Upgrading to Oracle VirtualBox 4.3.20 removed the timeout messages shown below.
The bug was acknowledged in the change log as
Storage: fixed an interrupt acknowledge issue causing hanging guests or slower I/O (4.3.18
Since upgrading Oracle VirtualBox from 4.3.16 to 4.3.18 on my Windows 7 x64 host, most of my FreeBSD guests from time to time shows kernel messages like the ones below.
ahcich2: Timeout on slot 7 port 0 ahcich2: is 00000008 cs 00000000 ss 00000000 rs 00000080 tfd 50 serr 00000000 cmd 1000c717 (ada2:ahcich2:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61 40 62 d4 9c 40 00 00 00 00 00 00 (ada2:ahcich2:0:0:0): CAM status: Command timeout (ada2:ahcich2:0:0:0): Retrying command
It doesn’t matter if your FreeBSD guests run version 4.3.16 or version 4.3.18 of the
Someone else reported similar kernel messages on physical servers, making me believe some recent changes in FreeBSD can be blamed. Or, maybe this is just a coincidence, despite the similarities.