[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.23' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.366764][ T8477] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 69.366776][ T8477] #PF: supervisor instruction fetch in kernel mode [ 69.366783][ T8477] #PF: error_code(0x0010) - not-present page [ 69.366791][ T8477] PGD 1b68f067 P4D 1b68f067 PUD 17660067 PMD 0 [ 69.366813][ T8477] Oops: 0010 [#1] PREEMPT SMP KASAN [ 69.366825][ T8477] CPU: 0 PID: 8477 Comm: syz-executor298 Not tainted 5.11.0-rc3-syzkaller #0 [ 69.366838][ T8477] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.366845][ T8477] RIP: 0010:0x0 [ 69.366858][ T8477] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. [ 69.366864][ T8477] RSP: 0018:ffffc90000fdf850 EFLAGS: 00010292 [ 69.366875][ T8477] RAX: 0000000000000007 RBX: 0000000000000000 RCX: 0000000000000007 [ 69.366884][ T8477] RDX: 0000000000000002 RSI: ffff888143eeb000 RDI: ffff888010071000 [ 69.366892][ T8477] RBP: ffff888010071000 R08: 0000000000000000 R09: ffffffff83ec7d6a [ 69.366900][ T8477] R10: 0000000000000003 R11: 0000000000000018 R12: ffff888143eeb000 [ 69.366909][ T8477] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000720 [ 69.366917][ T8477] FS: 0000000001b8c880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 69.366932][ T8477] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.366941][ T8477] CR2: ffffffffffffffd6 CR3: 000000001cba1000 CR4: 00000000001506f0 [ 69.366949][ T8477] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.366957][ T8477] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.366965][ T8477] Call Trace: [ 69.366970][ T8477] fbcon_cursor+0x50e/0x620 [ 69.366998][ T8477] hide_cursor+0x85/0x280 [ 69.367015][ T8477] redraw_screen+0x5ed/0x790 [ 69.367029][ T8477] ? wait_for_completion_io+0x260/0x260 [ 69.367047][ T8477] ? vc_init+0x5a0/0x5a0 [ 69.367062][ T8477] vc_do_resize+0xed8/0x1150 [ 69.367079][ T8477] ? unblank_screen+0x10/0x10 [ 69.367094][ T8477] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 69.367112][ T8477] fbcon_set_disp+0x7a8/0xe10 [ 69.367126][ T8477] set_con2fb_map+0x7a6/0xf80 [ 69.367138][ T8477] ? drm_fb_helper_blank+0x250/0x250 [ 69.367160][ T8477] fbcon_set_con2fb_map_ioctl+0x165/0x220 [ 69.367174][ T8477] ? fbcon_get_requirement+0x7a0/0x7a0 [ 69.367188][ T8477] ? __sanitizer_cov_trace_switch+0x63/0xf0 [ 69.367204][ T8477] do_fb_ioctl+0x5b6/0x690 [ 69.367219][ T8477] ? fb_getput_cmap+0x270/0x270 [ 69.367233][ T8477] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 69.367249][ T8477] ? lockdep_hardirqs_on+0x79/0x100 [ 69.367264][ T8477] ? putname+0xe1/0x120 [ 69.367280][ T8477] ? __sanitizer_cov_trace_switch+0x63/0xf0 [ 69.367295][ T8477] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 69.367310][ T8477] ? do_vfs_ioctl+0x27d/0x1090 [ 69.367324][ T8477] ? generic_block_fiemap+0x60/0x60 [ 69.367337][ T8477] ? build_open_flags+0x680/0x680 [ 69.367351][ T8477] ? _down_write_nest_lock+0x150/0x150 [ 69.367367][ T8477] ? __x64_sys_openat+0x13f/0x1f0 [ 69.367381][ T8477] fb_ioctl+0xe7/0x150 [ 69.367394][ T8477] ? do_fb_ioctl+0x690/0x690 [ 69.367408][ T8477] __x64_sys_ioctl+0x193/0x200 [ 69.367421][ T8477] do_syscall_64+0x2d/0x70 [ 69.367433][ T8477] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 69.367448][ T8477] RIP: 0033:0x4402b9 [ 69.367457][ T8477] 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 69.367470][ T8477] RSP: 002b:00007ffc446d43e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 69.367483][ T8477] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402b9 [ 69.367491][ T8477] RDX: 0000000020000040 RSI: 0000000000004610 RDI: 0000000000000004 [ 69.367499][ T8477] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 69.367507][ T8477] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401ac0 [ 69.367515][ T8477] R13: 0000000000401b50 R14: 0000000000000000 R15: 0000000000000000 [ 69.367526][ T8477] Modules linked in: [ 69.367533][ T8477] CR2: 0000000000000000 [ 69.367543][ T8477] ---[ end trace bb22704308b3ceab ]--- [ 69.367549][ T8477] RIP: 0010:0x0 [ 69.367560][ T8477] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. [ 69.367566][ T8477] RSP: 0018:ffffc90000fdf850 EFLAGS: 00010292 [ 69.367577][ T8477] RAX: 0000000000000007 RBX: 0000000000000000 RCX: 0000000000000007 [ 69.367585][ T8477] RDX: 0000000000000002 RSI: ffff888143eeb000 RDI: ffff888010071000 [ 69.367594][ T8477] RBP: ffff888010071000 R08: 0000000000000000 R09: ffffffff83ec7d6a [ 69.367602][ T8477] R10: 0000000000000003 R11: 0000000000000018 R12: ffff888143eeb000 [ 69.367611][ T8477] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000720 [ 69.367619][ T8477] FS: 0000000001b8c880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 69.367633][ T8477] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.367643][ T8477] CR2: ffffffffffffffd6 CR3: 000000001cba1000 CR4: 00000000001506f0 [ 69.367652][ T8477] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.367659][ T8477] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.367669][ T8477] Kernel panic - not syncing: Fatal exception [ 69.368217][ T8477] Kernel Offset: disabled [ 69.865745][ T8477] Rebooting in 86400 seconds..