Paweł Dziepak 5dfa36c526 lsa: add basic sanitizer ...

LSA being an allocator built on top of the standard may hide some
erroneous usage from AddressSanitizer. Moreover, it has its own classes
of bugs that could be caused by incorrect user behaviour (e.g. migrator
returning wrong object size).

This patch adds basic sanitizer for the LSA that is active in the debug
mode and verifies if the allocator is used correctly and if a problem is
found prints information about the affected object that it has collected
earlier. Theat includes the address and size of an object as well as
backtrace of the allocation site. At the moment the following errors are
being checked for:
 * leaks, objects not freed at region destructor
 * attempts to free objects at invalid address
 * mismatch between object size at allocation and free
 * mismatch between object size at allocation and as reported by the
   migrator
 * internal LSA error: attempt to allocate object at already used
   address
 * internal LSA error: attempt to merge regions containing allocated
   objects at conflicting addresses

Message-Id: <20180226122314.32049-1-pdziepak@scylladb.com>

2018-02-26 14:35:13 +02:00

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