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Bug 996785 - umount -a causes root file system to become read-only
Summary: umount -a causes root file system to become read-only
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: util-linux-ng
Version: 6.1
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Karel Zak
QA Contact: qe-baseos-daemons
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-08-13 23:43 UTC by Scott Mikusko
Modified: 2015-08-25 13:05 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-08-25 13:05:31 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Scott Mikusko 2013-08-13 23:43:38 UTC 
Description of problem: 

When doing an umount -a to umount all non-busy file systems in /etc/fstab, the / file system flips to read-only. Command may not actually unmount the file systems.  mount -n -o remount.rw / will get the file system back to read-write, but mtab won't update and df -k will not show the mounted file systems that /etc/fstab has configured.

The other local disk file systems (/opt, /var, /boot, /usr) are unaffected.


Version-Release number of selected component (if applicable):
RHEL 6.1, mount from util-linux-ng 2.17.2


How reproducible:
Two servers running the same OS, versions, and config show the same problem:
umount -a, / flips to RO, mount -a says the file systems are already mounted, df -k doesn't show the mounted file systems from /etc/ftab apart from the local OS disks.


Steps to Reproduce:
1.  verify /etc/fstab /etc/mtab, df -k to see all mounted file systems
2.  umount -a  ; umounts unused filesystems (NFS mounts, local disk not held up by processes
3.  touch /etc/file, can't / has become read-only

Actual results:
/ read-only


Expected results:

expect / to stay read-write, all the file systems in /etc/fstab should remount with mount -a.  df -k should show all the mounted file systems

Additional info:
Comment 2 RHEL Program Management 2013-10-14 02:44:49 UTC 
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.
Comment 3 Karel Zak 2015-08-25 13:05:31 UTC 
The "umount -a" works as expected. It's designed for shutdown and remount root fs read-only is expected feature. 

Note that RHEL7 umount provides -R,--recursive option to umount hierarchy of filesystem. It seems better solution than call umount -a.
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