[Bug 1096076] New: ADDing file to symlinked /bin hangs, docker process spinning at 100 % CPU

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1096076

Bug ID: 1096076
           Summary: ADDing file to symlinked /bin hangs, docker process
                    spinning at 100 % CPU
           Product: Fedora
           Version: 20
         Component: docker-io
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail], [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail], [e-mail]

Description of problem:

On Fedora 20, /bin is a symlink to usr/bin. When Dockerfile tries to ADD file
to /bin, the process will hang, with the daemon spinning at 100 % CPU.

Version-Release number of selected component (if applicable):

docker-io-0.11.1-1.fc20.x86_64
Seen on 0.10* as well.

How reproducible:

Deterministic.

Steps to Reproduce:
1. echo test > testfile
2. have Dockerfile with
    FROM fedora:20
    ADD testfile /bin/testfile
3. run docker build -t test-symlink .

Actual results:

Uploading context 4.608 kB
Uploading context 
Step 0 : FROM fedora:20
 ---> b7de3133ff98
Step 1 : ADD testfile /bin/testfile

and that's it, top in another terminal shows

Expected results:

# docker build -t test-symlink .
Uploading context 5.632 kB
Uploading context 
Step 0 : FROM fedora:20
 ---> b7de3133ff98
Step 1 : ADD testfile /bin/testfile
 ---> 6fb52b6363f7
Removing intermediate container 11254a256eb7
Successfully built 6fb52b6363f7
#

Additional info:

ADD to /usr/bin/testfile works.

[Bug 1096076] ADDing file to symlinked /bin hangs, docker process spinning at 100 % CPU

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1096076

Jan Pazdziora  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |Regression
                 CC|                            |[e-mail]

--- Comment #1 from Jan Pazdziora  ---
I should add: it is a regression against docker-io-0.9 so it has the potential
of hitting people who were happily using ADD to /bin in the past.

[Bug 1096076] ADDing file to symlinked /bin hangs, docker process spinning at 100 % CPU

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1096076

--- Comment #2 from Daniel Walsh  ---
Could you check if this is fixed in docker-io-0.11.1-2.fc20

[Bug 1096076] ADDing file to symlinked /bin hangs, docker process spinning at 100 % CPU

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1096076

--- Comment #3 from Jan Pazdziora  ---
(In reply to Daniel Walsh from comment #2)
> Could you check if this is fixed in docker-io-0.11.1-2.fc20

I don't see this fixed with docker-io-0.11.1-3.fc20.x86_64.

[Bug 1096076] ADDing file to symlinked /bin hangs, docker process spinning at 100 % CPU

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1096076

Daniel Walsh  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|[e-mail]             |[e-mail]

[Bug 1096076] ADDing file to symlinked /bin hangs, docker process spinning at 100 % CPU

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1096076

--- Comment #4 from Matthew Heon  ---
Issue is fixed in upstream - build of their Git master does not have this
issue. I'll identify the patch so we can carry it until the next upstream
release.

[Bug 1096076] ADDing file to symlinked /bin hangs, docker process spinning at 100 % CPU

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1096076

--- Comment #5 from Daniel Walsh  ---
Well we should be rebasing as soon as they release.  Rather then carry the
patch.

[Bug 1096076] ADDing file to symlinked /bin hangs, docker process spinning at 100 % CPU

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1096076

Matthew Heon  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |MODIFIED

--- Comment #6 from Matthew Heon  ---
This is fixed in docker-io-1.0.0-1, which just made it into updates-testing.

[Bug 1096076] ADDing file to symlinked /bin hangs, docker process spinning at 100 % CPU

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1096076

Jan Pazdziora  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|MODIFIED                    |CLOSED
   Fixed In Version|                            |docker-io-1.0.0-1.fc20
         Resolution|---                         |CURRENTRELEASE
        Last Closed|                            |2014-06-25 07:37:17

--- Comment #7 from Jan Pazdziora  ---
I confirm the issue fixed.