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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
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</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - journalctl misbehaves when wall clock is changed"
href="https://bugs.freedesktop.org/show_bug.cgi?id=80858">80858</a>
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<th>Assignee</th>
<td>systemd-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>journalctl misbehaves when wall clock is changed
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>systemd-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>marius.vollmer@redhat.com
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>general
</td>
</tr>
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<th>Product</th>
<td>systemd
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=102202" name="attach_102202" title="test program.">attachment 102202</a> <a href="attachment.cgi?id=102202&action=edit" title="test program.">[details]</a></span>
test program.
With a specific set of journal files, we are seeing some odd behavior. The
journal files cover multiple boots and have walltime discontinuities in them.
I'll send the journal files on request.
$ journalctl -D XXX/var/log/journal/ --cursor
's=de164a5e12e64f03b334128e4542ec9a;i=edb36;b=88b9ffdd4d2c40c1836f4a4d11c7d2bc;m=145f5aa0ae;t=4fc1b3c1b82f7;x=cf69db9bc053ff06'
-u NetworkManager --show-cursor | tail -1
-- cursor:
s=a6243fe62e0d45939c17eb9cb76f8812;i=11c34e;b=3e5244c588534eb4b4f3645d56b011c1;m=260accecf9;t=4fd38316fe7ed;x=38925d7bd704ad1d
$ journalctl -D XXX/var/log/journal/ --cursor
's=a6243fe62e0d45939c17eb9cb76f8812;i=11c34e;b=3e5244c588534eb4b4f3645d56b011c1;m=260accecf9;t=4fd38316fe7ed;x=38925d7bd704ad1d'
-u NetworkManager --show-cursor | tail -1
-- cursor:
s=de164a5e12e64f03b334128e4542ec9a;i=edb36;b=88b9ffdd4d2c40c1836f4a4d11c7d2bc;m=145f5aa0ae;t=4fc1b3c1b82f7;x=cf69db9bc053ff06
Thus, there are two cursors, and starting from one ends up at the other.
Also, doing sd_journal_seek_tail(), sd_journal_skip_previous(10) and then
looping over sd_journal_next until it returns 0 will happily loop over
thousands of entries, instead of the expected 10.
I attach a small program that combines these effects to get into an endless
loop, although it works correctly for most journal files.</pre>
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