[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 61.434178][ T23] audit: type=1800 audit(1575349936.368:25): pid=8836 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 61.454664][ T23] audit: type=1800 audit(1575349936.368:26): pid=8836 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 61.478358][ T23] audit: type=1800 audit(1575349936.368:27): pid=8836 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: [ 70.277203][ T8988] ================================================================== [ 70.277251][ T8988] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 70.277259][ T8988] Read of size 2 at addr ffffffff8874be58 by task syz-executor421/8988 [ 70.277261][ T8988] [ 70.277271][ T8988] CPU: 0 PID: 8988 Comm: syz-executor421 Not tainted 5.4.0-syzkaller #0 [ 70.277276][ T8988] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.277279][ T8988] Call Trace: [ 70.277291][ T8988] dump_stack+0x197/0x210 [ 70.277300][ T8988] ? vga16fb_imageblit+0x1c8b/0x2200 [ 70.277312][ T8988] print_address_description.constprop.0.cold+0x5/0x30b [ 70.277320][ T8988] ? vga16fb_imageblit+0x1c8b/0x2200 [ 70.277328][ T8988] ? vga16fb_imageblit+0x1c8b/0x2200 [ 70.277335][ T8988] __kasan_report.cold+0x1b/0x41 [ 70.277345][ T8988] ? vga16fb_imageblit+0x1c8b/0x2200 [ 70.277354][ T8988] kasan_report+0x12/0x20 [ 70.277362][ T8988] __asan_report_load2_noabort+0x14/0x20 [ 70.277371][ T8988] vga16fb_imageblit+0x1c8b/0x2200 [ 70.277388][ T8988] soft_cursor+0x4fb/0xa30 [ 70.277399][ T8988] ? __lock_task_sighand+0x125/0x2f0 [ 70.277413][ T8988] bit_cursor+0x12fc/0x1a60 [ 70.277426][ T8988] ? bit_clear+0x530/0x530 [ 70.277436][ T8988] ? find_held_lock+0x35/0x130 [ 70.277451][ T8988] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 70.277461][ T8988] ? get_color+0x225/0x430 [ 70.277471][ T8988] fbcon_cursor+0x487/0x660 [ 70.277479][ T8988] ? bit_clear+0x530/0x530 [ 70.277489][ T8988] hide_cursor+0x9d/0x2b0 [ 70.277498][ T8988] redraw_screen+0x60b/0x7d0 [ 70.277507][ T8988] ? respond_string+0x2c0/0x2c0 [ 70.277519][ T8988] vc_do_resize+0x10c9/0x1460 [ 70.277527][ T8988] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 70.277543][ T8988] ? vc_uniscr_alloc+0xd0/0xd0 [ 70.277557][ T8988] vc_resize+0x4d/0x60 [ 70.277566][ T8988] fbcon_modechanged+0x367/0x790 [ 70.277577][ T8988] fbcon_update_vcs+0x42/0x50 [ 70.277585][ T8988] fb_set_var+0xb32/0xdd0 [ 70.277593][ T8988] ? fb_blank+0x1a0/0x1a0 [ 70.277601][ T8988] ? lock_acquire+0x190/0x410 [ 70.277614][ T8988] ? __mutex_lock+0x458/0x13c0 [ 70.277621][ T8988] ? down+0x50/0x90 [ 70.277640][ T8988] ? do_fb_ioctl+0x335/0x7d0 [ 70.277652][ T8988] do_fb_ioctl+0x390/0x7d0 [ 70.277660][ T8988] ? fb_mmap+0x520/0x520 [ 70.277672][ T8988] ? tomoyo_path_number_perm+0x214/0x520 [ 70.277681][ T8988] ? find_held_lock+0x35/0x130 [ 70.277689][ T8988] ? tomoyo_path_number_perm+0x214/0x520 [ 70.277700][ T8988] ? lock_downgrade+0x920/0x920 [ 70.277707][ T8988] ? lockdep_hardirqs_on+0x421/0x5e0 [ 70.277717][ T8988] ? tomoyo_path_number_perm+0x454/0x520 [ 70.277744][ T8988] fb_ioctl+0xe6/0x130 [ 70.277750][ T8988] ? do_fb_ioctl+0x7d0/0x7d0 [ 70.277760][ T8988] do_vfs_ioctl+0xdb6/0x13e0 [ 70.277770][ T8988] ? compat_ioctl_preallocate+0x210/0x210 [ 70.277778][ T8988] ? kmem_cache_free+0x26b/0x320 [ 70.277788][ T8988] ? putname+0xf4/0x130 [ 70.277797][ T8988] ? do_sys_open+0x31d/0x5d0 [ 70.277807][ T8988] ? tomoyo_file_ioctl+0x23/0x30 [ 70.277815][ T8988] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 70.277823][ T8988] ? security_file_ioctl+0x8d/0xc0 [ 70.277831][ T8988] ksys_ioctl+0xab/0xd0 [ 70.277840][ T8988] __x64_sys_ioctl+0x73/0xb0 [ 70.277853][ T8988] do_syscall_64+0xfa/0x790 [ 70.277866][ T8988] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.277875][ T8988] RIP: 0033:0x440309 [ 70.277884][ T8988] 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 [ 70.277889][ T8988] RSP: 002b:00007ffe5b970878 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 70.277897][ T8988] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 70.277902][ T8988] RDX: 0000000020000100 RSI: 0000000000004601 RDI: 0000000000000003 [ 70.277907][ T8988] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 70.277911][ T8988] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 70.277916][ T8988] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 70.277926][ T8988] [ 70.277929][ T8988] The buggy address belongs to the variable: [ 70.277937][ T8988] transl_h+0x38/0x40 [ 70.277939][ T8988] [ 70.277941][ T8988] Memory state around the buggy address: [ 70.277948][ T8988] ffffffff8874bd00: 00 00 00 00 fa fa fa fa 00 00 00 00 fa fa fa fa [ 70.277954][ T8988] ffffffff8874bd80: 00 00 00 00 00 fa fa fa fa fa fa fa 04 fa fa fa [ 70.277960][ T8988] >ffffffff8874be00: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00 [ 70.277963][ T8988] ^ [ 70.277969][ T8988] ffffffff8874be80: fa fa fa fa 00 01 fa fa fa fa fa fa 00 00 00 04 [ 70.277975][ T8988] ffffffff8874bf00: fa fa fa fa 00 00 04 fa fa fa fa fa 00 00 00 00 [ 70.277978][ T8988] ================================================================== [ 70.277981][ T8988] Disabling lock debugging due to kernel taint [ 70.277985][ T8988] Kernel panic - not syncing: panic_on_warn set ... [ 70.277993][ T8988] CPU: 0 PID: 8988 Comm: syz-executor421 Tainted: G B 5.4.0-syzkaller #0 [ 70.277997][ T8988] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.277999][ T8988] Call Trace: [ 70.278006][ T8988] dump_stack+0x197/0x210 [ 70.278016][ T8988] panic+0x2e3/0x75c [ 70.278023][ T8988] ? add_taint.cold+0x16/0x16 [ 70.278034][ T8988] ? trace_hardirqs_on+0x67/0x240 [ 70.278041][ T8988] ? trace_hardirqs_on+0x5e/0x240 [ 70.278049][ T8988] ? vga16fb_imageblit+0x1c8b/0x2200 [ 70.278056][ T8988] end_report+0x47/0x4f [ 70.278063][ T8988] ? vga16fb_imageblit+0x1c8b/0x2200 [ 70.278069][ T8988] __kasan_report.cold+0xe/0x41 [ 70.278078][ T8988] ? vga16fb_imageblit+0x1c8b/0x2200 [ 70.278085][ T8988] kasan_report+0x12/0x20 [ 70.278092][ T8988] __asan_report_load2_noabort+0x14/0x20 [ 70.278099][ T8988] vga16fb_imageblit+0x1c8b/0x2200 [ 70.278110][ T8988] soft_cursor+0x4fb/0xa30 [ 70.278118][ T8988] ? __lock_task_sighand+0x125/0x2f0 [ 70.278128][ T8988] bit_cursor+0x12fc/0x1a60 [ 70.278138][ T8988] ? bit_clear+0x530/0x530 [ 70.278145][ T8988] ? find_held_lock+0x35/0x130 [ 70.278155][ T8988] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 70.278162][ T8988] ? get_color+0x225/0x430 [ 70.278171][ T8988] fbcon_cursor+0x487/0x660 [ 70.278178][ T8988] ? bit_clear+0x530/0x530 [ 70.278184][ T8988] hide_cursor+0x9d/0x2b0 [ 70.278191][ T8988] redraw_screen+0x60b/0x7d0 [ 70.278198][ T8988] ? respond_string+0x2c0/0x2c0 [ 70.278207][ T8988] vc_do_resize+0x10c9/0x1460 [ 70.278215][ T8988] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 70.278225][ T8988] ? vc_uniscr_alloc+0xd0/0xd0 [ 70.278239][ T8988] vc_resize+0x4d/0x60 [ 70.278246][ T8988] fbcon_modechanged+0x367/0x790 [ 70.278255][ T8988] fbcon_update_vcs+0x42/0x50 [ 70.278262][ T8988] fb_set_var+0xb32/0xdd0 [ 70.278268][ T8988] ? fb_blank+0x1a0/0x1a0 [ 70.278275][ T8988] ? lock_acquire+0x190/0x410 [ 70.278284][ T8988] ? __mutex_lock+0x458/0x13c0 [ 70.278290][ T8988] ? down+0x50/0x90 [ 70.278302][ T8988] ? do_fb_ioctl+0x335/0x7d0 [ 70.278311][ T8988] do_fb_ioctl+0x390/0x7d0 [ 70.278317][ T8988] ? fb_mmap+0x520/0x520 [ 70.278323][ T8988] ? tomoyo_path_number_perm+0x214/0x520 [ 70.278331][ T8988] ? find_held_lock+0x35/0x130 [ 70.278338][ T8988] ? tomoyo_path_number_perm+0x214/0x520 [ 70.278346][ T8988] ? lock_downgrade+0x920/0x920 [ 70.278352][ T8988] ? lockdep_hardirqs_on+0x421/0x5e0 [ 70.278360][ T8988] ? tomoyo_path_number_perm+0x454/0x520 [ 70.278374][ T8988] fb_ioctl+0xe6/0x130 [ 70.278380][ T8988] ? do_fb_ioctl+0x7d0/0x7d0 [ 70.278386][ T8988] do_vfs_ioctl+0xdb6/0x13e0 [ 70.278394][ T8988] ? compat_ioctl_preallocate+0x210/0x210 [ 70.278401][ T8988] ? kmem_cache_free+0x26b/0x320 [ 70.278409][ T8988] ? putname+0xf4/0x130 [ 70.278415][ T8988] ? do_sys_open+0x31d/0x5d0 [ 70.278423][ T8988] ? tomoyo_file_ioctl+0x23/0x30 [ 70.278431][ T8988] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 70.278437][ T8988] ? security_file_ioctl+0x8d/0xc0 [ 70.278444][ T8988] ksys_ioctl+0xab/0xd0 [ 70.278451][ T8988] __x64_sys_ioctl+0x73/0xb0 [ 70.278459][ T8988] do_syscall_64+0xfa/0x790 [ 70.278468][ T8988] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.278473][ T8988] RIP: 0033:0x440309 [ 70.278479][ T8988] 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 [ 70.278483][ T8988] RSP: 002b:00007ffe5b970878 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 70.278489][ T8988] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 70.278493][ T8988] RDX: 0000000020000100 RSI: 0000000000004601 RDI: 0000000000000003 [ 70.278498][ T8988] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 70.278502][ T8988] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 70.278506][ T8988] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 70.279586][ T8988] Kernel Offset: disabled [ 71.141087][ T8988] Rebooting in 86400 seconds..