[ OK ] Started OpenBSD Secure Shell server. [ 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 '10.128.0.83' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.160568][ T8419] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN [ 50.172326][ T8419] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 50.180721][ T8419] CPU: 1 PID: 8419 Comm: syz-executor210 Not tainted 5.14.0-rc7-syzkaller #0 [ 50.189461][ T8419] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.199508][ T8419] RIP: 0010:fq_codel_enqueue+0xcf0/0x1560 [ 50.205244][ T8419] Code: 8b 84 24 88 00 00 00 42 80 3c 20 00 48 8b 5c 24 40 74 08 48 89 df e8 ef 53 a4 f9 44 89 74 24 20 4c 8b 2b 4d 89 ef 49 c1 ef 03 <43> 80 3c 27 00 74 08 4c 89 ef e8 d1 53 a4 f9 4d 8b 75 00 4c 89 e3 [ 50.224835][ T8419] RSP: 0018:ffffc9000ac96f40 EFLAGS: 00010246 [ 50.230896][ T8419] RAX: 1ffff11007604000 RBX: ffff88803b020000 RCX: ffff88803b020000 [ 50.238993][ T8419] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 50.247061][ T8419] RBP: ffffc9000ac970d0 R08: ffffffff88252d1b R09: fffffbfff1f5e7d2 [ 50.255021][ T8419] R10: fffffbfff1f5e7d2 R11: 0000000000000000 R12: dffffc0000000000 [ 50.263076][ T8419] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 50.271125][ T8419] FS: 0000000001954300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 50.280048][ T8419] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.286733][ T8419] CR2: 00007f334775e6c0 CR3: 00000000345d7000 CR4: 00000000001506e0 [ 50.295002][ T8419] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.303408][ T8419] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.311375][ T8419] Call Trace: [ 50.314658][ T8419] ? asan.module_dtor+0x20/0x20 [ 50.319553][ T8419] __dev_queue_xmit+0xcaa/0x34b0 [ 50.324478][ T8419] ? entry_SYSCALL_64_after_hwframe+0x44/0xae [ 50.330633][ T8419] ? dev_queue_xmit+0x20/0x20 [ 50.335295][ T8419] ? rcu_read_lock_sched_held+0x87/0x110 [ 50.340909][ T8419] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 50.346872][ T8419] ? skb_release_data+0x174/0x4f0 [ 50.351878][ T8419] ? is_percpu_thread+0x4f/0xc0 [ 50.356736][ T8419] ? check_preemption_disabled+0xa3/0x180 [ 50.362456][ T8419] __bpf_redirect+0x9a0/0xe00 [ 50.367121][ T8419] bpf_clone_redirect+0x243/0x350 [ 50.372133][ T8419] bpf_prog_cc75667d52cf7bb0+0x56/0x528 [ 50.379672][ T8419] ? lockdep_hardirqs_on_prepare+0x3e2/0x750 [ 50.385704][ T8419] ? __lock_acquire+0x6100/0x6100 [ 50.390882][ T8419] ? print_irqtrace_events+0x220/0x220 [ 50.396347][ T8419] ? ktime_get+0x95/0x2b0 [ 50.400686][ T8419] ? seqcount_lockdep_reader_access+0x146/0x200 [ 50.407094][ T8419] ? lockdep_hardirqs_on+0x8d/0x130 [ 50.412418][ T8419] ? seqcount_lockdep_reader_access+0x1ae/0x200 [ 50.418656][ T8419] ? ktime_get_real_ts64+0x4b0/0x4b0 [ 50.424083][ T8419] ? __debug_object_init+0x847/0x1880 [ 50.429457][ T8419] ? do_syscall_64+0x3d/0xb0 [ 50.434035][ T8419] ? __cant_sleep+0x220/0x220 [ 50.438709][ T8419] ? ktime_get+0x27c/0x2b0 [ 50.443340][ T8419] bpf_test_run+0x506/0xa60 [ 50.447836][ T8419] ? bpf_ctx_init+0x1a0/0x1a0 [ 50.452496][ T8419] ? eth_type_trans+0x2fd/0x750 [ 50.457332][ T8419] ? eth_get_headlen+0x240/0x240 [ 50.462253][ T8419] ? build_skb+0x102/0x170 [ 50.466661][ T8419] bpf_prog_test_run_skb+0xa45/0x1df0 [ 50.472310][ T8419] ? __bpf_prog_test_run_raw_tp+0x300/0x300 [ 50.478190][ T8419] ? __fdget+0x14b/0x210 [ 50.482419][ T8419] ? __bpf_prog_test_run_raw_tp+0x300/0x300 [ 50.488293][ T8419] __sys_bpf+0x5301/0x11d60 [ 50.492799][ T8419] ? __lock_acquire+0x145b/0x6100 [ 50.497824][ T8419] ? __lock_acquire+0x145b/0x6100 [ 50.502835][ T8419] ? bpf_link_show_fdinfo+0x2d0/0x2d0 [ 50.508187][ T8419] ? trace_lock_acquire+0x190/0x190 [ 50.513366][ T8419] ? trace_lock_acquire+0x190/0x190 [ 50.518547][ T8419] ? iovec_from_user+0x359/0x390 [ 50.523463][ T8419] ? __import_iovec+0x35f/0x500 [ 50.528326][ T8419] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 50.533591][ T8419] ? security_socket_sendmsg+0x9d/0xb0 [ 50.539035][ T8419] ? rcu_read_lock_sched_held+0x87/0x110 [ 50.544667][ T8419] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 50.550633][ T8419] ? __context_tracking_exit+0x7a/0xd0 [ 50.556075][ T8419] ? rcu_read_lock_sched_held+0x87/0x110 [ 50.561693][ T8419] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 50.567661][ T8419] ? __context_tracking_exit+0x7a/0xd0 [ 50.573102][ T8419] ? __lock_acquire+0x6100/0x6100 [ 50.578111][ T8419] ? syscall_enter_from_user_mode+0x2e/0x1b0 [ 50.584070][ T8419] ? lockdep_hardirqs_on+0x8d/0x130 [ 50.589265][ T8419] __x64_sys_bpf+0x78/0x90 [ 50.593664][ T8419] do_syscall_64+0x3d/0xb0 [ 50.598064][ T8419] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 50.604024][ T8419] RIP: 0033:0x43f349 [ 50.607903][ T8419] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 50.627492][ T8419] RSP: 002b:00007ffc0a371788 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 50.635884][ T8419] RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043f349 [ 50.643855][ T8419] RDX: 0000000000000048 RSI: 0000000020000140 RDI: 000000000000000a [ 50.651842][ T8419] RBP: 0000000000403330 R08: 0000000000400488 R09: 0000000000400488 [ 50.659802][ T8419] R10: 0000000000400488 R11: 0000000000000246 R12: 00000000004033c0 [ 50.667770][ T8419] R13: 0000000000000000 R14: 00000000004ad018 R15: 0000000000400488 [ 50.675904][ T8419] Modules linked in: [ 50.679864][ T8419] ---[ end trace 801b0b210233ddfe ]--- [ 50.685320][ T8419] RIP: 0010:fq_codel_enqueue+0xcf0/0x1560 [ 50.691099][ T8419] Code: 8b 84 24 88 00 00 00 42 80 3c 20 00 48 8b 5c 24 40 74 08 48 89 df e8 ef 53 a4 f9 44 89 74 24 20 4c 8b 2b 4d 89 ef 49 c1 ef 03 <43> 80 3c 27 00 74 08 4c 89 ef e8 d1 53 a4 f9 4d 8b 75 00 4c 89 e3 [ 50.711248][ T8419] RSP: 0018:ffffc9000ac96f40 EFLAGS: 00010246 [ 50.717324][ T8419] RAX: 1ffff11007604000 RBX: ffff88803b020000 RCX: ffff88803b020000 [ 50.725405][ T8419] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 50.733458][ T8419] RBP: ffffc9000ac970d0 R08: ffffffff88252d1b R09: fffffbfff1f5e7d2 [ 50.741484][ T8419] R10: fffffbfff1f5e7d2 R11: 0000000000000000 R12: dffffc0000000000 [ 50.749462][ T8419] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 50.757481][ T8419] FS: 0000000001954300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 50.766463][ T8419] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.773126][ T8419] CR2: 00007f334775e6c0 CR3: 00000000345d7000 CR4: 00000000001506e0 [ 50.781157][ T8419] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.789139][ T8419] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.797187][ T8419] Kernel panic - not syncing: Fatal exception in interrupt [ 50.806012][ T8419] Kernel Offset: disabled [ 50.810337][ T8419] Rebooting in 86400 seconds..