Bug 1652058

Summary: Use mdadm to create raid1 with two disks and partion it,then remove one disk from the raid.After this system installation will fail.
Product: Red Hat Enterprise Linux 7 Reporter: Zhou Yihang <zhouyihang1>
Component: python-blivetAssignee: Blivet Maintenance Team <blivet-maint-list>
Status: CLOSED WONTFIX QA Contact: Release Test Team <release-test-team-automation>
Severity: high Docs Contact:
Priority: unspecified    
Version: 7.5   
Target Milestone: rc   
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Hardware: Unspecified   
OS: Unspecified   
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Last Closed: 2021-03-15 07:31:43 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Zhou Yihang 2018-11-21 13:50:02 UTC 
Created attachment 1507698 [details]
Exception report

Description of problem:
I used mdadm to create a raid1 with two disks and partion it,then i removed one disk from the raid.After this, i try to install system but it will report exception.It is interesting that if i remove another one disk and remain the oringinal one,then system installation will success.
Information detail:
anaconda 21.48.22.134-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/devicelibs/mdraid.py", line 378, in name_from_md_node
    raise MDRaidError("name_from_md_node(%s) failed" % node)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 926, in addUdevPartitionDevice
    name = mdraid.name_from_md_node(name)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1240, in addUdevDevice
    device = self.addUdevPartitionDevice(info)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2306, in _populate
    self.addUdevDevice(dev)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 2239, in populate
    self._populate()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 495, in reset
    self.devicetree.populate(cleanupOnly=cleanupOnly)
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 190, in storageInitialize
    storage.reset()
  File "/usr/lib64/python2.7/threading.py", line 765, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 227, in run
    threading.Thread.run(self, *args, **kwargs)
MDRaidError: name_from_md_node(md127p1) failed

Local variables in innermost frame:
node: md127p1
name: None
md_dir: /dev/md


Version-Release number of selected component (if applicable):
python-blivet-0.61.15.69-1.el7.noarch.rpm

How reproducible:


Steps to Reproduce:
1.A normal system with two vacant disks like sdb,sdc. 
2.mdadm -C /dev/md0 -l 1 -n 2 /dev/sdb /dev/sdc
3.Excute "fdisk /dev/md0" to create a partion on /dev/md0.
4.mdadm -f /dev/md0 /dev/sdc;mdadm -r /dev/md0 /dev/sdc
5.Shutdown and install system.
Actual results:
It will report exception.

Expected results:
Installation success.

Additional info:
If remove sdc won't reproduce the problem,then try to redo the"Steps to Reproduce" but remove sdb instead of sdc.
I also tried to install Fedora28 aside from rehat7.5.There was no problem with Fedora28.
During the installation of Fedora28 I switched to commanline and found a mdadm configure file--mdadm.conf under directory /etc/,but I didn't find it in redhat7.5.
So I added the the same mdadm.conf to squashfs.img of redhat7.5 and recreate iso.The was not exception report any more when I installed system with new iso.
Comment 4 RHEL Program Management 2021-03-15 07:31:43 UTC 
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.