[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 61.680771][ T23] audit: type=1800 audit(1575353125.248:25): pid=8949 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 61.717740][ T23] audit: type=1800 audit(1575353125.248:26): pid=8949 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 61.740009][ T23] audit: type=1800 audit(1575353125.248:27): pid=8949 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 '10.128.0.218' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 72.493219][ T9104] ================================================================== [ 72.493270][ T9104] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 72.493278][ T9104] Read of size 2 at addr ffffffff8874be58 by task syz-executor177/9104 [ 72.493281][ T9104] [ 72.493291][ T9104] CPU: 0 PID: 9104 Comm: syz-executor177 Not tainted 5.4.0-syzkaller #0 [ 72.493296][ T9104] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.493299][ T9104] Call Trace: [ 72.493314][ T9104] dump_stack+0x197/0x210 [ 72.493323][ T9104] ? vga16fb_imageblit+0x1c8b/0x2200 [ 72.493337][ T9104] print_address_description.constprop.0.cold+0x5/0x30b [ 72.493345][ T9104] ? vga16fb_imageblit+0x1c8b/0x2200 [ 72.493353][ T9104] ? vga16fb_imageblit+0x1c8b/0x2200 [ 72.493361][ T9104] __kasan_report.cold+0x1b/0x41 [ 72.493373][ T9104] ? vga16fb_imageblit+0x1c8b/0x2200 [ 72.493382][ T9104] kasan_report+0x12/0x20 [ 72.493392][ T9104] __asan_report_load2_noabort+0x14/0x20 [ 72.493400][ T9104] vga16fb_imageblit+0x1c8b/0x2200 [ 72.493417][ T9104] soft_cursor+0x4fb/0xa30 [ 72.493430][ T9104] ? __lock_task_sighand+0x125/0x2f0 [ 72.493443][ T9104] bit_cursor+0x12fc/0x1a60 [ 72.493457][ T9104] ? bit_clear+0x530/0x530 [ 72.493468][ T9104] ? find_held_lock+0x35/0x130 [ 72.493484][ T9104] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 72.493494][ T9104] ? get_color+0x225/0x430 [ 72.493514][ T9104] fbcon_cursor+0x487/0x660 [ 72.493522][ T9104] ? bit_clear+0x530/0x530 [ 72.493533][ T9104] hide_cursor+0x9d/0x2b0 [ 72.493542][ T9104] redraw_screen+0x60b/0x7d0 [ 72.493551][ T9104] ? respond_string+0x2c0/0x2c0 [ 72.493563][ T9104] vc_do_resize+0x10c9/0x1460 [ 72.493571][ T9104] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.493587][ T9104] ? vc_uniscr_alloc+0xd0/0xd0 [ 72.493601][ T9104] vc_resize+0x4d/0x60 [ 72.493610][ T9104] fbcon_modechanged+0x367/0x790 [ 72.493622][ T9104] fbcon_update_vcs+0x42/0x50 [ 72.493629][ T9104] fb_set_var+0xb32/0xdd0 [ 72.493638][ T9104] ? fb_blank+0x1a0/0x1a0 [ 72.493645][ T9104] ? lock_acquire+0x190/0x410 [ 72.493661][ T9104] ? __mutex_lock+0x458/0x13c0 [ 72.493668][ T9104] ? down+0x50/0x90 [ 72.493687][ T9104] ? do_fb_ioctl+0x335/0x7d0 [ 72.493699][ T9104] do_fb_ioctl+0x390/0x7d0 [ 72.493707][ T9104] ? fb_mmap+0x520/0x520 [ 72.493714][ T9104] ? lockdep_hardirqs_on+0x421/0x5e0 [ 72.493727][ T9104] ? tomoyo_path_number_perm+0x454/0x520 [ 72.493737][ T9104] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 72.493744][ T9104] ? tomoyo_path_number_perm+0x25e/0x520 [ 72.493754][ T9104] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 72.493779][ T9104] fb_compat_ioctl+0x305/0xc50 [ 72.493787][ T9104] ? fb_release+0x150/0x150 [ 72.493796][ T9104] ? do_sys_open+0x31d/0x5d0 [ 72.493807][ T9104] ? tomoyo_file_ioctl+0x23/0x30 [ 72.493815][ T9104] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.493823][ T9104] ? security_file_ioctl+0x8d/0xc0 [ 72.493836][ T9104] __ia32_compat_sys_ioctl+0x22d/0x5c0 [ 72.493844][ T9104] ? fb_release+0x150/0x150 [ 72.493858][ T9104] do_fast_syscall_32+0x27b/0xe16 [ 72.493874][ T9104] entry_SYSENTER_compat+0x70/0x7f [ 72.493960][ T9104] RIP: 0023:0xf7f02a39 [ 72.493975][ T9104] Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 72.493980][ T9104] RSP: 002b:00000000ff9c25ac EFLAGS: 00000213 ORIG_RAX: 0000000000000036 [ 72.493990][ T9104] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601 [ 72.493995][ T9104] RDX: 0000000020000100 RSI: 00000000080ea078 RDI: 00000000ff9c2600 [ 72.494000][ T9104] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 72.494004][ T9104] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 72.494009][ T9104] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 72.494021][ T9104] [ 72.494024][ T9104] The buggy address belongs to the variable: [ 72.494035][ T9104] transl_h+0x38/0x40 [ 72.494037][ T9104] [ 72.494039][ T9104] Memory