[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 88.241902][ T30] audit: type=1800 audit(1560015424.285:25): pid=11763 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 88.268940][ T30] audit: type=1800 audit(1560015424.315:26): pid=11763 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 88.305756][ T30] audit: type=1800 audit(1560015424.345:27): pid=11763 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 '10.128.0.110' (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 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 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: [ 510.401164][T12229] ================================================================== [ 510.409464][T12229] BUG: KMSAN: uninit-value in _copy_to_user+0x1d6/0x1f0 [ 510.416394][T12229] CPU: 0 PID: 12229 Comm: syz-executor647 Not tainted 5.1.0+ #1 [ 510.424058][T12229] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 510.434111][T12229] Call Trace: [ 510.437519][T12229] dump_stack+0x191/0x1f0 [ 510.441964][T12229] kmsan_report+0x162/0x2d0 [ 510.446502][T12229] __msan_warning+0x75/0xe0 [ 510.451023][T12229] _copy_to_user+0x1d6/0x1f0 [ 510.455732][T12229] __vb2_perform_fileio+0x67b/0x22b0 [ 510.461149][T12229] vb2_read+0xf7/0x110 [ 510.465245][T12229] vb2_fop_read+0x475/0x640 [ 510.469781][T12229] ? vb2_fop_write+0x640/0x640 [ 510.474618][T12229] v4l2_read+0x274/0x4a0 [ 510.478874][T12229] ? video_unregister_device+0x140/0x140 [ 510.484562][T12229] __vfs_read+0x1a5/0xbe0 [ 510.488940][T12229] ? security_file_permission+0x51f/0x6e0 [ 510.494669][T12229] ? rw_verify_area+0x35e/0x580 [ 510.499523][T12229] vfs_read+0x359/0x6f0 [ 510.503678][T12229] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 510.509578][T12229] ksys_read+0x1c5/0x440 [ 510.513848][T12229] __se_sys_read+0x92/0xb0 [ 510.518278][T12229] __x64_sys_read+0x4a/0x70 [ 510.522850][T12229] do_syscall_64+0xbc/0xf0 [ 510.527339][T12229] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 510.533244][T12229] RIP: 0033:0x4453c9 [ 510.537143][T12229] 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 [ 510.556746][T12229] RSP: 002b:00007ffeb1cfa2c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 510.565166][T12229] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004453c9 [ 510.573158][T12229] RDX: 000000000000004b RSI: 0000000020000400 RDI: 0000000000000003 [ 510.581142][T12229] RBP: 000000000007c98c R08: 000000000007c98c R09: 00000000004025f0 [ 510.589120][T12229] R10: 00007ffeb1cf9e10 R11: 0000000000000246 R12: 0000000000402560 [ 510.597125][T12229] R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 [ 510.605166][T12229] [ 510.607492][T12229] Uninit was created at: [ 510.611751][T12229] kmsan_internal_poison_shadow+0x92/0x150 [ 510.617567][T12229] kmsan_kmalloc+0xa4/0x130 [ 510.622074][T12229] kmsan_slab_alloc+0xe/0x10 [ 510.626653][T12229] __kmalloc_node_track_caller+0xcba/0xf30 [ 510.632572][T12229] __alloc_skb+0x306/0xa10 [ 510.637058][T12229] sk_stream_alloc_skb+0x175/0xca0 [ 510.642214][T12229] tcp_sendmsg_locked+0x2a48/0x6c30 [ 510.647411][T12229] tcp_sendmsg+0xb2/0x100 [ 510.651775][T12229] inet_sendmsg+0x546/0x720 [ 510.656290][T12229] sock_write_iter+0x3f3/0x4e0 [ 510.661068][T12229] __vfs_write+0x95a/0xc10 [ 510.665495][T12229] vfs_write+0x481/0x920 [ 510.669760][T12229] ksys_write+0x1c5/0x440 [ 510.674089][T12229] __se_sys_write+0x92/0xb0 [ 510.678587][T12229] __x64_sys_write+0x4a/0x70 [ 510.683184][T12229] do_syscall_64+0xbc/0xf0 [ 510.687584][T12229] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 510.693456][T12229] ================================================================== [ 510.701736][T12229] Disabling lock debugging due to kernel taint [ 510.707884][T12229] Kernel panic - not syncing: panic_on_warn set ... [ 510.714479][T12229] CPU: 0 PID: 12229 Comm: syz-executor647 Tainted: G B 5.1.0+ #1 [ 510.723490][T12229] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 510.733557][T12229] Call Trace: [ 510.736902][T12229] dump_stack+0x191/0x1f0 [ 510.741353][T12229] panic+0x3ca/0xafe [ 510.745295][T12229] kmsan_report+0x2ca/0x2d0 [ 510.749827][T12229] __msan_warning+0x75/0xe0 [ 510.754358][T12229] _copy_to_user+0x1d6/0x1f0 [ 510.759017][T12229] __vb2_perform_fileio+0x67b/0x22b0 [ 510.764350][T12229] vb2_read+0xf7/0x110 [ 510.768459][T12229] vb2_fop_read+0x475/0x640 [ 510.772981][T12229] ? vb2_fop_write+0x640/0x640 [ 510.778303][T12229] v4l2_read+0x274/0x4a0 [ 510.785139][T12229] ? video_unregister_device+0x140/0x140 [ 510.790858][T12229] __vfs_read+0x1a5/0xbe0 [ 510.795211][T12229] ? security_file_permission+0x51f/0x6e0 [ 510.800933][T12229] ? rw_verify_area+0x35e/0x580 [ 510.805807][T12229] vfs_read+0x359/0x6f0 [ 510.809997][T12229] ? kmsan_get_shadow_origin_ptr+0x71/0x470 [ 510.815926][T12229] ksys_read+0x1c5/0x440 [ 510.820194][T12229] __se_sys_read+0x92/0xb0 [ 510.824627][T12229] __x64_sys_read+0x4a/0x70 [ 510.829161][T12229] do_syscall_64+0xbc/0xf0 [ 510.833580][T12229] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 510.839470][T12229] RIP: 0033:0x4453c9 [ 510.843365][T12229] 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 [ 510.862995][T12229] RSP: 002b:00007ffeb1cfa2c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 510.871426][T12229] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004453c9 [ 510.879412][T12229] RDX: 000000000000004b RSI: 0000000020000400 RDI: 0000000000000003 [ 510.887561][T12229] RBP: 000000000007c98c R08: 000000000007c98c R09: 00000000004025f0 [ 510.895545][T12229] R10: 00007ffeb1cf9e10 R11: 0000000000000246 R12: 0000000000402560 [ 510.903516][T12229] R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 [ 510.912732][T12229] Kernel Offset: disabled [ 510.917334][T12229] Rebooting in 86400 seconds..