Grzegorz Nosek [root@xxxxxxxxxxxxxx] wrote: | On pon, lip 13, 2009 at 11:49:05 -0700, Sukadev Bhattiprolu wrote: | > Grzegorz Nosek [root@xxxxxxxxxxxxxx] wrote: | > | Simply run it as container init. Sometimes it oopses immediately, | > | > I am trying to reproduce this too and just trying to make sure I get | > your environment correctly. I have just built/installed libvirt 0.6.5 | > on Ubuntu 9.04. | | 0.6.4 or 0.6.5, no difference really (tested both). Host distro is | Debian Lenny but Ubuntu is probably close enough. Didn't test distro | kernel, only used hand-built 2.6.30, 2.6.30.1 and 2.6.31-rc2 Ok. Will try 2.6.31-rc2. | | > The bug does require libvirt+kvm right ? IOW, does this simple test repro | > if it is run as a container-init with say lxc-start (i.e from liblxc - see | > http://lxc.sourceforge.net/) ? Another simpler way to create container-init | > is the ns_exec program - I assume that won't create the problem ? | | Probably, as it requires a "cross-namespace" pty. I didn't yet set up a | lxc config file. Maybe you can help off the top of your head with the | right incantations? I don't have any beyond what is in the lxc-source examples. Maybe Daniel Lezcano has some. |BTW, where's the canonical source for ns_exec? It is here: git://git.sr71.net/~hallyn/cr_tests.git | | > Also in an earlier mail you mentioned that disabling the 'newinstance' | > mount option to devpts did not help. So does your setup work with older | > kernels like 2.6.28 ? | | Well, I failed to build 2.6.28 with NET_NS (even without SYSFS it wasn't | available in menuconfig) but 2.6.29 exhibits very similar behaviour, | i.e. crashes instantly. The difference is that when the pty master | exits, container init receives a SIGHUP. If it chooses to ignore it and | open /dev/console anyway, *boom*. Looking roughly at %eip and the | faulting address, it's the same bug. So I guess this is the first time we are trying this scenario out (i.e. it may not be a regression so we can't necessarily use git-bisect). I am not too familiar with libvirt implementation, but do you think it is possible to repro this using ns_exec and fewer/minimal namespaces ? We should be able to get a cross-namespace pty using ns_exec, but am not sure the set of namespaces need to be cloned - would it be sufficient if we clone pid and mount namespaces and remount /dev/pts in child container ? Thanks, Sukadev _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
