line 200: echo: write error: Broken pipe while restarting OpenVZ

node = ts27 (x86_64)
kernel = 2.6.18-92.1.13.el5.028stab059.1 #1 SMP Tue Sep 30 21:58:19 MSD 2008
vzctl-lib-3.0.22-1
vzctl-3.0.22-1
bash-3.2-21.el5
grep-2.5.1-54.2.el5

1. Restarted OpenVZ and got this "error: Broken pipe":
[root@ts27 ~]# /sbin/service vz restart
Stopping OpenVZ: [ OK ]
/etc/init.d/vz: line 200: echo: write error: Broken pipe
/etc/init.d/vz: line 200: echo: write error: Broken pipe
Starting OpenVZ: [ OK ]
Bringing up interface venet0: [ OK ]
Configuring interface venet0: [ OK ]

2. This is the piece of /etc/init.d/vz, line 200 is marked:


{
        test -r /proc/config.gz || return 0

        local conf opt err=0
        local opt_must="SIM_FS VE VE_CALLS VZ_GENCALLS"
        get_kernel_version
        # For kernels >= 2.6.9 VZ_DEV must be set.
        test "${KERNEL_MINOR}" -ge 6 &&
                test "${KERNEL_PATCHLEVEL}" -gt 9 &&
                        opt_must="${opt_must} VZ_DEV"
        local opt_rec="SCHED_VCPU FAIRSCHED VZ_QUOTA VZ_QUOTA_UGID VE_NETDEV VE_ETHDEV
                        VE_IPTABLES VZ_CHECKPOINT VZ_WDOG"

        conf="`zcat /proc/config.gz 2>/dev/null | grep -E -v '^#|^$'`"

        for opt in $opt_must; do
                if ! echo "${conf}" | grep -q "${opt}="; then # <-- LINE 200
                        echo "ERROR: Missing kernel config option: CONFIG_$opt"
                        err=1
                fi
        done
        if [ $err != 0 ]; then
                print_failure "Please recompile your kernel."
                exit 1
        fi
}

3. This bug doesn't reproduces each time when OpenVZ is restarted, but it does pretty often, say 3 times out of 5.