Well, GDB assumes that the VDSO contains the whole ELF *file*, not just
segments that would be loaded into memory if the object were loaded by
the dynamic loader.
In particular, none of the symbol table (.symtab, .strtab) or debug info
sections usually reside in loaded segments, but the debugger of course
has to access them.
When debugging "normal" executables or shared librares, GDB will just
read that information from the file on disk. But for a VSDO, no such
file exists; instead, GDB assumes the full file is actually present in
memory.
("Full file" here means everything covered by any *section*, not just
those that are part of a loaded segment.)
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https://bugs.launchpad.net/bugs/1365664
Title:
gdb source test suites are failing in Ubuntu14.10
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