[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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 '10.128.0.97' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 62.617198][ T7036] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN [ 62.629125][ T7036] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 62.637585][ T7036] CPU: 0 PID: 7036 Comm: syz-executor027 Not tainted 5.7.0-rc7-syzkaller #0 [ 62.646479][ T7036] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.656613][ T7036] RIP: 0010:fq_codel_enqueue+0xa75/0x11b0 [ 62.662401][ T7036] Code: 27 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 d3 70 27 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 [ 62.682250][ T7036] RSP: 0018:ffffc900010976a0 EFLAGS: 00010246 [ 62.688318][ T7036] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90001097880 [ 62.696277][ T7036] RDX: 0000000000000000 RSI: ffffffff864bcddd RDI: 0000000000000000 [ 62.704416][ T7036] RBP: ffffc900010977b0 R08: ffff88808bee62c0 R09: fffffbfff185df44 [ 62.712674][ T7036] R10: ffffffff8c2efa1f R11: fffffbfff185df43 R12: 0000000000000400 [ 62.720879][ T7036] R13: dffffc0000000000 R14: ffff888086240000 R15: ffffc90001097880 [ 62.729347][ T7036] FS: 0000000002055880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 62.738270][ T7036] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 62.744846][ T7036] CR2: 0000000020000100 CR3: 0000000094c8e000 CR4: 00000000001406f0 [ 62.752826][ T7036] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 62.760795][ T7036] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 62.768739][ T7036] Call Trace: [ 62.772012][ T7036] ? drop_func+0x60/0x60 [ 62.776256][ T7036] ? rwlock_bug.part.0+0x90/0x90 [ 62.781212][ T7036] ? rcu_read_lock_bh_held+0x5a/0xb0 [ 62.786500][ T7036] ? rcu_read_lock_sched_held+0xd0/0xd0 [ 62.792036][ T7036] __dev_queue_xmit+0x154a/0x30a0 [ 62.797206][ T7036] ? netdev_core_pick_tx+0x2e0/0x2e0 [ 62.802479][ T7036] ? _copy_from_iter+0x307/0xb60 [ 62.807413][ T7036] ? __check_object_size+0x171/0x437 [ 62.812755][ T7036] ? packet_parse_headers.isra.0+0x11c/0x470 [ 62.818722][ T7036] ? packet_seq_start+0x150/0x150 [ 62.823746][ T7036] ? packet_sendmsg+0x24fd/0x5e90 [ 62.828871][ T7036] packet_sendmsg+0x24fd/0x5e90 [ 62.833828][ T7036] ? aa_label_sk_perm+0x89/0xe0 [ 62.838808][ T7036] ? aa_sk_perm+0x319/0xab0 [ 62.843325][ T7036] ? packet_notifier+0x860/0x860 [ 62.848249][ T7036] ? aa_af_perm+0x260/0x260 [ 62.852739][ T7036] ? lock_downgrade+0x840/0x840 [ 62.857594][ T7036] ? packet_notifier+0x860/0x860 [ 62.862600][ T7036] sock_sendmsg+0xcf/0x120 [ 62.867009][ T7036] sock_write_iter+0x289/0x3c0 [ 62.871750][ T7036] ? sock_sendmsg+0x120/0x120 [ 62.876456][ T7036] ? packet_do_bind+0x452/0xc00 [ 62.881787][ T7036] new_sync_write+0x4a2/0x700 [ 62.886552][ T7036] ? new_sync_read+0x7a0/0x7a0 [ 62.892112][ T7036] ? apparmor_path_rmdir+0x30/0x30 [ 62.897332][ T7036] ? security_file_permission+0x8c/0x470 [ 62.904042][ T7036] __vfs_write+0xc9/0x100 [ 62.908360][ T7036] vfs_write+0x268/0x5d0 [ 62.912762][ T7036] ksys_write+0x1ee/0x250 [ 62.917082][ T7036] ? __ia32_sys_read+0xb0/0xb0 [ 62.921843][ T7036] ? trace_hardirqs_off_caller+0x55/0x230 [ 62.927666][ T7036] do_syscall_64+0xf6/0x7d0 [ 62.932153][ T7036] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 62.938334][ T7036] RIP: 0033:0x440599 [ 62.942340][ T7036] 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 [ 62.962169][ T7036] RSP: 002b:00007fff444744f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 62.970581][ T7036] RAX: ffffffffffffffda RBX: 00000000004a173e RCX: 0000000000440599 [ 62.978547][ T7036] RDX: 000000000000006c RSI: 00000000200003c0 RDI: 0000000000000005 [ 62.986505][ T7036] RBP: 54c6c2ff093a6d32 R08: 00000000004002c8 R09: 00000000004002c8 [ 62.994450][ T7036] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000010000 [ 63.002395][ T7036] R13: 0000000000401eb0 R14: 0000000000000000 R15: 0000000000000000 [ 63.010365][ T7036] Modules linked in: [ 63.014336][ T7036] ---[ end trace 6ca6d2b81633e941 ]--- [ 63.019805][ T7036] RIP: 0010:fq_codel_enqueue+0xa75/0x11b0 [ 63.025605][ T7036] Code: 27 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 d3 70 27 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 [ 63.045432][ T7036] RSP: 0018:ffffc900010976a0 EFLAGS: 00010246 [ 63.051539][ T7036] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90001097880 [ 63.059503][ T7036] RDX: 0000000000000000 RSI: ffffffff864bcddd RDI: 0000000000000000 [ 63.067500][ T7036] RBP: ffffc900010977b0 R08: ffff88808bee62c0 R09: fffffbfff185df44 [ 63.075506][ T7036] R10: ffffffff8c2efa1f R11: fffffbfff185df43 R12: 0000000000000400 [ 63.083748][ T7036] R13: dffffc0000000000 R14: ffff888086240000 R15: ffffc90001097880 [ 63.091885][ T7036] FS: 0000000002055880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 63.100840][ T7036] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.107455][ T7036] CR2: 0000000020000100 CR3: 0000000094c8e000 CR4: 00000000001406f0 [ 63.115487][ T7036] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.123594][ T7036] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.131616][ T7036] Kernel panic - not syncing: Fatal exception in interrupt [ 63.140186][ T7036] Kernel Offset: disabled [ 63.144790][ T7036] Rebooting in 86400 seconds..