[CRIU] mnt namespaces

[shawn at churchofgit.com]

---- Original Message ----
 From: "Pavel Emelyanov" 
 To: shawn at www.churchofgit.com
CC: "Shawn Landden" , criu at openvz.org
 Sent: Wed, Dec 11, 2013, 02:22 AM
 Subject: Re: [CRIU] mnt namespaces
On 12/11/2013 08:50 AM, shawn at www.churchofgit.com (www.churchofgit.com) wrote:
---- Original Message ----
From: "Pavel Emelyanov" 
To: "Shawn Landden" 
CC: criu at openvz.org (mailto:criu at openvz.org)
Sent: Tue, Dec 10, 2013, 08:30 PM
Subject: Re: [CRIU] mnt namespaces

On 12/11/2013 08:19 AM, Shawn Landden wrote:

I can't figure out how to dump mount namespaces.

Namespaces are dumped by CRIU when it detects them, not when you specify it
with the option. IOW you should start a task in mount namespace and dump
one. Then CRIU will detect it and try to dump the mount namespace as well.

I tried that first, and I got the same error. the target pid is pid 1 in the namespace. 

criu dump -n mnt,net,pid,uts -t 109811

(00.004942) Warn (sk-unix.c:353): Can't stat socket 0x34de(./run/user/1000/pulse/native), skipping: No such file or directory (err 2)

This is a warning, that may not affect the dump. Would you show the full dump.log please?

