It seems the problem is the JIRA Plugin.
Downgrading JIRA Plugin from 2.5.1 to 2.5.0 solves the problem.
As discussed in https://issues.jenkins-ci.org/browse/JENKINS-46503

tirsdag 6. februar 2018 20.25.36 UTC+1 skrev [email protected] følgende:
>
> This is the thread dump while it is hung:
>
> Thread #10
>     at DSL.checkout(running in thread: org.jenkinsci.plugins.workflow.
> steps.SynchronousNonBlockingStepExecution [#3])
>     at Script1.add_repo(Script1.groovy:309)
>     at Script1.run_compile_tests(Script1.groovy:49)
>     at DSL.stage(Native Method)
>     at Script1.run_compile_tests(Script1.groovy:48)
>     at DSL.node(running on merlin)
>     at Script1.run_compile_tests(Script1.groovy:46)
>     at Script1.grizzly_merge_request(Script1.groovy:336)
>     at DSL.gitlabCommitStatus(Native Method)
>     at Script1.grizzly_merge_request(Script1.groovy:335)
>     at Script1.grizzly_generator(Script1.groovy:331)
>     at WorkflowScript.run(WorkflowScript:37)
>
> I have reverted to git plugin 3.6.3 and git client plugin 2.6.0, which is 
> as far back as the GUI will let me go.
>
> On Tuesday, February 6, 2018 at 10:26:50 AM UTC-7, [email protected] 
> wrote:
>>
>> We have seeing the same problem.  For some reason it is calling 'git 
>> rev-list' on a commit that is 6 months old.  There doesn't seems to be 
>> anything particularly special about that commit (No release tag).
>>
>> I did notice that if I skip the 'merge before build' it has a higher 
>> chance of working, but it makes the job much less useful.
>>
>> I don't think the git command is actually what is hanging, because when I 
>> run 'ps' I don't see any processes running on the slave or the master.  It 
>> seems that the command finished, but the waiting process didn't get 
>> notified somehow?
>>
>> Any ideas how to debug this?  I would like to see what is going on in the 
>> git plugin.  Why is it picking that ancient commit?  What does it want to 
>> do next?  I tried adding a debug logger for 'hudson.plugins.git' and Log 
>> Level 'All' but I don't see anything useful.
>>
>>
>> On Monday, February 5, 2018 at 1:48:25 AM UTC-7, Sverre Moe wrote:
>>>
>>> Just now we got one Multibranch pipeline to hang on git rev-list on a 
>>> project that has no git tags.
>>> Running with latest Jenkins, git plugin, git-client plugin and git. 
>>>
>>> mandag 5. februar 2018 09.17.03 UTC+1 skrev Sverre Moe følgende:
>>>>
>>>> The problem occurred with the latest version of git plugin and git 
>>>> client plugin.
>>>> We have gotten the problem on projects that does not have many tags, 
>>>> aprox 300. We even got the problem on a project that has no tags at all.
>>>>
>>>> We are back at running with the latest version after I tried to revert 
>>>> back to the previous git-client-3.7.0 (was 3.7.1 and could not revert 
>>>> further back). On the server I have upgraded git to latest v2.16 (wanted 
>>>> to 
>>>> see if using a newer version of git would solve the problem).
>>>>
>>>> fredag 2. februar 2018 19.11.46 UTC+1 skrev Mark Waite følgende:
>>>>>
>>>>> The JENKINS-45447 and JENKINS-47169 fix in git client plugin 2.7.0 and 
>>>>> in git plugin 3.7.0 might be visible as a hang in `git rev-list`.  Does 
>>>>> that repository contain a large number of tags?  If so, then be sure 
>>>>> you're 
>>>>> using the latest releases of git client plugin and git plugin.
>>>>>
>>>>> Mark Waite
>>>>>
>>>>> On Fri, Feb 2, 2018 at 4:14 PM Sverre Moe <[email protected]> wrote:
>>>>>
>>>>>> Recently we upgraded Jenkins from 2.100 to 2.103, and a bunch of 
>>>>>> plugins at the same time.
>>>>>> After this we are frequently experiencing checkout scm to freeze at 
>>>>>> the last step in this process (git rev-list). It will hang there 
>>>>>> forever, 
>>>>>> way past the default 10 minutes timeout.
>>>>>>
>>>>>> Seems we are not the only one experiencing this problem, but while 
>>>>>> others have had this problem for quite some time we have only gotten it 
>>>>>> recently.
>>>>>> https://issues.jenkins-ci.org/browse/JENKINS-46503
>>>>>>
>>>>>> Anyone familiar with this problem?
>>>>>>
>>>>>> I was thinking of reverting back to Jenkins 2.100 and the following 
>>>>>> plugins
>>>>>> git 3.6.4
>>>>>> git-client 2.6.0
>>>>>> I have downloaded the JAR files for these plugins.
>>>>>>
>>>>>> -- 
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>>>>>> https://groups.google.com/d/msgid/jenkinsci-users/0a6cdca7-1a08-42e9-8e39-7fb2a10e287a%40googlegroups.com
>>>>>>  
>>>>>> <https://groups.google.com/d/msgid/jenkinsci-users/0a6cdca7-1a08-42e9-8e39-7fb2a10e287a%40googlegroups.com?utm_medium=email&utm_source=footer>
>>>>>> .
>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>
>>>>>

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