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Bug 985160 - dracut ignores cmdline root= path
Summary: dracut ignores cmdline root= path
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: dracut
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: dracut-maint
QA Contact: Release Test Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-07-17 01:22 UTC by Alex Williamson
Modified: 2014-06-18 03:55 UTC (History)
3 users (show)

Fixed In Version: dracut-033-144.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-06-13 11:31:15 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
screenshot (83.80 KB, image/jpeg)
2013-07-17 01:22 UTC, Alex Williamson 		no flags Details
rdsosreport.txt (4.45 MB, text/plain)
2014-02-17 16:47 UTC, Jan Stodola 		no flags Details
View All

Description Alex Williamson 2013-07-17 01:22:27 UTC 
Created attachment 774574 [details]
screenshot

Description of problem:
RHEL7 decided it wanted to make a logical volume named "root" during install, which doesn't match my naming scheme at all.  Post install I renamed the logical volume to lv_rhel7 and updated the cmdline in grub.  Dracut doesn't seem to use care what root= value is passed on the cmdline and still look for the, now non-existent, root logical volume... What's the point of root=?

Version-Release number of selected component (if applicable):
rhel7

How reproducible:
100%

Steps to Reproduce:
1. Rename your root logical volume
2. Update grub cmdline to reflect the new name
3. Attempt to reboot

Actual results:
See attached image

Expected results:
root= should override whatever path is embedded in the initrd.

Additional info:
Comment 2 Harald Hoyer 2013-07-31 15:37:31 UTC 
To get to the system again, boot with the rescue entry, change root=, run
# dracut --regenerate-all -f

And retry with the normal grub entry, with dracut-031-4.git20130731.el7, where this is hopefully fixed.

# dracut -f
Comment 4 Jan Stodola 2014-02-17 16:47:41 UTC 
Created attachment 864198 [details]
rdsosreport.txt

Retested with dracut-033-124.el7, but system doesn't boot after changing LV name with rootfs:

[root@localhost ~]# lvrename rhel root rhel7
  Renamed "root" to "rhel7" in volume group "rhel"
[root@localhost ~]#

modifying kernel cmdline and reboot:

dracut:/# cat /proc/cmdline 
BOOT_IMAGE=/vmlinuz-3.10.0-86.el7.x86_64 root=/dev/mapper/rhel-rhel7 ro rd.lvm.lv=rhel/rhel7 vconsole.font=latarcyrheb-sun16 rd.lvm.lv=rhel/swap vconsole.keymap=us crashkernel=auto rhgb quiet LANG=en_US.UTF-8 rd.debug console=ttyS0
dracut:/# lvm lvs
  LV    VG   Attr       LSize  Pool Origin Data%  Move Log Cpy%Sync Convert
  rhel7 rhel -wi-a----- 17.51g                                             
  swap  rhel -wi-a-----  2.00g                                             
dracut:/#

rdsosreport.txt is attached.
Comment 5 Harald Hoyer 2014-02-26 14:32:19 UTC 
please retry with dracut-033-137.el7
Comment 6 Jan Stodola 2014-02-26 14:59:27 UTC 
Retested with dracut-033-137.el7, system booted correctly after changing root=, rd.lvm.lv= and updating /etc/fstab with the new LV name.
Comment 8 Jan Stodola 2014-03-05 09:12:17 UTC 
Retested with dracut-033-145.el7, this issue is fixed.

Moving to VERIFIED.
Comment 9 Ludek Smid 2014-06-13 11:31:15 UTC 
This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.
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