x1a60 [ 73.457146][ T9059] ? bit_clear+0x530/0x530 [ 73.457153][ T9059] ? fbcon_putcs+0x33c/0x3e0 [ 73.457160][ T9059] ? fbcon_putcs+0x343/0x3e0 [ 73.457170][ T9059] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 73.457177][ T9059] ? get_color+0x225/0x430 [ 73.457184][ T9059] fbcon_cursor+0x487/0x660 [ 73.457189][ T9059] ? bit_clear+0x530/0x530 [ 73.457197][ T9059] set_cursor+0x1fb/0x280 [ 73.457204][ T9059] redraw_screen+0x4e1/0x7d0 [ 73.457210][ T9059] ? efifb_probe.cold+0x181f/0x181f [ 73.457218][ T9059] ? respond_string+0x2c0/0x2c0 [ 73.457226][ T9059] ? fbcon_set_palette+0x3c4/0x4a0 [ 73.457235][ T9059] fbcon_modechanged+0x5c3/0x790 [ 73.457244][ T9059] fbcon_update_vcs+0x42/0x50 [ 73.457250][ T9059] fb_set_var+0xb32/0xdd0 [ 73.457257][ T9059] ? fb_blank+0x1a0/0x1a0 [ 73.457264][ T9059] ? lock_acquire+0x190/0x410 [ 73.457272][ T9059] ? __mutex_lock+0x458/0x13c0 [ 73.457278][ T9059] ? down+0x50/0x90 [ 73.457290][ T9059] ? do_fb_ioctl+0x335/0x7d0 [ 73.457299][ T9059] do_fb_ioctl+0x390/0x7d0 [ 73.457306][ T9059] ? fb_mmap+0x520/0x520 [ 73.457312][ T9059] ? tomoyo_path_number_perm+0x214/0x520 [ 73.457319][ T9059] ? find_held_lock+0x35/0x130 [ 73.457326][ T9059] ? tomoyo_path_number_perm+0x214/0x520 [ 73.457334][ T9059] ? lock_downgrade+0x920/0x920 [ 73.457346][ T9059] ? lockdep_hardirqs_on+0x421/0x5e0 [ 73.457355][ T9059] ? tomoyo_path_number_perm+0x454/0x520 [ 73.457369][ T9059] fb_ioctl+0xe6/0x130 [ 73.457375][ T9059] ? do_fb_ioctl+0x7d0/0x7d0 [ 73.457382][ T9059] do_vfs_ioctl+0x977/0x14e0 [ 73.457390][ T9059] ? compat_ioctl_preallocate+0x220/0x220 [ 73.457397][ T9059] ? kmem_cache_free+0x26b/0x320 [ 73.457404][ T9059] ? putname+0xf4/0x130 [ 73.457411][ T9059] ? do_sys_open+0x31d/0x5d0 [ 73.457419][ T9059] ? tomoyo_file_ioctl+0x23/0x30 [ 73.457426][ T9059] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.457433][ T9059] ? security_file_ioctl+0x8d/0xc0 [ 73.457440][ T9059] ksys_ioctl+0xab/0xd0 [ 73.457447][ T9059] __x64_sys_ioctl+0x73/0xb0 [ 73.457454][ T9059] do_syscall_64+0xfa/0x790 [ 73.457463][ T9059] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.457467][ T9059] RIP: 0033:0x440309 [ 73.457474][ T9059] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 73.457478][ T9059] RSP: 002b:00007fffd4d763b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 73.457484][ T9059] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 73.457488][ T9059] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 73.457493][ T9059] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 73.457497][ T9059] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 73.457501][ T9059] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 73.458780][ T9059] Kernel Offset: disabled [ 74.330169][ T9059] Rebooting in 86400 seconds..