None of these sockets have anything to do with what I am dumping?!?!?!?!?!
root at zephyr:/var/tmp/systemd-criu# criu dump -t 2496
(00.002533) Warn  (sk-unix.c:353): Can't stat socket 0x2b11(./tmp/ssh-MezaRkkHlqm2/agent.816), skipping: No such file or directory (err 2)
(00.002833) Warn  (sk-unix.c:353): Can't stat socket 0x301b(./run/user/1000/keyring-onPV5c/pkcs11), skipping: No such file or directory (err 2)
(00.002897) Warn  (sk-unix.c:353): Can't stat socket 0x3023(./run/user/1000/keyring-onPV5c/gpg), skipping: No such file or directory (err 2)
(00.002955) Warn  (sk-unix.c:353): Can't stat socket 0xd635(./tmp/9BA4686616EF5FDC8957B2D56E0FDFA1E2C0E01D.31.0.1650.63_service_ipc), skipping: No such file or directory (err 2)
(00.003015) Warn  (sk-unix.c:353): Can't stat socket 0x2945(./var/run/libvirt/libvirt-sock), skipping: No such file or directory (err 2)
(00.003076) Warn  (sk-unix.c:353): Can't stat socket 0x2947(./var/run/libvirt/libvirt-sock-ro), skipping: No such file or directory (err 2)
(00.003128) Warn  (sk-unix.c:353): Can't stat socket 0x1847(./run/udev/control), skipping: No such file or directory (err 2)
(00.003194) Warn  (sk-unix.c:353): Can't stat socket 0x7f80(./run/user/1000/wayland-0), skipping: No such file or directory (err 2)
(00.003248) Warn  (sk-unix.c:353): Can't stat socket 0x2b85(./tmp/.ICE-unix/857), skipping: No such file or directory (err 2)
(00.003303) Warn  (sk-unix.c:353): Can't stat socket 0x2c8e(./var/run/wpa_supplicant/wlan0), skipping: No such file or directory (err 2)
(00.003359) Warn  (sk-unix.c:353): Can't stat socket 0x2ba8(./run/user/1000/keyring-onPV5c/control), skipping: No such file or directory (err 2)
(00.003421) Warn  (sk-unix.c:353): Can't stat socket 0x2bb7(./run/user/1000/keyring-onPV5c/ssh), skipping: No such file or directory (err 2)
(00.003484) Warn  (sk-unix.c:353): Can't stat socket 0x2dc1(./tmp/.X11-unix/X0), skipping: No such file or directory (err 2)
(00.003540) Warn  (sk-unix.c:353): Can't stat socket 0xa6c2(./tmp/.org.chromium.Chromium.1jzIWa/SingletonSocket), skipping: No such file or directory (err 2)
(00.003597) Warn  (sk-unix.c:353): Can't stat socket 0x2ee6(./run/user/1000/pulse/native), skipping: No such file or directory (err 2)
(00.003656) Warn  (sk-unix.c:353): Can't stat socket 0x2de6(./tmp/gpg-EqSqB4/S.gpg-agent), skipping: No such file or directory (err 2)
(00.003709) Warn  (sk-unix.c:353): Can't stat socket 0x1be5(./var/run/libvirt/virtlockd-sock), skipping: No such file or directory (err 2)
(00.003762) Warn  (sk-unix.c:353): Can't stat socket 0x2ee8(./run/user/1000/pulse/dbus-socket), skipping: No such file or directory (err 2)
(00.003830) Warn  (sk-unix.c:353): Can't stat socket 0x1be8(./run/acpid.socket), skipping: No such file or directory (err 2)
(00.003968) Warn  (sk-unix.c:353): Can't stat socket 0x1bea(./var/run/avahi-daemon/socket), skipping: No such file or directory (err 2)
(00.004036) Warn  (sk-unix.c:353): Can't stat socket 0x1bed(./var/run/criu-service.socket), skipping: No such file or directory (err 2)
(00.004220) Warn  (sk-unix.c:353): Can't stat socket 0xa504(./run/acpid.socket), skipping: No such file or directory (err 2)
(00.004299) Warn  (sk-unix.c:353): Can't stat socket 0x350d(./run/user/1000/pulse/native), skipping: No such file or directory (err 2)
(00.004454) Warn  (sk-unix.c:353): Can't stat socket 0x351c(./run/user/1000/keyring-onPV5c/pkcs11), skipping: No such file or directory (err 2)
(00.004606) Warn  (sk-unix.c:353): Can't stat socket 0x34f2(./run/user/1000/pulse/native), skipping: No such file or directory (err 2)
(00.004679) Warn  (sk-unix.c:353): Can't stat socket 0x3902(./run/user/1000/keyring-onPV5c/pkcs11), skipping: No such file or directory (err 2)
(00.004820) Warn  (sk-unix.c:353): Can't stat socket 0xda04(./tmp/9BA4686616EF5FDC8957B2D56E0FDFA1E2C0E01D.31.0.1650.63_service_ipc), skipping: No such file or directory (err 2)
(00.004889) Warn  (sk-unix.c:353): Can't stat socket 0x34b0(./run/user/1000/pulse/native), skipping: No such file or directory (err 2)
(00.005000) Warn  (sk-unix.c:353): Can't stat socket 0xa644(./run/user/1000/pulse/native), skipping: No such file or directory (err 2)
(00.005137) Warn  (sk-unix.c:353): Can't stat socket 0x31b4(./run/user/1000/keyring-onPV5c/pkcs11), skipping: No such file or directory (err 2)
(00.005211) Warn  (sk-unix.c:353): Can't stat socket 0x10cbe(./run/user/1000/pulse/native), skipping: No such file or directory (err 2)
(00.005233) Warn  (sk-unix.c:353): Can't stat socket 0x7fc8(./run/user/1000/wayland-0), skipping: No such file or directory (err 2)
(00.010486) Error (files.c:245): Can't dump file 8 of that type [600] (anon )
(00.010533) Error (cr-dump.c:1491): Dump files (pid: 2496) failed with -1
(00.010837) Error (cr-dump.c:1811): Dumping FAILED.
root at zephyr:/var/tmp/systemd-criu# pstree -p 2496
systemd(2496)─┬─agetty(2526)
              ├─dbus-daemon(2523)
              ├─systemd-journal(2506)
              └─systemd-logind(2522)
I guess it is this line?
(00.010486) Error (files.c:245): Can't dump file 8 of that type [600] (anon ), which would refer to this:

systemd 2496 root    8u     0000                0,9        0       4507 anon_inode
from lsof
which I have no idea what this is.
I spawned this with systemd-nspawn -b
... trying without -b:
root at zephyr:/var/tmp/systemd-criu# criu dump -t 10414
(00.001500) Warn  (sk-unix.c:353): Can't stat socket 0x2b11(./tmp/ssh-MezaRkkHlqm2/agent.816), skipping: No such file or directory (err 2)
(trimmed)
(00.004377) Warn  (sk-unix.c:353): Can't stat socket 0x2812(./run/systemd/journal/stdout), skipping: No such file or directory (err 2)
(00.012143) Error (mount.c:336): Mount 119 (master_id: 1 shared_id: 0) has unreachable sharing
(00.012410) Error (namespaces.c:445): Namespaces dumping finished with error 65280
(00.012510) Error (cr-dump.c:1811): Dumping FAILED.
root at zephyr:/var/tmp/systemd-criu# pstree -p 10414
bash(10414)
root at zephyr:/var/tmp/systemd-criu# pstree -p 10413
systemd-nspawn(10413)───bash(10414)

etc....

The mount namespace has a folder bind mounted to /

-Shawn

Thanks,
Pavel
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