[ OK ] Started Getty on tty5. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 46.784412][ T6772] general protection fault, probably for non-canonical address 0xdffffc0020000001: 0000 [#1] PREEMPT SMP KASAN [ 46.784421][ T6772] KASAN: probably user-memory-access in range [0x0000000100000008-0x000000010000000f] [ 46.784432][ T6772] CPU: 0 PID: 6772 Comm: syz-executor138 Not tainted 5.8.0-rc3-syzkaller #0 [ 46.784437][ T6772] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.784452][ T6772] RIP: 0010:do_con_write+0x1a6a/0xf2d0 [ 46.784461][ T6772] Code: 02 00 00 48 8b 7c 24 60 49 89 ff 49 c1 ef 03 43 80 3c 2f 00 74 0a e8 05 02 b2 fd 48 8b 7c 24 60 48 8b 1f 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c5 02 00 00 66 44 89 33 48 c7 c7 64 2c [ 46.784466][ T6772] RSP: 0018:ffffc90000f87900 EFLAGS: 00010203 [ 46.784474][ T6772] RAX: 0000000020000001 RBX: 000000010000000c RCX: ffff88809256e4c0 [ 46.784480][ T6772] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a73353f0 [ 46.784486][ T6772] RBP: ffffc90000f87be8 R08: ffffffff84017411 R09: ffffffff83ffa040 [ 46.784491][ T6772] R10: 0000000000000006 R11: ffff88809256e4c0 R12: ffff8880a7335000 [ 46.784498][ T6772] R13: dffffc0000000000 R14: 00000000000007fe R15: 1ffff11014e66a7e [ 46.784506][ T6772] FS: 0000000000eb5880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 46.784512][ T6772] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.784518][ T6772] CR2: 00000000004553a0 CR3: 00000000994c8000 CR4: 00000000001406f0 [ 46.784530][ T6772] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.784535][ T6772] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.784538][ T6772] Call Trace: [ 46.784587][ T6772] ? lockdep_hardirqs_on_prepare+0x425/0x6e0 [ 46.784600][ T6772] ? _raw_spin_unlock_irqrestore+0x6f/0xd0 [ 46.784610][ T6772] con_write+0x20/0x40 [ 46.784620][ T6772] n_tty_write+0xcbf/0x1170 [ 46.784636][ T6772] ? wait_woken+0x240/0x240 [ 46.784649][ T6772] tty_write+0x593/0x940 [ 46.784659][ T6772] ? n_tty_read+0x1ba0/0x1ba0 [ 46.784669][ T6772] ? redirected_tty_write+0xb0/0xb0 [ 46.784680][ T6772] __vfs_write+0x9c/0x6e0 [ 46.784692][ T6772] ? lock_is_held_type+0x87/0xe0 [ 46.784702][ T6772] ? rcu_read_lock_sched_held+0x2f/0xa0 [ 46.784712][ T6772] ? trace_kmem_cache_free+0xb2/0x100 [ 46.784721][ T6772] ? fsnotify_perm+0x64/0x390 [ 46.784731][ T6772] vfs_write+0x274/0x580 [ 46.784743][ T6772] ksys_write+0x11b/0x220 [ 46.784754][ T6772] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.784762][ T6772] do_syscall_64+0x73/0xe0 [ 46.784773][ T6772] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.784780][ T6772] RIP: 0033:0x440459 [ 46.784783][ T6772] Code: Bad RIP value. [ 46.784788][ T6772] RSP: 002b:00007fffd08302b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 46.784796][ T6772] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440459 [ 46.784801][ T6772] RDX: 0000000000001006 RSI: 0000000020000240 RDI: 0000000000000004 [ 46.784806][ T6772] RBP: 00000000006cb018 R08: 000000000000000e R09: 00000000004002c8 [ 46.784812][ T6772] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401d40 [ 46.784817][ T6772] R13: 0000000000401dd0 R14: 0000000000000000 R15: 0000000000000000 [ 46.784825][ T6772] Modules linked in: [ 46.784837][ T6772] ---[ end trace f189c63f77d941ee ]--- [ 46.784847][ T6772] RIP: 0010:do_con_write+0x1a6a/0xf2d0 [ 46.784855][ T6772] Code: 02 00 00 48 8b 7c 24 60 49 89 ff 49 c1 ef 03 43 80 3c 2f 00 74 0a e8 05 02 b2 fd 48 8b 7c 24 60 48 8b 1f 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 c5 02 00 00 66 44 89 33 48 c7 c7 64 2c [ 46.784860][ T6772] RSP: 0018:ffffc90000f87900 EFLAGS: 00010203 [ 46.784867][ T6772] RAX: 0000000020000001 RBX: 000000010000000c RCX: ffff88809256e4c0 [ 46.784873][ T6772] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a73353f0 [ 46.784878][ T6772] RBP: ffffc90000f87be8 R08: ffffffff84017411 R09: ffffffff83ffa040 [ 46.784884][ T6772] R10: 0000000000000006 R11: ffff88809256e4c0 R12: ffff8880a7335000 [ 46.784890][ T6772] R13: dffffc0000000000 R14: 00000000000007fe R15: 1ffff11014e66a7e [ 46.784897][ T6772] FS: 0000000000eb5880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 46.784903][ T6772] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.784908][ T6772] CR2: 00000000004553a0 CR3: 00000000994c8000 CR4: 00000000001406f0 [ 46.784919][ T6772] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.784924][ T6772] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.784929][ T6772] Kernel panic - not syncing: Fatal exception [ 46.785943][ T6772] Kernel Offset: disabled [ 47.213985][ T6772] Rebooting in 86400 seconds..