[ovs-build] Failed: ovsrobot/ovs#2290 (series_160816 - 9920f90)

[Travis CI]

Build Update for ovsrobot/ovs
-------------------------------------

Build: #2290
Status: Failed

Duration: 29 mins and 47 secs
Commit: 9920f90 (series_160816)
Author: Yanqin Wei
Message: lib: use acquire-release semantics for pvector size

Read/write concurrency of pvector library is implemented by a temp vector
and RCU protection. Considering performance reason, insertion does not
follow this scheme.
In insertion function, a thread fence ensures size incrementation is done
after new entry is stored. But there is no barrier in the iteration
fuction(pvector_cursor_init). Entry point access may be reorderd before
loading vector size, so the invalid entry point may be loaded when vector
iteration.
This patch fixes it by acquire-release pair. It can guarantee new size is
observed by reader after new entry stored by writer. And this is
implemented by one-way barrier instead of two-way memory fence.

Reviewed-by: Gavin Hu <Gavin.Hu at arm.com>
Reviewed-by: Lijian Zhang <Lijian.Zhang at arm.com>
Signed-off-by: Yanqin Wei <Yanqin.Wei at arm.com>
Signed-off-by: 0-day Robot <robot at bytheb.org>

View the changeset: https://github.com/ovsrobot/ovs/compare/f4f7498a9e17^...9920f90b4cca

View the full build log and details: https://travis-ci.org/ovsrobot/ovs/builds/655151668?utm_medium=notification&utm_source=email

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