makeGroup()'s existing-group update path (hit whenever a config-push
re-applies a group name that already has members, e.g. a retried config
push during controller failover) released xce_g_member_t.u.name via
FREEUP() (plain free()). u.name is allocated by makeString(), an
rtti-managed, refcounted pointer that is not a malloc()-base address --
freeing it directly corrupts the heap. group_killer() in the same file
already releases the identical field correctly via dereference().
Switch both FREEUP(m->u.name) call sites to dereference(m->u.name) to
match. Add a regression test that re-applies config for the same group
name twice, reproducing the exact ASAN bad-free at group.c:234 pre-fix.
This is the root cause of the reproducible xce_scheduler
"free(): invalid pointer" SIGABRT crashes seen during 3-attempt
controller-failover config-push retries (8 confirmed core dumps).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
