[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.653507][ T27] audit: type=1800 audit(1576508157.137:25): pid=8824 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.674095][ T27] audit: type=1800 audit(1576508157.137:26): pid=8824 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.734784][ T27] audit: type=1800 audit(1576508157.147:27): pid=8824 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 '10.128.0.199' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.816152][ T8979] ================================================================== [ 68.816194][ T8979] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 68.816201][ T8979] Read of size 2 at addr ffffffff8875111e by task syz-executor340/8979 [ 68.816204][ T8979] [ 68.816214][ T8979] CPU: 1 PID: 8979 Comm: syz-executor340 Not tainted 5.5.0-rc1-syzkaller #0 [ 68.816219][ T8979] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.816222][ T8979] Call Trace: [ 68.816234][ T8979] dump_stack+0x197/0x210 [ 68.816241][ T8979] ? vga16fb_imageblit+0x1c8b/0x2200 [ 68.816253][ T8979] print_address_description.constprop.0.cold+0x5/0x30b [ 68.816260][ T8979] ? vga16fb_imageblit+0x1c8b/0x2200 [ 68.816267][ T8979] ? vga16fb_imageblit+0x1c8b/0x2200 [ 68.816275][ T8979] __kasan_report.cold+0x1b/0x41 [ 68.816284][ T8979] ? vga16fb_imageblit+0x1c8b/0x2200 [ 68.816292][ T8979] kasan_report+0x12/0x20 [ 68.816301][ T8979] __asan_report_load2_noabort+0x14/0x20 [ 68.816308][ T8979] vga16fb_imageblit+0x1c8b/0x2200 [ 68.816316][ T8979] ? mark_lock+0xdf/0x1220 [ 68.816330][ T8979] soft_cursor+0x4fb/0xa30 [ 68.816338][ T8979] ? lockdep_hardirqs_on+0x421/0x5e0 [ 68.816351][ T8979] bit_cursor+0x12fc/0x1a60 [ 68.816363][ T8979] ? bit_clear+0x530/0x530 [ 68.816371][ T8979] ? fbcon_putcs+0x33c/0x3e0 [ 68.816378][ T8979] ? fbcon_putcs+0x343/0x3e0 [ 68.816396][ T8979] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 68.816405][ T8979] ? get_color+0x225/0x430 [ 68.816414][ T8979] fbcon_cursor+0x487/0x660 [ 68.816420][ T8979] ? bit_clear+0x530/0x530 [ 68.816431][ T8979] set_cursor+0x1fb/0x280 [ 68.816440][ T8979] redraw_screen+0x4e1/0x7d0 [ 68.816447][ T8979] ? efifb_probe.cold+0x181f/0x181f [ 68.816456][ T8979] ? respond_string+0x2c0/0x2c0 [ 68.816466][ T8979] ? fbcon_set_palette+0x3c4/0x4a0 [ 68.816477][ T8979] fbcon_modechanged+0x5c3/0x790 [ 68.816489][ T8979] fbcon_update_vcs+0x42/0x50 [ 68.816496][ T8979] fb_set_var+0xb32/0xdd0 [ 68.816505][ T8979] ? fb_blank+0x1a0/0x1a0 [ 68.816513][ T8979] ? lock_acquire+0x190/0x410 [ 68.816526][ T8979] ? __mutex_lock+0x458/0x13c0 [ 68.816533][ T8979] ? down+0x50/0x90 [ 68.816553][ T8979] ? do_fb_ioctl+0x335/0x7d0 [ 68.816565][ T8979] do_fb_ioctl+0x390/0x7d0 [ 68.816573][ T8979] ? fb_mmap+0x520/0x520 [ 68.816582][ T8979] ? tomoyo_path_number_perm+0x214/0x520 [ 68.816590][ T8979] ? find_held_lock+0x35/0x130 [ 68.816598][ T8979] ? tomoyo_path_number_perm+0x214/0x520 [ 68.816609][ T8979] ? lock_downgrade+0x920/0x920 [ 68.816616][ T8979] ? lockdep_hardirqs_on+0x421/0x5e0 [ 