On 05/17/2013 07:29 AM, 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 > prompt. > > 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! > Just a guess, but is your shell a subprocess of sssd? I have no idea if that might have any influence. But, I noticed, that on my machine, all of my bash processes are spawned via sssd, even though I didn't configure or even enable it. If that or anything similar happened in your case, I wouldn't be surprised that your shell is waiting for some timeouts while doing authentication that you might not know about. Again, that's just a wild guess. -- Jan Synacek Software Engineer, Red Hat -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
