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New: Inode exhaustion should be logged to dmesg

Bug 197335 [email protected] 1 participant 3 messages Oct 20, 2017 – Oct 31, 2017

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https://bugzilla.kernel.org/show_bug.cgi?id=197335

            Bug ID: 197335
           Summary: Inode exhaustion should be logged to dmesg
           Product: File System
           Version: 2.5
    Kernel Version: 4.14.0-rc1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: ext4
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Problem: If the system runs out of inodes, the error messages show "No space on disk". This is misleading to the user as the disk may still have space. Logging to dmesg can help the user correctly identify the problem.

Bug #1665833 from https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1665833

My server just became unusable, because it ran out of inodes (something that shouldn't happen on a relatively normal installation). The root-cause was a misbehaving CRM program creating way too many session files and never deleting them. However, while debugging, it would have been really really helpful if there were something in the logfiles. But it just failed silently: the lack of any error message makes diagnosing this error condition 100x harder than it should be. We get messages about being out of disk-space, but that's not helpful, especially when "df -h" shows it not to be true.

So, the bug report/feature request is this: when the kernel cannot create a new file due to a shortage of inodes, it should emit a message to that effect, at least in dmesg (and ideally also to syslog).

[For anyone else who chances upon this bug report, you can tell if you have run out of inodes with "df -i", and you can find the offending directories with:
"find / -xdev -size +100k -type d" ]

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[Bug 197335] Inode exhaustion should be logged to dmesg

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=197335

--- Comment #2 from Team Athena ([email protected]) --- Created attachment 260449
--> https://bugzilla.kernel.org/attachment.cgi?id=260449&action=edit
Make a log in dmesg when file creation fails due to no free inode

Uses a ext4_warning to log to dmesg

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