[PATCH v2 00/13] resolve hangs/crashes on libvirtd shutdown

[Nikolay Shirokovskiy]

one more time

Sorry if this is on somebody's yet to be reviewed patches stack. It is not
clear now in current workflow if this patch track lost or not.

On 06.08.2020 17:10, Nikolay Shirokovskiy wrote:
> polite ping
> 
> On 23.07.2020 13:14, Nikolay Shirokovskiy wrote:
>> I keep qemu VM event loop exiting synchronously but add code to avoid deadlock
>> that can be caused by this approach. I guess it is worth having synchronous
>> exiting of threads in this case to avoid crashes.
>>
>> Patches that are already positively reviewed has appropriate 'Reviewed-by' lines.
>>
>> Changes from v1:
>> - rename stateShutdown to state stateShutdownPrepare
>> - introduce net daemon shutdown callbacks
>> - make some adjustments in terms of qemu per VM's event loop thread
>>   finishing
>> - factor out net server shutdown facilities into distinct patch
>> - increase shutdown timeout from 15s to 30s
>>
>> Nikolay Shirokovskiy (13):
>>   libvirt: add stateShutdownPrepare/stateShutdownWait to drivers
>>   util: always initialize priority condition
>>   util: add stop/drain functions to thread pool
>>   rpc: don't unref service ref on socket behalf twice
>>   rpc: add virNetDaemonSetShutdownCallbacks
>>   rpc: add shutdown facilities to netserver
>>   rpc: finish all threads before exiting main loop
>>   qemu: don't shutdown event thread in monitor EOF callback
>>   vireventthread: exit thread synchronously on finalize
>>   qemu: avoid deadlock in qemuDomainObjStopWorker
>>   qemu: implement driver's shutdown/shutdown wait methods
>>   rpc: cleanup virNetDaemonClose method
>>   util: remove unused virThreadPoolNew macro
>>
>>  scripts/check-drivername.py   |   2 +
>>  src/driver-state.h            |   8 ++++
>>  src/libvirt.c                 |  42 ++++++++++++++++
>>  src/libvirt_internal.h        |   2 +
>>  src/libvirt_private.syms      |   4 ++
>>  src/libvirt_remote.syms       |   2 +-
>>  src/qemu/qemu_domain.c        |  18 +++++--
>>  src/qemu/qemu_driver.c        |  32 +++++++++++++
>>  src/qemu/qemu_process.c       |   3 --
>>  src/remote/remote_daemon.c    |   6 +--
>>  src/rpc/virnetdaemon.c        | 109 ++++++++++++++++++++++++++++++++++++------
>>  src/rpc/virnetdaemon.h        |   8 +++-
>>  src/rpc/virnetserver.c        |   8 ++++
>>  src/rpc/virnetserver.h        |   1 +
>>  src/rpc/virnetserverservice.c |   1 -
>>  src/util/vireventthread.c     |   1 +
>>  src/util/virthreadpool.c      |  65 +++++++++++++++++--------
>>  src/util/virthreadpool.h      |   6 +--
>>  18 files changed, 267 insertions(+), 51 deletions(-)
>>
>