[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 80.628980][ T23] audit: type=1800 audit(1581265833.435:25): pid=9493 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 80.648861][ T23] audit: type=1800 audit(1581265833.435:26): pid=9493 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 80.718460][ T23] audit: type=1800 audit(1581265833.435:27): pid=9493 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.11' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 91.101744][ T9644] IPVS: ftp: loaded support on port[0] = 21 [ 91.238196][ T9644] ================================================================== [ 91.238240][ T9644] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 91.238247][ T9644] Read of size 2 at addr ffffffff8896c23e by task syz-executor448/9644 [ 91.238249][ T9644] [ 91.238260][ T9644] CPU: 0 PID: 9644 Comm: syz-executor448 Not tainted 5.5.0-syzkaller #0 [ 91.238265][ T9644] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 91.238268][ T9644] Call Trace: [ 91.238280][ T9644] dump_stack+0x197/0x210 [ 91.238289][ T9644] ? vga16fb_imageblit+0x1c8b/0x2200 [ 91.238304][ T9644] print_address_description.constprop.0.cold+0x5/0x30b [ 91.238311][ T9644] ? vga16fb_imageblit+0x1c8b/0x2200 [ 91.238320][ T9644] ? vga16fb_imageblit+0x1c8b/0x2200 [ 91.238330][ T9644] __kasan_report.cold+0x1b/0x32 [ 91.238341][ T9644] ? vga16fb_imageblit+0x1c8b/0x2200 [ 91.238353][ T9644] kasan_report+0x12/0x20 [ 91.238364][ T9644] __asan_report_load2_noabort+0x14/0x20 [ 91.238373][ T9644] vga16fb_imageblit+0x1c8b/0x2200 [ 91.238382][ T9644] ? mark_lock+0x1bf/0x1220 [ 91.238403][ T9644] soft_cursor+0x4fb/0xa30 [ 91.238411][ T9644] ? lockdep_hardirqs_on+0x421/0x5e0 [ 91.238431][ T9644] bit_cursor+0x12fc/0x1a60 [ 91.238450][ T9644] ? bit_clear+0x530/0x530 [ 91.238457][ T9644] ? fbcon_putcs+0x33c/0x3e0 [ 91.238465][ T9644] ? fbcon_putcs+0x343/0x3e0 [ 91.238485][ T9644] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 91.238495][ T9644] ? get_color+0x225/0x430 [ 91.238511][ T9644] fbcon_cursor+0x487/0x660 [ 91.238520][ T9644] ? bit_clear+0x530/0x530 [ 91.238532][ T9644] set_cursor+0x1fb/0x280 [ 91.238541][ T9644] redraw_screen+0x4e1/0x7d0 [ 91.238549][ T9644] ? vesafb_probe.cold+0x1279/0x1279 [ 91.238559][ T9644] ? respond_string+0x2c0/0x2c0 [ 91.238571][ T9644] ? fbcon_set_palette+0x3c4/0x4a0 [ 91.238585][ T9644] fbcon_modechanged+0x5c3/0x790 [ 91.238600][ T9644] fbcon_update_vcs+0x42/0x50 [ 91.238609][ T9644] fb_set_var+0xb32/0xdd0 [ 91.238619][ T9644] ? fb_blank+0x1a0/0x1a0 [ 91.238627][ T9644] ? stack_depot_save+0x25a/0x450 [ 91.238642][ T9644] ? save_stack+0x5c/0x90 [ 91.238649][ T9644] ? save_stack+0x23/0x90 [ 91.238656][ T9644] ? __kasan_slab_free+0x102/0x150 [ 91.238664][ T9644] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 91.238673][ T9644] ? vga16fb_imageblit+0x1eb/0x2200 [ 91.238679][ T9644] ? vc_resize+0x4d/0x60 [ 91.238687][ T9644] ? fbcon_modechanged+0x367/0x790 [ 91.238694][ T9644] ? fbcon_update_vcs+0x4f/0x50 [ 91.238729][ T9644] ? bit_cursor+0xaf6/0x1a60 [ 91.238737][ T9644] ? fb_videomode_to_var+0x14/0x630 [ 91.238751][ T9644] fbcon_switch+0x556/0x17f0 [ 91.238767][ T9644] ? fbcon_set_def_font+0x360/0x360 [ 91.238791][ T9644] ? fbcon_cursor+0x48c/0x660 [ 91.238802][ T9644] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 91.238810][ T9644] ? fbcon_set_origin+0x2b/0x50 [ 91.238818][ T9644] ? fbcon_scrolldelta+0x1220/0x1220 [ 91.238826][ T9644] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 91.238838][ T9644] redraw_screen+0x2b6/0x7d0 [ 91.238845][ T9644] ? vesafb_probe.cold+0x1279/0x1279 [ 91.238856][ T9644] ? respond_string+0x2c0/0x2c0 [ 91.238867][ T9644] ? fbcon_set_palette+0x3c4/0x4a0 [ 91.238881][ T9644] fbcon_modechanged+0x5c3/0x790 [ 91.238896][ T9644] fbcon_update_vcs+0x42/0x50 [ 91.238904][ T9644] fb_set_var+0xb32/0xdd0 [ 91.238915][ T9644] ? fb_blank+0x1a0/0x1a0 [ 91.238924][ T9644] ? lock_acquire+0x190/0x410 [ 91.238943][ T9644] ? __mutex_lock+0x458/0x13c0 [ 91.238950][ T9644] ? down+0x50/0x90 [ 91.238981][ T9644] ? do_fb_ioctl+0x335/0x7d0 [ 91.238999][ T9644] do_fb_ioctl+0x390/0x7d0 [ 91.239008][ T9644] ? fb_mmap+0x560/0x560 [ 91.239017][ T9644] ? do_wp_page+0x54b/0x1540 [ 91.239043][ T9644] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 91.239053][ T9644] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 91.239063][ T9644] ? do_vfs_ioctl+0x568/0x13b0 [ 91.239089][ T9644] ? __kasan_check_write+0x14/0x20 [ 91.239098][ T9644] ? up_read+0x1cd/0x810 [ 91.239118][ T9644] fb_ioctl+0xe6/0x130 [ 91.239124][ T9644] ? do_fb_ioctl+0x7d0/0x7d0 [ 91.239134][ T9644] ksys_ioctl+0x123/0x180 [ 91.239147][ T9644] __x64_sys_ioctl+0x73/0xb0 [ 91.239159][ T9644] do_syscall_64+0xfa/0x790 [ 91.239171][ T9644] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 91.239178][ T9644] RIP: 0033:0x440be9 [ 91.239188][ T9644] 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 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 91.239192][ T9644] RSP: 002b:00007ffe4d015a58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 91.239200][ T9644] RAX: ffffffffffffffda RBX: 00000000004a2370 RCX: 0000000000440be9 [ 91.239205][ T9644] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 91.239210][ T9644] RBP: 00000000006cb018 R08: 0000000120080522 R09: 0000000120080522 [ 91.239215][ T9644] R10: 0000000120080522 R11: 0000000000000246 R12: 00000000004020f0 [ 91.239219][ T9644] R13: 0000000000402180 R14: 0000000000000000 R15: 0000000000000000 [ 91.239237][ T9644] [ 91.239240][ T9644] The buggy address belongs to the variable: [ 91.239247][ T9644] transl_h+0x3e/0x40 [ 91.239249][ T9644] [ 91.239251][ T9644] Memory state around the buggy address: [ 91.239259][ T9644] ffffffff8896c100: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00 [ 91.239265][ T9644] ffffffff8896c180: 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa fa [ 91.239271][ T9644] >ffffffff8896c200: 00 00 00 00 fa fa fa fa 00 00 00 00 fa fa fa fa [ 91.239274][ T9644] ^ [ 91.239280][ T9644] ffffffff8896c280: 00 01 fa fa fa fa fa fa 00 00 00 04 fa fa fa fa [ 91.239285][ T9644] ffffffff8896c300: 00 00 04 fa fa fa fa fa 00 00 00 00 00 00 02 fa [ 91.239288][ T9644] ================================================================== [ 91.239291][ T9644] Disabling lock debugging due to kernel taint [ 91.239336][ T9644] Kernel panic - not syncing: panic_on_warn set ... [ 91.239350][ T9644] CPU: 0 PID: 9644 Comm: syz-executor448 Tainted: G B 5.5.0-syzkaller #0 [ 91.239355][ T9644] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 91.239357][ T9644] Call Trace: [ 91.239369][ T9644] dump_stack+0x197/0x210 [ 91.239384][ T9644] panic+0x2e3/0x75c [ 91.239401][ T9644] ? add_taint.cold+0x16/0x16 [ 91.239421][ T9644] ? trace_hardirqs_on+0x5e/0x240 [ 91.239437][ T9644] ? trace_hardirqs_on+0x5e/0x240 [ 91.239454][ T9644] ? vga16fb_imageblit+0x1c8b/0x2200 [ 91.239470][ T9644] end_report+0x47/0x4f [ 91.239485][ T9644] ? vga16fb_imageblit+0x1c8b/0x2200 [ 91.239501][ T9644] __kasan_report.cold+0xe/0x32 [ 91.239517][ T9644] ? vga16fb_imageblit+0x1c8b/0x2200 [ 91.239533][ T9644] kasan_report+0x12/0x20 [ 91.239551][ T9644] __asan_report_load2_noabort+0x14/0x20 [ 91.239566][ T9644] vga16fb_imageblit+0x1c8b/0x2200 [ 91.239583][ T9644] ? mark_lock+0x1bf/0x1220 [ 91.239609][ T9644] soft_cursor+0x4fb/0xa30 [ 91.239661][ T9644] ? lockdep_hardirqs_on+0x421/0x5e0 [ 91.239686][ T9644] bit_cursor+0x12fc/0x1a60 [ 91.239719][ T9644] ? bit_clear+0x530/0x530 [ 91.239733][ T9644] ? fbcon_putcs+0x33c/0x3e0 [ 91.239748][ T9644] ? fbcon_putcs+0x343/0x3e0 [ 91.239773][ T9644] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 91.239789][ T9644] ? get_color+0x225/0x430 [ 91.239805][ T9644] fbcon_cursor+0x487/0x660 [ 91.239820][ T9644] ? bit_clear+0x530/0x530 [ 91.239835][ T9644] set_cursor+0x1fb/0x280 [ 91.239849][ T9644] redraw_screen+0x4e1/0x7d0 [ 91.239864][ T9644] ? vesafb_probe.cold+0x1279/0x1279 [ 91.239879][ T9644] ? respond_string+0x2c0/0x2c0 [ 91.239895][ T9644] ? fbcon_set_palette+0x3c4/0x4a0 [ 91.239911][ T9644] fbcon_modechanged+0x5c3/0x790 [ 91.239929][ T9644] fbcon_update_vcs+0x42/0x50 [ 91.239942][ T9644] fb_set_var+0xb32/0xdd0 [ 91.239957][ T9644] ? fb_blank+0x1a0/0x1a0 [ 91.239970][ T9644] ? stack_depot_save+0x25a/0x450 [ 91.239987][ T9644] ? save_stack+0x5c/0x90 [ 91.240001][ T9644] ? save_stack+0x23/0x90 [ 91.240016][ T9644] ? __kasan_slab_free+0x102/0x150 [ 91.240032][ T9644] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 91.240047][ T9644] ? vga16fb_imageblit+0x1eb/0x2200 [ 91.240061][ T9644] ? vc_resize+0x4d/0x60 [ 91.240075][ T9644] ? fbcon_modechanged+0x367/0x790 [ 91.240090][ T9644] ? fbcon_update_vcs+0x4f/0x50 [ 91.240134][ T9644] ? bit_cursor+0xaf6/0x1a60 [ 91.240149][ T9644] ? fb_videomode_to_var+0x14/0x630 [ 91.240165][ T9644] fbcon_switch+0x556/0x17f0 [ 91.240183][ T9644] ? fbcon_set_def_font+0x360/0x360 [ 91.240209][ T9644] ? fbcon_cursor+0x48c/0x660 [ 91.240226][ T9644] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 91.240241][ T9644] ? fbcon_set_origin+0x2b/0x50 [ 91.240256][ T9644] ? fbcon_scrolldelta+0x1220/0x1220 [ 91.240272][ T9644] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 91.240287][ T9644] redraw_screen+0x2b6/0x7d0 [ 91.240302][ T9644] ? vesafb_probe.cold+0x1279/0x1279 [ 91.240317][ T9644] ? respond_string+0x2c0/0x2c0 [ 91.240333][ T9644] ? fbcon_set_palette+0x3c4/0x4a0 [ 91.240349][ T9644] fbcon_modechanged+0x5c3/0x790 [ 91.240367][ T9644] fbcon_update_vcs+0x42/0x50 [ 91.240380][ T9644] fb_set_var+0xb32/0xdd0 [ 91.240394][ T9644] ? fb_blank+0x1a0/0x1a0 [ 91.240409][ T9644] ? lock_acquire+0x190/0x410 [ 91.240433][ T9644] ? __mutex_lock+0x458/0x13c0 [ 91.240448][ T9644] ? down+0x50/0x90 [ 91.240474][ T9644] ? do_fb_ioctl+0x335/0x7d0 [ 91.240488][ T9644] do_fb_ioctl+0x390/0x7d0 [ 91.240498][ T9644] ? fb_mmap+0x560/0x560 [ 91.240511][ T9644] ? do_wp_page+0x54b/0x1540 [ 91.240539][ T9644] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 91.240555][ T9644] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 91.240568][ T9644] ? do_vfs_ioctl+0x568/0x13b0 [ 91.240597][ T9644] ? __kasan_check_write+0x14/0x20 [ 91.240610][ T9644] ? up_read+0x1cd/0x810 [ 91.240626][ T9644] fb_ioctl+0xe6/0x130 [ 91.240640][ T9644] ? do_fb_ioctl+0x7d0/0x7d0 [ 91.240656][ T9644] ksys_ioctl+0x123/0x180 [ 91.240673][ T9644] __x64_sys_ioctl+0x73/0xb0 [ 91.240689][ T9644] do_syscall_64+0xfa/0x790 [ 91.240705][ T9644] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 91.240718][ T9644] RIP: 0033:0x440be9 [ 91.240732][ T9644] 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 7b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 91.240743][ T9644] RSP: 002b:00007ffe4d015a58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 91.240763][ T9644] RAX: ffffffffffffffda RBX: 00000000004a2370 RCX: 0000000000440be9 [ 91.240774][ T9644] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 91.240785][ T9644] RBP: 00000000006cb018 R08: 0000000120080522 R09: 0000000120080522 [ 91.240796][ T9644] R10: 0000000120080522 R11: 0000000000000246 R12: 00000000004020f0 [ 91.240807][ T9644] R13: 0000000000402180 R14: 0000000000000000 R15: 0000000000000000 [ 91.242374][ T9644] Kernel Offset: disabled [ 92.280397][ T9644] Rebooting in 86400 seconds..