[LU-1894] sanity test 180b fails to detach and remove obdecho module

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Trivial
• Severity: 3
• Assignee: WC Triage
• Reporter: Oleg Drokin

Description

I have been running some testing recently and caught this:

== sanity test 180b: test obdecho directly on obdfilter == 10:59:57 (1347375597)
New object id is 0x2
Print status every operation
test_brw: writing 10x64 pages (obj 0x2, off 0): Tue Sep 11 10:59:57 2012
test_brw: write number 1 @ 2:0 for 262144
test_brw: write number 2 @ 2:262144 for 262144
test_brw: write number 3 @ 2:524288 for 262144
test_brw: write number 4 @ 2:786432 for 262144
test_brw: write number 5 @ 2:1048576 for 262144
test_brw: write number 6 @ 2:1310720 for 262144
test_brw: write number 7 @ 2:1572864 for 262144
test_brw: write number 8 @ 2:1835008 for 262144
test_brw: write number 9 @ 2:2097152 for 262144
test_brw: write number 10 @ 2:2359296 for 262144
test_brw: wrote 10x64 pages in 0.280s (8.913 MB/s): Tue Sep 11 10:59:57 2012
ERROR: Module obdecho is in use
Resetting fail_loc on all nodes...done.
PASS 180b (0s)

Note the obdecho removal error.
I looked at the test code and it appears we forgot to detach echo client from filter so it's no wonders removal fails.