[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.134' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 56.620328][ T7020] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN [ 56.632053][ T7020] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 56.641025][ T7020] CPU: 1 PID: 7020 Comm: syz-executor380 Not tainted 5.7.0-rc5-syzkaller #0 [ 56.649802][ T7020] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.660305][ T7020] RIP: 0010:fq_codel_enqueue+0xa75/0x11b0 [ 56.666040][ T7020] Code: 27 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 13 87 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 [ 56.685778][ T7020] RSP: 0018:ffffc900016276a0 EFLAGS: 00010246 [ 56.691838][ T7020] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90001627880 [ 56.699786][ T7020] RDX: 0000000000000000 RSI: ffffffff864bad6d RDI: 0000000000000000 [ 56.707741][ T7020] RBP: ffffc900016277b0 R08: ffff88809051c1c0 R09: fffffbfff185dd44 [ 56.715687][ T7020] R10: ffffffff8c2eea1f R11: fffffbfff185dd43 R12: 0000000000000400 [ 56.723631][ T7020] R13: dffffc0000000000 R14: ffff888085e40000 R15: ffffc90001627880 [ 56.731760][ T7020] FS: 00000000025ad880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 56.740663][ T7020] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.747219][ T7020] CR2: 0000000020000100 CR3: 000000008cadb000 CR4: 00000000001406e0 [ 56.755166][ T7020] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 56.763112][ T7020] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 56.771055][ T7020] Call Trace: [ 56.774341][ T7020] ? drop_func+0x60/0x60 [ 56.778563][ T7020] ? rwlock_bug.part.0+0x90/0x90 [ 56.783514][ T7020] ? rcu_read_lock_bh_held+0x5a/0xb0 [ 56.788773][ T7020] ? rcu_read_lock_sched_held+0xd0/0xd0 [ 56.794292][ T7020] __dev_queue_xmit+0x154a/0x30a0 [ 56.799299][ T7020] ? netdev_core_pick_tx+0x2e0/0x2e0 [ 56.804555][ T7020] ? _copy_from_iter+0x307/0xb60 [ 56.809467][ T7020] ? __check_object_size+0x171/0x437 [ 56.814724][ T7020] ? packet_parse_headers.isra.0+0x11c/0x470 [ 56.820675][ T7020] ? packet_seq_start+0x150/0x150 [ 56.825681][ T7020] ? packet_sendmsg+0x24fd/0x5e90 [ 56.830678][ T7020] packet_sendmsg+0x24fd/0x5e90 [ 56.835518][ T7020] ? aa_label_sk_perm+0x89/0xe0 [ 56.840353][ T7020] ? aa_sk_perm+0x319/0xab0 [ 56.844827][ T7020] ? packet_notifier+0x860/0x860 [ 56.849754][ T7020] ? aa_af_perm+0x260/0x260 [ 56.854590][ T7020] ? lock_downgrade+0x840/0x840 [ 56.859415][ T7020] ? packet_notifier+0x860/0x860 [ 56.864329][ T7020] sock_sendmsg+0xcf/0x120 [ 56.868724][ T7020] sock_write_iter+0x289/0x3c0 [ 56.873462][ T7020] ? sock_sendmsg+0x120/0x120 [ 56.878110][ T7020] ? packet_do_bind+0x452/0xc00 [ 56.882943][ T7020] new_sync_write+0x4a2/0x700 [ 56.887590][ T7020] ? new_sync_read+0x7a0/0x7a0 [ 56.892338][ T7020] ? apparmor_path_rmdir+0x30/0x30 [ 56.897425][ T7020] ? security_file_permission+0x8c/0x470 [ 56.903027][ T7020] __vfs_write+0xc9/0x100 [ 56.907329][ T7020] vfs_write+0x268/0x5d0 [ 56.911543][ T7020] ksys_write+0x1ee/0x250 [ 56.915842][ T7020] ? __ia32_sys_read+0xb0/0xb0 [ 56.920575][ T7020] ? trace_hardirqs_off_caller+0x55/0x230 [ 56.926274][ T7020] do_syscall_64+0xf6/0x7d0 [ 56.930761][ T7020] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 56.936971][ T7020] RIP: 0033:0x440599 [ 56.940850][ T7020] 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 [ 56.960521][ T7020] RSP: 002b:00007ffdf201cc38 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 56.968929][ T7020] RAX: ffffffffffffffda RBX: 00000000004a173e RCX: 0000000000440599 [ 56.976878][ T7020] RDX: 000000000000006c RSI: 00000000200003c0 RDI: 0000000000000005 [ 56.984822][ T7020] RBP: 54c6c2ff093a6d32 R08: 00000000004002c8 R09: 00000000004002c8 [ 56.992769][ T7020] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000010000 [ 57.000718][ T7020] R13: 0000000000401eb0 R14: 0000000000000000 R15: 0000000000000000 [ 57.008663][ T7020] Modules linked in: [ 57.013028][ T7020] ---[ end trace 9c550931382369ac ]--- [ 57.018490][ T7020] RIP: 0010:fq_codel_enqueue+0xa75/0x11b0 [ 57.024260][ T7020] Code: 27 fb 44 3b 64 24 70 0f 83 dd 00 00 00 e8 13 87 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 [ 57.043915][ T7020] RSP: 0018:ffffc900016276a0 EFLAGS: 00010246 [ 57.050025][ T7020] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90001627880 [ 57.058850][ T7020] RDX: 0000000000000000 RSI: ffffffff864bad6d RDI: 0000000000000000 [ 57.066840][ T7020] RBP: ffffc900016277b0 R08: ffff88809051c1c0 R09: fffffbfff185dd44 [ 57.074840][ T7020] R10: ffffffff8c2eea1f R11: fffffbfff185dd43 R12: 0000000000000400 [ 57.082830][ T7020] R13: dffffc0000000000 R14: ffff888085e40000 R15: ffffc90001627880 [ 57.090826][ T7020] FS: 00000000025ad880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 57.099779][ T7020] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.106365][ T7020] CR2: 0000000020000100 CR3: 000000008cadb000 CR4: 00000000001406e0 [ 57.114362][ T7020] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.122357][ T7020] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.130387][ T7020] Kernel panic - not syncing: Fatal exception in interrupt [ 57.138875][ T7020] Kernel Offset: disabled [ 57.143188][ T7020] Rebooting in 86400 seconds..