[Bug 6857] New: hg rollback randomly has no effect,

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6857

            Bug ID: 6857
           Summary: hg rollback randomly has no effect,
           Product: Mercurial
           Version: 6.5.3
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at mercurial-scm.org
          Reporter: php4fan at gmail.com
                CC: mercurial-devel at mercurial-scm.org
    Python Version: ---

Unfortunately I don't know how to reproduce this at will.
This just happened to me for no apparent reason.
I tried reproducing at will but couldn't.

What I did was:
- in a repository where there were no uncommitted changes, I made some changes
- I committed with 'hg commit -m "bla bla bla"' (note: i did NOT push)
- I made some more changes
- I ran the command: "hg rollback"

I got this strange output, which makes no sense whatsoever to me:
```
repository tip rolled back to revision 351 (undo push-response)
```

Normally when I do rollback I get this:
```
repository tip rolled back to revision 351 (undo commit)
```

After that, the repository was NOT rolled back. The last commit was still
there. hg status and hg diff would still show only changes I had made after the
last commit, as if I hadn't rolled back.

Basically, the rollback command had no effect whatsoever.

I tried running "hg rollback" again. This time I got the message:
```
no rollback information available
```

which would be expected if the rollback had had effect.

I could not roll back in any way, I had to keep the commit and move on.

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