[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 72.202504][ T27] audit: type=1800 audit(1577398175.923:25): pid=9195 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 72.223811][ T27] audit: type=1800 audit(1577398175.923:26): pid=9195 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 72.273685][ T27] audit: type=1800 audit(1577398175.923:27): pid=9195 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 '10.128.0.41' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 82.313335][ T9347] ================================================================== [ 82.313378][ T9347] BUG: KASAN: global-out-of-bounds in vga16fb_imageblit+0x1c8b/0x2200 [ 82.313386][ T9347] Read of size 2 at addr ffffffff88752b9e by task syz-executor599/9347 [ 82.313388][ T9347] [ 82.313399][ T9347] CPU: 1 PID: 9347 Comm: syz-executor599 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 82.313406][ T9347] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.313409][ T9347] Call Trace: [ 82.313420][ T9347] dump_stack+0x197/0x210 [ 82.313429][ T9347] ? vga16fb_imageblit+0x1c8b/0x2200 [ 82.313442][ T9347] print_address_description.constprop.0.cold+0x5/0x30b [ 82.313450][ T9347] ? vga16fb_imageblit+0x1c8b/0x2200 [ 82.313459][ T9347] ? vga16fb_imageblit+0x1c8b/0x2200 [ 82.313468][ T9347] __kasan_report.cold+0x1b/0x41 [ 82.313478][ T9347] ? vga16fb_imageblit+0x1c8b/0x2200 [ 82.313488][ T9347] kasan_report+0x12/0x20 [ 82.313497][ T9347] __asan_report_load2_noabort+0x14/0x20 [ 82.313506][ T9347] vga16fb_imageblit+0x1c8b/0x2200 [ 82.313515][ T9347] ? mark_lock+0x11f/0x1220 [ 82.313531][ T9347] soft_cursor+0x4fb/0xa30 [ 82.313539][ T9347] ? lockdep_hardirqs_on+0x421/0x5e0 [ 82.313553][ T9347] bit_cursor+0x12fc/0x1a60 [ 82.313567][ T9347] ? bit_clear+0x530/0x530 [ 82.313575][ T9347] ? fbcon_putcs+0x33c/0x3e0 [ 82.313582][ T9347] ? fbcon_putcs+0x343/0x3e0 [ 82.313598][ T9347] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 82.313607][ T9347] ? get_color+0x225/0x430 [ 82.313617][ T9347] fbcon_cursor+0x487/0x660 [ 82.313625][ T9347] ? bit_clear+0x530/0x530 [ 82.313636][ T9347] set_cursor+0x1fb/0x280 [ 82.313645][ T9347] redraw_screen+0x4e1/0x7d0 [ 82.313653][ T9347] ? efifb_probe.cold+0x181f/0x181f [ 82.313662][ T9347] ? respond_string+0x2c0/0x2c0 [ 82.313672][ T9347] ? fbcon_set_palette+0x3c4/0x4a0 [ 82.313682][ T9347] fbcon_modechanged+0x5c3/0x790 [ 82.313694][ T9347] fbcon_update_vcs+0x42/0x50 [ 82.313704][ T9347] fb_set_var+0xb32/0xdd0 [ 82.313715][ T9347] ? fb_blank+0x1a0/0x1a0 [ 82.313723][ T9347] ? lock_acquire+0x190/0x410 [ 82.313738][ T9347] ? __mutex_lock+0x458/0x13c0 [ 82.313746][ T9347] ? down+0x50/0x90 [ 82.313767][ T9347] ? do_fb_ioctl+0x335/0x7d0 [ 82.313781][ T9347] do_fb_ioctl+0x390/0x7d0 [ 82.313791][ T9347] ? fb_mmap+0x560/0x560 [ 82.313806][ T9347] ? trace_hardirqs_on+0x67/0x240 [ 82.313819][ T9347] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 82.313828][ T9347] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 82.313837][ T9347] ? do_vfs_ioctl+0x11b/0x1340 [ 82.313862][ T9347] fb_ioctl+0xe6/0x130 [ 82.313870][ T9347] ? do_fb_ioctl+0x7d0/0x7d0 [ 82.313879][ T9347] ksys_ioctl+0x123/0x180 [ 82.313889][ T9347] __x64_sys_ioctl+0x73/0xb0 [ 82.313900][ T9347] do_syscall_64+0xfa/0x790 [ 82.313910][ T9347] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 82.313917][ T9347] RIP: 0033:0x440309 [ 82.313927][ T9347] 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 [ 82.313932][ T9347] RSP: 002b:00007ffd4b028958 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 82.313945][ T9347] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 82.313950][ T9347] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 82.313955][ T9347] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 82.313960][ T9347] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 82.313964][ T9347] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 82.313975][ T9347] [ 82.313978][ T9347] The buggy address belongs to the variable: [ 82.313986][ T9347] transl_h+0x3e/0x40 [ 82.313989][ T9347] [ 82.313991][ T9347] Memory state around the buggy address: [ 82.313999][ T9347] ffffffff88752a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 82.314005][ T9347] ffffffff88752b00: 00 00 00 00 00 00 00 fa fa fa fa fa 00 00 00 00 [ 82.314011][ T9347] >ffffffff88752b80: fa fa fa fa 00 00 00 00 fa fa fa fa 00 01 fa fa [ 82.314015][ T9347] ^ [ 82.314021][ T9347] ffffffff88752c00: fa fa fa fa 00 00 00 04 fa fa fa fa 00 00 04 fa [ 82.314027][ T9347] ffffffff88752c80: fa fa fa fa 00 00 00 00 00 00 02 fa fa fa fa fa [ 82.314030][ T9347] ================================================================== [ 82.314033][ T9347] Disabling lock debugging due to kernel taint [ 82.314038][ T9347] Kernel panic - not syncing: panic_on_warn set ... [ 82.314046][ T9347] CPU: 1 PID: 9347 Comm: syz-executor599 Tainted: G B 5.5.0-rc2-next-20191220-syzkaller #0 [ 82.314050][ T9347] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.314052][ T9347] Call Trace: [ 82.314059][ T9347] dump_stack+0x197/0x210 [ 82.314070][ T9347] panic+0x2e3/0x75c [ 82.314078][ T9347] ? add_taint.cold+0x16/0x16 [ 82.314088][ T9347] ? trace_hardirqs_on+0x67/0x240 [ 82.314096][ T9347] ? trace_hardirqs_on+0x5e/0x240 [ 82.314104][ T9347] ? vga16fb_imageblit+0x1c8b/0x2200 [ 82.314112][ T9347] end_report+0x47/0x4f [ 82.314119][ T9347] ? vga16fb_imageblit+0x1c8b/0x2200 [ 82.314127][ T9347] __kasan_report.cold+0xe/0x41 [ 82.314135][ T9347] ? vga16fb_imageblit+0x1c8b/0x2200 [ 82.314143][ T9347] kasan_report+0x12/0x20 [ 82.314151][ T9347] __asan_report_load2_noabort+0x14/0x20 [ 82.314159][ T9347] vga16fb_imageblit+0x1c8b/0x2200 [ 82.314166][ T9347] ? mark_lock+0x11f/0x1220 [ 82.314176][ T9347] soft_cursor+0x4fb/0xa30 [ 82.314183][ T9347] ? lockdep_hardirqs_on+0x421/0x5e0 [ 82.314194][ T9347] bit_cursor+0x12fc/0x1a60 [ 82.314204][ T9347] ? bit_clear+0x530/0x530 [ 82.314210][ T9347] ? fbcon_putcs+0x33c/0x3e0 [ 82.314217][ T9347] ? fbcon_putcs+0x343/0x3e0 [ 82.314228][ T9347] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 82.314235][ T9347] ? get_color+0x225/0x430 [ 82.314244][ T9347] fbcon_cursor+0x487/0x660 [ 82.314253][ T9347] ? bit_clear+0x530/0x530 [ 82.314260][ T9347] set_cursor+0x1fb/0x280 [ 82.314268][ T9347] redraw_screen+0x4e1/0x7d0 [ 82.314275][ T9347] ? efifb_probe.cold+0x181f/0x181f [ 82.314282][ T9347] ? respond_string+0x2c0/0x2c0 [ 82.314291][ T9347] ? fbcon_set_palette+0x3c4/0x4a0 [ 82.314299][ T9347] fbcon_modechanged+0x5c3/0x790 [ 82.314308][ T9347] fbcon_update_vcs+0x42/0x50 [ 82.314317][ T9347] fb_set_var+0xb32/0xdd0 [ 82.314327][ T9347] ? fb_blank+0x1a0/0x1a0 [ 82.314334][ T9347] ? lock_acquire+0x190/0x410 [ 82.314344][ T9347] ? __mutex_lock+0x458/0x13c0 [ 82.314351][ T9347] ? down+0x50/0x90 [ 82.314368][ T9347] ? do_fb_ioctl+0x335/0x7d0 [ 82.314378][ T9347] do_fb_ioctl+0x390/0x7d0 [ 82.314387][ T9347] ? fb_mmap+0x560/0x560 [ 82.314397][ T9347] ? trace_hardirqs_on+0x67/0x240 [ 82.314407][ T9347] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 82.314416][ T9347] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 82.314423][ T9347] ? do_vfs_ioctl+0x11b/0x1340 [ 82.314438][ T9347] fb_ioctl+0xe6/0x130 [ 82.314446][ T9347] ? do_fb_ioctl+0x7d0/0x7d0 [ 82.314453][ T9347] ksys_ioctl+0x123/0x180 [ 82.314461][ T9347] __x64_sys_ioctl+0x73/0xb0 [ 82.314470][ T9347] do_syscall_64+0xfa/0x790 [ 82.314478][ T9347] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 82.314483][ T9347] RIP: 0033:0x440309 [ 82.314490][ T9347] 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 [ 82.314494][ T9347] RSP: 002b:00007ffd4b028958 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 82.314500][ T9347] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 82.314505][ T9347] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 82.314509][ T9347] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 82.314513][ T9347] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90 [ 82.314517][ T9347] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 82.316036][ T9347] Kernel Offset: disabled [ 83.086045][ T9347] Rebooting in 86400 seconds..