Bug 143126 - [ata] Data loss on read timeout
Summary: [ata] Data loss on read timeout
Status: Open
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: Unspecified
Hardware: Any Any
: Normal Affects Only Me
Assignee: freebsd-bugs (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-01-23 14:50 UTC by Andrey Russev
Modified: 2018-01-03 05:14 UTC (History)
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Description Andrey Russev 2010-01-23 14:50:01 UTC 
Sometimes (possibly on heavy loads of disk) kernel prints messages like:
ad6: TIMEOUT - READ_DMA48 retrying (1 retry left) LBA=615699968
These messages appear while copy/move of large file in progress. Such timeouts do not interrupt commands and they finish _without_ errors.
In case mentioned above I figured out that data from previous 64k block (LBA=615699968-128) was damaged (first ~30% bytes are correct). Second copy command (after unmount/mount) makes exact copy of data.

How-To-Repeat: I don't know. It occurs at random intervals.
Comment 1 Eitan Adler freebsd_committer freebsd_triage 2017-12-31 07:59:52 UTC 
For bugs matching the following criteria:

Status: In Progress Changed: (is less than) 2014-06-01

Reset to default assignee and clear in-progress tags.

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