[ 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 '10.128.10.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 63.194752][ T7138] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN [ 63.208704][ T7138] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 63.217295][ T7138] CPU: 0 PID: 7138 Comm: syz-executor210 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 [ 63.227183][ T7138] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.237326][ T7138] RIP: 0010:fq_codel_enqueue+0xa75/0x11b0 [ 63.243534][ T7138] Code: 22 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 23 28 22 fb 48 8b 44 24 40 80 38 00 0f 85 5a 05 00 00 49 8b 06 48 89 c2 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 52 05 00 00 48 8b 10 49 89 16 48 89 c2 48 c1 [ 63.263658][ T7138] RSP: 0018:ffffc9000158f6a0 EFLAGS: 00010246 [ 63.269721][ T7138] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000158f880 [ 63.277706][ T7138] RDX: 0000000000000000 RSI: ffffffff86510c6d RDI: 0000000000000000 [ 63.285871][ T7138] RBP: ffffc9000158f7b0 R08: ffff888095e84300 R09: fffffbfff1862754 [ 63.293857][ T7138] R10: ffffffff8c313a9f R11: fffffbfff1862753 R12: 0000000000000400 [ 63.301905][ T7138] R13: dffffc0000000000 R14: ffff888085340000 R15: ffffc9000158f880 [ 63.312042][ T7138] FS: 000000000166b880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 63.321440][ T7138] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.328136][ T7138] CR2: 0000000020000100 CR3: 000000009cca4000 CR4: 00000000001406f0 [ 63.336323][ T7138] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.345168][ T7138] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.353224][ T7138] Call Trace: [ 63.356512][ T7138] ? drop_func+0x60/0x60 [ 63.360742][ T7138] ? rwlock_bug.part.0+0x90/0x90 [ 63.365673][ T7138] ? rcu_read_lock_bh_held+0x5a/0xb0 [ 63.370949][ T7138] ? rcu_read_lock_sched_held+0xd0/0xd0 [ 63.376481][ T7138] __dev_queue_xmit+0x154a/0x3070 [ 63.381502][ T7138] ? netdev_core_pick_tx+0x2e0/0x2e0 [ 63.386838][ T7138] ? _copy_from_iter+0x270/0xb60 [ 63.391766][ T7138] ? __phys_addr_symbol+0x2c/0x70 [ 63.396798][ T7138] ? __check_object_size+0x171/0x437 [ 63.402071][ T7138] ? packet_parse_headers.isra.0+0x117/0x470 [ 63.408086][ T7138] ? __unregister_prot_hook+0x320/0x320 [ 63.413642][ T7138] ? packet_sendmsg+0x23cc/0x5ce0 [ 63.418825][ T7138] packet_sendmsg+0x23cc/0x5ce0 [ 63.423683][ T7138] ? aa_label_sk_perm+0x89/0xe0 [ 63.428514][ T7138] ? aa_sk_perm+0x319/0xac0 [ 63.433046][ T7138] ? packet_notifier+0x860/0x860 [ 63.437977][ T7138] ? aa_af_perm+0x260/0x260 [ 63.442458][ T7138] ? lock_downgrade+0x840/0x840 [ 63.447570][ T7138] ? packet_notifier+0x860/0x860 [ 63.452520][ T7138] sock_sendmsg+0xcf/0x120 [ 63.456968][ T7138] sock_write_iter+0x289/0x3c0 [ 63.464166][ T7138] ? sock_sendmsg+0x120/0x120 [ 63.468863][ T7138] ? packet_do_bind+0x452/0xc00 [ 63.473695][ T7138] new_sync_write+0x4a2/0x700 [ 63.478476][ T7138] ? new_sync_read+0x7a0/0x7a0 [ 63.483290][ T7138] ? apparmor_path_rmdir+0x30/0x30 [ 63.488843][ T7138] ? security_file_permission+0x8c/0x470 [ 63.494709][ T7138] __vfs_write+0xc9/0x100 [ 63.499044][ T7138] vfs_write+0x268/0x5d0 [ 63.503281][ T7138] ksys_write+0x1ee/0x250 [ 63.507692][ T7138] ? __ia32_sys_read+0xb0/0xb0 [ 63.512476][ T7138] ? trace_hardirqs_off_caller+0x55/0x230 [ 63.518199][ T7138] do_syscall_64+0xf6/0x7d0 [ 63.522710][ T7138] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 63.529017][ T7138] RIP: 0033:0x440599 [ 63.532908][ T7138] 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 [ 63.552778][ T7138] RSP: 002b:00007ffe57842978 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 63.561195][ T7138] RAX: ffffffffffffffda RBX: 00000000004a173e RCX: 0000000000440599 [ 63.569164][ T7138] RDX: 000000000000006c RSI: 00000000200003c0 RDI: 0000000000000005 [ 63.577117][ T7138] RBP: 54c6c2ff093a6d32 R08: 00000000004002c8 R09: 00000000004002c8 [ 63.585087][ T7138] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000010000 [ 63.593413][ T7138] R13: 0000000000401eb0 R14: 0000000000000000 R15: 0000000000000000 [ 63.601366][ T7138] Modules linked in: [ 63.605347][ T7138] ---[ end trace d314d68c9532ac29 ]--- [ 63.611489][ T7138] RIP: 0010:fq_codel_enqueue+0xa75/0x11b0 [ 63.617633][ T7138] Code: 22 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 23 28 22 fb 48 8b 44 24 40 80 38 00 0f 85 5a 05 00 00 49 8b 06 48 89 c2 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 52 05 00 00 48 8b 10 49 89 16 48 89 c2 48 c1 [ 63.637638][ T7138] RSP: 0018:ffffc9000158f6a0 EFLAGS: 00010246 [ 63.643721][ T7138] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000158f880 [ 63.651881][ T7138] RDX: 0000000000000000 RSI: ffffffff86510c6d RDI: 0000000000000000 [ 63.660942][ T7138] RBP: ffffc9000158f7b0 R08: ffff888095e84300 R09: fffffbfff1862754 [ 63.669390][ T7138] R10: ffffffff8c313a9f R11: fffffbfff1862753 R12: 0000000000000400 [ 63.677587][ T7138] R13: dffffc0000000000 R14: ffff888085340000 R15: ffffc9000158f880 [ 63.686241][ T7138] FS: 000000000166b880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 63.695225][ T7138] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.701810][ T7138] CR2: 0000000020000100 CR3: 000000009cca4000 CR4: 00000000001406f0 [ 63.709980][ T7138] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.718012][ T7138] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.726115][ T7138] Kernel panic - not syncing: Fatal exception in interrupt [ 63.734616][ T7138] Kernel Offset: disabled [ 63.738961][ T7138] Rebooting in 86400 seconds..