state around the buggy address: [ 72.494048][ T9104] ffffffff8874bd00: 00 00 00 00 fa fa fa fa 00 00 00 00 fa fa fa fa [ 72.494055][ T9104] ffffffff8874bd80: 00 00 00 00 00 fa fa fa fa fa fa fa 04 fa fa fa [ 72.494061][ T9104] >ffffffff8874be00: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00 [ 72.494065][ T9104] ^ [ 72.494071][ T9104] ffffffff8874be80: fa fa fa fa 00 01 fa fa fa fa fa fa 00 00 00 04 [ 72.494078][ T9104] ffffffff8874bf00: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 00 00 [ 72.494081][ T9104] ================================================================== [ 72.494084][ T9104] Disabling lock debugging due to kernel taint [ 72.494089][ T9104] Kernel panic - not syncing: panic_on_warn set ... [ 72.494098][ T9104] CPU: 0 PID: 9104 Comm: syz-executor177 Tainted: G B 5.4.0-syzkaller #0 [ 72.494102][ T9104] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.494104][ T9104] Call Trace: [ 72.494116][ T9104] dump_stack+0x197/0x210 [ 72.494127][ T9104] panic+0x2e3/0x75c [ 72.494139][ T9104] ? add_taint.cold+0x16/0x16 [ 72.494153][ T9104] ? trace_hardirqs_on+0x67/0x240 [ 72.494159][ T9104] ? trace_hardirqs_on+0x5e/0x240 [ 72.494170][ T9104] ? vga16fb_imageblit+0x1c8b/0x2200 [ 72.494178][ T9104] end_report+0x47/0x4f [ 72.494186][ T9104] ? vga16fb_imageblit+0x1c8b/0x2200 [ 72.494193][ T9104] __kasan_report.cold+0xe/0x41 [ 72.494202][ T9104] ? vga16fb_imageblit+0x1c8b/0x2200 [ 72.494209][ T9104] kasan_report+0x12/0x20 [ 72.494217][ T9104] __asan_report_load2_noabort+0x14/0x20 [ 72.494225][ T9104] vga16fb_imageblit+0x1c8b/0x2200 [ 72.494236][ T9104] soft_cursor+0x4fb/0xa30 [ 72.494248][ T9104] ? __lock_task_sighand+0x125/0x2f0 [ 72.494258][ T9104] bit_cursor+0x12fc/0x1a60 [ 72.494269][ T9104] ? bit_clear+0x530/0x530 [ 72.494277][ T9104] ? find_held_lock+0x35/0x130 [ 72.494288][ T9104] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 72.494296][ T9104] ? get_color+0x225/0x430 [ 72.494304][ T9104] fbcon_cursor+0x487/0x660 [ 72.494312][ T9104] ? bit_clear+0x530/0x530 [ 72.494325][ T9104] hide_cursor+0x9d/0x2b0 [ 72.494333][ T9104] redraw_screen+0x60b/0x7d0 [ 72.494340][ T9104] ? respond_string+0x2c0/0x2c0 [ 72.494349][ T9104] vc_do_resize+0x10c9/0x1460 [ 72.494357][ T9104] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.494369][ T9104] ? vc_uniscr_alloc+0xd0/0xd0 [ 72.494381][ T9104] vc_resize+0x4d/0x60 [ 72.494389][ T9104] fbcon_modechanged+0x367/0x790 [ 72.494398][ T9104] fbcon_update_vcs+0x42/0x50 [ 72.494405][ T9104] fb_set_var+0xb32/0xdd0 [ 72.494412][ T9104] ? fb_blank+0x1a0/0x1a0 [ 72.494419][ T9104] ? lock_acquire+0x190/0x410 [ 72.494430][ T9104] ? __mutex_lock+0x458/0x13c0 [ 72.494437][ T9104] ? down+0x50/0x90 [ 72.494450][ T9104] ? do_fb_ioctl+0x335/0x7d0 [ 72.494459][ T9104] do_fb_ioctl+0x390/0x7d0 [ 72.494465][ T9104] ? fb_mmap+0x520/0x520 [ 72.494472][ T9104] ? lockdep_hardirqs_on+0x421/0x5e0 [ 72.494482][ T9104] ? tomoyo_path_number_perm+0x454/0x520 [ 72.494492][ T9104] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 72.494498][ T9104] ? tomoyo_path_number_perm+0x25e/0x520 [ 72.494506][ T9104] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 72.494525][ T9104] fb_compat_ioctl+0x305/0xc50 [ 72.494533][ T9104] ? fb_release+0x150/0x150 [ 72.494541][ T9104] ? do_sys_open+0x31d/0x5d0 [ 72.494550][ T9104] ? tomoyo_file_ioctl+0x23/0x30 [ 72.494558][ T9104] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.494565][ T9104] ? security_file_ioctl+0x8d/0xc0 [ 72.494577][ T9104] __ia32_compat_sys_ioctl+0x22d/0x5c0 [ 72.494583][ T9104] ? fb_release+0x150/0x150 [ 72.494596][ T9104] do_fast_syscall_32+0x27b/0xe16 [ 72.494604][ T9104] entry_SYSENTER_compat+0x70/0x7f [ 72.494610][ T9104] RIP: 0023:0xf7f02a39 [ 72.494618][ T9104] Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 72.494622][ T9104] RSP: 002b:00000000ff9c25ac EFLAGS: 00000213 ORIG_RAX: 0000000000000036 [ 72.494629][ T9104] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601 [ 72.494634][ T9104] RDX: 0000000020000100 RSI: 00000000080ea078 RDI: 00000000ff9c2600 [ 72.494638][ T9104] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 72.494643][ T9104] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 72.494647][ T9104] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 72.496283][ T9104] Kernel Offset: disabled [ 73.434732][ T9104] Rebooting in 86400 seconds..