Hello,

I'm getting the following error pretty frequently (~25% of the time) when 
starting pipeline jobs on one of our Jenkins servers.  It occurs in the scm 
step of our pipelines, and I've seen it in all 3 of our pipelines on this 
server:

Failed to parse 
/opt/jenkins/inst/jobs/nightly.build/builds/43/changelog1.xml: '<?xml 
version="1.0" encoding="UTF-8"?> <changesets> '
See stage logs for more detail.

The stage logs do not have any more details - console output for that stage 
step is:

[nightly.build] $ hg showconfig paths.default
[nightly.build] $ hg pull --rev default
pulling from <masterrepo>
no changes found
[nightly.build] $ hg update --clean --rev default
108 files updated, 0 files merged, 0 files removed, 0 files unresolved
[nightly.build] $ hg log --rev . --template {node}
[nightly.build] $ hg log --rev . --template {rev}
[nightly.build] $ hg log --rev 629ca14eef09b0e09c37627a94ea51c0d5129bfb 
--template exists\n
exists
[nightly.build] $ hg log --template "<changeset node='{node}' 
author='{author|xmlescape}' rev='{rev}' 
date='{date}'><msg>{desc|xmlescape}</msg><added>{file_adds|stringify|xmlescape}</added><deleted>{file_dels|stringify|xmlescape}</deleted><files>{files|stringify|xmlescape}</files><parents>{parents}</parents></changeset>\n"
 --rev "ancestors('default') and not 
ancestors(629ca14eef09b0e09c37627a94ea51c0d5129bfb)" --encoding UTF-8 
--encodingmode replace
[nightly.build] $ hg log --rev . --template {node} 

[nightly.build] $ hg log --rev . --template {rev}

The contents of the changelog look OK to me:

/export/on-gate/usr/fish $ cat 
/opt/jenkins/inst/jobs/nightly.build/builds/43/changelog1.xml
<?xml version="1.0" encoding="UTF-8"?>
<changesets>
</changesets>

Jenkins 2.46.2 LTS, Mercurial plugin 1.59, java 1.8.0_131, hg 4.1

Any ideas?  I've never seen this error on any of our other Jenkins 
instances, and it's killing us on this one.

Thanks!
     Adam

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