(feature/nanovdb) [BUG] access violation in dstLeaf->data()

[dm-tesla]

Environment

Operating System: Ubuntu 24.04 LTS
Version / Commit SHA: SHA: 4a186c2 (head of "feature/nanovdb")
Other: clang-18.1.3

Describe the bug

"misaligned pointer use" in this instruction

            auto *srcLeaf = srcLeafs[i];
            auto *dstLeaf = PtrAdd<DstNode0>(ptr, srcLeaf->mDstOffset);
            auto *data = dstLeaf->data(); // <<------ HERE
            srcLeaf->mDstNode = dstLeaf;

I believe it's coming from writeGrid, but the call stacks aren't always looking the same.

To Reproduce

All I'm doing is this:

         nanovdb::GridBuilder<float> builder(0.0f, nanovdb::GridClass::LevelSet);
        auto acc = builder.getAccessor();
        for (uint32_t z = 0; z < extent[2]; ++z)
        {
            for (uint32_t y = 0; y < extent[1]; ++y)
            {
                for (uint32_t x = 0; x < extent[0]; ++x)
                {
                    acc.setValue(nanovdb::Coord(x, y, z), some_value);
                }
            }
        }
        nanovdb::io::writeGrid("grid.nvdb", builder.getHandle<>(), nanovdb::io::Codec::NONE);

Expected behavior

No crashes or access violations are expected.

Additional context

The grid size I used was 23x25x27
The template parameter for the grid is a custom type that has the size of 2 bytes.
The template parameter is just float

Call stack

__ubsan_on_report (Unknown Source:0)
__ubsan::Diag::~Diag() (Unknown Source:0)
handleTypeMismatchImpl(__ubsan::TypeMismatchData*, unsigned long, __ubsan::ReportOptions) (Unknown Source:0)
__ubsan_handle_type_mismatch_v1 (Unknown Source:0)
std::enable_if<!is_same<nanovdb::Fp4, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp8, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp16, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::FpN, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value, void>::type nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::processLeafs<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf>(std::vector<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*, std::allocator<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*>>&)::'lambda'(nanovdb::Range<1, unsigned long> const&)::operator()(nanovdb::Range<1, unsigned long> const&) const (deps/nanovdb/nanovdb/util/GridBuilder.h:704)
nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf std::__invoke_impl<void, std::enable_if<!is_same<nanovdb::Fp4, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp8, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp16, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::FpN, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value, void>::type nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::processLeafs<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf>(std::vector<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*, std::allocator<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*>>&)::'lambda'(nanovdb::Range<1, unsigned long> const&), nanovdb::Range<1, unsigned long>>(std::__invoke_other, std::enable_if<!is_same<nanovdb::Fp4, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp8, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp16, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::FpN, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value, void>::type nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::processLeafs<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf>(std::vector<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*, std::allocator<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*>>&)::'lambda'(nanovdb::Range<1, unsigned long> const&)&&, nanovdb::Range<1, unsigned long>&&) (/usr/include/c++/13/bits/invoke.h:61)
std::__invoke_result<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf, nanovdb::Range<1, unsigned long>>::type std::__invoke<std::enable_if<!is_same<nanovdb::Fp4, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp8, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp16, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::FpN, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value, void>::type nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::processLeafs<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf>(std::vector<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*, std::allocator<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*>>&)::'lambda'(nanovdb::Range<1, unsigned long> const&), nanovdb::Range<1, unsigned long>>(nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf&&, nanovdb::Range<1, unsigned long>&&) (/usr/include/c++/13/bits/invoke.h:96)
void std::thread::_Invoker<std::tuple<std::enable_if<!is_same<nanovdb::Fp4, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp8, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp16, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::FpN, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value, void>::type nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::processLeafs<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf>(std::vector<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*, std::allocator<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*>>&)::'lambda'(nanovdb::Range<1, unsigned long> const&), nanovdb::Range<1, unsigned long>>>::_M_invoke<0ul, 1ul>(std::_Index_tuple<0ul, 1ul>) (/usr/include/c++/13/bits/std_thread.h:292)
std::thread::_Invoker<std::tuple<std::enable_if<!is_same<nanovdb::Fp4, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp8, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp16, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::FpN, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value, void>::type nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::processLeafs<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf>(std::vector<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*, std::allocator<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*>>&)::'lambda'(nanovdb::Range<1, unsigned long> const&), nanovdb::Range<1, unsigned long>>>::operator()() (/usr/include/c++/13/bits/std_thread.h:299)
std::thread::_State_impl<std::thread::_Invoker<std::tuple<std::enable_if<!is_same<nanovdb::Fp4, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp8, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::Fp16, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value && !is_same<nanovdb::FpN, nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf::BuildType>::value, void>::type nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::processLeafs<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf>(std::vector<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*, std::allocator<nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::BuildLeaf*>>&)::'lambda'(nanovdb::Range<1, unsigned long> const&), nanovdb::Range<1, unsigned long>>>>::_M_run() (/usr/include/c++/13/bits/std_thread.h:244)
___lldb_unnamed_symbol8048 (Unknown Source:0)
___lldb_unnamed_symbol3670 (Unknown Source:0)
___lldb_unnamed_symbol4062 (Unknown Source:0)

Another call stack:

__ubsan_on_report (Unknown Source:0)
__ubsan::Diag::~Diag() (Unknown Source:0)
handleTypeMismatchImpl(__ubsan::TypeMismatchData*, unsigned long, __ubsan::ReportOptions) (Unknown Source:0)
__ubsan_handle_type_mismatch_v1 (Unknown Source:0)
nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::processTree() (deps/nanovdb/nanovdb/util/GridBuilder.h:937)
nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::processGrid(nanovdb::Map const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&) (deps/nanovdb/nanovdb/util/GridBuilder.h:990)
nanovdb::GridHandle<nanovdb::HostBuffer> nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::getHandle<nanovdb::AbsDiff, nanovdb::HostBuffer>(nanovdb::Map const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, nanovdb::AbsDiff const&, nanovdb::HostBuffer const&) (deps/nanovdb/nanovdb/util/GridBuilder.h:586)
nanovdb::GridHandle<nanovdb::HostBuffer> nanovdb::GridBuilder<float, float, nanovdb::Stats<float, 0>>::getHandle<nanovdb::AbsDiff, nanovdb::HostBuffer>(double, nanovdb::Vec3<double> const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, nanovdb::AbsDiff const&, nanovdb::HostBuffer const&) (deps/nanovdb/nanovdb/util/GridBuilder.h:559)
main::$_0::operator()(tesla::sim::Voxel const*, std::array<unsigned int, 3ul>, AxisAlignedBoundingBox) const (src/bin/voxelizer.cpp:130)