...as seen in the scenario described in 5997121a
"Support signal handlers registered with SA_SIGINFO", first

> src/client/linux/minidump_writer/directory_reader.h:82:19: runtime error: member access within misaligned address 0x7f3f8235c2cc for type 'struct kernel_dirent', which requires 8 byte alignment
> 0x7f3f8235c2cc: note: pointer points here
>   10 02 00 00 d8 f8 3b 00  00 00 00 00 01 00 00 00  00 00 00 00 18 00 2e 00  00 00 00 04 02 c7 3b 00

and then

> src/client/linux/minidump_writer/linux_dumper.cc:382:19: runtime error: member access within misaligned address 0x7f96c225d7bc for type 'google_breakpad::MappingInfo', which requires 8 byte alignment
> 0x7f96c225d7bc: note: pointer points here
>   20 0a 32 30 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
>               ^

Change-Id: I7f739567879093a404bee3e351ce9e8257676183