[CRIU] Restoring lxc-1.1.5 centos 7 container with httpd fails
Adrian Reber
adrian at lisas.de
Wed May 11 23:12:52 PDT 2016
On Wed, May 11, 2016 at 02:32:23PM -0700, Andrey Vagin wrote:
> On Wed, May 11, 2016 at 09:35:54AM +0200, Adrian Reber wrote:
> > Hello Andrey,
> >
> > I applied your last three patches from the CRIU ML:
> >
> > mount: create a clean mount only if a sub directory is bind-mounted
> > mount: don't overmount a mount if it should be bind-mounted somewhere
> > mount: dump a file system only if a mount point isn't overmounted
> >
> > and I can checkpoint and restore a lxc container with httpd, mongodb and
> > postgresql running in it. I haven't yet checked if all patches are
> > necessary for my problem, but I can look further into it if you want.
> >
> > If I start mariadb I still get
>
> https://gist.github.com/avagin/5972076d9ae5aac5d3053a646c01bfe9
>
> There is something wrong with aio. Kirill, could you help us with this
> error? I know that you met the same problem in VZ.
>
> pie: Error (pie/restorer.c:582): wrong aio parametrs: tail=0x0 head=0x>
> pie: 0 nr=0xbe len=0x3000
I should have looked closer at the log file. This is a RHEL/CentOS
problem. I have to carry following patch in the CRIU rpm package to deal
with AIO:
--- a/criu/aio.c 2015-07-01 11:02:50.360004543 -0400
+++ b/criu/aio.c 2015-07-01 11:03:33.099757812 -0400
@@ -61,7 +61,7 @@
* up back to the k_max_reqs.
*/
- return (k_max_reqs - 2) / 2;
+ return (k_max_reqs - 2);
}
unsigned long aio_rings_args_size(struct vm_area_list *vmas)
https://git.centos.org/blob/rpms!criu/d3d9a8a7e792a6c594097d8d35312a9d1735afa5/SOURCES!aio-fix.patch
https://git.centos.org/blob/rpms!criu/d3d9a8a7e792a6c594097d8d35312a9d1735afa5/SPECS!criu.spec#L11
With this patch applied on your mount patches on top of criu-dev, I can
now also checkpoint and restart a mariadb container. In fact I have
container with mariadb, postgresql, mongodb, httpd and tomcat running
and I can checkpoint and restore it without a problem.
Thanks for the help!
Adrian
> >
> > (00.142574) 294: Parsed 7f8d95799000-7f8d9579a000 vma
> > (00.169810) Error (cr-restore.c:1407): 6077 killed by signal 9: Killed
> > (00.169972) Switching to new ns to clean ghosts
> > (00.170019) Error (files-reg.c:515): `- XFail [.criu.mntns.3xE0jR/15var/tmp/ib8i8FJW.cr.1.ghost] ghost: No such file or directory
> > (00.170024) Error (files-reg.c:515): `- XFail [.criu.mntns.3xE0jR/15var/tmp/ibHo1ZB4.cr.2.ghost] ghost: No such file or directory
> > (00.170027) Error (files-reg.c:515): `- XFail [.criu.mntns.3xE0jR/15var/tmp/ib0eakuc.cr.3.ghost] ghost: No such file or directory
> > (00.170029) Error (files-reg.c:515): `- XFail [.criu.mntns.3xE0jR/15var/tmp/ibtHE6fs.cr.4.ghost] ghost: No such file or directory
> > (00.170031) Error (files-reg.c:515): `- XFail [.criu.mntns.3xE0jR/15var/tmp/ibmiNsaA.cr.5.ghost] ghost: No such file or directory
> > (00.170827) Error (cr-restore.c:2251): Restoring FAILED.
> >
> > Thanks so far.
> >
> > Adrian
> >
> >
> > On Fri, May 06, 2016 at 04:01:16PM -0700, Andrey Vagin wrote:
> > > Hi Adrian,
> > >
> > > Can you create a kvm VM where I will be able to reproduce the problem?
> > >
> > > I tried to reproduce it by myself, but it works for me.
