[ OK ] Started OpenBSD Secure Shell server. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 111.514594][ T8471] ===================================================== [ 111.521641][ T8471] BUG: KMSAN: uninit-value in kmsan_check_memory+0xd/0x10 [ 111.528725][ T8471] CPU: 0 PID: 8471 Comm: syz-executor794 Not tainted 5.8.0-rc5-syzkaller #0 [ 111.537376][ T8471] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 111.547402][ T8471] Call Trace: [ 111.550668][ T8471] dump_stack+0x1df/0x240 [ 111.554972][ T8471] kmsan_report+0xf7/0x1e0 [ 111.559364][ T8471] kmsan_internal_check_memory+0x238/0x3d0 [ 111.565141][ T8471] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 111.571269][ T8471] kmsan_check_memory+0xd/0x10 [ 111.576005][ T8471] _copy_to_user+0x100/0x1d0 [ 111.580572][ T8471] video_usercopy+0x248a/0x2c00 [ 111.585419][ T8471] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 111.591459][ T8471] ? do_vfs_ioctl+0x10c7/0x2f50 [ 111.596277][ T8471] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 111.602059][ T8471] video_ioctl2+0x9f/0xb0 [ 111.606362][ T8471] ? video_usercopy+0x2c00/0x2c00 [ 111.611359][ T8471] v4l2_ioctl+0x23f/0x270 [ 111.615674][ T8471] ? v4l2_poll+0x400/0x400 [ 111.620064][ T8471] __se_sys_ioctl+0x2e9/0x410 [ 111.624719][ T8471] __x64_sys_ioctl+0x4a/0x70 [ 111.629286][ T8471] do_syscall_64+0xb0/0x150 [ 111.633767][ T8471] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 111.639628][ T8471] RIP: 0033:0x444009 [ 111.643487][ T8471] Code: Bad RIP value. [ 111.647522][ T8471] RSP: 002b:00007ffd83706aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 111.655906][ T8471] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444009 [ 111.663850][ T8471] RDX: 0000000020000100 RSI: 00000000c0505611 RDI: 0000000000000003 [ 111.671823][ T8471] RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 [ 111.679768][ T8471] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401c90 [ 111.687713][ T8471] R13: 0000000000401d20 R14: 0000000000000000 R15: 0000000000000000 [ 111.695663][ T8471] [ 111.697967][ T8471] Local variable ----vb32.i@video_usercopy created at: [ 111.704792][ T8471] video_usercopy+0x20bd/0x2c00 [ 111.709614][ T8471] video_usercopy+0x20bd/0x2c00 [ 111.714544][ T8471] [ 111.716859][ T8471] Bytes 52-55 of 80 are uninitialized [ 111.722211][ T8471] Memory access of size 80 starts at ffffa41d80dcfce0 [ 111.728944][ T8471] ===================================================== [ 111.735849][ T8471] Disabling lock debugging due to kernel taint [ 111.741969][ T8471] Kernel panic - not syncing: panic_on_warn set ... [ 111.748531][ T8471] CPU: 0 PID: 8471 Comm: syz-executor794 Tainted: G B 5.8.0-rc5-syzkaller #0 [ 111.758558][ T8471] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 111.768595][ T8471] Call Trace: [ 111.771994][ T8471] dump_stack+0x1df/0x240 [ 111.776309][ T8471] panic+0x3d5/0xc3e [ 111.780190][ T8471] kmsan_report+0x1df/0x1e0 [ 111.784668][ T8471] kmsan_internal_check_memory+0x238/0x3d0 [ 111.790449][ T8471] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 111.796593][ T8471] kmsan_check_memory+0xd/0x10 [ 111.801332][ T8471] _copy_to_user+0x100/0x1d0 [ 111.805900][ T8471] video_usercopy+0x248a/0x2c00 [ 111.810744][ T8471] ? __msan_metadata_ptr_for_load_2+0x10/0x20 [ 111.816786][ T8471] ? do_vfs_ioctl+0x10c7/0x2f50 [ 111.821612][ T8471] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 111.827446][ T8471] video_ioctl2+0x9f/0xb0 [ 111.831789][ T8471] ? video_usercopy+0x2c00/0x2c00 [ 111.836787][ T8471] v4l2_ioctl+0x23f/0x270 [ 111.841089][ T8471] ? v4l2_poll+0x400/0x400 [ 111.845476][ T8471] __se_sys_ioctl+0x2e9/0x410 [ 111.850150][ T8471] __x64_sys_ioctl+0x4a/0x70 [ 111.854731][ T8471] do_syscall_64+0xb0/0x150 [ 111.859222][ T8471] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 111.865088][ T8471] RIP: 0033:0x444009 [ 111.868957][ T8471] Code: Bad RIP value. [ 111.872995][ T8471] RSP: 002b:00007ffd83706aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 111.881376][ T8471] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444009 [ 111.889320][ T8471] RDX: 0000000020000100 RSI: 00000000c0505611 RDI: 0000000000000003 [ 111.897266][ T8471] RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 [ 111.905210][ T8471] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401c90 [ 111.913154][ T8471] R13: 0000000000401d20 R14: 0000000000000000 R15: 0000000000000000 [ 111.922509][ T8471] Kernel Offset: 0x14800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 111.934118][ T8471] Rebooting in 86400 seconds..