Mailinglist Archive: opensuse-bugs (4238 mails)

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https://bugzilla.novell.com/show_bug.cgi?id=732910

https://bugzilla.novell.com/show_bug.cgi?id=732910#c26


--- Comment #26 from Neil Rickert <nrickert@xxxxxxxxxxxxx> 2011-12-22 00:19:28 
UTC ---
said by Phil Bertin:
> The culprit so HAS to be the /sbin/dhclient6.

We cannot rule out a kernel bug.

Unless I am misreading, there is a kernel bug there somewhere.

I added some debugging, as mentioned in comment 23.  So when the lease renewed
this afternoon, I check for the debug data.  It was nowhere to be seen.

As I read dhclient-script:
 my debugging data should be appended to the end of the log file.
 then some asterisks and a timestamp should be appended (around line 40 of
 dhclient-script).  And then stderr from running the script should be
 appended to the log file (the "exec >>2" statement a few lines down).

But when I look at the logfile, the first thing I see is that "redirected to
systemctl" line.  So the output from the last of those steps has truncated the
log file, instead of appending to the end.

I have not yet tested.  I am guessing that:

echo string > /dev/stderr

is what is truncating the log file.  I would think that is a kernel bug. 
"/dev/stderr" is a symlink to "/dev/fd/2, and file descriptor 2 is open for
append.  I admittedly am not certain of the definition of "/dev/fd/n" but it
seems strange for that to be able to truncate a file when the file descriptor
is open for append.  If that's not a kernel bug, then the line in
"/etc/rc.status" that writes to "/dev/stderr" should be using ">>" rather than
">".

I'm not ruling out a bug in dhclient.  There seems be room here for multiple
bugs.  It's possible that there's a bug in "dhclient" that has been there for a
long time, but not actually triggered until that "/etc/rc.status" line wrote to
stderr with the move to systemd.

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