[lttng-dev] [PATCH lttng-ust] Bugfix for http://bugs.lttng.org/issues/745

[Paul Woegerer]

Since (at least) in the short term LD_AUDIT will not be able to make sem_wait()
in the static constructor go away I provide the following patch to fix
http://bugs.lttng.org/issues/745.

It works by making the process of forking mutual exclusive with base address
statedumping that happens from the ust_listener_thread.

I have tested this fix with several variations of (constrained) fork bombs
(including tests/regression/ust/daemon from lttng-tools) on x86_64, ARM(imx6q)
and powerpc(P4080DS). It works reliable. I could not find any issues with this
approach.

Paul Woegerer (1):
  Bugfix for #745 deadlock with baddr statedump+fork

 liblttng-ust/lttng-ust-comm.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

-- 
2.0.1