[libvirt] [PATCH 0/9] Resolve libvirtd hang on termination with connected long running client

[John Ferlan]

RFC:
https://www.redhat.com/archives/libvir-list/2018-January/msg00318.html

Adjustments since RFC...

Patches 1&2: No change, were already R-B'd
Patch 3: Removed code as noted in code review, update commit message
Patch 4: From old series removed, see below for more details
Patch 9: no change
NB: Patches 5-8 and 10 from Nikolay Shirokovskiy <nshirokovskiy at virtuozzo.com>
    are removed as they seemed to not be necessary

Replaced the former patch 4 with series of patches to (slowly) provide
support to disable new connections, handle removing waiting jobs, causing
the waiting workers to quit, and allow any running jobs to complete.

As it turns out, waiting for running jobs to complete cannot be done
from the virNetServerClose callbacks because that means the event loop
processing done during virNetServerRun will not allow any currently
long running worker job thread a means to complete.

So when virNetDaemonQuit is called as a result of the libvirtd signal
handlers for SIG{QUIT|INT|TERM}, instead of just causing virNetServerRun
to quit immediately, alter to using a quitRequested flag and then use
that quitRequested flag to check for long running worker threads before
causing the event loop to quit resulting in libvirtd being able to run
through the virNetDaemonClose processing.

John Ferlan (9):
  libvirtd: Alter refcnt processing for domain server objects
  libvirtd: Alter refcnt processing for server program objects
  netserver: Remove ServiceToggle during ServerDispose
  util: Introduce virThreadPoolDrain
  rpc: Introduce virNetServerQuitRequested
  rpc: Introduce virNetServerWorkerCount
  rpc: Alter virNetDaemonQuit processing
  docs: Add news article for libvirtd issue
  APPLY ONLY FOR TESTING PURPOSES

 daemon/libvirtd.c        | 43 +++++++++++++++++++++++---------
 docs/news.xml            | 12 +++++++++
 src/libvirt_private.syms |  1 +
 src/libvirt_remote.syms  |  2 ++
 src/qemu/qemu_driver.c   |  5 ++++
 src/rpc/virnetdaemon.c   | 45 +++++++++++++++++++++++++++++++++-
 src/rpc/virnetserver.c   | 52 ++++++++++++++++++++++++++++++++++++---
 src/rpc/virnetserver.h   |  4 +++
 src/util/virthreadpool.c | 64 ++++++++++++++++++++++++++++++++++++++++--------
 src/util/virthreadpool.h |  2 ++
 10 files changed, 204 insertions(+), 26 deletions(-)

-- 
2.13.6