When re-setting (SET GLOBAL debug='') the GLOBAL debug settings the
server was not freeing the data elements from the top (initial) frame
before setting them to 0 without freeing the underlying memory. As these
are global settings there's a chance that something is there already.
Fixed by :
1. making sure the allocated data are cleaned up before re-setting them
while parsing a debug string
2. making sure the stuff allocated in the global settings is freed on
shutdown.
Bug#34678 @@debug variable's incremental mode
The problem is that the per-thread debugging settings stack wasn't
being deallocated before the thread termination, leaking the stack
memory. The chosen solution is to push a new state if the current
is set to the initial settings and pop it (free) once the thread
finishes.
dbug/dbug.c:
Move dbug parser out of _db_set_ to a separate function and
make _db_set_ push a new stack if the corrent one is set to
the initial settings.
dbug/user.r:
Update DBUG_SET description.
mysql-test/t/disabled.def:
Re-enable test case which triggered the leak.
mysys/my_thr_init.c:
Pop a pushed state, nop if stack is empty.
sql/set_var.cc:
Handle incremental debug settings.
mysql-test/r/variables_debug.result:
Add new test case result for Bug#34678
mysql-test/t/variables_debug.test:
Add new test case for Bug#34678
