[ 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 '10.128.1.99' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 29.849022] IPVS: ftp: loaded support on port[0] = 21 [ 29.882821] IPVS: ftp: loaded support on port[0] = 21 [ 29.883007] vhci_hcd vhci_hcd.0: pdev(0) rhport(0) sockfd(3) [ 29.894028] vhci_hcd vhci_hcd.0: devid(0) speed(5) speed_str(super-speed) [ 29.901169] vhci_hcd: connection closed [ 29.902648] vhci_hcd: stop threads [ 29.910344] kasan: CONFIG_KASAN_INLINE enabled [ 29.912711] vhci_hcd: release socket [ 29.914920] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.914933] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.914937] Modules linked in: [ 29.914950] CPU: 1 PID: 7988 Comm: syz-executor241 Not tainted 4.14.226-syzkaller #0 [ 29.919426] vhci_hcd: disconnect device [ 29.926036] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.926043] task: ffff8880b3ec86c0 task.stack: ffff8880982c0000 [ 29.926057] RIP: 0010:__lock_acquire+0x1cc/0x3f20 [ 29.926060] RSP: 0018:ffff8880982c7868 EFLAGS: 00010006 [ 29.926065] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 29.926068] RDX: 00000000000000fc RSI: 0000000000000000 RDI: 00000000000007e0 [ 29.926071] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 [ 29.926074] R10: 0000000000000001 R11: ffff8880b3ec86c0 R12: 00000000000007e0 [ 29.926077] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8beb5d40 [ 29.926082] FS: 00007f8daf55b700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 29.926086] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.926089] CR2: 00000000004b2768 CR3: 00000000aad24000 CR4: 00000000001406e0 [ 29.926095] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.926098] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.926100] Call Trace: [ 29.926112] ? mark_held_locks+0xa6/0xf0 [ 29.926121] ? _raw_spin_unlock_irq+0x24/0x80 [ 29.926127] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 29.926133] ? _raw_spin_unlock_irq+0x5a/0x80 [ 29.926144] ? finish_task_switch+0x178/0x610 [ 30.070111] ? finish_task_switch+0x14d/0x610 [ 30.074608] ? trace_hardirqs_on+0x10/0x10 [ 30.078840] ? __schedule+0x893/0x1de0 [ 30.082713] ? io_schedule_timeout+0x140/0x140 [ 30.087298] lock_acquire+0x170/0x3f0 [ 30.091085] ? try_to_wake_up+0x6a/0x1100 [ 30.095222] _raw_spin_lock_irqsave+0x8c/0xc0 [ 30.099720] ? try_to_wake_up+0x6a/0x1100 [ 30.103854] try_to_wake_up+0x6a/0x1100 [ 30.107836] ? migrate_swap_stop+0x880/0x880 [ 30.112238] store_attach+0x577/0x990 [ 30.116038] ? valid_port+0x180/0x180 [ 30.119837] ? add_lock_to_list.constprop.0+0x17d/0x330 [ 30.125195] ? kernfs_fop_write+0x1d9/0x440 [ 30.129501] ? valid_port+0x180/0x180 [ 30.133282] dev_attr_store+0x56/0x80 [ 30.137068] ? component_del+0x500/0x500 [ 30.141122] sysfs_kf_write+0x106/0x160 [ 30.145083] ? sysfs_file_ops+0x190/0x190 [ 30.149227] kernfs_fop_write+0x289/0x440 [ 30.153361] __vfs_write+0xe4/0x630 [ 30.156988] ? kernfs_vma_page_mkwrite+0x230/0x230 [ 30.161954] ? debug_check_no_obj_freed+0x2c0/0x680 [ 30.166972] ? kernel_read+0x110/0x110 [ 30.170848] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 30.176300] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 30.181309] vfs_write+0x17f/0x4d0 [ 30.184841] SyS_write+0xf2/0x210 [ 30.188276] ? SyS_read+0x210/0x210 [ 30.191913] ? __do_page_fault+0x159/0xad0 [ 30.196141] ? do_syscall_64+0x4c/0x640 [ 30.200113] ? SyS_read+0x210/0x210 [ 30.203720] do_syscall_64+0x1d5/0x640 [ 30.207589] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.212758] RIP: 0033:0x40684f [ 30.215944] RSP: 002b:00007f8daf55ad60 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [ 30.223652] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 000000000040684f [ 30.230901] RDX: 0000000000000007 RSI: 00007f8daf55adb0 RDI: 0000000000000005 [ 30.238168] RBP: 0000000000000005 R08: 0000000000000000 R09: 00007f8daf55ad00 [ 30.245434] R10: 0000000000000000 R11: 0000000000000293 R12: 00007f8daf55adb0 [ 30.252684] R13: 0000000000000000 R14: 00007f8daf55b400 R15: 0000000000022000 [ 30.259936] Code: 18 00 00 00 00 48 81 c4 80 01 00 00 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 67 2a 00 00 49 81 3c 24 a0 17 2e 8b 0f 84 5f [ 30.278994] RIP: __lock_acquire+0x1cc/0x3f20 RSP: ffff8880982c7868 [ 30.285343] ---[ end trace d85b11c131318e26 ]--- [ 30.290079] Kernel panic - not syncing: Fatal exception [ 30.295832] Kernel Offset: disabled [ 30.299474] Rebooting in 86400 seconds..