[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 65.246809][ T25] audit: type=1800 audit(1575362933.631:25): pid=8850 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 65.266513][ T25] audit: type=1800 audit(1575362933.641:26): pid=8850 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 65.308166][ T25] audit: type=1800 audit(1575362933.641:27): pid=8850 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 '10.128.0.166' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.708927][ T9002] ================================================================== [ 74.708980][ T9002] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 74.708988][ T9002] Read of size 2 at addr ffffffff8874be58 by task syz-executor106/9002 [ 74.708990][ T9002] [ 74.709000][ T9002] CPU: 1 PID: 9002 Comm: syz-executor106 Not tainted 5.4.0-syzkaller #0 [ 74.709005][ T9002] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.709008][ T9002] Call Trace: [ 74.709021][ T9002] dump_stack+0x197/0x210 [ 74.709029][ T9002] ? vga16fb_imageblit+0x1c8b/0x2200 [ 74.709042][ T9002] print_address_description.constprop.0.cold+0x5/0x30b [ 74.709050][ T9002] ? vga16fb_imageblit+0x1c8b/0x2200 [ 74.709058][ T9002] ? vga16fb_imageblit+0x1c8b/0x2200 [ 74.709065][ T9002] __kasan_report.cold+0x1b/0x41 [ 74.709075][ T9002] ? vga16fb_imageblit+0x1c8b/0x2200 [ 74.709084][ T9002] kasan_report+0x12/0x20 [ 74.709092][ T9002] __asan_report_load2_noabort+0x14/0x20 [ 74.709100][ T9002] vga16fb_imageblit+0x1c8b/0x2200 [ 74.709117][ T9002] soft_cursor+0x4fb/0xa30 [ 74.709128][ T9002] ? __lock_task_sighand+0x125/0x2f0 [ 74.709142][ T9002] bit_cursor+0x12fc/0x1a60 [ 74.709155][ T9002] ? bit_clear+0x530/0x530 [ 74.709165][ T9002] ? find_held_lock+0x35/0x130 [ 74.709180][ T9002] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 74.709189][ T9002] ? get_color+0x225/0x430 [ 74.709199][ T9002] fbcon_cursor+0x487/0x660 [ 74.709207][ T9002] ? bit_clear+0x530/0x530 [ 74.709217][ T9002] hide_cursor+0x9d/0x2b0 [ 74.709226][ T9002] redraw_screen+0x60b/0x7d0 [ 74.709235][ T9002] ? respond_string+0x2c0/0x2c0 [ 74.709247][ T9002] vc_do_resize+0x10c9/0x1460 [ 74.709256][ T9002] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 74.709271][ T9002] ? vc_uniscr_alloc+0xd0/0xd0 [ 74.709285][ T9002] vc_resize+0x4d/0x60 [ 74.709294][ T9002] fbcon_modechanged+0x367/0x790 [ 74.709306][ T9002] fbcon_update_vcs+0x42/0x50 [ 74.709313][ T9002] fb_set_var+0xb32/0xdd0 [ 74.709322][ T9002] ? fb_blank+0x1a0/0x1a0 [ 74.709329][ T9002] ? lock_acquire+0x190/0x410 [ 74.709344][ T9002] ? __mutex_lock+0x458/0x13c0 [ 74.709351][ T9002] ? down+0x50/0x90 [ 74.709370][ T9002] ? do_fb_ioctl+0x335/0x7d0 [ 74.709382][ T9002] do_fb_ioctl+0x390/0x7d0 [ 74.709390][ T9002] ? fb_mmap+0x520/0x520 [ 74.709397][ T9002] ? lockdep_hardirqs_on+0x421/0x5e0 [ 74.709408][ T9002] ? tomoyo_path_number_perm+0x454/0x520 [ 74.709418][ T9002] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 74.709426][ T9002] ? tomoyo_path_number_perm+0x25e/0x520 [ 74.709435][ T9002] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 74.709461][ T9002] fb_compat_ioctl+0x305/0xc50 [ 74.709469][ T9002] ? fb_release+0x150/0x150 [ 74.709477][ T9002] ? do_sys_open+0x31d/0x5d0 [ 74.709488][ T9002] ? tomoyo_file_ioctl+0x23/0x30 [ 74.709496][ T9002] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 74.709503][ T9002] ? security_file_ioctl+0x8d/0xc0 [ 74.709514][ T9002] __ia32_compat_sys_ioctl+0x22d/0x5c0 [ 74.709521][ T9002] ? fb_release+0x150/0x150 [ 74.709532][ T9002] do_fast_syscall_32+0x27b/0xe16 [ 74.709542][ T9002] entry_SYSENTER_compat+0x70/0x7f [ 74.709550][ T9002] RIP: 0023:0xf7faba39 [ 74.709559][ T9002] 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 [ 74.709563][ T9002] RSP: 002b:00000000fff74f4c EFLAGS: 00000213 ORIG_RAX: 0000000000000036 [ 74.709572][ T9002] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601 [ 74.709576][ T9002] RDX: 0000000020000340 RSI: 00000000080ea078 RDI: 00000000fff74fa0 [ 74.709581][ T9002] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 74.709586][ T9002] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 74.709590][ T9002] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 74.709601][ T9002] [ 74.709603][ T9002] The buggy address belongs to the variable: [ 74.709611][ T9002] transl_h+0x38/0x40 [ 74.709613][ T9002] [ 74.709616][ T9002] Memory