[CRIU] Fake mount points in dump

[Pavel Emelyanov]

On 01/18/2016 03:35 PM, Stanislav Kinsburskiy wrote:
> Hi,
> 
> I'm trying to suspend a container with the following mount list in it:
> 
> [root at centos-7-x86_64 ~]# cat /proc/mounts
> rootfs / rootfs rw 0 0
> /dev/ploop43992p1 / ext4 rw,relatime,data=ordered,balloon_ino=12 0 0
> none /sys sysfs rw,relatime,ve=102 0 0
> none /sys/fs/cgroup tmpfs rw,relatime,size=1931780k,nr_inodes=482945 0 0
> cgroup /sys/fs/cgroup/cpuset cgroup 
> rw,nosuid,nodev,noexec,relatime,cpuset 0 0
> cgroup /sys/fs/cgroup/cpu,cpuacct cgroup 
> rw,nosuid,nodev,noexec,relatime,cpuacct,cpu 0 0
> cgroup /sys/fs/cgroup/memory cgroup 
> rw,nosuid,nodev,noexec,relatime,memory 0 0
> cgroup /sys/fs/cgroup/devices cgroup 
> rw,nosuid,nodev,noexec,relatime,devices 0 0
> cgroup /sys/fs/cgroup/freezer cgroup 
> rw,nosuid,nodev,noexec,relatime,freezer 0 0
> cgroup /sys/fs/cgroup/net_cls cgroup 
> rw,nosuid,nodev,noexec,relatime,net_cls 0 0
> cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0
> cgroup /sys/fs/cgroup/perf_event cgroup 
> rw,nosuid,nodev,noexec,relatime,perf_event 0 0
> cgroup /sys/fs/cgroup/hugetlb cgroup 
> rw,nosuid,nodev,noexec,relatime,hugetlb 0 0
> cgroup /sys/fs/cgroup/systemd cgroup 
> rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 
> 0 0
> proc /proc proc rw,relatime 0 0
> devtmpfs /dev devtmpfs rw,nosuid,size=1931780k,nr_inodes=482945 0 0
> tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
> devpts /dev/pts devpts 
> rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
> tmpfs /run tmpfs rw,nosuid,nodev,mode=755 0 0
> mqueue /dev/mqueue mqueue rw,relatime 0 0
> sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
> 
> and get the following error (persistent):
> 
> (00.221054) mnt: <--
> (00.221489)     type proc source proc mnt_id 20 s_dev 0x3 / @ ./proc 
> flags 0x30000e options
> (00.221651)     type sysfs source sysfs mnt_id 21 s_dev 0x13 / @ ./sys 
> flags 0x30000e options
> (00.221754)     type devtmpfs source devtmpfs mnt_id 22 s_dev 0x5 / @ 
> ./dev flags 0x1100000 options size=1922508k,nr_inodes=480627,mode=755
> (00.221842)     type securityfs source securityfs mnt_id 23 s_dev 0x14 / 
> @ ./sys/kernel/security flags 0x30000e options
> (00.221927)     type tmpfs source tmpfs mnt_id 24 s_dev 0x15 / @ 
> ./dev/shm flags 0x1100000 options
> (00.222015)     type devpts source devpts mnt_id 25 s_dev 0xb / @ 
> ./dev/pts flags 0x30000a options gid=5,mode=620,ptmxmode=000
> (00.222163)     type tmpfs source tmpfs mnt_id 26 s_dev 0x16 / @ ./run 
> flags 0x1100000 options mode=755
> (00.222624)     type tmpfs source tmpfs mnt_id 27 s_dev 0x17 / @ 
> ./sys/fs/cgroup flags 0x1100000 options mode=755
> (00.222716)     type cgroup source cgroup mnt_id 28 s_dev 0x18 / @ 
> ./sys/fs/cgroup/systemd flags 0x30000e options 
> xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd
> (00.222803)     type pstore source pstore mnt_id 29 s_dev 0x19 / @ 
> ./sys/fs/pstore flags 0x30000e options
> (00.222917)     type cgroup source cgroup mnt_id 30 s_dev 0x12 / @ 
> ./sys/fs/cgroup/cpuset flags 0x30000e options cpuset
> (00.223022)     type cgroup source cgroup mnt_id 31 s_dev 0x11 / @ 
> ./sys/fs/cgroup/cpu,cpuacct flags 0x30000e options cpuacct,cpu
> (00.223147)     type cgroup source cgroup mnt_id 32 s_dev 0xf / @ 
> ./sys/fs/cgroup/memory flags 0x30000e options memory
> (00.223303)     type cgroup source cgroup mnt_id 33 s_dev 0x1a / @ 
> ./sys/fs/cgroup/devices flags 0x30000e options devices
> (00.223425)     type cgroup source cgroup mnt_id 34 s_dev 0x1b / @ 
> ./sys/fs/cgroup/freezer flags 0x30000e options freezer
> (00.223514)     type cgroup source cgroup mnt_id 35 s_dev 0x1c / @ 
> ./sys/fs/cgroup/net_cls flags 0x30000e options net_cls
> (00.223602)     type cgroup source cgroup mnt_id 36 s_dev 0xe / @ 
> ./sys/fs/cgroup/blkio flags 0x30000e options blkio
> (00.223688)     type cgroup source cgroup mnt_id 37 s_dev 0x1d / @ 
> ./sys/fs/cgroup/perf_event flags 0x30000e options perf_event
> (00.223773)     type cgroup source cgroup mnt_id 38 s_dev 0x1e / @ 
> ./sys/fs/cgroup/hugetlb flags 0x30000e options hugetlb
> (00.223858)     type cgroup source cgroup mnt_id 39 s_dev 0x1f / @ 
> ./sys/fs/cgroup/ve flags 0x30000e options ve
> (00.224002)     type cgroup source cgroup mnt_id 40 s_dev 0x10 / @ 
> ./sys/fs/cgroup/beancounter flags 0x30000e options beancounter
> (00.224116)     type configfs source configfs mnt_id 43 s_dev 0x20 / @ 
> ./sys/kernel/config flags 0x300000 options
> (00.224274)     type ext4 source /dev/mapper/vz_skinsbursky--vz7-root 
> mnt_id 44 s_dev 0xfd00001 / @ ./ flags 0x300000 options 
> quota,usrquota,grpquota,data=ordered
> (00.224387)     type autofs source systemd-1 mnt_id 45 s_dev 0x21 / @ 
> ./proc/sys/fs/binfmt_misc flags 0x300000 options 
> fd=32,pgrp=1,timeout=300,minproto=5,maxproto=5,direct
> (00.224485) Error (autofs.c:220): Failed to find pipe_ino option (old 
> kernel?)
> (00.224565) Error (proc_parse.c:1385): Failed to parse FS specific data 
> on ./proc/sys/fs/binfmt_misc
> (00.224686) Error (mount.c:1908): mnt: Can't parse 83507's mountinfo
> (00.224770) Error (mount.c:824): mnt: Failed to find criu pid's mount ns

This error only appear if you use --ext-mount-map auto, do you?

> 
> The error itself is valid, while autofs mount point presence is not.
> This mount point belongs to host.
> 
> Full dump log is attached.
> 
> 
> 
> _______________________________________________
> CRIU mailing list
> CRIU at openvz.org
> https://lists.openvz.org/mailman/listinfo/criu
>