linux-ext4 - Re: Need help to understand Ext4 message in /var/log/message file

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Date:   Fri, 24 Apr 2020 15:43:11 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Alok Jain <jain.alok103@...il.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: Need help to understand Ext4 message in /var/log/message file

On Apr 24, 2020, at 12:56 PM, Alok Jain <jain.alok103@...il.com> wrote:
> 
> Hi Guys,
> 
> I need an help to understand the following messages printed in
> /var/log/message file
> 
> Apr 20 17:42:44 mylinux audispd: node=mylinux type=EXECVE
> msg=audit(1587404564.745:5901346): argc=4 a0="mount" a1="-v"
> a2="UUID=b1d54239-2b18-44b3-a4bf-5e0ca32b8f78" a3="/tmp/aj/m1"
> Apr 20 17:42:45 mylinux kernel: [4633324.069180] EXT4-fs (sde1):
> recovery complete
> Apr 20 17:42:45 mylinux kernel: [4633324.070157] EXT4-fs (sde1):
> mounted filesystem with ordered data mode. Opts: (null)
> 
> 
> Actualy one of the iSCSI device is mounted to /tmp/aj/m1 with UUID
> (U1) I unmounted this device and mounted new device (UUID
> b1d54239-2b18-44b3-a4bf-5e0ca32b8f78) after mount I see the UUID of
> newly mounted device changed to U1 and new device got corrupted. I ran
> fsck to fix the device but UUID was changed to U1.

It sounds like the iSCSI device is not flushing the block device
cache between unmounting the old filesystem and mounting the new one?

The new filesystem has a dirty journal, and when it is replayed it
reads a stale superblock from the old filesystem and overwrites the
new filesystem.

Cheers, Andreas






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