state around the buggy address: [ 74.709623][ T9002] ffffffff8874bd00: 00 00 00 00 fa fa fa fa 00 00 00 00 fa fa fa fa [ 74.709629][ T9002] ffffffff8874bd80: 00 00 00 00 00 fa fa fa fa fa fa fa 04 fa fa fa [ 74.709635][ T9002] >ffffffff8874be00: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00 [ 74.709638][ T9002] ^ [ 74.709644][ T9002] ffffffff8874be80: fa fa fa fa 00 01 fa fa fa fa fa fa 00 00 00 04 [ 74.709650][ T9002] ffffffff8874bf00: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 00 00 [ 74.709653][ T9002] ================================================================== [ 74.709656][ T9002] Disabling lock debugging due to kernel taint [ 74.709660][ T9002] Kernel panic - not syncing: panic_on_warn set ... [ 74.709668][ T9002] CPU: 1 PID: 9002 Comm: syz-executor106 Tainted: G B 5.4.0-syzkaller #0 [ 74.709671][ T9002] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.709673][ T9002] Call Trace: [ 74.709681][ T9002] dump_stack+0x197/0x210 [ 74.709690][ T9002] panic+0x2e3/0x75c [ 74.709697][ T9002] ? add_taint.cold+0x16/0x16 [ 74.709708][ T9002] ? trace_hardirqs_on+0x67/0x240 [ 74.709715][ T9002] ? trace_hardirqs_on+0x5e/0x240 [ 74.709724][ T9002] ? vga16fb_imageblit+0x1c8b/0x2200 [ 74.709730][ T9002] end_report+0x47/0x4f [ 74.709738][ T9002] ? vga16fb_imageblit+0x1c8b/0x2200 [ 74.709744][ T9002] __kasan_report.cold+0xe/0x41 [ 74.709752][ T9002] ? vga16fb_imageblit+0x1c8b/0x2200 [ 74.709759][ T9002] kasan_report+0x12/0x20 [ 74.709767][ T9002] __asan_report_load2_noabort+0x14/0x20 [ 74.709774][ T9002] vga16fb_imageblit+0x1c8b/0x2200 [ 74.709785][ T9002] soft_cursor+0x4fb/0xa30 [ 74.709792][ T9002] ? __lock_task_sighand+0x125/0x2f0 [ 74.709802][ T9002] bit_cursor+0x12fc/0x1a60 [ 74.709812][ T9002] ? bit_clear+0x530/0x530 [ 74.709820][ T9002] ? find_held_lock+0x35/0x130 [ 74.709830][ T9002] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 74.709837][ T9002] ? get_color+0x225/0x430 [ 74.709845][ T9002] fbcon_cursor+0x487/0x660 [ 74.709852][ T9002] ? bit_clear+0x530/0x530 [ 74.709859][ T9002] hide_cursor+0x9d/0x2b0 [ 74.709866][ T9002] redraw_screen+0x60b/0x7d0 [ 74.709873][ T9002] ? respond_string+0x2c0/0x2c0 [ 74.709882][ T9002] vc_do_resize+0x10c9/0x1460 [ 74.709890][ T9002] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 74.709901][ T9002] ? vc_uniscr_alloc+0xd0/0xd0 [ 74.709910][ T9002] vc_resize+0x4d/0x60 [ 74.709918][ T9002] fbcon_modechanged+0x367/0x790 [ 74.709927][ T9002] fbcon_update_vcs+0x42/0x50 [ 74.709933][ T9002] fb_set_var+0xb32/0xdd0 [ 74.709940][ T9002] ? fb_blank+0x1a0/0x1a0 [ 74.709951][ T9002] ? lock_acquire+0x190/0x410 [ 74.709960][ T9002] ? __mutex_lock+0x458/0x13c0 [ 74.709966][ T9002] ? down+0x50/0x90 [ 74.709978][ T9002] ? do_fb_ioctl+0x335/0x7d0 [ 74.709987][ T9002] do_fb_ioctl+0x390/0x7d0 [ 74.709993][ T9002] ? fb_mmap+0x520/0x520 [ 74.709999][ T9002] ? lockdep_hardirqs_on+0x421/0x5e0 [ 74.710009][ T9002] ? tomoyo_path_number_perm+0x454/0x520 [ 74.710018][ T9002] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 74.710024][ T9002] ? tomoyo_path_number_perm+0x25e/0x520 [ 74.710032][ T9002] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 74.710047][ T9002] fb_compat_ioctl+0x305/0xc50 [ 74.710054][ T9002] ? fb_release+0x150/0x150 [ 74.710060][ T9002] ? do_sys_open+0x31d/0x5d0 [ 74.710069][ T9002] ? tomoyo_file_ioctl+0x23/0x30 [ 74.710076][ T9002] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 74.710082][ T9002] ? security_file_ioctl+0x8d/0xc0 [ 74.710090][ T9002] __ia32_compat_sys_ioctl+0x22d/0x5c0 [ 74.710097][ T9002] ? fb_release+0x150/0x150 [ 74.710105][ T9002] do_fast_syscall_32+0x27b/0xe16 [ 74.710113][ T9002] entry_SYSENTER_compat+0x70/0x7f [ 74.710117][ T9002] RIP: 0023:0xf7faba39 [ 74.710124][ T9002] 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 [ 74.710127][ T9002] RSP: 002b:00000000fff74f4c EFLAGS: 00000213 ORIG_RAX: 0000000000000036 [ 74.710134][ T9002] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601 [ 74.710138][ T9002] RDX: 0000000020000340 RSI: 00000000080ea078 RDI: 00000000fff74fa0 [ 74.710142][ T9002] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 74.710146][ T9002] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 74.710149][ T9002] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 74.711698][ T9002] Kernel Offset: disabled [ 75.535947][ T9002] Rebooting in 86400 seconds..