[LU-2514] racer: umount: /mnt/lustre2: device is busy

• Type: Bug
• Resolution: Won't Fix
• Priority: Blocker
• Affects Version/s: Lustre 2.1.4
• Environment: Lustre Tag: v2_1_4_RC1; Lustre Build: http://build.whamcloud.com/job/lustre-b2_1/159/; Distro/Arch: RHEL5.8/x86_64 + RHEL5.8/i686 (Server + Client)
• Severity: 3
• Assignee: WC Triage
• Reporter: Jian Yu

Description

After running racer test, cleaning up the Lustre filesystem failed as follows:

Stopping clients: client-32vm1,client-32vm2.lab.whamcloud.com /mnt/lustre2 (opts:)
CMD: client-32vm1,client-32vm2.lab.whamcloud.com running=\$(grep -c /mnt/lustre2' ' /proc/mounts);
if [ \$running -ne 0 ] ; then
echo Stopping client \$(hostname) /mnt/lustre2 opts:;
lsof -t /mnt/lustre2 || need_kill=no;
if [ x != x -a x\$need_kill != xno ]; then
    pids=\$(lsof -t /mnt/lustre2 | sort -u);
    if [ -n \"\$pids\" ]; then
             kill -9 \$pids;
    fi
fi;
busy=\$(umount  /mnt/lustre2 2>&1 | grep -c busy);
if [ \$busy -ne 0 ] ; then
    echo /mnt/lustre2 is still busy, wait one second && sleep 1;
    umount  /mnt/lustre2;
fi
fi
client-32vm1: umount: /mnt/lustre2: device is busy
client-32vm1: umount: /mnt/lustre2: device is busy
client-32vm2: umount: /mnt/lustre2: device is busy
client-32vm2: umount: /mnt/lustre2: device is busy
Stopping client client-32vm1.lab.whamcloud.com /mnt/lustre2 opts:
7597
16778
/mnt/lustre2 is still busy, wait one second
Stopping client client-32vm2.lab.whamcloud.com /mnt/lustre2 opts:
5040
7387
15521
19276
/mnt/lustre2 is still busy, wait one second

Maloo report: https://maloo.whamcloud.com/test_sets/e240df68-4acf-11e2-b87e-52540035b04c