68.816626][ T8979] ? tomoyo_path_number_perm+0x454/0x520 [ 68.816649][ T8979] fb_ioctl+0xe6/0x130 [ 68.816656][ T8979] ? do_fb_ioctl+0x7d0/0x7d0 [ 68.816666][ T8979] do_vfs_ioctl+0x977/0x14e0 [ 68.816676][ T8979] ? compat_ioctl_preallocate+0x220/0x220 [ 68.816685][ T8979] ? kmem_cache_free+0x26b/0x320 [ 68.816695][ T8979] ? putname+0xf4/0x130 [ 68.816704][ T8979] ? do_sys_open+0x31d/0x5d0 [ 68.816715][ T8979] ? tomoyo_file_ioctl+0x23/0x30 [ 68.816723][ T8979] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.816731][ T8979] ? security_file_ioctl+0x8d/0xc0 [ 68.816740][ T8979] ksys_ioctl+0xab/0xd0 [ 68.816749][ T8979] __x64_sys_ioctl+0x73/0xb0 [ 68.816760][ T8979] do_syscall_64+0xfa/0x790 [ 68.816770][ T8979] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.816777][ T8979] RIP: 0033:0x440309 [ 68.816787][ T8979] 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 [ 68.816791][ T8979] RSP: 002b:00007ffeb7f14dd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 68.816799][ T8979] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 68.816804][ T8979] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 68.816809][ T8979] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 68.816813][ T8979] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 68.816818][ T8979] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 68.816828][ T8979] [ 68.816831][ T8979] The buggy address belongs to the variable: [ 68.816840][ T8979] transl_h+0x3e/0x40 [ 68.816842][ T8979] [ 68.816844][ T8979] Memory state around the buggy address: [ 68.816852][ T8979] ffffffff88751000: 00 00 00 00 fa fa fa fa 00 00 00 00 00 fa fa fa [ 68.816858][ T8979] ffffffff88751080: fa fa fa fa 04 fa fa fa fa fa fa fa 00 00 00 00 [ 68.816864][ T8979] >ffffffff88751100: fa fa fa fa 00 00 00 00 fa fa fa fa 00 01 fa fa [ 68.816867][ T8979] ^ [ 68.816872][ T8979] ffffffff88751180: fa fa fa fa 00 00 00 04 fa fa fa fa 00 00 04 fa [ 68.816878][ T8979] ffffffff88751200: fa fa fa fa 00 00 00 00 00 00 02 fa fa fa fa fa [ 68.816887][ T8979] ================================================================== [ 68.816890][ T8979] Disabling lock debugging due to kernel taint [ 68.816895][ T8979] Kernel panic - not syncing: panic_on_warn set ... [ 68.816903][ T8979] CPU: 1 PID: 8979 Comm: syz-executor340 Tainted: G B 5.5.0-rc1-syzkaller #0 [ 68.816907][ T8979] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.816908][ T8979] Call Trace: [ 68.816916][ T8979] dump_stack+0x197/0x210 [ 68.816925][ T8979] panic+0x2e3/0x75c [ 68.816932][ T8979] ? add_taint.cold+0x16/0x16 [ 68.816942][ T8979] ? trace_hardirqs_on+0x67/0x240 [ 68.816949][ T8979] ? trace_hardirqs_on+0x5e/0x240 [ 68.816957][ T8979] ? vga16fb_imageblit+0x1c8b/0x2200 [ 68.816963][ T8979] end_report+0x47/0x4f [ 68.816969][ T8979] ? vga16fb_imageblit+0x1c8b/0x2200 [ 68.816975][ T8979] __kasan_report.cold+0xe/0x41 [ 68.816982][ T8979] ? vga16fb_imageblit+0x1c8b/0x2200 [ 68.816989][ T8979] kasan_report+0x12/0x20 [ 68.816997][ T8979] __asan_report_load2_noabort+0x14/0x20 [ 68.817003][ T8979] vga16fb_imageblit+0x1c8b/0x2200 [ 68.817009][ T8979] ? mark_lock+0xdf/0x1220 [ 68.817018][ T8979] soft_cursor+0x4fb/0xa30 [ 68.817024][ T8979] ? lockdep_hardirqs_on+0x421/0x5e0 [ 68.817033][ T8979] bit_cursor+0x12fc/0x1a60 [ 68.817041][ T8979] ? bit_clear+0x530/0x530 [ 68.817048][ T8979] ? fbcon_putcs+0x33c/0x3e0 [ 68.817055][ T8979] ? fbcon_putcs+0x343/0x3e0 [ 68.817065][ T8979] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 68.817072][ T8979] ? get_color+0x225/0x430 [ 68.817079][ T8979] fbcon_cursor+0x487/0x660 [ 68.817085][ T8979] ? bit_clear+0x530/0x530 [ 68.817092][ T8979] set_cursor+0x1fb/0x280 [ 68.817099][ T8979] redraw_screen+0x4e1/0x7d0 [ 68.817105][ T8979] ? efifb_probe.cold+0x181f/0x181f [ 68.817113][ T8979] ? respond_string+0x2c0/0x2c0 [ 68.817121][ T8979] ? fbcon_set_palette+0x3c4/0x4a0 [ 68.817129][ T8979] fbcon_modechanged+0x5c3/0x790 [ 68.817138][ T8979] fbcon_update_vcs+0x42/0x50 [ 68.817145][ T8979] fb_set_var+0xb32/0xdd0 [ 68.817152][ T8979] ? fb_blank+0x1a0/0x1a0 [ 68.817158][ T8979] ? lock_acquire+0x190/0x410 [ 68.817167][ T8979] ? __mutex_lock+0x458/0x13c0 [ 68.817173][ T8979] ? down+0x50/0x90 [ 68.817185][ T8979] ? do_fb_ioctl+0x335/0x7d0 [ 68.817194][ T8979] do_fb_ioctl+0x390/0x7d0 [ 68.817200][ T8979] ? fb_mmap+0x520/0x520 [ 68.817207][ T8979] ? tomoyo_path_number_perm+0x214/0x520 [ 68.817213][ T8979] ? find_held_lock+0x35/0x130 [ 68.817220][ T8979] ? tomoyo_path_number_perm+0x214/0x520 [ 68.817228][ T8979] ? lock_downgrade+0x920/0x920 [ 68.817234][ T8979] ? lockdep_hardirqs_on+0x421/0x5e0 [ 68.817242][ T8979] ? tomoyo_path_number_perm+0x454/0x520 [ 68.817256][ T8979] fb_ioctl+0xe6/0x130 [ 68.817262][ T8979] ? do_fb_ioctl+0x7d0/0x7d0 [ 68.817269][ T8979] do_vfs_ioctl+0x977/0x14e0 [ 68.817277][ T8979] ? compat_ioctl_preallocate+0x220/0x220 [ 68.817283][ T8979] ? kmem_cache_free+0x26b/0x320 [ 68.817291][ T8979] ? putname+0xf4/0x130 [ 68.817297][ T8979] ? do_sys_open+0x31d/0x5d0 [ 68.817305][ T8979] ? tomoyo_file_ioctl+0x23/0x30 [ 68.817313][ T8979] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.817319][ T8979] ? security_file_ioctl+0x8d/0xc0 [ 68.817326][ T8979] ksys_ioctl+0xab/0xd0 [ 68.817333][ T8979] __x64_sys_ioctl+0x73/0xb0 [ 68.817341][ T8979] do_syscall_64+0xfa/0x790 [ 68.817349][ T8979] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.817354][ T8979] RIP: 0033:0x440309 [ 68.817360][ T8979] 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 [ 68.817364][ T8979] RSP: 002b:00007ffeb7f14dd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 68.817370][ T8979] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 68.817374][ T8979] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 68.817378][ T8979] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 68.817384][ T8979] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 68.817389][ T8979] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 68.819142][ T8979] Kernel Offset: disabled [ 69.684474][ T8979] Rebooting in 86400 seconds..