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new 04624351573 [fix](be ut) Skip custom memcpy on ARM+ASAN to fix
segfault at process startup (#63656)
04624351573 is described below
commit 04624351573ea14ae15e3ce06ba7b4e206643918
Author: heguanhui <[email protected]>
AuthorDate: Mon Jun 1 14:43:46 2026 +0800
[fix](be ut) Skip custom memcpy on ARM+ASAN to fix segfault at process
startup (#63656)
The glibc-compatibility module provides a custom memcpy implementation
(memcpy_aarch64.cpp) that overrides the global memcpy symbol via extern
"C". This is done to avoid dependency on a specific glibc symbol version
(e.g., memcpy@@GLIBC_2.14) for portability.
However, libpthread's __pthread_initialize_minimal() calls memcpy during
very early process startup — before main(), before C++ static
initialization, and before ASAN shadow memory is set up. When ASAN is
enabled, the custom memcpy accesses memory that ASAN shadow has not yet
mapped, resulting in SIGSEGV.
This only affects aarch64 + ASAN because:
RELEASE builds have no ASAN shadow memory checks
x86_64 + ASAN does not exhibit this crash (different shadow memory
layout and initialization timing)
Co-authored-by: root <root@DESKTOP-3AF37B>
---
be/src/glibc-compatibility/CMakeLists.txt | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/be/src/glibc-compatibility/CMakeLists.txt
b/be/src/glibc-compatibility/CMakeLists.txt
index 99c428ba132..370d7346691 100644
--- a/be/src/glibc-compatibility/CMakeLists.txt
+++ b/be/src/glibc-compatibility/CMakeLists.txt
@@ -59,7 +59,16 @@ if (GLIBC_COMPATIBILITY)
list(REMOVE_ITEM glibc_compatibility_sources musl/getrandom.c)
# NOTE(amos): sanitizers might generate memcpy references that are too
late to
# refer. Let's also extract memcpy definitions explicitly to avoid UNDEF
GLIBC 2.14.
- add_library(glibc-compatibility-explicit OBJECT musl/getrandom.c
${MEMCPY_SOURCE})
+ #
+ # NOTE: On ARM (aarch64) with ASAN, the custom memcpy (memcpy_aarch64.cpp)
overrides
+ # the global memcpy symbol. libpthread's __pthread_initialize_minimal()
calls memcpy
+ # before ASAN shadow memory is initialized, causing SIGSEGV. Skip custom
memcpy in
+ # this case and fall back to glibc's memcpy.
+ if (ARCH_ARM AND (CMAKE_BUILD_TYPE STREQUAL "ASAN_UT" OR CMAKE_BUILD_TYPE
STREQUAL "ASAN"))
+ add_library(glibc-compatibility-explicit OBJECT musl/getrandom.c)
+ else()
+ add_library(glibc-compatibility-explicit OBJECT musl/getrandom.c
${MEMCPY_SOURCE})
+ endif()
target_compile_options(glibc-compatibility-explicit PRIVATE -fPIC)
add_library(glibc-compatibility STATIC ${glibc_compatibility_sources})
target_compile_options(
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