This is still happening on xenial, although it seems to be happening on
s390x now, so I decided to investigate why.
I reserved two s390x instances running xenial on canonistack and used
them to run the dep8 tests. On the first machine, after dget'ing the
source package for nfs-utils and rebuilding it locally, I did:
# adt-run -o dep8 -B ./nfs-utils_1.2.8-9ubuntu12.3.dsc --- ssh -H
10.48.132.122 -l ubuntu -r
Where 10.48.132.122 is the IP address of the *second* machine. This
assumes that everything is properly configured there: sudo, ssh keys.
When I do this, I get the exact same error message as the reporter.
After analyzing a lot of debug logs (using "rpcdebug -m nfs -s all",
"rpcdebug -m nfsd -s all", "rpcdebug -m rpc -s all"), I finally found
that the problem are the lease and the grace times used by nfsd. There
are various reports on the internet about problems very similar to this
one and that are caused by the same reason.
Since we're dealing with a relatively old nfsd, which doesn't support
the --lease-time nor --grace-time options, the only way to adjust these
parameters is through /proc/fs/nfsd/. That's what I did.
The fix for this problem is relatively simple. On debian/tests/local-
server-client, right at the start of the "post_boot_tests" function, we
have to do:
systemctl stop nfs-server.service
echo 10 > /proc/fs/nfsd/nfsv4leasetime
echo 10 > /proc/fs/nfsd/nfsv4gracetime
systemctl start nfs-server.service
After this, I see the test passing for me:
adt-run [14:25:43]: test local-server-client: -----------------------]
adt-run [14:25:44]: test local-server-client: - - - - - - - - - - results - -
- - - - - - - -
local-server-client PASS
adt-run [14:25:44]: @@@@@@@@@@@@@@@@@@@@ summary
local-server-client PASS
Since this is happening on xenial, I don't believe a SRU is justified to
fix this issue. Therefore, I will propose that we force-badtest this
particular test instead. I'm writing this comment more as a reference.
** Changed in: nfs-utils (Ubuntu)
Importance: Undecided => Low
** Changed in: nfs-utils (Ubuntu)
Status: New => Confirmed
** Also affects: nfs-utils (Ubuntu Xenial)
Importance: Undecided
Status: New
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1705483
Title:
ADT tests periodically failing on amd64 - file exists after removal
Status in nfs-utils package in Ubuntu:
Confirmed
Status in nfs-utils source package in Xenial:
New
Bug description:
http://autopkgtest.ubuntu.com/packages/nfs-utils/artful/amd64
You can see that sometimes the ADT tests fail. With retries working.
FAIL: /mnt/nfs_home/hello.txt exists after removal
autopkgtest [06:24:45]: test local-server-client: -----------------------]
autopkgtest [06:24:46]: test local-server-client: - - - - - - - - - -
results - - - - - - - - - -
local-server-client FAIL non-zero exit status 1
autopkgtest [06:24:46]: test local-server-client: - - - - - - - - - - stderr
- - - - - - - - - -
FAIL: /mnt/nfs_home/hello.txt exists after removal
autopkgtest [06:24:46]: @@@@@@@@@@@@@@@@@@@@ summary
local-server-client FAIL non-zero exit status 1
Exit request sent.
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