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Potential unaligned memory access causes bus error on ARM #10782

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Potential unaligned memory access causes bus error on ARM#10782
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affects-6.1This bug affects the 6.1.x(LTS) versions.affects-6.5This bug affects the 6.5.x(LTS) versions.affects-7.1This bug affects the 7.1.x(LTS) versions.affects-7.5This bug affects the 7.5.x(LTS) versions.affects-8.1This bug affects the 8.1.x(LTS) versions.affects-8.5This bug affects the 8.5.x(LTS) versions.affects-9.0This bug affects the 9.0.x versions.severity/majortype/bugThe issue is confirmed as a bug.
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@gengliqi
gengliqi
opened on Mar 31, 2026

Bug Report

tiflash/dbms/src/Columns/ColumnString.h

Line 250 in 9433514

const size_t string_size = *reinterpret_cast<const size_t *>(pos);

tiflash/dbms/src/Columns/ColumnArray.cpp

Line 214 in 9433514

size_t array_size = *reinterpret_cast<const size_t *>(pos);

tiflash/dbms/src/Interpreters/Aggregator.h

Line 395 in 2a198f1

const size_t string_size = *reinterpret_cast<const size_t *>(pos);

These raw pointer reads may dereference non-aligned addresses, which is unsafe on strict-alignment ARM systems and can cause bus errors.

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    affects-6.1This bug affects the 6.1.x(LTS) versions.affects-6.5This bug affects the 6.5.x(LTS) versions.affects-7.1This bug affects the 7.1.x(LTS) versions.affects-7.5This bug affects the 7.5.x(LTS) versions.affects-8.1This bug affects the 8.1.x(LTS) versions.affects-8.5This bug affects the 8.5.x(LTS) versions.affects-9.0This bug affects the 9.0.x versions.severity/majortype/bugThe issue is confirmed as a bug.

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