[Users] vzctl error

[Csiszár Tamás]

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.

Thank you for your help in advance!

Regards,
Tamas


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