Re: Bug#468075: this bug/#468075 - sudo: system freeze
Thanks for the analysis. Why does it only affect aptitude sometimes
(after an upgrade is aborted)? Is that due to some cache? Why isn't
apt/itude using mmap (?)?
Out of curiousity, what kernel and hardware are you using?
On Fri, Mar 21, 2008 at 08:49:13AM -0700, Daniel Burrows wrote:
> On Fri, Mar 21, 2008 at 07:14:15AM -0700, Daniel Burrows <email@example.com> was heard to say:
> > Interestingly, if I run these on a text console, other text consoles
> > and the programs running in them are unaffected. Only X suffers a
> > complete freeze.
> Here's an odd thing.
> If I ssh to localhost, then run the test program I wrote, I get no
> freeze. If I run "su" and then run the test program, I get no freeze.
> If I run "sudo sh" and then run the test program, I get no freeze. But
> "sudo su -c ./test" does freeze.
sudo ./test also freezes. (sudo su never made sense to me).
> I'm not sure what to make of that.
Also, while testing, I tried to minimize the time interval of the
freeze, by running:
while sleep 4; do sudo killall test2; done
That worked (terminated the program after a short interval, but long
enough for me to know that it froze). However when I tried (to avoid
spamming my syslog with sudo events) this:
sudo sh -c 'while sleep 4; do killall test2; done'
it didn't work (the root shell loop apparently was frozen). Lacking a
better explanation, it seems like processes that were UID 0 at some
point in time get stuck, but processes that become UID 0 don't.
Apparently, all that's necessary is to loop around lseek with a