fix(memtrack): classify unprefixed jemalloc builds as jemalloc

Distro libjemalloc is built without the je_ symbol prefix, so symbol
classification missed it and fell through to libc++ (jemalloc exports
operator new), leaving plain malloc/aligned_alloc unprobed. Match on
mallocx, which keeps its name in unprefixed builds and is unique to
jemalloc.

Author: not-matthias

crates/memtrack/src/allocators/static_linked.rs

@@ -10,7 +10,12 @@ impl AllocatorKind {
         match self {
             AllocatorKind::Libc => &["malloc", "free"],
             AllocatorKind::LibCpp => &["_Znwm", "_Znam", "_ZdlPv", "_ZdaPv"],
-            AllocatorKind::Jemalloc => &["_rjem_malloc", "je_malloc", "je_malloc_default"],
+            // "mallocx" covers unprefixed jemalloc builds (e.g. distro
+            // libjemalloc.so): the extended API keeps its name when the je_
+            // prefix is disabled, and no other allocator exports it.
+            AllocatorKind::Jemalloc => {
+                &["_rjem_malloc", "je_malloc", "je_malloc_default", "mallocx"]
+            }
             AllocatorKind::Mimalloc => &["mi_malloc_aligned", "mi_malloc", "mi_free"],
             AllocatorKind::Tcmalloc => &["tc_malloc", "tc_free", "tc_version"],
         }