From Fedora Project Wiki

m (ppc64le)
Line 195: Line 195:
   needs upstream investigation
   needs upstream investigation
Note: no longer failing as of Sep 26, 2019 - patsy
Note: no longer failing as of Sep 26, 2019 - patsy
      Did not fail on Oct 20, 2019 - patsy
In case it's sporadic, we should confirm fixed with the next sync before removing.
In case it's sporadic, we should confirm fixed with the next sync before removing.

Revision as of 16:19, 20 October 2019

Rawhide synchronization for the GNU C Library

Make sure you have authenticated and meet the pre-requisites (see notes below).

Synchronization Process

  • Setup/Fetch a clean upstream master repository for glibc. This can be an existing directory also which you switch to master branch and ensure it has been rebased e.g. git pull --rebase cleanly to head.
mkdir -p $HOME/src
cd $HOME/src
git clone git:// glibc-pristine
  • Setup/Fetch a clean Fedora rawhide glibc repository. If this is not your first time syncing, you may need to remove the glibc-patches subdirectory that the previous sync created.
cd $HOME/fedsrc
fedpkg clone glibc
  • Run fedpkg sources to downloads the .tar.xy file needed for creating the glibc-patches repository (next step).
cd $HOME/fedsrc/glibc
fedpkg sources
  • Convert the Fedora rawhide glibc dist-git repository to a glibc-patches repository (git repo with Fedora patches applied as commits).
export GLIBC_MS=$HOME/fedsrc/glibc-maintainer-scripts
cd $HOME/fedsrc/glibc
  • Synchronize from upstream master to Fedora rawhide and review changes.
cd $HOME/fedsrc/glibc
$GLIBC_MS/ --import-git $HOME/src/glibc-pristine --verbose
git diff
  • Dealing with merge conflicts due to backport+rebase:

Sometimes, a fix is backported from upstream into rawhide, and subsequently a rebase is scheduled. During this rebase, the backport and its corresponding patch need to be dropped.

One way to achieve this is to manually edit the spec file prior to running glibc-patches-to-git so that the merge conflict is avoided in the first place.

Another way is to let the merge conflict occur, then run git rebase --skip in the glibc-patches directory/repository to skip the application of the current patch (i.e. the one backported, which is causing the merge conflict) and continue the rebase (this rebase is an internal detail of how glibc-sync-upstream is implemented and was started by the script before erroring out due to the conflict).

Then we continue the process by executing glibc-git-to-patches in $HOME/fedsrc/glibc, which now skips the patch when creating glibc-patches.

Finally, we run glibc-patches-to-git --branch master, to bring update dist-git with the recently refreshed glibc-patches.

  • Manually document note-worthy changes in the %changelog. This step is probably the most complex. You need to look at all the changes since the last sync (the hash is recorded in the %changelog) in the upstream repo and see if there is anything note-worthy to talk about e.g. git diff HASH1^..HASH2. You will use this text in your commit message also.
* Wed Nov 07 2018 Florian Weimer <> - 2.28.9000-14
- Auto-sync with upstream branch master,
  commit 1df872fd74f730bcae3df201a229195445d2e18a:
- libanl: Fix crash if first helper thread creation failed (#1646381)

A useful command to summarize commits is git log like this:

cd $HOME/src/glibc-pristine
git log --oneline e0cb7b6131..0ddb7ea842

The two hashes to use are based on the two files noted in the glibcsrcdir lines in glibc.spec. In the above example, we're updating from glibc-2.29.9000-86-ge0cb7b6131 to glibc-2.29.9000-114-g0ddb7ea842

  • Add new files (still in the Fedora rawhide directory from the last step) and commit
cd $HOME/fedsrc/glibc
fedpkg new-sources glibc-*.tar.gz
git add glibc.spec
git commit

An appropriate commit message would be:

    Auto-sync with upstream branch master
    Upstream commit: 1df872fd74f730bcae3df201a229195445d2e18a
    - libanl: Fix crash if first helper thread creation failed (#1646381)

Following the spec file %changelog example from above.

