data loss in 2.6.9-rc1-mm1
From: Gergely Tamas
Date: Fri Aug 27 2004 - 05:57:33 EST
Hi!
I've hit the following data loss problem under 2.6.9-rc1-mm1.
If I copy data from a file to another the target will be smaller then
the source file.
2.6.9-rc1 does not have this problem
2.6.8.1-mm4 does not have this problem
2.6.9-rc1-mm1 _does have_ this problem
I tried this with reiserfs and xfs and it happened with both of them.
See the testcase at the bottom of this mail.
Thanks in advance,
Gergely
--------------------------------------------------
$ uname -r
2.6.9-rc1
$ dd if=/dev/zero of=testfile bs=$((1024*1024)) count=10
10+0 records in
10+0 records out
10485760 bytes transferred in 0.028646 seconds (366045254 bytes/sec)
$ du -sb testfile
10485760 testfile
$ cat testfile > testfile.1
$ du -sb testfile.1
10485760 testfile.1
--------------------------------------------------
$ uname -r
2.6.8.1-mm4
$ dd if=/dev/zero of=testfile bs=$((1024*1024)) count=10
10+0 records in
10+0 records out
10485760 bytes transferred in 0.028632 seconds (366226397 bytes/sec)
$ du -sb testfile
10485760 testfile
$ cat testfile > testfile.1
$ du -sb testfile.1
10485760 testfile.1
--------------------------------------------------
$ uname -r
2.6.9-rc1-mm1
$ dd if=/dev/zero of=testfile bs=$((1024*1024)) count=10
10+0 records in
10+0 records out
10485760 bytes transferred in 0.028418 seconds (368981986 bytes/sec)
$ du -sb testfile
10485760 testfile
$ cat testfile > testfile.1
$ du -sb testfile.1
10481664 testfile.1
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