> > >
> > > 18435 pts/0 S 0:00 [lxc monitor] /var/lib/lxc centos
> > > 18441 ? Ss 0:00 \_ /sbin/init
> > > 18475 ? Ss 0:00 \_ /usr/lib/systemd/systemd-journald
> > > 18476 ? Ss 0:00 \_ /usr/lib/systemd/systemd-udevd
> > > 18477 ? Ss 0:00 \_ /usr/lib/systemd/systemd-logind
> > > 18478 ? Ss 0:00 \_ /bin/dbus-daemon --system
> > > --address=systemd: --nofork --nopidfile --systemd-activation
> > > 18479 ? Ssl 0:00 \_ /usr/sbin/rsyslogd -n
> > > 18480 ? Ss 0:00 \_ /usr/sbin/sshd -D
> > > 18481 ? Ss 0:00 \_ /usr/sbin/httpd -DFOREGROUND
> > > 18482 ? S 0:00 \_ /usr/sbin/httpd -DFOREGROUND
> > > 18483 ? S 0:00 \_ /usr/sbin/httpd -DFOREGROUND
> > > 18484 ? S 0:00 \_ /usr/sbin/httpd -DFOREGROUND
> > > 18485 ? S 0:00 \_ /usr/sbin/httpd -DFOREGROUND
> > > 18486 ? S 0:00 \_ /usr/sbin/httpd -DFOREGROUND
> > > 19812 ? Ss 0:00 /usr/sbin/crond -n
> > > [root at localhost lxc]# LD_LIBRARY_PATH=/usr/local/lib64/ ./src/lxc/lxc-checkpoint -s -n centos -D /root/images -v
> > > [root at localhost lxc]# LD_LIBRARY_PATH=/usr/local/lib64/ ./src/lxc/lxc-checkpoint -r -n centos -D /root/images -v
> > > [root at localhost lxc]# echo $?
> > > 0
> > > [root at localhost lxc]# git describe HEAD
> > > lxc-2.0.0
> > >
> > >
> > > On Fri, May 06, 2016 at 10:25:12PM +0200, Adrian Reber wrote:
> > > > > > > We've discussed with Adrian in irc and he promised to give more
> > > > > > > info about this issue.
> > > > > > >
> > > > > > > To investiage this sort of bugs I add sleep(1000) after pr_err() to
> > > > > > > freeze processes in a moment of the error and try to find what is wrong
> > > > > > > here via /proc/PID/root.
> > > > > >
> > > > > > With the sleep after the last pr_err() I see two criu processes:
> > > > > >
> > > > > > # ls -la /proc/10183/root
> > > > > > lrwxrwxrwx. 1 root root 0 May 6 08:47 /proc/10183/root -> /
> > > > > > # ls -la /proc/10188/root
> > > > > > lrwxrwxrwx. 1 root root 0 May 6 08:47 /proc/10188/root -> /
> > > > >
> > > > > I mean that you need to try to resolve source and target argumnets of a
> > > > > mount syscall which returns an error.
> > > >
> > > > I am not really sure what to do. The current restore fails with:
> > > >
> > > > (00.080566) 1: mnt: Bind /tmp/cr-tmpfs.KD4sxa/hugetlb to .criu.mntns.07hSc4/13/sys/fs/cgroup/hugetlb
> > > > (00.080585) 1: Error (mount.c:2479): mnt: Can't mount at .criu.mntns.07hSc4/13/sys/fs/cgroup/hugetlb: No such file or directory
> > > >
> > > > The directory /proc/4745/root/var/lib/lxc/c7/rootfs/.criu.mntns.07hSc4
> > > > is empty. So that seems to explain why the mount is not working.
> > > >
> > > > The other directory exists:
> > > >
> > > > # ls /proc/4745/root/tmp/cr-tmpfs.KD4sxa/hugetlb/
> > > > lxc
> > > >
> > > > So is the first empty directory the problem? As the path contains
> > > > 'mntns'... Does this need some special mount namespace support. This is
> > > > running on the CentOS 7 kernel. Which might be missing some features.
> > > >
> > > >
> > > > Adrian
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