linux-ext4 - [Bug 200753] write I/O error for inode structure leads to operation failure without any warning or error

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Message-ID: <bug-200753-13602-EBCFKrrqXA@https.bugzilla.kernel.org/>
Date:   Tue, 07 Aug 2018 14:52:42 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 200753] write I/O error for inode structure leads to operation
 failure without any warning or error

https://bugzilla.kernel.org/show_bug.cgi?id=200753

Martin Steigerwald (Martin@...htvoll.de) changed:

           What    |Removed                     |Added
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                 CC|                            |Martin@...htvoll.de

--- Comment #12 from Martin Steigerwald (Martin@...htvoll.de) ---
Interesting. That may explain why on doing a "blkdiscard" on the partition of
an Ext4 filesystem mounted as / on an SSD does not seem to show anything in
"dmesg -w" started before the "blkdiscard" command. I always was quite a bit
puzzled about this. This happened with a running Plasma desktop which attempts
to write things quite regularly. When accessing a command not yet in cache I do
receive "error in format of binary file" (roughly translated from German
language). But still nothing in kernel log ring buffer. This is on some Fujitsu
workstation with Intel CPU + chipset. I assume the kernel uses libata AHCI for
accessing it. No access to such a workstation at the moment.

I made a test with creating an 1 exibyte large XFS filesystem on a large sparse
file on a way smaller XFS filesystem and on writing to the 1 exibyte large
filesystem beyond the free space left in the underlying XFS gave error messages
like "lost buffer write" in kernel log. I never tried the "blkdiscard" thing
with XFS so far tough.

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