Public bug reported:
The OS is 16.10 Yakkety LiveCD.
I'm seeing silent file corruption when using the cp -ar switches for
file transfers to a Sandisk Ultra USB 3.0 32GB thumb drive across a USB
2.0 bus.
The first indication of a problem is when attempting to read the data at
some point in time after the initial copy.
The copy command completes successfully with no visible errors.
At first I thought this may have been related to an async write,
however; the issue persists after a flush of the write buffer prior to
ejection of the device, and there are no issues with DD.
As a test, a 2.5G file was generated with random data and then copied
with cp -ar to and from the device. The copy completes with no visible
errors within 3 seconds.
I've included the strace log of the transfer in action as an attachment.
** Affects: coreutils (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "strace"
https://bugs.launchpad.net/bugs/1681138/+attachment/4858497/+files/log.log
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https://bugs.launchpad.net/bugs/1681138
Title:
silent file corruption with cp -ar file transfers to USB
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