INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-android-49-kasan-gce-1,10.128.0.14' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 34.850568] BUG: unable to handle kernel paging request at ffffc900008ab000 [ 34.851664] IP: [] snd_seq_oss_readq_puts+0xd5/0x170 [ 34.852599] PGD 1da091067 [ 34.852958] PUD 1da092067 PMD 1cd9ba067 [ 34.853547] PTE 0 [ 34.853843] [ 34.854071] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.854690] Dumping ftrace buffer: [ 34.855162] (ftrace buffer empty) [ 34.855691] Modules linked in: [ 34.856157] CPU: 1 PID: 3264 Comm: syzkaller504106 Not tainted 4.9.50-gf7d2974 #47 [ 34.857162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.858389] task: ffff8801cdd9e000 task.stack: ffff8801ce648000 [ 34.859182] RIP: 0010:[] [] snd_seq_oss_readq_puts+0xd5/0x170 [ 34.860409] RSP: 0018:ffff8801ce64f1c0 EFLAGS: 00010246 [ 34.861148] RAX: 0000000000000000 RBX: ffffc900008ab000 RCX: 0000000000000000 [ 34.862097] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff858e5780 [ 34.863047] RBP: ffff8801ce64f260 R08: 0000000000000000 R09: 0000000000000000 [ 34.863996] R10: 0000000000000000 R11: 1ffff10039cc9df2 R12: 000000003fffffa4 [ 34.864946] R13: dffffc0000000000 R14: ffff8801ce64f238 R15: ffffc900008ab001 [ 34.865900] FS: 00007fe3d3d9e700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.866991] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.867764] CR2: ffffc900008ab000 CR3: 00000001d19b7000 CR4: 00000000001406e0 [ 34.868717] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.869669] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.870616] Stack: [ 34.872518] 1ffff10039cc9e3b ffff8801ce64f1f8 ffff8801d0b9aa00 0000000041b58ab3 [ 34.880468] ffffffff841daf3c ffffffff82e2fb30 0000000000000286 0000000000000005 [ 34.888413] ffffffff838aa5d5 ffffffff861962c0 dffffc0000000000 ffff8801ce64f260 [ 34.896359] Call Trace: [ 34.898912] [] ? snd_seq_oss_readq_put_event+0x240/0x240 [ 34.905978] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 34.912868] [] ? find_slot+0x11d/0x150 [ 34.918370] [] snd_seq_oss_midi_input+0x8ce/0xa70 [ 34.924823] [] ? snd_seq_oss_midi_get_addr+0x170/0x170 [ 34.931712] [] ? snd_seq_port_use_ptr+0x44/0x1c0 [ 34.938078] [] ? snd_seq_port_use_ptr+0x183/0x1c0 [ 34.944534] [] ? snd_seq_oss_process_event+0x2c60/0x2c60 [ 34.951595] [] snd_seq_oss_event_input+0x15d/0x220 [ 34.958138] [] snd_seq_deliver_single_event.constprop.11+0x310/0x7c0 [ 34.966240] [] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 34.973216] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 34.980101] [] ? queueptr+0x79/0xa0 [ 34.985339] [] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 34.992054] [] ? update_timestamp_of_queue+0x14d/0x200 [ 34.998940] [] snd_seq_deliver_event+0x316/0x740 [ 35.005307] [] ? snd_seq_deliver_single_event.constprop.11+0x7c0/0x7c0 [ 35.013590] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 35.020479] [] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 35.027642] [] dummy_input+0x235/0x320 [ 35.033142] [] ? dummy_free+0x20/0x20 [ 35.038554] [] ? _raw_read_unlock+0x2c/0x50 [ 35.044485] [] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 35.050936] [] ? dummy_free+0x20/0x20 [ 35.056348] [] snd_seq_deliver_single_event.constprop.11+0x310/0x7c0 [ 35.064540] [] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 35.071517] [] ? snd_seq_cell_alloc.isra.1+0xfb/0x580 [ 35.078322] [] snd_seq_deliver_event+0x12d/0x740 [ 35.084692] [] ? snd_seq_deliver_single_event.constprop.11+0x7c0/0x7c0 [ 35.092977] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 35.099865] [] snd_seq_dispatch_event+0x11d/0x520 [ 35.106781] [] ? snd_seq_prioq_cell_out+0x2d/0x140 [ 35.113324] [] ? snd_seq_kernel_client_dispatch+0x150/0x150 [ 35.120652] [] ? snd_seq_prioq_cell_out+0xe8/0x140 [ 35.127197] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 35.134087] [] snd_seq_check_queue.part.3+0x38e/0x510 [ 35.140888] [] snd_seq_enqueue_event+0x32d/0x3d0 [ 35.147255] [] ? queueptr+0x79/0xa0 [ 35.152492] [] snd_seq_client_enqueue_event+0x204/0x3e0 [ 35.159467] [] ? snd_seq_deliver_event+0x740/0x740 [ 35.166008] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 35.172895] [] kernel_client_enqueue.part.10+0xb5/0xd0 [ 35.179792] [] snd_seq_kernel_client_enqueue_blocking+0xcf/0x110 [ 35.187551] [] snd_seq_oss_write+0x538/0x850 [ 35.193578] [] ? snd_seq_oss_read+0x3e0/0x3e0 [ 35.199687] [] odev_write+0x64/0x90 [ 35.204929] [] ? odev_poll+0x80/0x80 [ 35.210266] [] __vfs_write+0x103/0x680 [ 35.215767] [] ? lru_cache_add+0xd9/0x1e0 [ 35.221536] [] ? default_llseek+0x290/0x290 [ 35.227472] [] ? __might_sleep+0x95/0x1a0 [ 35.233235] [] ? __inode_security_revalidate+0xd9/0x130 [ 35.240221] [] ? avc_policy_seqno+0x9/0x20 [ 35.246070] [] ? selinux_file_permission+0x82/0x460 [ 35.252699] [] ? security_file_permission+0x89/0x1e0 [ 35.259416] [] ? rw_verify_area+0xe5/0x2b0 [ 35.265265] [] vfs_write+0x170/0x4e0 [ 35.270593] [] SyS_write+0xd9/0x1b0 [ 35.275832] [] ? SyS_read+0x1b0/0x1b0 [ 35.281248] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 35.287791] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 35.294333] Code: 4d 9a eb 4e e8 2d aa 53 fe 4c 8d 7b 01 48 89 d8 48 89 d9 48 c1 e8 03 83 e1 07 42 0f b6 04 28 38 c8 7f 08 84 c0 0f 85 80 00 00 00 <41> 0f b6 47 ff 41 83 ec 01 48 8b b5 68 ff ff ff 48 8b bd 70 ff [ 35.320600] RIP [] snd_seq_oss_readq_puts+0xd5/0x170 [ 35.327429] RSP [ 35.331016] CR2: ffffc900008ab000 [ 35.334436] ---[ end trace 907902423b363f73 ]--- [ 35.339152] Kernel panic - not syncing: Fatal exception [ 35.344508] Dumping ftrace buffer: [ 35.348013] (ftrace buffer empty) [ 35.351687] Kernel Offset: disabled [ 35.355277] Rebooting in 86400 seconds..