cfdisk wipes out partition table when trying to replace a single logical partition

cfdisk wipes out partition table when trying to replace a single logical partition

[Michał Górny]

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(please CC me on replies)

Hello,

I'm afraid I've hit a bug that has been introduced in 2.25 and still
not fixed in current git.

I start with the following disk layout:

  Device     Boot    Start       End   Sectors  Size Id Type
  /dev/sdb1  *          63  93755339  93755277 44.7G  7 HPFS/NTFS/exFAT
  /dev/sdb2       93755392 234439534 140684143 67.1G  5 Extended
  /dev/sdb5       93757440 135700479  41943040   20G 83 Linux

Now I start cfdisk and remove sdb5, and create a larger partition on
top of it. At this point, cfdisk shows correct disk layout (sdb1, sdb2
and new sdb5), so I save it. However, the partition table written to
disk is incorrect:

  Device     Boot    Start       End  Sectors Size Id Type
  /dev/sdb1       93757440 146186239 52428800  25G 83 Linux

As far as I can see, cfdisk removed both the primary and extended
partitions, and wrote my new logical partition as primary. As you can
guess, this is rather unexpected and undesired.

I can consistently reproduce the issue.

-- 
Best regards,
Michał Górny

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Re: cfdisk wipes out partition table when trying to replace a single logical partition

[Karel Zak]

On Mon, Aug 25, 2014 at 08:29:46PM +0200, Michał Górny wrote:
> I'm afraid I've hit a bug that has been introduced in 2.25 and still
> not fixed in current git.

 Yep, it's pretty ugly bug. Fixed. We need 2.25.1 really ASAP.

    Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com