[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 87.418952][ T31] audit: type=1800 audit(1559980261.466:25): pid=12214 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 87.443593][ T31] audit: type=1800 audit(1559980261.496:26): pid=12214 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 87.479137][ T31] audit: type=1800 audit(1559980261.516:27): pid=12214 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 '10.128.0.87' (ECDSA) to the list of known hosts. 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 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 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 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 syzkaller login: [ 98.443541][T12500] ================================================================== [ 98.451668][T12500] BUG: KMSAN: uninit-value in _copy_to_user+0x1d6/0x1f0 [ 98.458617][T12500] CPU: 0 PID: 12500 Comm: syz-executor868 Not tainted 5.1.0+ #1 [ 98.466260][T12500] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.476322][T12500] Call Trace: [ 98.479642][T12500] dump_stack+0x191/0x1f0 [ 98.484009][T12500] kmsan_report+0x162/0x2d0 [ 98.488535][T12500] __msan_warning+0x75/0xe0 [ 98.493062][T12500] _copy_to_user+0x1d6/0x1f0 [ 98.497679][T12500] __vb2_perform_fileio+0x67b/0x22b0 [ 98.503034][T12500] vb2_read+0xf7/0x110 [ 98.507134][T12500] vb2_fop_read+0x475/0x640 [ 98.511682][T12500] ? vb2_fop_write+0x640/0x640 [ 98.516467][T12500] v4l2_read+0x274/0x4a0 [ 98.520738][T12500] ? video_unregister_device+0x140/0x140 [ 98.526387][T12500] __vfs_read+0x1a5/0xbe0 [ 98.530733][T12500] ? security_file_permission+0x51f/0x6e0 [ 98.536482][T12500] ? rw_verify_area+0x35e/0x580 [ 98.541360][T12500] vfs_read+0x359/0x6f0 [ 98.545541][T12500] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.551464][T12500] __se_sys_pread64+0x285/0x330 [ 98.556344][T12500] __x64_sys_pread64+0x56/0x70 [ 98.561154][T12500] do_syscall_64+0xbc/0xf0 [ 98.565612][T12500] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 98.571510][T12500] RIP: 0033:0x444f39 [ 98.575412][T12500] Code: e8 ac e8 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 0b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 98.595035][T12500] RSP: 002b:00007fff442203c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 [ 98.603458][T12500] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444f39 [ 98.611438][T12500] RDX: 00000000000000f3 RSI: 0000000020000240 RDI: 0000000000000003 [ 98.619422][T12500] RBP: 0000000000018064 R08: 00000000004002e0 R09: 00000000004002e0 [ 98.627407][T12500] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020d0 [ 98.635392][T12500] R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000 [ 98.643393][T12500] [ 98.645722][T12500] Uninit was created at: [ 98.649989][T12500] kmsan_internal_poison_shadow+0x92/0x150 [ 98.655812][T12500] kmsan_kmalloc+0xa4/0x130 [ 98.660323][T12500] kmsan_slab_alloc+0xe/0x10 [ 98.664928][T12500] __kmalloc_node_track_caller+0xcba/0xf30 [ 98.670749][T12500] __alloc_skb+0x306/0xa10 [ 98.675174][T12500] sk_stream_alloc_skb+0x175/0xca0 [ 98.680289][T12500] tcp_sendmsg_locked+0x2a48/0x6c30 [ 98.685492][T12500] tcp_sendmsg+0xb2/0x100 [ 98.689831][T12500] inet_sendmsg+0x546/0x720 [ 98.694349][T12500] sock_write_iter+0x3f3/0x4e0 [ 98.699118][T12500] __vfs_write+0x95a/0xc10 [ 98.703536][T12500] vfs_write+0x481/0x920 [ 98.707781][T12500] ksys_write+0x1c5/0x440 [ 98.712114][T12500] __se_sys_write+0x92/0xb0 [ 98.716618][T12500] __x64_sys_write+0x4a/0x70 [ 98.721217][T12500] do_syscall_64+0xbc/0xf0 [ 98.725641][T12500] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 98.731529][T12500] ================================================================== [ 98.739589][T12500] Disabling lock debugging due to kernel taint [ 98.745744][T12500] Kernel panic - not syncing: panic_on_warn set ... [ 98.752342][T12500] CPU: 0 PID: 12500 Comm: syz-executor868 Tainted: G B 5.1.0+ #1 [ 98.761362][T12500] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.771433][T12500] Call Trace: [ 98.774778][T12500] dump_stack+0x191/0x1f0 [ 98.779133][T12500] panic+0x3ca/0xafe [ 98.783090][T12500] kmsan_report+0x2ca/0x2d0 [ 98.787619][T12500] __msan_warning+0x75/0xe0 [ 98.792140][T12500] _copy_to_user+0x1d6/0x1f0 [ 98.796758][T12500] __vb2_perform_fileio+0x67b/0x22b0 [ 98.802108][T12500] vb2_read+0xf7/0x110 [ 98.806212][T12500] vb2_fop_read+0x475/0x640 [ 98.810751][T12500] ? vb2_fop_write+0x640/0x640 [ 98.815532][T12500] v4l2_read+0x274/0x4a0 [ 98.819804][T12500] ? video_unregister_device+0x140/0x140 [ 98.825450][T12500] __vfs_read+0x1a5/0xbe0 [ 98.829798][T12500] ? security_file_permission+0x51f/0x6e0 [ 98.835547][T12500] ? rw_verify_area+0x35e/0x580 [ 98.840429][T12500] vfs_read+0x359/0x6f0 [ 98.844616][T12500] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 98.850531][T12500] __se_sys_pread64+0x285/0x330 [ 98.855413][T12500] __x64_sys_pread64+0x56/0x70 [ 98.860193][T12500] do_syscall_64+0xbc/0xf0 [ 98.864631][T12500] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 98.870535][T12500] RIP: 0033:0x444f39 [ 98.874437][T12500] Code: e8 ac e8 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 0b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 98.894057][T12500] RSP: 002b:00007fff442203c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 [ 98.902489][T12500] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444f39 [ 98.910471][T12500] RDX: 00000000000000f3 RSI: 0000000020000240 RDI: 0000000000000003 [ 98.918462][T12500] RBP: 0000000000018064 R08: 00000000004002e0 R09: 00000000004002e0 [ 98.926439][T12500] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020d0 [ 98.934426][T12500] R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000 [ 98.943524][T12500] Kernel Offset: disabled [ 98.947863][T12500] Rebooting in 86400 seconds..