Fix: sessiond: assertion hit in ltt_sessions_ht_empty

Fix: sessiond: assertion hit in ltt_sessions_ht_empty

Observed issue
==============

Scenario:

gdb lttng-sessiond
  set non-stop
  break rotation-thread.cpp:584
  ^ simulates a slow rotation thread or not scheduled thread.

lttng create test1
lttng enable-event -u -a
lttng start test1
lttng create test2
lttng enable-event -u -a
lttng start test2
lttng destroy test1
   This will hang on rotation pending checks on the CLI side.

In another shell:

lttng destroy test2
   This will hang on rotation pending checks on the CLI side.

Back to gdb
   thread 7
   continue

Results in:

 #0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
 #1  0x00007ffff786c859 in __GI_abort () at abort.c:79
 #2  0x00007ffff786c729 in __assert_fail_base (fmt=0x7ffff7a02588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x5555556bb148 "count == lttng_ht_get_count(ltt_sessions_ht_by_name)", file=0x5555556bae9f "session.cpp", line=395, function=<optimized out>) at assert.c:92
 #3  0x00007ffff787e006 in __GI___assert_fail (assertion=0x5555556bb148 "count == lttng_ht_get_count(ltt_sessions_ht_by_name)", file=0x5555556bae9f "session.cpp", line=395, function=0x5555556bb129 "int ltt_sessions_ht_empty()") at assert.c:101
 #4  0x0000555555586d59 in ltt_sessions_ht_empty () at session.cpp:395
 #5  0x0000555555586e53 in del_session_ht (ls=0x7fffdc000c30) at session.cpp:418
 #6  0x0000555555588a95 in session_release (ref=0x7fffdc001e50) at session.cpp:999
 #7  0x000055555558620f in urcu_ref_put (ref=0x7fffdc001e50, release=0x5555555886eb <session_release(urcu_ref*)>) at /home/joraj/lttng/master/install/include/urcu/ref.h:68
 #8  0x0000555555588c8f in session_put (session=0x7fffdc000c30) at session.cpp:1048
 #9  0x00005555555bf995 in handle_job_queue (handle=0x55555575d260, state=0x7fffeeffc240, queue=0x555555758960) at rotation-thread.cpp:612
 #10 0x00005555555c05da in thread_rotation (data=0x55555575d260) at rotation-thread.cpp:847
 #11 0x00005555555c3b1c in launch_thread (data=0x55555575d2f0) at thread.cpp:66
 #12 0x00007ffff7a46609 in start_thread (arg=<optimized out>) at pthread_create.c:477
 #13 0x00007ffff7969163 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Other scenarios can lead to a similar backtrace when using the
`--no-wait` lttng destroy option.

Cause
=====

Since ed41e5709047ef545aa28082416e641e003b45e0 [1], hash table removal
for the session object for the `ltt_sessions_ht_by_name` and
`ltt_sessions_ht_by_name` are "decoupled". Removal from
`ltt_sessions_ht_by_name` is done early in `session_destroy()` while
removal from `ltt_sessions_ht_by_id` is done during `session_release` when
the last reference of a session object is released.

This can leads to `imbalances` between the size of the two hash tables
when multiple sessions are at play.

Solution
========

Rework `ltt_sessions_ht_empty()` to exit early when
`ltt_sessions_ht_by_id` is not empty. Perform a sanity check on
`ltt_sessions_ht_by_name` only when `ltt_sessions_ht_by_id` is empty.

Note
========

Ideally both hash tables' lifetime would be managed separately but it
seems easier in term of initialization to bundle them together for now
considering the limited scope of the `ltt_sessions_ht_by_name` hash
table.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I66c459f80298f929add703ac977cccd1da6dd556