  • Test a scratch build, and wait for it to complete.
fedpkg srpm
fedpkg scratch-build --srpm ./glibc-XXX.src.rpm
  • Verify scratch build results by downloading logs and looking for any unexpected failures. A list of known failures is kept at the end of this page, and should be updated as needed.
export TOOLS=$HOME/fedsrc/UpstreamToolchainBuildScripts
  • Lastly, push the commit and kick off a Rawhide build if the logs look good.
git push
fedpkg build


  • Kerberos init with Fedora realm.
  • Make sure your ssh agent has your Fedora ssh key for


  • You have a Fedora account with an SSH key, and have setup your SSH key on by logging in.
  • Install fedpkg, python3-pygit2, python3-rpm and git-merge-changelog
  • Configure your ~/.gitconfig to have entries for name, and a merge driver for GNU Changelogs.
	name = My Name

[merge "merge-changelog"]
        name = GNU-style ChangeLog Merge driver
        driver = /usr/bin/git-merge-changelog
	attributesfile = ~/.gitattributes
  • Configure your ~/.gitattributes
ChangeLog       merge=merge-changelog
  • Clone glibc-maintainer-scripts into $GLIBC_MS for the git synchronization scripts.
export GLIBC_MS=$HOME/fedsrc/glibc-maintainer-scripts
mkdir -p $HOME/fedsrc
cd $HOME/fedsrc
git clone
  • Clone UpstreamToolchainBuildScripts from the Fedora Toolchain team for the build log fetching scripts.
export TOOLS=$HOME/fedsrc/UpstreamToolchainBuildScripts
cd $HOME/fedsrc
git clone

Note: if you plan on editing either of the two git repos you just installed, use ssh:// instead of

Differences for Release Syncs

The process is basically the same, except you have to use the Bodhi system to push your build to a release.

  • In the above instructions, use the release branch of glibc (typically like release/2.28/master) and the release branch of Fedora (typically like f29)
  • Click the ? icon in the upper right, to search for "glibc"
  • Note previous updates for wordings and severities
  • Select "Create" in the upper right and create a new update
  • Type "glibc" in the packages field. If there's a popup, select the appropriate entry.
  • type "glibc" in the candidate builds field, select the relevent build from the popup.
  • Click in the "Related bugs" field. If your BZ doesn't show up, type in the number.
  • Fill in the Update Notes field and final details.
  • Submit! The system will advertise the update and request karma. When the update has enough karma, it's automatically pushed out.

Known Acceptable Build Failures

For the purposes of "looking for any unexpected failures" (above), this is the current list of build failures that have been deemed "not to stop a sync". After you complete the scratch build and download the logs, compare the test failures in the logs with the results below. For each failure not listed here, analyze it, determine if it's safe to continue syncing, and add that failure below. For each failure listed below that no longer appears in the test results, remove it from below. I.e. most syncs will require minor updates in this section.

All Hosts



FAIL: misc/tst-sigcontext-get_pc
info: address in signal handler: 0xb6de61dc
error: ../sysdeps/unix/sysv/linux/tst-sigcontext-get_pc.c:44: not true: callstack_count > 0
error: 1 test failures
  minor but needs upstream investigation

FAIL: nptl/tst-cancelx18.out
going to cancel in-time
cleanup handler not called
  needs upstream investigation
Note: no longer failing as of Sep 26, 2019 - patsy
      Did not fail on Oct 20, 2019 - patsy
In case it's sporadic, we should confirm fixed with the next sync before removing.


FAIL: elf/tst-dlopen-aout
  This is an incomplete fix of bug 24900.

FAIL: malloc/tst-mxfast
tst-mxfast.c:42: numeric comparison failure
   left: 1 (0x1); from: m.smblks
  right: 0 (0x0); from: 0
error: 1 test failures
  Minor, but investigate.


FAIL: math/test-totalorderl-ldbl-128ibm
  Perhaps caused by 42760d764649ad82f5fe45a26cbdf2c2500409f7
Note: no longer failing as of Sep 26, 2019 - patsy
In case it's sporadic, we should confirm fixed with the next sync before removing.

FAIL: misc/tst-pkey
error: ../sysdeps/unix/sysv/linux/tst-pkey.c:200: pkey_alloc: No space left on device



FAIL: elf/tst-dlopen-aout
  see i686