[Bug]: UBSAN detects misaligned memory access in WalEntry::ReadAdv

[zpf121]

Is there an existing issue for the same bug?

• I have checked the existing issues.

Version or Commit ID

0.7.0

Other environment information

Actual behavior and How to reproduce it

Description:
When building with UndefinedBehaviorSanitizer (UBSAN), infinity fails to start with the following error:

runtime error: member access within misaligned address 0x7a4afc1e50a9
for type 'WalEntryHeader', which requires 8 byte alignment

Root Cause:
In WalEntry::ReadAdv(), the code uses reinterpret_cast to directly access the WAL entry header:

auto *header = reinterpret_cast<WalEntryHeader *>(const_cast<char *>(ptr));

Why it works on x86:
x86 CPUs can handle misaligned memory access (with performance penalty), so the bug doesn't manifest on x86_64. However:

Performance degradation on x86
Potential crashes on ARM
Risk of data corruption

Solution:
Use ReadBuf/ReadBufAdv and WriteBuf functions (which use memcpy) instead of direct struct access. These functions handle unaligned memory safely.

Files affected:
src/storage/wal/wal_entry_impl.cpp

Expected behavior

No response

Additional information

No response