[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 82.578365][ T27] audit: type=1800 audit(1582641699.524:25): pid=9568 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 82.603279][ T27] audit: type=1800 audit(1582641699.534:26): pid=9568 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 82.669491][ T27] audit: type=1800 audit(1582641699.534:27): pid=9568 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 '10.128.0.141' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 92.643008][ T9722] ================================================================== [ 92.643050][ T9722] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 92.643058][ T9722] Read of size 2 at addr ffffffff889715de by task syz-executor199/9722 [ 92.643060][ T9722] [ 92.643070][ T9722] CPU: 1 PID: 9722 Comm: syz-executor199 Not tainted 5.6.0-rc2-next-20200224-syzkaller #0 [ 92.643075][ T9722] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 92.643079][ T9722] Call Trace: [ 92.643090][ T9722] dump_stack+0x197/0x210 [ 92.643099][ T9722] ? vga16fb_imageblit+0x1c8b/0x2200 [ 92.643114][ T9722] print_address_description.constprop.0.cold+0x5/0x30b [ 92.643121][ T9722] ? vga16fb_imageblit+0x1c8b/0x2200 [ 92.643128][ T9722] ? vga16fb_imageblit+0x1c8b/0x2200 [ 92.643138][ T9722] __kasan_report.cold+0x1b/0x32 [ 92.643148][ T9722] ? vga16fb_imageblit+0x1c8b/0x2200 [ 92.643160][ T9722] kasan_report+0x12/0x20 [ 92.643168][ T9722] __asan_report_load2_noabort+0x14/0x20 [ 92.643176][ T9722] vga16fb_imageblit+0x1c8b/0x2200 [ 92.643186][ T9722] ? mark_lock+0x14f/0x1220 [ 92.643208][ T9722] soft_cursor+0x4fb/0xa30 [ 92.643216][ T9722] ? lockdep_hardirqs_on+0x421/0x5e0 [ 92.643234][ T9722] bit_cursor+0x12fc/0x1a60 [ 92.643251][ T9722] ? bit_clear+0x530/0x530 [ 92.643258][ T9722] ? fbcon_putcs+0x33c/0x3e0 [ 92.643264][ T9722] ? fbcon_putcs+0x343/0x3e0 [ 92.643285][ T9722] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 92.643294][ T9722] ? get_color+0x225/0x430 [ 92.643306][ T9722] fbcon_cursor+0x487/0x660 [ 92.643313][ T9722] ? bit_clear+0x530/0x530 [ 92.643326][ T9722] set_cursor+0x1fb/0x250 [ 92.643337][ T9722] redraw_screen+0x4e1/0x7d0 [ 92.643343][ T9722] ? vesafb_probe.cold+0x1279/0x1279 [ 92.643354][ T9722] ? respond_string+0x2c0/0x2c0 [ 92.643365][ T9722] ? fbcon_set_palette+0x3c4/0x4a0 [ 92.643377][ T9722] fbcon_modechanged+0x5c3/0x790 [ 92.643391][ T9722] fbcon_update_vcs+0x42/0x50 [ 92.643401][ T9722] fb_set_var+0xb32/0xdd0 [ 92.643413][ T9722] ? fb_blank+0x1a0/0x1a0 [ 92.643422][ T9722] ? stack_depot_save+0x25a/0x450 [ 92.643437][ T9722] ? save_stack+0x5c/0x90 [ 92.643444][ T9722] ? save_stack+0x23/0x90 [ 92.643451][ T9722] ? __kasan_slab_free+0x102/0x150 [ 92.643459][ T9722] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 92.643466][ T9722] ? vga16fb_imageblit+0x1eb/0x2200 [ 92.643473][ T9722] ? vc_resize+0x4d/0x60 [ 92.643480][ T9722] ? fbcon_modechanged+0x367/0x790 [ 92.643486][ T9722] ? fbcon_resize+0xaf/0x780 [ 92.643518][ T9722] ? bit_cursor+0xaf6/0x1a60 [ 92.643526][ T9722] ? fb_videomode_to_var+0x14/0x630 [ 92.643539][ T9722] fbcon_switch+0x556/0x17f0 [ 92.643553][ T9722] ? fbcon_set_def_font+0x360/0x360 [ 92.643575][ T9722] ? fbcon_cursor+0x48c/0x660 [ 92.643586][ T9722] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.643593][ T9722] ? fbcon_set_origin+0x2b/0x50 [ 92.643600][ T9722] ? fbcon_scrolldelta+0x1220/0x1220 [ 92.643608][ T9722] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.643620][ T9722] redraw_screen+0x2b6/0x7d0 [ 92.643627][ T9722] ? vesafb_probe.cold+0x1279/0x1279 [ 92.643638][ T9722] ? respond_string+0x2c0/0x2c0 [ 