su starts behaving oddly sometimes on F19
tmraz at redhat.com
Fri May 17 10:33:16 UTC 2013
On Thu, 2013-05-16 at 22:29 -0700, Adam Williamson wrote:
> This is a weird bug I've seen 3 or 4 times since upgrading to F19, and
> am having trouble pinning down.
> Occasionally, after my session has been up for some time, runs of 'su'
> start behaving oddly. After I enter the root password, it takes a long
> time - longer than the delay that's always happened when you fat-finger
> your password, even - before it succeeds. Usually, of course, it's
> instant. But when this bug happens, I just get to sit there while it
> thinks about it for like 10-15 seconds before I eventually get a root
> This only applies to my desktop session - but it applies to any terminal
> running in the desktop. At least, it applies to gnome-terminal (even if
> closed and opened again) and xterm. But if I go to ctrl-alt-f2, login,
> and run an 'su', that still returns instantly.
> I've tried strace'ing su, but interestingly, I can't get it to work:
> running su via strace always seems to result in "Authentication
> failure" (which doesn't display this bug; it's only _normally_ slow, the
> same slowness that has always been the case when you fail the password).
> So I'm kinda stuck, really. Has anyone else seen this? Any bright ideas
> for debugging it? Thanks!
Try attaching the strace (as root) to the su process when it waits for
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