[Users] vzctl error

[Kir Kolyshkin]

On 05/22/2013 05:24 AM, Csiszár Tamás wrote:
> Hi,
>
> I have a strange error on one of our servers when I use vzctl. There's 
> a running host with a few VE-s and if I type /vzctl enter "CTID"/ then 
> I receive /enter into CT "CTID" failed/ and no further messages. After 
> a lot of debugging I realized that it works if I directly connect via 
> the server's console, but if I login via ssh it gives the error.
> The system parameters:
> OS: CentOS release 6.4
> Kernel: Linux vm4 2.6.32-042stab078.10 #1 SMP Wed May 8 19:45:03 MSK 
> 2013 x86_64 x86_64 x86_64 GNU/Linux
> vzctl: vzctl-core-4.2-1.el6.x86_64
>          vzctl-4.2-1.el6.x86_64
>
> I've tried to reboot the system with different kernels, but the same 
> error. There's another strange thing: we have another machine with the 
> same kernel but I cannot reproduce the error there.
> I've also tried to run vzctl with gdb and search in the source code, 
> and there seems to be a problem around setting up the environment:
> In src/lib/hooks_vz.c there's a function:
>
> /static int vz_env_create_ioctl(vps_handler *h, envid_t veid, int flags)//
> //{//
> //        struct vzctl_env_create env_create;//
> //        int errcode;//
> //        int retry = 0;//
> //
> //        memset(&env_create, 0, sizeof(env_create));//
> //        env_create.veid = veid;//
> //        env_create.flags = flags;//
> //        do {//
> //                if (retry)//
> //                        sleep(1);//
> //                errcode = ioctl(h->vzfd, VZCTL_ENV_CREATE, 
> &env_create);//
> //                fprintf(stderr,"error code: %d\n",errcode);//
> //        } while (errcode < 0 && errno == EBUSY && retry++ < ENVRETRY);//
> //        if (errcode >= 0 && (flags & VE_ENTER)) {//
> //                /* Clear supplementary group IDs *///
> //                setgroups(0, NULL);//
> //                /* Set personality PER_LINUX32 for i386 based CTs *///
> //                set_personality32();//
> //        }//
> //        else{//
> //fprintf(stderr,"%s,%d\n",strerror(errno),errno);//
> //        }//
> //        return errcode;//
> //}/
>
> The ioctl returns with an error: INVALID ARG. Also the vzct start/stop 
> don't work.
> I compared the two host's environment variables, but no difference.
>

Hmm, looks weird.

The fact that it works from console and doesn't work from ssh is 
interesting. Maybe you should compare your environment from console and ssh.

If you want I can take a look, email me privately.
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