LHC@home

This has recently started happening (within the last few days).

The tasks all ends at about 25 seconds and the log shows the following in each case:

2024-02-02 6:51:06 AM | LHC@home | Output file Theory_2687-2563509-84_0_r635125659_result for task Theory_2687-2563509-84_0 absent

Any ideas what is happening?

Thanks

Please set a limit for Theory-Tasks in pref, before the reason is found.
You have successful Tasks in the last month.
Are there yellow triangle in vboxmanager?

A similar VirtualBox error has been described here together with steps to solve it:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=6079&postid=49046

Instead of the CMS vdi you need to cleanup the Theory vdi.

Thanks for the info, will give that a try.

I set my prefs for CMS only and the tasks download and run correctly so the issue seems to be with the Theory tasks.

I monitored the startup in Vbox and noticed that the instance would begin to start then it would fail and a cleanup would remove the files.

I did capture the vbox trace file to see what was happening and the following error pops up every time an instance tries to start:

Command: VBoxManage -q showvminfo "boinc_23c1e4f58830b1c0" --machinereadable
Exit Code: -2135228415
Output:
VBoxManage.exe: error: Could not find a registered machine named 'boinc_23c1e4f58830b1c0'
VBoxManage.exe: error: Details: code VBOX_E_OBJECT_NOT_FOUND (0x80bb0001), component VirtualBoxWrap, interface IVirtualBox, callee IUnknown
VBoxManage.exe: error: Context: "FindMachine(Bstr(VMNameOrUuid).raw(), machine.asOutParam())" at line 3139 of file VBoxManageInfo.cpp

2024-02-03 21:54:36 (12296):
Command: VBoxManage -q showhdinfo "D:\Program Data\BOINC\slots\0/vm_image.vdi"
Exit Code: -2135228412
Output:
VBoxManage.exe: error: Could not find file for the medium 'D:\Program Data\BOINC\slots\0\vm_image.vdi' (VERR_FILE_NOT_FOUND)
VBoxManage.exe: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component MediumWrap, interface IMedium, callee IUnknown
VBoxManage.exe: error: Context: "OpenMedium(Bstr(pszFilenameOrUuid).raw(), enmDevType, enmAccessMode, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 205 of file VBoxManageDisk.cpp

2024-02-03 21:54:36 (12296):
Command: VBoxManage -q createvm --name "boinc_23c1e4f58830b1c0" --basefolder "D:\Program Data\BOINC\slots\0" --ostype "Linux26_64" --register
Exit Code: 0

And later in the log:

2024-02-03 21:54:40 (12296):
Command: VBoxManage -q storageattach "boinc_23c1e4f58830b1c0" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "D:\Program Data\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2023_12_13.vdi"
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot attach medium 'D:\Program Data\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2023_12_13.vdi': the media type 'MultiAttach' can only be attached to machines that were created with VirtualBox 4.0 or later
VBoxManage.exe: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component SessionMachine, interface IMachine, callee IUnknown
VBoxManage.exe: error: Context: "AttachDevice(Bstr(pszCtl).raw(), port, device, DeviceType_HardDisk, pMedium2Mount)" at line 785 of file VBoxManageStorageController.cpp

2024-02-03 21:54:41 (12296):
Command: VBoxManage -q closemedium "D:\Program Data\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2023_12_13.vdi"
Exit Code: -2135228404
Output:
VBoxManage.exe: error: Cannot close medium 'D:\Program Data\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2023_12_13.vdi' because it has 1 child media
VBoxManage.exe: error: Details: code VBOX_E_OBJECT_IN_USE (0x80bb000c), component MediumWrap, interface IMedium, callee IUnknown
VBoxManage.exe: error: Context: "Close()" at line 1878 of file VBoxManageDisk.cpp

Since I have been doing Theory tasks in the past something must have changed but I have not made any changes to the host.

Ideas would be appreciated where to look.

Thanks

In your logs: "VBoxManage.exe: error: Cannot close medium 'D:\Program Data\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2023_12_13.vdi' because it has 1 child media"

Use VirtualBox Manager. Go to media and remove the Theory_2023_12_13.vdi description from the list, but keep the file itself.

Thank you for the direction.

That worked perfectly and I can now process Theory Tasks.

Something else to add to the Troubleshooting wallboard lol.

Every LHC task is failing at 00:00:08 with a computation error:
Tue Apr 30 15:27:54 2024 | LHC@home | Starting task CMS_860485_1714503592.613793_0
Tue Apr 30 15:28:05 2024 | LHC@home | Computation for task CMS_860485_1714503592.613793_0 finished
Any idea why this is happening?

Any idea why this is happening?

You have your machine(s) hidden, so we can't see the results

Visible now?

Yeah, visible now! Thanks.
On 1 machine I see child media. That are remnants of Virtual Machines that should been cleaned by BOINC's wrapper but didn't.
On the other machine you probably started several CMS-tasks at once and there I see an error not seen before, but maybe special for Darwin OS:

2024-04-30 21:47:48 (27867): Could not set race mitigation lock.
2024-04-30 21:47:48 (27867): Lockname: '/boinc_vboxwrapper_lock_c94b628801c684e7'
2024-04-30 21:47:48 (27867): Error: 63, File name too long
2024-04-30 21:47:48 (27867): Attempts: 1

The easiest way probably is on both machines to reset LHC@home project to start clean.
After the reset don't ask tasks immediately, but remove remnants from the VM's by using VirtualBox Manager
Right from Tools you see a pinned button. Select Media and remove all LHC related media and even delete related files, when asked.
To start with a first task, set in your project preferences only Theory and only 1 job.

For the second problem it's best to start VM-tasks with 1 minute interval.
That problem is solved for Windows and Linux OS, but it looks like Darwin has a problem with longer file names there.

Looks like on Darwin the lock name must not exceed 31 characters while Linux and Windows allow >250.
This can't be solved without a new vboxwrapper.

New versions are available for Theory and CMS with the new wrapper.

Thank you Laurence,
for me (Win11pro) no Problems so long.
Good Work.

Last change was for Apple only.
;-)

70.30 (vbox64_mt_mcore_cms) 29 Apr 2024, 12:37:49 UTC
300.30 (vbox64_theory) 29 Apr 2024, 19:43:57 UTC
It's the sight of Virtualbox.

Apps for Windows and Linux from earlier this week are running fine.
The general announcement can be found here:
https://lhcathome.cern.ch/lhcathome/forum_thread.php?id=6149

This discussion is about Computation Errors.
The recent ones affect Apple and even the app published this morning didn't solve it.

Taken from url=https://lhcathome.cern.ch/lhcathome/apps.php:

Intel 64-bit Mac OS 10.5 or later 	300.40 (vbox64_theory) 	3 May 2024, 8:42:28 UTC

Most likely by accident it still uses a vboxwrapper not including the required patch.

I have bumped the apple version again using a more recent build of vboxwrapper.

At least some of the Theory tasks succeeded now:
Intel 64-bit Mac OS 10.5 or later 300.50 (vbox64_theory) 3 May 2024, 13:08:28 UTC 5 GigaFLOPS

Meanwhile CMS also receives valid results from apple hosts:
Intel 64-bit Mac OS 10.5 or later 70.50 (vbox64_mt_mcore_cms) 3 May 2024, 13:12:17 UTC 12 GigaFLOPS