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Description of problem:
We currently pass "--hostonly-cmdline" to dracut when making kdump initramfs,
this is useful to collect more information on the host, but on the other hand it also results in more needless stuff added to kdump.

For example, more host devices(like lvm devices, devices mounted to /boot, /boot/efi, etc) will be generated as "wait_for_dev", then kdump must wait for all the devices ready.

Actually, Fedora doesn't have "--hostonly-cmdline", it works all the time as well. There is some difference regarding dracut between RHEL7 and Fedora, we need to investigate and see if can keep align with Fedora.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
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Actual results:


Expected results:
Remove "--hostonly-cmdline" for RHEL7.5

Additional info:

After some discussion within team, we decided to keep "--hostonly-cmdline" and add the new "--no-hostonly-default-device" feature instead.

*** Bug 1467567 has been marked as a duplicate of this bug. ***

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0807