Random I/O Cache Error VERR_INVALID_PARAMETER

[Thomas Oster]

Hi, since a few Weeks I get those random I/O Cache errors which make my VM go to pause. I can then resume it without any problems and I cannot find out what causes that error. If I enable the "Host I/O Cache" in the SATA Controller, the error does not seem to occur, but this slows down my machine, so I cannot leave this enabled.

The exact error message is:

I/O cache: Error while writing entry at offset 87278690304 (16384 bytes) to medium "ahci-0-0" (rc=VERR_INVALID_PARAMETER)

it is written in file

VBox/VMM/VMMR3/PDMBlkCache.cpp

on line 2603 in function

static void pdmBlkCacheIoXferCompleteEntry(PPDMBLKCACHE pBlkCache, PPDMBLKCACHEIOXFER hIoXfer, int rcIoXfer)

I tried to delete all unnecessary snapshots (there are two left) and updated to 5.1, but the problem persists.

Sometimes it is once in a few days, sometimes multiple times a day.

Following System information:

Host System:

• Ubuntu 12.04.5 LTS on kernel 3.2.0 64bit (problem was present on older kernels, too)
• VirtualBox Version 5.1.2r108956
• VDI File on a dedicated SSD (problem was also on HDD) with ext4 filesystem (49% of capacity used)
• 4.8 of 31.8 GB RAM free during normal operation

GuestSystem:

• Windows Server 2012 R2 (64 bit)
• 16.2 GB RAM
• IO APIC enabled
• 2 vCPUs
• PAE/NX enabled
• VT-x/AMD-V enabled
• Nested Paging enabled
• VPID enabled
• Audio Intel HDA enabled on PulseAudio driver
• USB 1.1 enabled (not used)

[Thomas Oster]

Log file with typical Error->Pause->Unpause sequence at the end

[Thomas Oster]

I noticed, that I could not clone my VDI (latest snapshot) anymore, so the underlying problem may be a corrupted VDI. I had to recreate the VM and since then, the error did not occur anymore (yet).