[ 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 '10.128.0.154' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 56.088549][ T6804] general protection fault, probably for non-canonical address 0xdffffc0020000001: 0000 [#1] PREEMPT SMP KASAN [ 56.088559][ T6804] KASAN: probably user-memory-access in range [0x0000000100000008-0x000000010000000f] [ 56.088571][ T6804] CPU: 0 PID: 6804 Comm: syz-executor443 Not tainted 5.8.0-rc3-next-20200703-syzkaller #0 [ 56.088577][ T6804] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.088593][ T6804] RIP: 0010:do_con_write+0x8dd/0x1d70 [ 56.088604][ T6804] Code: 89 0f 84 fd 48 8b 44 24 18 0b 5c 24 74 80 38 00 0f 85 f4 10 00 00 4d 8b a6 08 04 00 00 4c 89 e0 4c 89 e2 48 c1 e8 03 83 e2 07 <0f> b6 0c 28 83 c2 01 38 ca 7c 08 84 c9 0f 85 c0 10 00 00 66 41 89 [ 56.088610][ T6804] RSP: 0018:ffffc90000f87a68 EFLAGS: 00010202 [ 56.088619][ T6804] RAX: 0000000020000001 RBX: 00000000000007fe RCX: ffffffff83eff73c [ 56.088626][ T6804] RDX: 0000000000000004 RSI: ffffffff83eff777 RDI: 0000000000000003 [ 56.088633][ T6804] RBP: dffffc0000000000 R08: ffffffff83eeaad0 R09: ffff88808e4beb10 [ 56.088639][ T6804] R10: 0000000000000000 R11: 0000000000000000 R12: 000000010000000c [ 56.088644][ T6804] R13: 0000000000000001 R14: ffff888099bfe000 R15: 0000000000000000 [ 56.088653][ T6804] FS: 00000000006eb880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 56.088660][ T6804] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.088667][ T6804] CR2: 00000000004553a0 CR3: 000000009e3b2000 CR4: 00000000001506f0 [ 56.088678][ T6804] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 56.088684][ T6804] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 56.088687][ T6804] Call Trace: [ 56.088707][ T6804] ? do_con_trol+0x51e0/0x51e0 [ 56.088722][ T6804] ? mark_held_locks+0x9f/0xe0 [ 56.088736][ T6804] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 56.088748][ T6804] con_write+0x22/0xb0 [ 56.088761][ T6804] n_tty_write+0x3ce/0xf80 [ 56.088779][ T6804] ? n_tty_receive_char_lnext+0x700/0x700 [ 56.088793][ T6804] ? __init_waitqueue_head+0x110/0x110 [ 56.088805][ T6804] ? __might_fault+0x190/0x1d0 [ 56.088818][ T6804] tty_write+0x4d9/0x870 [ 56.088830][ T6804] ? n_tty_receive_char_lnext+0x700/0x700 [ 56.088842][ T6804] ? tty_read+0x290/0x290 [ 56.088853][ T6804] __vfs_write+0x76/0x100 [ 56.088864][ T6804] vfs_write+0x268/0x5d0 [ 56.088877][ T6804] ksys_write+0x12d/0x250 [ 56.088888][ T6804] ? __ia32_sys_read+0xb0/0xb0 [ 56.088899][ T6804] ? lock_is_held_type+0xb0/0xe0 [ 56.088909][ T6804] ? do_syscall_64+0x1c/0xe0 [ 56.088921][ T6804] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 56.088932][ T6804] do_syscall_64+0x60/0xe0 [ 56.088945][ T6804] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.088953][ T6804] RIP: 0033:0x440459 [ 56.088956][ T6804] Code: Bad RIP value. [ 56.088962][ T6804] RSP: 002b:00007ffd189b3b58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 56.088972][ T6804] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440459 [ 56.088978][ T6804] RDX: 0000000000001006 RSI: 0000000020000240 RDI: 0000000000000004 [ 56.088985][ T6804] RBP: 00000000006cb018 R08: 000000000000000e R09: 00000000004002c8 [ 56.088991][ T6804] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401d40 [ 56.088997][ T6804] R13: 0000000000401dd0 R14: 0000000000000000 R15: 0000000000000000 [ 56.089006][ T6804] Modules linked in: [ 56.089020][ T6804] ---[ end trace b0133260e4b79a6b ]--- [ 56.089032][ T6804] RIP: 0010:do_con_write+0x8dd/0x1d70 [ 56.089044][ T6804] Code: 89 0f 84 fd 48 8b 44 24 18 0b 5c 24 74 80 38 00 0f 85 f4 10 00 00 4d 8b a6 08 04 00 00 4c 89 e0 4c 89 e2 48 c1 e8 03 83 e2 07 <0f> b6 0c 28 83 c2 01 38 ca 7c 08 84 c9 0f 85 c0 10 00 00 66 41 89 [ 56.089049][ T6804] RSP: 0018:ffffc90000f87a68 EFLAGS: 00010202 [ 56.089065][ T6804] RAX: 0000000020000001 RBX: 00000000000007fe RCX: ffffffff83eff73c [ 56.089072][ T6804] RDX: 0000000000000004 RSI: ffffffff83eff777 RDI: 0000000000000003 [ 56.089080][ T6804] RBP: dffffc0000000000 R08: ffffffff83eeaad0 R09: ffff88808e4beb10 [ 56.089087][ T6804] R10: 0000000000000000 R11: 0000000000000000 R12: 000000010000000c [ 56.089093][ T6804] R13: 0000000000000001 R14: ffff888099bfe000 R15: 0000000000000000 [ 56.089103][ T6804] FS: 00000000006eb880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 56.089110][ T6804] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.089117][ T6804] CR2: 00000000004553a0 CR3: 000000009e3b2000 CR4: 00000000001506f0 [ 56.089126][ T6804] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 56.089133][ T6804] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 56.089139][ T6804] Kernel panic - not syncing: Fatal exception [ 56.091028][ T6804] Kernel Offset: disabled [ 56.553156][ T6804] Rebooting in 86400 seconds..