linux-ext4 - [Bug 93031] New: root becomes read-only at boot due to journal_async

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Date:	Tue, 10 Feb 2015 07:59:55 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 93031] New: root becomes read-only at boot due to
 journal_async_commit in /etc/fstab

https://bugzilla.kernel.org/show_bug.cgi?id=93031

            Bug ID: 93031
           Summary: root becomes read-only at boot due to
                    journal_async_commit in /etc/fstab
           Product: File System
           Version: 2.5
    Kernel Version: 3.18.5
          Hardware: x86-64
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: high
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@...nel-bugs.osdl.org
          Reporter: mtall.qld@...il.com
        Regression: No

Booting kernel 3.18.5 with the journal_async_commit option for / in /etc/fstab
causes the root file system to be read-only. kernel 3.18.3 also has this
problem.

entry in /etc/fstab:
UUID=...  / ext4  defaults,nodiratime,noatime,journal_async_commit 1 1

Relevant log from dmesg:
EXT4-fs (sdb1): changing journal_checksum during remount not supported

Adding journal_checksum to /etc/fstab doesn't help.  Trying to manually remount
root to enable or disable journal_async_commit also doesn't work.

kernel 3.17.x works without problems.

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