[Bugs] [Bug 1181048] New: lockless lookup cause disk to be kicked out

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1181048

            Bug ID: 1181048
           Summary: lockless lookup cause disk to be kicked out
           Product: GlusterFS
           Version: mainline
         Component: disperse
          Severity: urgent
          Assignee: bugs at gluster.org
          Reporter: lidi at perabytes.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Version-Release number of selected component (if applicable):
mainline and any version with disperse

How reproducible:


Steps to Reproduce:
1. create a disperse volume with 3 disks, mount it to /cluster2/test
2. mkdir -p /cluster2/a/b/c
3. on one console execute 'for ((;;));do dd if=/dev/zero
of=/cluster2/test/a/b/c/aa bs=1M count=200;done'
4. on another execute 'ls /cluster2/test/a/b/c/aa' many times

Actual results:
one disk was kicked out



Additional info:
[2015-01-12 09:08:02.050709] W [ec-combine.c:801:ec_combine_check]
0-test-disperse-0: Mismatching xdata in answers of 'LOOKUP'
[2015-01-12 09:08:02.052371] W [ec-common.c:162:ec_check_status]
0-test-disperse-0: Operation failed on some subvolumes (up=7, mask=7,
remaining=0, good=5, bad=2)
[2015-01-12 09:08:02.052479] I [ec-heal.c:546:ec_heal_init] 0-ec: Healing
'/a/b/c/aa', gfid 658bbea7-c18d-48e5-9a54-21549bdb31eb
[2015-01-12 09:08:02.054985] W [ec-combine.c:76:ec_iatt_combine]
0-test-disperse-0: Failed to combine iatt (inode:
11120550027160400363-11120550027160400363, links: 1-1, uid: 0-0, gid: 0-0,
rdev: 0-0, size: 104857600-0, mode: 100644-100644)
[2015-01-12 09:08:02.055086] N [ec-generic.c:819:ec_combine_lookup]
0-test-disperse-0: Mismatching iatt in answers of 'GF_FOP_LOOKUP'
[2015-01-12 09:08:32.741658] W [ec-combine.c:801:ec_combine_check]
0-test-disperse-0: Mismatching xdata in answers of 'LOOKUP'
[2015-01-12 09:08:32.742744] W [ec-combine.c:801:ec_combine_check]
0-test-disperse-0: Mismatching xdata in answers of 'LOOKUP'
[2015-01-12 09:08:32.742803] W [ec-common.c:162:ec_check_status]
0-test-disperse-0: Operation failed on some subvolumes (up=7, mask=7,
remaining=0, good=6, bad=1)

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