[PATCH v2 0/2] kunit: add optional assertions to catch taint and lockdep warnings

this patch tries to expand KUnit by using existing kernel diagnostics to
catch certain locking related bugs. Specifically this adds assertions for
`debug_locks` from `lockdep` and the `TAINT_WARN` flag from `panic`.
This tries to prevent bugs as: circular locking dependency and sleeping
function called from invalid context. 

Add config CONFIG_KUNIT_EXTRA_ASSERTS that enables extra assertions
to be emitted: First, before _any_ KUnit test suite is ran, this is to ensure
that the extra assertions are triggered by a KUnit test and not prior.
Secondly, assertions a made for each test case, failing them if the
assertions fail, even if the KUnit test is marked as passed.

Signed-off-by: Malte Wechter <[email protected]>
---
Changes in v2:
- Implement changes directly in C KUnit instead of Rust KUnit wrapper
- Remove rust specific configs and add general CONFIG_KUNIT_EXTRA_ASSERTS config
- Link to v1: https://patch.msgid.link/[email protected]

To: Brendan Higgins <[email protected]>
To: David Gow <[email protected]>
To: Rae Moar <[email protected]>
To: Miguel Ojeda <[email protected]>
To: Boqun Feng <[email protected]>
To: Gary Guo <[email protected]>
To: Björn Roy Baron <[email protected]>
To: Benno Lossin <[email protected]>
To: Andreas Hindborg <[email protected]>
To: Alice Ryhl <[email protected]>
To: Trevor Gross <[email protected]>
To: Danilo Krummrich <[email protected]>
To: Daniel Almeida <[email protected]>
To: Tamir Duberstein <[email protected]>
To: Alexandre Courbot <[email protected]>
To: Onur Özkan <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

---
Malte Wechter (2):
      kunit: add extra assertions to KUnit test cases
      kunit: add KUnit test to assert kernel state before KUnit suites are run

 lib/kunit/Kconfig     | 12 ++++++++++++
 lib/kunit/executor.c  |  8 +++++++-
 lib/kunit/test.c      | 30 ++++++++++++++++++++++++++++++
 lib/kunit/try-catch.c | 23 ++++++++++++++++++++++-
 4 files changed, 71 insertions(+), 2 deletions(-)
---
base-commit: 8cdeaa50eae8dad34885515f62559ee83e7e8dda
change-id: 20260812-lockdep-kunit-9628f4bcad90

Best regards,
--  
Malte Wechter <[email protected]>