[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.899037] audit: type=1800 audit(1541249357.941:25): pid=6396 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.918237] audit: type=1800 audit(1541249357.941:26): pid=6396 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 63.938191] audit: type=1800 audit(1541249357.971:27): pid=6396 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] 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 '10.128.10.4' (ECDSA) to the list of known hosts. syzkaller login: [ 75.825514] IPVS: ftp: loaded support on port[0] = 21 [ 75.836474] IPVS: ftp: loaded support on port[0] = 21 [ 75.843323] IPVS: ftp: loaded support on port[0] = 21 [ 75.860101] IPVS: ftp: loaded support on port[0] = 21 [ 75.862248] IPVS: ftp: loaded support on port[0] = 21 [ 75.872389] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 76.976601] ================================================================== [ 76.984041] BUG: KMSAN: uninit-value in vb2_mmap+0xb2c/0xc90 [ 76.989869] CPU: 1 PID: 6655 Comm: syz-executor291 Not tainted 4.19.0+ #77 [ 76.996884] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.006230] Call Trace: [ 77.008813] dump_stack+0x32d/0x480 [ 77.012434] ? _raw_spin_lock_irqsave+0x237/0x340 [ 77.017273] ? vb2_mmap+0xb2c/0xc90 [ 77.020905] kmsan_report+0x1a2/0x2e0 [ 77.024741] __msan_warning+0x74/0xd0 [ 77.028556] vb2_mmap+0xb2c/0xc90 [ 77.032046] vb2_fop_mmap+0xa9/0xd0 [ 77.035692] ? vb2_ioctl_expbuf+0x300/0x300 [ 77.040190] v4l2_mmap+0x212/0x400 [ 77.043782] ? v4l2_ioctl+0x270/0x270 [ 77.047612] mmap_region+0x3a21/0x4910 [ 77.051536] do_mmap+0x182d/0x1e60 [ 77.055122] vm_mmap_pgoff+0x328/0x450 [ 77.059071] ksys_mmap_pgoff+0xa3f/0xaf0 [ 77.063159] __se_sys_mmap+0x172/0x1a0 [ 77.067054] __x64_sys_mmap+0x69/0x90 [ 77.070862] do_syscall_64+0xcf/0x110 [ 77.074665] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 77.079848] RIP: 0033:0x44a279 [ 77.083034] Code: e8 cc e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 77.101963] RSP: 002b:00007f6b99a3bd98 EFLAGS: 00000212 ORIG_RAX: 0000000000000009 [ 77.109691] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 000000000044a279 [ 77.116965] RDX: 0000000000000001 RSI: 0000000000003000 RDI: 0000000020ffa000 [ 77.124230] RBP: 00000000006dbc20 R08: 0000000000000003 R09: 0000000000000000 [ 77.131499] R10: 0000000000001011 R11: 0000000000000212 R12: 00000000006dbc2c [ 77.138786] R13: 6469762f7665642f R14: 00007f6b99a3c9c0 R15: 0000000000000000 [ 77.146090] [ 77.147730] Uninit was created at: [ 77.151299] kmsan_internal_alloc_meta_for_pages+0x155/0x740 [ 77.157125] kmsan_alloc_page+0x77/0xe0 [ 77.161104] __alloc_pages_nodemask+0x12cc/0x6640 [ 77.165960] alloc_pages_current+0x584/0x7e0 [ 77.170360] new_slab+0x3c0/0x1f70 [ 77.173915] ___slab_alloc+0x12a7/0x1e40 [ 77.177966] __kmalloc_node_track_caller+0xe08/0x14e0 [ 77.183175] __alloc_skb+0x42b/0xeb0 [ 77.186882] inet_netconf_notify_devconf+0x219/0x450 [ 77.192005] __devinet_sysctl_register+0x673/0x780 [ 77.196939] devinet_sysctl_register+0x2ef/0x3a0 [ 77.201708] inetdev_init+0x4a6/0xb80 [ 77.205547] inetdev_event+0x69d/0x1d80 [ 77.209516] raw_notifier_call_chain+0x13d/0x240 [ 77.214266] register_netdevice+0x2164/0x26e0 [ 77.218754] register_netdev+0x93/0xd0 [ 77.222637] ip6gre_init_net+0x454/0x760 [ 77.226688] ops_init+0x2fe/0x760 [ 77.230132] setup_net+0x480/0x1240 [ 77.233755] copy_net_ns+0x7b5/0xb80 [ 77.237458] create_new_namespaces+0x9f8/0xed0 [ 77.242031] unshare_nsproxy_namespaces+0x280/0x360 [ 77.247039] ksys_unshare+0xa5a/0x1460 [ 77.250917] __se_sys_unshare+0x41/0x60 [ 77.254884] __x64_sys_unshare+0x32/0x50 [ 77.258935] do_syscall_64+0xcf/0x110 [ 77.262730] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 77.267903] ================================================================== [ 77.275246] Disabling lock debugging due to kernel taint [ 77.280697] Kernel panic - not syncing: panic_on_warn set ... [ 77.280697] [ 77.288074] CPU: 1 PID: 6655 Comm: syz-executor291 Tainted: G B 4.19.0+ #77 [ 77.296466] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.305809] Call Trace: [ 77.308390] dump_stack+0x32d/0x480 [ 77.312025] panic+0x57e/0xb28 [ 77.315270] kmsan_report+0x2d3/0x2e0 [ 77.319076] __msan_warning+0x74/0xd0 [ 77.322879] vb2_mmap+0xb2c/0xc90 [ 77.326342] vb2_fop_mmap+0xa9/0xd0 [ 77.329960] ? vb2_ioctl_expbuf+0x300/0x300 [ 77.334283] v4l2_mmap+0x212/0x400 [ 77.337822] ? v4l2_ioctl+0x270/0x270 [ 77.341636] mmap_region+0x3a21/0x4910 [ 77.345583] do_mmap+0x182d/0x1e60 [ 77.349144] vm_mmap_pgoff+0x328/0x450 [ 77.353048] ksys_mmap_pgoff+0xa3f/0xaf0 [ 77.357117] __se_sys_mmap+0x172/0x1a0 [ 77.361011] __x64_sys_mmap+0x69/0x90 [ 77.364807] do_syscall_64+0xcf/0x110 [ 77.368604] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 77.373806] RIP: 0033:0x44a279 [ 77.377014] Code: e8 cc e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 77.395907] RSP: 002b:00007f6b99a3bd98 EFLAGS: 00000212 ORIG_RAX: 0000000000000009 [ 77.403609] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 000000000044a279 [ 77.410868] RDX: 0000000000000001 RSI: 0000000000003000 RDI: 0000000020ffa000 [ 77.418127] RBP: 00000000006dbc20 R08: 0000000000000003 R09: 0000000000000000 [ 77.425389] R10: 0000000000001011 R11: 0000000000000212 R12: 00000000006dbc2c [ 77.432649] R13: 6469762f7665642f R14: 00007f6b99a3c9c0 R15: 0000000000000000 [ 77.440842] Kernel Offset: disabled [ 77.444478] Rebooting in 86400 seconds..