From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 194739] New: fallocate --collapse-range causes temporal data
corruption on fragmented file
Date: Wed, 01 Mar 2017 00:00:51 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=194739
Bug ID: 194739
Summary: fallocate --collapse-range causes temporal data
corruption on fragmented file
Product: File System
Version: 2.5
Kernel Version: 4.10.1
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: fs_ext4@kernel-bugs.osdl.org
Reporter: iive@yahoo.com
Regression: No
I use `fallocate -c` to cut the start of the file without having to copy the
whole file again.
However recently, after collapsing the file it seems to repeat a portion of the
data, that should have been moved. That is, the new start of the file is found
somewhere around its old location.
Restarting the computer (or just hibernate) seems to fix the file.
Doing:
`echo 3 > /proc/sys/vm/drop_caches`
also seems to fix the issue. Using just `echo 1` fixes some of the data, but
the file still might be broken.
I've noticed this problem on 4.9 kernel. I'm not sure if it is regression,
because the problem might be triggered by high fragmentation. This partition
got quite full and the files are quite big, thus they are always very
fragmented.
Just want to make it clear.
Data on disk is not damaged.
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