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1. Replace stacktraceRe with custom code which is more flexible.
stacktraceRe stumbled on any unrelated lines and
could not properly parse truncated stacks.
2. Match report regexp earlier.
If we match simler title regexp, but don't match
report regexp or fail to parse stack trace, the report is corrupted.
This eliminates lots of duplicate corrupted oops entries,
which were there only because we had complex regexp's in titles.
3. Ignore low-level frames during stack parsing.
E.g. we never want to report a GPF in lock_acquire or memcpy
(somewhat similar to what we do for guilty files).
4. Add a bunch of specialized formats for WARNINGs.
There is number of generic debugging facilities (like ODEBUG,
debug usercopy, kobject, refcount_t, etc), and the bug
is never in these facilities, it's in the caller instead.
5. Improve some other oops formats.
6. Add a bunch of additional tests.
This resolves most of TODOs in tests.
Fixes #515
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