[libvirt] [PATCH 0/5] Fix deadlock in nwfilter code

Since we introduced fine grained locking into the QEMU driver so that VM start can run in parallel, we appear to have caused a race with the nwfilter code. In particular since we no longer hold the global QEMU driver lock for the duration of VM startup we have a lock ordering flaw. This results in deadlock when nwfilter operations happen in parallel with VM startup. This also affects the LXC driver. This patch series attempts to address the problem https://bugzilla.redhat.com/show_bug.cgi?id=929412 the removal of the windows thread impl isn't strictly required, I just didn't want to waste time creating a read/write lock impl for Windows threads. Daniel P. Berrange (5): Add a read/write lock implementation Remove windows thread implementation in favour of pthreads Push nwfilter update locking up to top level Add a mutex to serialize updates to firewall Turn nwfilter conf update mutex into a read/write lock configure.ac | 15 +- src/Makefile.am | 4 - src/conf/nwfilter_conf.c | 23 +- src/conf/nwfilter_conf.h | 3 +- src/libvirt_private.syms | 8 +- src/lxc/lxc_driver.c | 6 + src/nwfilter/nwfilter_driver.c | 12 +- src/nwfilter/nwfilter_gentech_driver.c | 21 +- src/nwfilter/nwfilter_gentech_driver.h | 2 +- src/qemu/qemu_driver.c | 6 + src/uml/uml_driver.c | 4 + src/util/virthread.c | 291 +++++++++++++++++++++++- src/util/virthread.h | 51 ++++- src/util/virthreadpthread.c | 278 ----------------------- src/util/virthreadpthread.h | 49 ---- src/util/virthreadwin32.c | 396 --------------------------------- src/util/virthreadwin32.h | 53 ----- 17 files changed, 395 insertions(+), 827 deletions(-) delete mode 100644 src/util/virthreadpthread.c delete mode 100644 src/util/virthreadpthread.h delete mode 100644 src/util/virthreadwin32.c delete mode 100644 src/util/virthreadwin32.h -- 1.8.4.2