[lxc-users] Kernel lockups when running lxc-start (J?kel)

[Serge Hallyn]

Aufs support for that is actually very very new, thanks to Stéphane, so
I should have known when you mentioned upgrading from 0.7.5.

It's possible that switching to that will work around the kernel bug
for you.  Ideally though we'd get to the bottom of the bug so we can
avoid accidentally hitting it later on :)

Quoting Dao Quang Minh (dqminh89 at gmail.com):
> Yes, i setup the mountpoints in advance. I actually didnt know about the
> rootfs trick ( TIL ) :D
> 
> 
> On Wed, Mar 12, 2014 at 10:49 PM, Serge Hallyn <serge.hallyn at ubuntu.com>wrote:
> 
> > Ok, I see.  I thought you were using something like
> >
> >         lxc.rootfs =
> > aufs:/var/lib/lxc/container-name/rootfs:/var/lib/lxc/container-name/delta
> >
> > in the container configuration to have lxc do the aufs mount, rather
> > than setting the aufs mounts up in advance.
> >
> > Quoting Daniel, Dao Quang Minh (dqminh89 at gmail.com):
> > > Hmm, those entries appear on the host’s /proc/self/mountinfo. I guess
> > it’s because we union-mounts on /disk1/container-name and bind mount that
> > to /var/lib/lxc/container-name ?
> > >
> > > Here are the entries for `/proc/self/mountinfo` in the container:
> > >
> > > 1470 43 0:32 /rootfs / rw,relatime - aufs none rw,si=cbd79e20de63b17e
> > > 1471 1470 0:33 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
> > > 1472 1470 0:39 / /sys rw,relatime - sysfs sysfs rw
> > > 1473 1472 0:18 / /sys/fs/fuse/connections rw,relatime - fusectl none rw
> > > 1474 1472 0:6 / /sys/kernel/debug rw,relatime - debugfs none rw
> > > 1475 1472 0:10 / /sys/kernel/security rw,relatime - securityfs none rw
> > > 1476 1470 0:12 /10 /dev/lxc/console rw,nosuid,noexec,relatime - devpts
> > devpts rw,gid=5,mode=620,ptmxmode=000
> > > 1477 1470 0:12 /5 /dev/lxc/tty1 rw,nosuid,noexec,relatime - devpts
> > devpts rw,gid=5,mode=620,ptmxmode=000
> > > 1478 1470 0:12 /6 /dev/lxc/tty2 rw,nosuid,noexec,relatime - devpts
> > devpts rw,gid=5,mode=620,ptmxmode=000
> > > 1479 1470 0:12 /7 /dev/lxc/tty3 rw,nosuid,noexec,relatime - devpts
> > devpts rw,gid=5,mode=620,ptmxmode=000
> > > 1480 1470 0:12 /8 /dev/lxc/tty4 rw,nosuid,noexec,relatime - devpts
> > devpts rw,gid=5,mode=620,ptmxmode=000
> > > 44 1470 0:40 / /dev/pts rw,relatime - devpts devpts
> > rw,gid=5,mode=620,ptmxmode=666
> > > 50 1470 0:40 /ptmx /dev/ptmx rw,relatime - devpts devpts
> > rw,gid=5,mode=620,ptmxmode=666
> > > 51 1470 0:41 / /run rw,nosuid,noexec,relatime - tmpfs none
> > rw,size=1755388k,mode=755
> > > 52 51 0:447 / /run/lock rw,nosuid,nodev,noexec,relatime - tmpfs none
> > rw,size=5120k
> > > 69 51 0:1087 / /run/shm rw,nosuid,nodev,relatime - tmpfs none rw
> > >
> > >
> > >
> > > On Wednesday, 12 March, 2014 at 10:32 pm, Serge Hallyn wrote:
> > >
> > > > Quoting Dao Quang Minh (dqminh89 at gmail.com (mailto:dqminh89 at gmail.com
> > )):
> > > > > We havent tested without the bind mounts ( but we can probably try
> > it asap
> > > > > ). We migrated to 1.0.0 from 0.7.5 about a week ago, and this is the
> > first
> > > > > time i've seen this bug.
> > > > >
> > > > > `grep shared /proc/self/mountinfo` doesnt show anything, but
> > > > > `/proc/self/mountinfo` does display 2 entries per physical container
> > ( i
> > > > > guess because of the bind mounts ):
> > > > >
> > > > > ```
> > > > > 1766 39 0:764 / /disk1/container-name rw,relatime - aufs none
> > > > > rw,si=70f12540eaf98716
> > > > > 1768 38 0:764 / /var/lib/lxc/container-name rw,relatime - aufs none
> > > > > rw,si=70f12540eaf98716
> > > > >
> > > >
> > > >
> > > > Uh, these show up in the container, right? They should not show up on
> > > > the host.
> > > >
> > > > -serge
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> > >
> > >
> >
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