Unknown exception encountered with possibly-broken third-party extension felog
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
This error can occur when there are API changes to Mercurial
Mercurial 3.0+ support is currently being tracked at FE-5253 - Support Mercurial 3.x
Mercurial 2.3 support was adding in Fisheye/Crucible 2.10 - FE-4350 - FishEye not fully compatible with Mercurial 2.3
Symptoms
The indexing of the Mercurial repository fails and the following appears in the atlassian-fisheye-<DATE>.log:
1
Repository index failed due to error com.cenqua.fisheye.rep.RepositoryClientException: com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Error while communicating with VCS: ** Unknown exception encountered with possibly-broken third-party extension felog ** which supports versions unknown of Mercurial. ** Please disable felog and try your action again. ** If that fixes the bug please report it to the extension author. ** Python 2.6.6 (r266:84292, Jun 18 2012, 14:18:47) [GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] ** Mercurial Distributed SCM (version 2.3) ** Extensions loaded: felog Traceback (most recent call last): File "/usr/bin/hg", line 38, in <module> mercurial.dispatch.run() File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 28, in run sys.exit((dispatch(request(sys.argv[1:])) or 0) & 255) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 65, in dispatch return _runcatch(req) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 88, in _runcatch return _dispatch(req) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 740, in _dispatch cmdpats, cmdoptions) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 514, in runcommand ret = _runcommand(ui, options, cmd, d) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 830, in _runcommand return checkargs() File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 801, in checkargs return cmdfunc() File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 737, in <lambda> d = lambda: util.checksignature(func)(ui, *args, **cmdoptions) File "/usr/lib64/python2.6/site-packages/mercurial/util.py", line 472, in check return func(*args, **kwargs) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 95, in felog felognode(ui, repo, repo[r], **opts) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 121, in felognode diffParent(ui, repo, ctx, commitState, f, opts.get('patch'), opts.get('converted'), opts.get('merges'), opts.get('changesets')) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 136, in diffParent processPath(ui, repo, ctx, commitState, format, diffs, svnConversion, f) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 141, in processPath state = pathstate(repo, ctx, commitState, svnConversion, f) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 269, in __init__ self._parents = getDeletedFileParents(ctx, path) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 260, in getDeletedFileParents ancestor0 = parents[0].ancestor(parents[1]) TypeError: ancestor() takes exactly 3 arguments (2 given) com.atlassian.fisheye.dvcs.handler.DvcsProcessException: Error while communicating with VCS: ** Unknown exception encountered with possibly-broken third-party extension felog ** which supports versions unknown of Mercurial. ** Please disable felog and try your action again. ** If that fixes the bug please report it to the extension author. ** Python 2.6.6 (r266:84292, Jun 18 2012, 14:18:47) [GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] ** Mercurial Distributed SCM (version 2.3) ** Extensions loaded: felog Traceback (most recent call last): File "/usr/bin/hg", line 38, in <module> mercurial.dispatch.run() File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 28, in run sys.exit((dispatch(request(sys.argv[1:])) or 0) & 255) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 65, in dispatch return _runcatch(req) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 88, in _runcatch return _dispatch(req) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 740, in _dispatch cmdpats, cmdoptions) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 514, in runcommand ret = _runcommand(ui, options, cmd, d) File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 830, in _runcommand return checkargs() File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 801, in checkargs return cmdfunc() File "/usr/lib64/python2.6/site-packages/mercurial/dispatch.py", line 737, in <lambda> d = lambda: util.checksignature(func)(ui, *args, **cmdoptions) File "/usr/lib64/python2.6/site-packages/mercurial/util.py", line 472, in check return func(*args, **kwargs) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 95, in felog felognode(ui, repo, repo[r], **opts) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 121, in felognode diffParent(ui, repo, ctx, commitState, f, opts.get('patch'), opts.get('converted'), opts.get('merges'), opts.get('changesets')) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 136, in diffParent processPath(ui, repo, ctx, commitState, format, diffs, svnConversion, f) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 141, in processPath state = pathstate(repo, ctx, commitState, svnConversion, f) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 269, in __init__ self._parents = getDeletedFileParents(ctx, path) File "/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py", line 260, in getDeletedFileParents ancestor0 = parents[0].ancestor(parents[1]) TypeError: ancestor() takes exactly 3 arguments (2 given) com.atlassian.utils.process.ProcessException: While executing: "hg --config extensions.felog=/opt/atlassian/fecru-2.8.2/python/hg/hgfelog/hgfelog.py --config ui.verbose=false felog fb7903d8ae9827336bb5116ff88f34663838b1fa -p -m " in [/opt/atlassian/fisheye/var/cache/Momo-dev/clone] com.atlassian.utils.process.ProcessException: Non-zero exit code: 1
Diagnosis
Your MercurialServer version is 3.0+.
Cause
Because of API changes in Mercurial 3.0 in some cases Mercurial indexing with FishEye can crash.
Solution
Workaround
As a workaround, point FishEye to a Mercurial executable in an earlier supported version, as described here: Mercurial client.
Updated on April 8, 2025
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