AddressSanitizer: CHECK failed: asan_allocator.cpp:190 "((old)) == ((kAllocBegMagic))"

[fawltylanguage]

I got the following error in my program with Clang 19.1.0:

AddressSanitizer: CHECK failed: asan_allocator.cpp:190 "((old)) == ((kAllocBegMagic))" (0xffffffffcc6e9601, 0xcc6e96b9cc6e96b9) (tid=452908)
    #0 0x55d2d2f97f31 in __asan::CheckUnwind() .../llvm/llvm-project-19.1.0.src/compiler-rt/lib/asan/asan_rtl.cpp:69:3
    #1 0x55d2d2fb2a82 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) .../llvm/llvm-proje\
ct-19.1.0.src/compiler-rt/lib/sanitizer_common/sanitizer_termination.cpp:86:5
    #2 0x55d2d2ef49ae in Set .../llvm/llvm-project-19.1.0.src/compiler-rt/lib/asan/asan_allocator.cpp:190:7
    #3 0x55d2d2ef49ae in __asan::QuarantineCallback::Recycle(__asan::AsanChunk*) const .../llvm/llvm-project-19.1.0.src/compiler-rt/lib/asan\
/asan_allocator.cpp:232:50
    #4 0x55d2d2ef46ec in __sanitizer::Quarantine<__asan::QuarantineCallback, __asan::AsanChunk>::DoRecycle(__sanitizer::QuarantineCache<__asan::QuarantineCallback>*, __asan::QuarantineCall\
\
back) .../llvm/llvm-project-19.1.0.src/compiler-rt/lib/asan/../sanitizer_common/sanitizer_quarantine.h:188:12
    #5 0x55d2d2ef431c in __sanitizer::Quarantine<__asan::QuarantineCallback, __asan::AsanChunk>::Recycle(unsigned long, __asan::QuarantineCallback) /usr/local/env/amd64-linux-clang19-alma8\
\
/build/libs/llvm/llvm-project-19.1.0.src/compiler-rt/lib/asan/../sanitizer_common/sanitizer_quarantine.h:176:5
    #6 0x55d2d2ef65fd in __sanitizer::Quarantine<__asan::QuarantineCallback, __asan::AsanChunk>::Put(__sanitizer::QuarantineCache<__asan::QuarantineCallback>*, __asan::QuarantineCallback, \
\
__asan::AsanChunk*, unsigned long) .../llvm/llvm-project-19.1.0.src/compiler-rt/lib/asan/../sanitizer_common/sanitizer_quarantine.h:107:7
    #7 0x55d2d2f8d0bb in free .../llvm/llvm-project-19.1.0.src/compiler-rt/lib/asan/asan_malloc_linux.cpp:53:3
...

My program runs cleanly with Clang 18.1.6 ASAN. Still, it may be a bug in my program, but how can I find it? The malloc/free pair in my code seems to be OK.