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authorBrian Foster <bfoster@redhat.com>2013-10-18 07:36:38 -0400
committerAnand Avati <avati@redhat.com>2013-11-10 23:45:46 -0800
commitb06ecde2997b72a41b2f2d25d55e61d30ea46bc2 (patch)
treeff630d050b46310141d0ca11ee56b04736d06cea /NEWS
parent0826f9073a93c6d499f3d2077695455854d0fa7f (diff)
features/qemu-block: simplify coroutine model to use single synctask, ucontext
The current coroutine model, mapping synctasks 1-1 with qemu internal Coroutines, has some unresolved raciness issues. This problem usually manifests as lifecycle mismatches between top-level (gluster created) synctasks and the subsequently created internal coroutines from that context. Qemu's internal queueing (and locking) can cause situations where the top-level synctask is destroyed before the internal scheduler has released references to memory, leading to use after free crashes and asserts. Simplify the coroutine model to use a single synctask as a coroutine processor and rely on the existing native ucontext coroutine implementation. The syncenv thread is donated to qemu and ensures a single top-level coroutine is processed at a time. Qemu now has complete control over coroutine scheduling. BUG: 986775 Change-Id: I38223479a608d80353128e390f243933fc946fd6 Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-on: http://review.gluster.org/6110 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
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