[ 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 '10.128.0.72' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.936077] audit: type=1400 audit(1590149076.216:8): avc: denied { execmem } for pid=6330 comm="syz-executor005" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 32.956910] kasan: CONFIG_KASAN_INLINE enabled [ 32.961585] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 32.968940] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.975146] Modules linked in: [ 32.978317] CPU: 1 PID: 6330 Comm: syz-executor005 Not tainted 4.14.181-syzkaller #0 [ 32.986195] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.995524] task: ffff8880a07ec2c0 task.stack: ffff888082350000 [ 33.001607] RIP: 0010:fq_codel_enqueue+0x94b/0x1050 [ 33.006594] RSP: 0018:ffff888082357650 EFLAGS: 00010246 [ 33.011952] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88808668b0c0 [ 33.019206] RDX: 0000000000000000 RSI: ffff8880823577e0 RDI: 0000000000000000 [ 33.026455] RBP: ffff888082357730 R08: ffff88821fff705c R09: ffff88821fff7048 [ 33.033712] R10: ffff88821fff7050 R11: 00000008fd9c5d65 R12: ffff8880823577e0 [ 33.040975] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888086680180 [ 33.048228] FS: 0000000002039880(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 [ 33.056428] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.062283] CR2: 000055b4cc769270 CR3: 00000000a641f000 CR4: 00000000001406e0 [ 33.069530] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.076774] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.084017] Call Trace: [ 33.086586] ? drop_func+0x60/0x60 [ 33.090120] __dev_queue_xmit+0x13c6/0x25a0 [ 33.094427] ? netdev_pick_tx+0x2e0/0x2e0 [ 33.098549] ? __phys_addr_symbol+0x1f/0x60 [ 33.102847] ? __check_object_size+0x176/0x229 [ 33.107405] ? skb_copy_datagram_from_iter+0x3c1/0x5f0 [ 33.112654] ? _copy_from_iter_full+0x1c7/0x680 [ 33.117298] ? packet_snd.isra.0+0x135f/0x20b0 [ 33.121869] packet_snd.isra.0+0x135f/0x20b0 [ 33.126271] ? compat_packet_setsockopt+0x140/0x140 [ 33.131295] ? __lock_acquire+0x655/0x42a0 [ 33.135523] ? __lock_acquire+0x655/0x42a0 [ 33.139736] packet_sendmsg+0xfd2/0x2340 [ 33.143774] ? __lock_acquire+0x655/0x42a0 [ 33.147985] ? trace_hardirqs_on+0x10/0x10 [ 33.152254] ? static_obj+0x50/0x50 [ 33.155881] ? sock_has_perm+0x1c0/0x230 [ 33.159929] ? selinux_tun_dev_create+0xc0/0xc0 [ 33.164629] ? avc_has_perm+0x130/0x320 [ 33.168580] ? packet_lookup_frame+0x240/0x240 [ 33.173190] ? security_socket_sendmsg+0x83/0xb0 [ 33.177921] ? packet_lookup_frame+0x240/0x240 [ 33.182527] sock_sendmsg+0xb5/0x100 [ 33.186217] sock_write_iter+0x22c/0x370 [ 33.190253] ? sock_sendmsg+0x100/0x100 [ 33.194204] ? inode_has_perm.isra.0+0x153/0x1d0 [ 33.198933] ? iov_iter_init+0xa6/0x1c0 [ 33.202882] __vfs_write+0x44e/0x630 [ 33.206585] ? kernel_read+0x110/0x110 [ 33.210448] ? selinux_file_permission+0x7a/0x440 [ 33.215264] ? rw_verify_area+0xe1/0x290 [ 33.219296] vfs_write+0x17f/0x4d0 [ 33.222826] SyS_write+0xf2/0x210 [ 33.226271] ? SyS_read+0x210/0x210 [ 33.229875] ? do_syscall_64+0x4c/0x640 [ 33.233822] ? SyS_read+0x210/0x210 [ 33.237422] do_syscall_64+0x1d5/0x640 [ 33.241288] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 33.246451] RIP: 0033:0x440599 [ 33.249615] RSP: 002b:00007fffe2e19b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 33.257313] RAX: ffffffffffffffda RBX: 00000000004a173e RCX: 0000000000440599 [ 33.264561] RDX: 000000000000006c RSI: 00000000200003c0 RDI: 0000000000000005 [ 33.271819] RBP: 54c6c2ff093a6d32 R08: 00000000004002c8 R09: 00000000004002c8 [ 33.279181] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000010000 [ 33.286435] R13: 0000000000401eb0 R14: 0000000000000000 R15: 0000000000000000 [ 33.293684] Code: 8b 54 24 68 3b 54 24 60 0f 83 bf 00 00 00 e8 8d 41 43 fc 48 8b 44 24 40 80 38 00 0f 85 63 05 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 5b 05 00 00 48 8b 10 48 8d 78 28 49 89 17 [ 33.312942] RIP: fq_codel_enqueue+0x94b/0x1050 RSP: ffff888082357650 [ 33.319461] ---[ end trace 3f9b7a73f2b6579c ]--- [ 33.324235] Kernel panic - not syncing: Fatal exception in interrupt [ 33.332025] Kernel Offset: disabled [ 33.335641] Rebooting in 86400 seconds..