qa: make rbd-fuse exit cleanly with lttng

lttng requires daemons (things that call fork, clone, or daemon
without exec, like fuse) to use a LD_PRELOAD library. Without this,
the lttng atexit() handler crashes.

Signed-off-by: Josh Durgin <jdurgin@redhat.com>

diff --git a/qa/workunits/rbd/merge_diff.sh b/qa/workunits/rbd/merge_diff.sh
index 9f84d59302c50d1e48d5a4aee5c468a6de136f41..7fbcd2f9c86ecb601d82c2c3e7d9c40368de0681 100755 (executable)
--- a/qa/workunits/rbd/merge_diff.sh
+++ b/qa/workunits/rbd/merge_diff.sh
@@ -33,7 +33,8 @@ function rebuild()
   rbd create $gen --size 100 --order $1 --stripe_unit $2 --stripe_count $3 --image-format $4
   rbd create $out --size 1 --order 19
   mkdir -p mnt diffs
-  rbd-fuse -p $pool mnt
+  # lttng has atexit handlers that need to be fork/clone aware
+  LD_PRELOAD=liblttng-ust-fork.so.0 rbd-fuse -p $pool mnt
 }
 
 function write()