[Users] Users Digest, Vol 118, Issue 15

[Dmitry Mishin]

Please use https://bugs.openvz.org/browse/OVZ-6304 for this issue communications.

Thank you,
Dmitry.

From: <users-bounces at openvz.org<mailto:users-bounces at openvz.org>> on behalf of Alkaid <zgf574564920 at gmail.com<mailto:zgf574564920 at gmail.com>>
Reply-To: "users at openvz.org<mailto:users at openvz.org>" <users at openvz.org<mailto:users at openvz.org>>
Date: Wednesday 19 August 2015 14:45
To: "users at openvz.org<mailto:users at openvz.org>" <users at openvz.org<mailto:users at openvz.org>>
Subject: Re: [Users] Users Digest, Vol 118, Issue 15

Well, I tried to debug.
I copy created ploop template to  CentOS7, create a container, then gdb vzctl start 101
With gdb, I found error occured in libvzctl, part of the stack is bellow

#0  write_data (path=path at entry=0x7fffffff9b90 "/sys/fs/cgroup/ve/101/ve.state", data=data at entry=0x7ffff7066cfc "START") at cgroup.c:161
#1  0x00007ffff7029376 in cg_set_param (ctid=ctid at entry=0x621e70 "101", subsys=subsys at entry=0x7ffff706aa6d "ve", name=name at entry=0x7ffff7066d02 "ve.s
tate", data=data at entry=0x7ffff7066cfc "START") at cgroup.c:235
#2  0x00007ffff703ba6d in start_container (h=0x621e70) at env_nsops.c:199
#3  real_ns_env_create (arg=0x7fffffffad40) at env_nsops.c:215
#4  0x00007ffff6d4f1ad in clone () from /lib64/libc.so.6

this thread is cloned from vzctl

>From the source code, I can find in lib/cgroup.c     function write_data    line 161
        here is "fd = open(path, O_WRONLY);"

So what on earth makes this "open" Permission Denied, what should I debug next ?


2015-08-19 3:00 GMT+08:00 <users-request at openvz.org<mailto:users-request at openvz.org>>:
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Today's Topics:

   1. Can't open /sys/fs/cgroup/ve/$UUID/ve.state for writing:
      Permission denied (Alkaid)


----------------------------------------------------------------------

Message: 1
Date: Tue, 18 Aug 2015 16:53:12 +0800
From: Alkaid <zgf574564920 at gmail.com<mailto:zgf574564920 at gmail.com>>
To: users at openvz.org<mailto:users at openvz.org>
Subject: [Users] Can't open /sys/fs/cgroup/ve/$UUID/ve.state for
        writing:        Permission denied
Message-ID:
        <CAJFQjcM8u-5F23EhhC3OkqHp_DgOT+LH6Xa-D0qfmYiet9jhKg at mail.gmail.com<mailto:CAJFQjcM8u-5F23EhhC3OkqHp_DgOT%2BLH6Xa-D0qfmYiet9jhKg at mail.gmail.com>>
Content-Type: text/plain; charset="utf-8"

I am using Centos7+vzkernel+...
When creating ostemplate, it always creates an temporary container to
download and install packages. But vzctl can't open ve.state with O_WRONLY,
result is EACCES ( Permission denied).
cmd: vzpkg create cache centos-6-x86_64, full log is in the attachment

I found an issue on bugs.openvz.org<http://bugs.openvz.org> (https://bugs.openvz.org/browse/OVZ-6304),
I wonder why it was treated as "Feature Request" and a "Userspace" problem.

On the same time, everything works fine in the cloudlinux, they have nearly
the same environment
    kernel 3.10.0-123.1.2.vz7.5.29
    vzctl v.7.0.60-1.vz7
    libvzctl-7.0.89-1.1.vz7.x86_64
    vztt-7.0.22-1.vz7.x86_64
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