[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.143' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.302851][ T8458] BUG: unable to handle page fault for address: ffff888001000050 [ 73.302867][ T8458] #PF: supervisor write access in kernel mode [ 73.302875][ T8458] #PF: error_code(0x0003) - permissions violation [ 73.302883][ T8458] PGD 10601067 P4D 10601067 PUD 10602067 PMD 80000000010001e1 [ 73.302904][ T8458] Oops: 0003 [#1] PREEMPT SMP KASAN [ 73.302916][ T8458] CPU: 1 PID: 8458 Comm: syz-executor826 Not tainted 5.14.0-rc6-syzkaller #0 [ 73.302930][ T8458] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.302937][ T8458] RIP: 0010:vga16fb_fillrect+0x993/0x18d0 [ 73.302963][ T8458] Code: 68 fd 48 63 44 24 10 45 31 f6 48 89 04 24 e8 04 69 68 fd 31 ff 89 de 31 ed e8 39 70 68 fd 85 db 4d 89 ec 74 22 e8 ed 68 68 fd <45> 88 34 24 83 c5 01 89 df 49 83 c4 01 89 ee e8 09 71 68 fd 39 eb [ 73.302975][ T8458] RSP: 0018:ffffc9000172f848 EFLAGS: 00010293 [ 73.302987][ T8458] RAX: 0000000000000000 RBX: 000000000000001b RCX: 0000000000000000 [ 73.302995][ T8458] RDX: ffff88802cf6d4c0 RSI: ffffffff840d4013 RDI: 0000000000000003 [ 73.303004][ T8458] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff840d399d [ 73.303012][ T8458] R10: ffffffff840d4007 R11: 0000000000000000 R12: ffff888001000050 [ 73.303021][ T8458] R13: ffff888001000050 R14: 0000000000000000 R15: 000000000ffeb7ff [ 73.303030][ T8458] FS: 0000000000b04300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 73.303043][ T8458] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 73.303052][ T8458] CR2: ffff888001000050 CR3: 0000000020439000 CR4: 00000000001506e0 [ 73.303061][ T8458] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 73.303068][ T8458] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 73.303076][ T8458] Call Trace: [ 73.303083][ T8458] ? memcpy+0x39/0x60 [ 73.303101][ T8458] bit_clear_margins+0x3f6/0x4b0 [ 73.303118][ T8458] ? bit_bmove+0x210/0x210 [ 73.303135][ T8458] fbcon_clear_margins+0x1f1/0x280 [ 73.303150][ T8458] fbcon_switch+0xa8c/0x1620 [ 73.303166][ T8458] ? fbcon_deinit+0xe80/0xe80 [ 73.303183][ T8458] ? bit_putcs+0xd20/0xd20 [ 73.303197][ T8458] ? fbcon_cursor+0x51d/0x630 [ 73.303212][ T8458] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.303227][ T8458] ? con_is_visible+0x61/0x140 [ 73.303243][ T8458] redraw_screen+0x2b9/0x740 [ 73.303256][ T8458] ? vga16fb_update_fix+0x4a0/0x4a0 [ 73.303271][ T8458] ? csi_J+0xab0/0xab0 [ 73.303285][ T8458] ? fbcon_set_palette+0x462/0x630 [ 73.303300][ T8458] fbcon_modechanged+0x593/0x6d0 [ 73.303316][ T8458] fbcon_update_vcs+0x3a/0x50 [ 73.303330][ T8458] do_fb_ioctl+0x62e/0x690 [ 73.303343][ T8458] ? fb_getput_cmap+0x270/0x270 [ 73.303356][ T8458] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 73.303371][ T8458] ? __lock_acquire+0x162f/0x54a0 [ 73.303386][ T8458] ? __sanitizer_cov_trace_switch+0x63/0xf0 [ 73.303399][ T8458] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 73.303414][ T8458] ? do_vfs_ioctl+0x132/0x15d0 [ 73.303429][ T8458] ? vfs_fileattr_set+0xb50/0xb50 [ 73.303448][ T8458] ? lock_downgrade+0x6e0/0x6e0 [ 73.303462][ T8458] fb_ioctl+0xe7/0x150 [ 73.303474][ T8458] ? do_fb_ioctl+0x690/0x690 [ 73.303486][ T8458] __x64_sys_ioctl+0x193/0x200 [ 73.303501][ T8458] do_syscall_64+0x35/0xb0 [ 73.303521][ T8458] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 73.303536][ T8458] RIP: 0033:0x43efd9 [ 73.303547][ T8458] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 73.303559][ T8458] RSP: 002b:00007fff35bd6098 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 73.303572][ T8458] RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043efd9 [ 73.303580][ T8458] RDX: 0000000020000200 RSI: 0000000000004601 RDI: 0000000000000003 [ 73.303588][ T8458] RBP: 0000000000402fc0 R08: 0000000000000000 R09: 0000000000400488 [ 73.303596][ T8458] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403050 [ 73.303605][ T8458] R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488 [ 73.303616][ T8458] Modules linked in: [ 73.303623][ T8458] CR2: ffff888001000050 [ 73.303632][ T8458] ---[ end trace e56988c1407c1ce2 ]--- [ 73.303637][ T8458] RIP: 0010:vga16fb_fillrect+0x993/0x18d0 [ 73.303657][ T8458] Code: 68 fd 48 63 44 24 10 45 31 f6 48 89 04 24 e8 04 69 68 fd 31 ff 89 de 31 ed e8 39 70 68 fd 85 db 4d 89 ec 74 22 e8 ed 68 68 fd <45> 88 34 24 83 c5 01 89 df 49 83 c4 01 89 ee e8 09 71 68 fd 39 eb [ 73.303668][ T8458] RSP: 0018:ffffc9000172f848 EFLAGS: 00010293 [ 73.303678][ T8458] RAX: 0000000000000000 RBX: 000000000000001b RCX: 0000000000000000 [ 73.303686][ T8458] RDX: ffff88802cf6d4c0 RSI: ffffffff840d4013 RDI: 0000000000000003 [ 73.303695][ T8458] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff840d399d [ 73.303703][ T8458] R10: ffffffff840d4007 R11: 0000000000000000 R12: ffff888001000050 [ 73.303711][ T8458] R13: ffff888001000050 R14: 0000000000000000 R15: 000000000ffeb7ff [ 73.303720][ T8458] FS: 0000000000b04300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 73.303732][ T8458] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 73.303741][ T8458] CR2: ffff888001000050 CR3: 0000000020439000 CR4: 00000000001506e0 [ 73.303750][ T8458] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 73.303757][ T8458] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 73.303766][ T8458] Kernel panic - not syncing: Fatal exception [ 73.305150][ T8458] Kernel Offset: disabled [ 73.830900][ T8458] Rebooting in 86400 seconds..