INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-next-kasan-gce-4,10.128.15.220' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 31.056723] BUG: unable to handle kernel paging request at ffffc900016f4000 [ 31.063839] IP: snd_seq_oss_readq_puts+0x146/0x210 [ 31.068742] PGD 1dac75067 P4D 1dac75067 PUD 1dac76067 PMD 1c1cd3067 PTE 0 [ 31.075655] Oops: 0000 [#1] SMP KASAN [ 31.079419] Dumping ftrace buffer: [ 31.082920] (ftrace buffer empty) [ 31.086592] Modules linked in: [ 31.089752] CPU: 0 PID: 3012 Comm: syzkaller659314 Not tainted 4.14.0-rc1-next-20170918+ #24 [ 31.098286] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.107605] task: ffff8801ce930000 task.stack: ffff8801ce650000 [ 31.113631] RIP: 0010:snd_seq_oss_readq_puts+0x146/0x210 [ 31.119045] RSP: 0018:ffff8801ce657208 EFLAGS: 00010246 [ 31.124374] RAX: ffffed0039ccae4a RBX: ffffc900016f4000 RCX: ffff8801ce657251 [ 31.131614] RDX: 0000000000000000 RSI: 1ffff10039d26117 RDI: 0000000000000282 [ 31.138854] RBP: ffff8801ce6572b8 R08: ffff8801d807ab50 R09: 0000000000000000 [ 31.146087] R10: 0000000000000000 R11: 0000000000000000 R12: 000000003fffffa4 [ 31.153328] R13: ffff8801ce657290 R14: ffffc900016f4001 R15: dffffc0000000000 [ 31.160569] FS: 00007f9079b19700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.168758] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.174605] CR2: ffffc900016f4000 CR3: 00000001ce47d000 CR4: 00000000001406f0 [ 31.181842] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.189077] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.196313] Call Trace: [ 31.198874] ? snd_seq_oss_readq_put_event+0x240/0x240 [ 31.204116] ? trace_hardirqs_on+0xd/0x10 [ 31.208231] ? find_slot+0x11d/0x150 [ 31.211912] snd_seq_oss_midi_input+0xd39/0x1040 [ 31.216635] ? do_raw_spin_trylock+0x190/0x190 [ 31.221189] ? snd_seq_oss_midi_get_addr+0x170/0x170 [ 31.226260] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 31.231332] ? snd_seq_oss_process_event+0x2570/0x2570 [ 31.236572] snd_seq_oss_event_input+0x15d/0x220 [ 31.241294] snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 [ 31.247584] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 31.252735] ? queueptr+0x79/0xa0 [ 31.256159] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 31.261055] ? update_timestamp_of_queue+0x14d/0x200 [ 31.266123] snd_seq_deliver_event+0x318/0x790 [ 31.270672] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 31.277132] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.282114] ? snd_seq_client_use_ptr+0x85/0x330 [ 31.286834] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 31.292161] dummy_input+0x2c4/0x400 [ 31.295841] ? dummy_free+0x20/0x20 [ 31.299434] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 31.304068] ? dummy_free+0x20/0x20 [ 31.307659] snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 [ 31.313942] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 31.319094] ? snd_seq_client_use_ptr+0x3c/0x330 [ 31.323829] snd_seq_deliver_event+0x12c/0x790 [ 31.328376] ? do_raw_spin_trylock+0x190/0x190 [ 31.332927] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 31.339383] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 31.344450] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.349430] ? trace_hardirqs_on+0xd/0x10 [ 31.353542] ? snd_seq_client_use_ptr+0x85/0x330 [ 31.358264] snd_seq_dispatch_event+0x105/0x5b0 [ 31.362898] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 31.367964] ? snd_seq_kernel_client_dispatch+0x150/0x150 [ 31.373463] ? trace_hardirqs_on+0xd/0x10 [ 31.377585] snd_seq_check_queue.part.3+0x38e/0x510 [ 31.382572] snd_seq_enqueue_event+0x32d/0x3d0 [ 31.387118] ? queueptr+0x79/0xa0 [ 31.390536] snd_seq_client_enqueue_event+0x21b/0x420 [ 31.395691] ? snd_seq_deliver_event+0x790/0x790 [ 31.400408] ? trace_hardirqs_on+0xd/0x10 [ 31.404520] ? snd_seq_client_use_ptr+0x85/0x330 [ 31.409242] kernel_client_enqueue.part.10+0xb5/0xd0 [ 31.414311] snd_seq_kernel_client_enqueue_blocking+0xcf/0x110 [ 31.420248] snd_seq_oss_write+0x5fe/0xa80 [ 31.424446] ? __fget+0x362/0x580 [ 31.427865] ? snd_seq_oss_read+0x3e0/0x3e0 [ 31.432158] odev_write+0x64/0x90 [ 31.435575] ? odev_poll+0x80/0x80 [ 31.439078] __vfs_write+0xef/0x970 [ 31.442670] ? kernel_read+0x120/0x120 [ 31.446521] ? __might_sleep+0x95/0x190 [ 31.450465] ? __inode_security_revalidate+0xd9/0x130 [ 31.455622] ? avc_policy_seqno+0x9/0x20 [ 31.459644] ? selinux_file_permission+0x82/0x460 [ 31.464453] ? security_file_permission+0x89/0x1f0 [ 31.469348] ? rw_verify_area+0xe5/0x2b0 [ 31.473371] ? __fdget_raw+0x20/0x20 [ 31.477050] vfs_write+0x18f/0x510 [ 31.480554] SyS_write+0xef/0x220 [ 31.483969] ? lockdep_sys_exit+0x47/0xf0 [ 31.488084] ? SyS_read+0x220/0x220 [ 31.491673] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.496655] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.501389] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 31.506120] RIP: 0033:0x446469 [ 31.509274] RSP: 002b:00007f9079b18dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 31.516946] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446469 [ 31.524184] RDX: 0000000000000150 RSI: 0000000020e7f000 RDI: 0000000000000003 [ 31.531419] RBP: 0000000000000082 R08: 00007f9079b19700 R09: 00007f9079b19700 [ 31.538653] R10: 00007f9079b19700 R11: 0000000000000246 R12: 0000000000000000 [ 31.545889] R13: 00007ffe543fcc1f R14: 00007f9079b199c0 R15: 0000000000000000 [ 31.553131] Code: d9 4c 8d 73 01 48 c1 e8 03 83 e1 07 42 0f b6 04 38 38 c8 7f 08 84 c0 0f 85 bf 00 00 00 48 8b 85 58 ff ff ff 48 8b 8d 68 ff ff ff <41> 0f b6 5e ff 0f b6 00 83 e1 07 38 c8 7f 08 84 c0 0f 85 89 00 [ 31.572198] RIP: snd_seq_oss_readq_puts+0x146/0x210 RSP: ffff8801ce657208 [ 31.579091] CR2: ffffc900016f4000 [ 31.582515] ---[ end trace cc8c763aca15dec8 ]--- [ 31.587232] Kernel panic - not syncing: Fatal exception [ 31.592585] Dumping ftrace buffer: [ 31.596093] (ftrace buffer empty) [ 31.599769] Kernel Offset: disabled [ 31.603362] Rebooting in 86400 seconds..