92.643655][ T9722] ? fbcon_set_palette+0x3c4/0x4a0 [ 92.643668][ T9722] fbcon_modechanged+0x5c3/0x790 [ 92.643682][ T9722] fbcon_update_vcs+0x42/0x50 [ 92.643696][ T9722] fb_set_var+0xb32/0xdd0 [ 92.643707][ T9722] ? fb_blank+0x1a0/0x1a0 [ 92.643715][ T9722] ? lock_acquire+0x190/0x410 [ 92.643734][ T9722] ? __mutex_lock+0x458/0x13c0 [ 92.643743][ T9722] ? down+0x50/0x90 [ 92.643772][ T9722] ? do_fb_ioctl+0x335/0x6e0 [ 92.643790][ T9722] do_fb_ioctl+0x390/0x6e0 [ 92.643800][ T9722] ? fb_mmap+0x560/0x560 [ 92.643819][ T9722] ? trace_hardirqs_on+0x67/0x240 [ 92.643835][ T9722] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 92.643844][ T9722] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 92.643852][ T9722] ? do_vfs_ioctl+0x568/0x13b0 [ 92.643888][ T9722] fb_ioctl+0xe6/0x130 [ 92.643895][ T9722] ? do_fb_ioctl+0x6e0/0x6e0 [ 92.643904][ T9722] ksys_ioctl+0x123/0x180 [ 92.643915][ T9722] __x64_sys_ioctl+0x73/0xb0 [ 92.643927][ T9722] do_syscall_64+0xfa/0x790 [ 92.643940][ T9722] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 92.643947][ T9722] RIP: 0033:0x440309 [ 92.643957][ T9722] 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 [ 92.643961][ T9722] RSP: 002b:00007fff867b35f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 92.643969][ T9722] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 92.643973][ T9722] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 92.643978][ T9722] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 92.643982][ T9722] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 92.643987][ T9722] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 92.644004][ T9722] [ 92.644007][ T9722] The buggy address belongs to the variable: [ 92.644013][ T9722] transl_h+0x3e/0x40 [ 92.644015][ T9722] [ 92.644018][ T9722] Memory state around the buggy address: [ 92.644025][ T9722] ffffffff88971480: 04 fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00 [ 92.644030][ T9722] ffffffff88971500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fa [ 92.644036][ T9722] >ffffffff88971580: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00 [ 92.644040][ T9722] ^ [ 92.644045][ T9722] ffffffff88971600: fa fa fa fa 00 01 fa fa fa fa fa fa 00 00 00 04 [ 92.644051][ T9722] ffffffff88971680: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 00 00 [ 92.644054][ T9722] ================================================================== [ 92.644057][ T9722] Disabling lock debugging due to kernel taint [ 92.644061][ T9722] Kernel panic - not syncing: panic_on_warn set ... [ 92.644069][ T9722] CPU: 1 PID: 9722 Comm: syz-executor199 Tainted: G B 5.6.0-rc2-next-20200224-syzkaller #0 [ 92.644073][ T9722] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 92.644075][ T9722] Call Trace: [ 92.644082][ T9722] dump_stack+0x197/0x210 [ 92.644092][ T9722] panic+0x2e3/0x75c [ 92.644099][ T9722] ? add_taint.cold+0x16/0x16 [ 92.644110][ T9722] ? trace_hardirqs_on+0x67/0x240 [ 92.644117][ T9722] ? trace_hardirqs_on+0x5e/0x240 [ 92.644126][ T9722] ? vga16fb_imageblit+0x1c8b/0x2200 [ 92.644134][ T9722] end_report+0x47/0x4f [ 92.644140][ T9722] ? vga16fb_imageblit+0x1c8b/0x2200 [ 92.644147][ T9722] __kasan_report.cold+0xe/0x32 [ 92.644156][ T9722] ? vga16fb_imageblit+0x1c8b/0x2200 [ 92.644164][ T9722] kasan_report+0x12/0x20 [ 92.644171][ T9722] __asan_report_load2_noabort+0x14/0x20 [ 92.644178][ T9722] vga16fb_imageblit+0x1c8b/0x2200 [ 92.644185][ T9722] ? mark_lock+0x14f/0x1220 [ 92.644199][ T9722] soft_cursor+0x4fb/0xa30 [ 92.644205][ T9722] ? lockdep_hardirqs_on+0x421/0x5e0 [ 92.644217][ T9722] bit_cursor+0x12fc/0x1a60 [ 