[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 41.902235] kasan: CONFIG_KASAN_INLINE enabled [ 41.906923] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 41.914271] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 41.920498] CPU: 0 PID: 8090 Comm: syz-executor219 Not tainted 4.19.172-syzkaller #0 [ 41.928358] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.937713] RIP: 0010:fq_codel_enqueue+0x8ad/0x1100 [ 41.942708] Code: 79 bb cc fa 45 39 ec 0f 83 cb 00 00 00 e8 7b ba cc fa 48 8b 44 24 10 80 38 00 0f 85 69 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 3d 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48 [ 41.961719] RSP: 0018:ffff8880974cf6e0 EFLAGS: 00010246 [ 41.967063] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff86959ea5 [ 41.974326] RDX: 0000000000000000 RSI: ffffffff86959f45 RDI: 0000000000000004 [ 41.981583] RBP: ffff8880974cf8a0 R08: ffffffff8c65d018 R09: 0000000000000400 [ 41.988852] R10: 0000000000000004 R11: ffffffff8c65d01b R12: 0000000000000400 [ 41.996120] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88808cf40140 [ 42.003372] FS: 0000000001a2b300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 42.011759] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.017625] CR2: 0000000020000080 CR3: 00000000a9bf1000 CR4: 00000000001406f0 [ 42.024881] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.032136] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.039385] Call Trace: [ 42.041972] ? fq_codel_walk+0x2c0/0x2c0 [ 42.046016] ? __dev_queue_xmit+0x134e/0x2e00 [ 42.050503] __dev_queue_xmit+0x140a/0x2e00 [ 42.054832] ? __kmalloc_node_track_caller+0x38/0x70 [ 42.059927] ? netdev_pick_tx+0x2f0/0x2f0 [ 42.064055] ? skb_release_data+0x135/0x920 [ 42.068358] ? kmem_cache_alloc_node_trace+0x351/0x3b0 [ 42.073614] ? skb_headers_offset_update+0x12e/0x260 [ 42.078697] ? pskb_expand_head+0x59e/0xf20 [ 42.083013] __bpf_redirect+0x746/0xbc0 [ 42.086988] ? skb_ensure_writable+0xee/0x470 [ 42.091464] bpf_clone_redirect+0x2c0/0x430 [ 42.095772] bpf_prog_cc75667d52cf7bb0+0x583/0x1000 [ 42.100775] ? mark_held_locks+0xf0/0xf0 [ 42.104824] ? mark_held_locks+0xf0/0xf0 [ 42.108864] ? alloc_file+0x326/0x4d0 [ 42.112691] ? bpf_test_run+0x71/0x440 [ 42.116565] ? bpf_test_run+0x71/0x440 [ 42.120475] ? lock_acquire+0x170/0x3c0 [ 42.124452] ? bpf_test_run+0x1dd/0x440 [ 42.128416] ? check_preemption_disabled+0x41/0x280 [ 42.133442] ? rcu_is_watching+0x53/0xc0 [ 42.137514] ? bpf_test_run+0x109/0x440 [ 42.141483] ? bpf_prog_test_run_skb+0x579/0x9c0 [ 42.146224] ? bpf_test_finish.isra.0+0x1a0/0x1a0 [ 42.151058] ? bpf_prog_add+0x65/0xd0 [ 42.154841] ? bpf_test_finish.isra.0+0x1a0/0x1a0 [ 42.159686] ? __se_sys_bpf+0xc9e/0x3a20 [ 42.163730] ? bpf_prog_load+0x1240/0x1240 [ 42.167968] ? __x64_sys_sendmsg+0x159/0x220 [ 42.172361] ? __sys_sendmsg+0x1b0/0x1b0 [ 42.176405] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 42.181754] ? trace_hardirqs_off_caller+0x6e/0x210 [ 42.186749] ? do_syscall_64+0x21/0x620 [ 42.190719] ? do_syscall_64+0xf9/0x620 [ 42.194703] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.200048] Modules linked in: [ 42.203294] ---[ end trace 26d6a09a0f3bc910 ]--- [ 42.208080] RIP: 0010:fq_codel_enqueue+0x8ad/0x1100 [ 42.213114] Code: 79 bb cc fa 45 39 ec 0f 83 cb 00 00 00 e8 7b ba cc fa 48 8b 44 24 10 80 38 00 0f 85 69 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 3d 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48 [ 42.232053] RSP: 0018:ffff8880974cf6e0 EFLAGS: 00010246 [ 42.237469] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff86959ea5 [ 42.244769] RDX: 0000000000000000 RSI: ffffffff86959f45 RDI: 0000000000000004 [ 42.252030] RBP: ffff8880974cf8a0 R08: ffffffff8c65d018 R09: 0000000000000400 [ 42.259336] R10: 0000000000000004 R11: ffffffff8c65d01b R12: 0000000000000400 [ 42.266635] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88808cf40140 [ 42.274006] FS: 0000000001a2b300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 42.282277] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.288187] CR2: 0000000020000080 CR3: 00000000a9bf1000 CR4: 00000000001406f0 [ 42.295517] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.302805] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.310127] Kernel panic - not syncing: Fatal exception in interrupt [ 42.317054] Kernel Offset: disabled [ 42.320667] Rebooting in 86400 seconds..