Cherry-picks for 10.2.0 RC1 (2026-08-12)

include/shared/cache_shm/Layout.h

@@ -87,13 +87,26 @@ constexpr std::size_t CONTROL_HEADER_SIZE = offsetof(CacheShmControl, stripes);
 static_assert(CONTROL_HEADER_SIZE == 48, "the control segment header is a frozen layout; see the comment above");
 static_assert(std::is_standard_layout_v<CacheShmControl>, "the control segment is shared across processes and builds");
 
-// Whether a control segment of `actual` bytes was written by *this* build; the kernel rounds an shm object up to a page.
-// Anything larger has a stripes[] of unknown stride and must never be walked with our layout. Shared by the attach gate,
-// the purge primitive and `traffic_ctl cache shm status` so the three cannot drift apart.
+/// Whether @a actual is the object size this platform reports after truncating
+/// a POSIX shared-memory object to @a requested bytes.
+inline bool
+is_expected_shm_size(std::size_t actual, std::size_t requested)
+{
+#if defined(__APPLE__)
+  // macOS rounds the reported object size up to the VM page size.
+  return actual >= requested && actual <= INK_ALIGN(requested, ats_pagesize());
+#else
+  return actual == requested;
+#endif
+}
+
+// Whether a control segment of `actual` bytes was written by *this* build. Anything else has a stripes[] of unknown
+// stride and must never be walked with our layout. Shared by the attach gate, the purge primitive and
+// `traffic_ctl cache shm status` so the three cannot drift apart.
 inline bool
 is_own_control_size(std::size_t actual)
 {
-  return actual >= CONTROL_SIZE && actual <= INK_ALIGN(CONTROL_SIZE, ats_pagesize());
+  return is_expected_shm_size(actual, CONTROL_SIZE);
 }
 
 // Frame the operator's middle word (e.g. "ats") as "/<word>-". The framing is supplied here so it cannot be mis-typed:

include/shared/cache_shm/Purge.h

@@ -286,10 +286,9 @@ purge_segments(const std::string &prefix)
     return report;
   }
 
-  // Larger than this build's page-rounded CONTROL_SIZE means a build with a different
-  // sizeof(CacheShmControl) wrote it. The frozen header prefix is still readable (so
-  // the owner guard above applies), but stripes[] may have a different stride entirely,
-  // so its names must not drive shm_unlink.
+  // A control size this build does not accept means a build with a different sizeof(CacheShmControl) wrote it. The frozen
+  // header prefix is still readable (so the owner guard above applies), but stripes[] may have a different stride
+  // entirely, so its names must not drive shm_unlink.
   if (magic_ok && is_own_control_size(static_cast<std::size_t>(sb.st_size))) {
     unlink_table_stripes(prefix, ctrl, report.unlinked);
   } else {

lib/fastlz/fastlz.cc

@@ -162,7 +162,7 @@ static void flz_smallcopy(uint8_t* dest, const uint8_t* src, uint32_t count) {
 }
 
 /* special case of memcpy: exactly MAX_COPY bytes */
-static void flz_maxcopy(void* dest, const void* src) {
+static void flz_maxcopy(uint8_t* dest, const uint8_t* src) {
 #if defined(FLZ_ARCH64)
   const uint32_t* p = (const uint32_t*)src;
   uint32_t* q = (uint32_t*)dest;

lib/swoc/unit_tests/test_bw_format.cc

@@ -525,7 +525,7 @@ TEST_CASE("bwstring std formats", "[libswoc][bwprint]") {
 
   w.print("{}", swoc::bwf::Errno(13));
   REQUIRE(w.view() == "EACCES: Permission denied [13]"sv);
-  w.clear().print("{}", swoc::bwf::Errno(134));
+  w.clear().print("{}", swoc::bwf::Errno(192));
   REQUIRE(w.view().substr(0, 22) == "Unknown: Unknown error"sv);
   w.clear().print("{:s}", swoc::bwf::Errno(13));
   REQUIRE(w.view() == "EACCES: Permission denied"sv);