92.644233][ T9722] ? bit_clear+0x530/0x530 [ 92.644239][ T9722] ? fbcon_putcs+0x33c/0x3e0 [ 92.644245][ T9722] ? fbcon_putcs+0x343/0x3e0 [ 92.644257][ T9722] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 92.644264][ T9722] ? get_color+0x225/0x430 [ 92.644272][ T9722] fbcon_cursor+0x487/0x660 [ 92.644279][ T9722] ? bit_clear+0x530/0x530 [ 92.644288][ T9722] set_cursor+0x1fb/0x250 [ 92.644296][ T9722] redraw_screen+0x4e1/0x7d0 [ 92.644302][ T9722] ? vesafb_probe.cold+0x1279/0x1279 [ 92.644310][ T9722] ? respond_string+0x2c0/0x2c0 [ 92.644318][ T9722] ? fbcon_set_palette+0x3c4/0x4a0 [ 92.644327][ T9722] fbcon_modechanged+0x5c3/0x790 [ 92.644336][ T9722] fbcon_update_vcs+0x42/0x50 [ 92.644344][ T9722] fb_set_var+0xb32/0xdd0 [ 92.644352][ T9722] ? fb_blank+0x1a0/0x1a0 [ 92.644359][ T9722] ? stack_depot_save+0x25a/0x450 [ 92.644369][ T9722] ? save_stack+0x5c/0x90 [ 92.644375][ T9722] ? save_stack+0x23/0x90 [ 92.644382][ T9722] ? __kasan_slab_free+0x102/0x150 [ 92.644389][ T9722] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 92.644396][ T9722] ? vga16fb_imageblit+0x1eb/0x2200 [ 92.644403][ T9722] ? vc_resize+0x4d/0x60 [ 92.644409][ T9722] ? fbcon_modechanged+0x367/0x790 [ 92.644414][ T9722] ? fbcon_resize+0xaf/0x780 [ 92.644432][ T9722] ? bit_cursor+0xaf6/0x1a60 [ 92.644439][ T9722] ? fb_videomode_to_var+0x14/0x630 [ 92.644447][ T9722] fbcon_switch+0x556/0x17f0 [ 92.644457][ T9722] ? fbcon_set_def_font+0x360/0x360 [ 92.644470][ T9722] ? fbcon_cursor+0x48c/0x660 [ 92.644479][ T9722] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.644485][ T9722] ? fbcon_set_origin+0x2b/0x50 [ 92.644491][ T9722] ? fbcon_scrolldelta+0x1220/0x1220 [ 92.644499][ T9722] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 92.644508][ T9722] redraw_screen+0x2b6/0x7d0 [ 92.644514][ T9722] ? vesafb_probe.cold+0x1279/0x1279 [ 92.644522][ T9722] ? respond_string+0x2c0/0x2c0 [ 92.644530][ T9722] ? fbcon_set_palette+0x3c4/0x4a0 [ 92.644539][ T9722] fbcon_modechanged+0x5c3/0x790 [ 92.644548][ T9722] fbcon_update_vcs+0x42/0x50 [ 92.644556][ T9722] fb_set_var+0xb32/0xdd0 [ 92.644564][ T9722] ? fb_blank+0x1a0/0x1a0 [ 92.644571][ T9722] ? lock_acquire+0x190/0x410 [ 92.644582][ T9722] ? __mutex_lock+0x458/0x13c0 [ 92.644588][ T9722] ? down+0x50/0x90 [ 92.644605][ T9722] ? do_fb_ioctl+0x335/0x6e0 [ 92.644616][ T9722] do_fb_ioctl+0x390/0x6e0 [ 92.644624][ T9722] ? fb_mmap+0x560/0x560 [ 92.644636][ T9722] ? trace_hardirqs_on+0x67/0x240 [ 92.644647][ T9722] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 92.644655][ T9722] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 92.644660][ T9722] ? do_vfs_ioctl+0x568/0x13b0 [ 92.644680][ T9722] fb_ioctl+0xe6/0x130 [ 92.644690][ T9722] ? do_fb_ioctl+0x6e0/0x6e0 [ 92.644697][ T9722] ksys_ioctl+0x123/0x180 [ 92.644705][ T9722] __x64_sys_ioctl+0x73/0xb0 [ 92.644713][ T9722] do_syscall_64+0xfa/0x790 [ 92.644723][ T9722] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 92.644728][ T9722] RIP: 0033:0x440309 [ 92.644734][ T9722] 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 [ 92.644738][ T9722] RSP: 002b:00007fff867b35f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 92.644744][ T9722] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 92.644748][ T9722] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 92.644752][ T9722] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 92.644756][ T9722] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 92.644760][ T9722] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 92.645932][ T9722] Kernel Offset: disabled [ 93.668048][ T9722] Rebooting in 86400 seconds..