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Build # 6824430038

Build Type

push

github

Committed by ligurio

Commit Message

LJ_GC64: Always snapshot functions for non-base frames.

Reported by Arseny Vakhrushev.
Analysis and fix contributed by Peter Cawley.

(cherry picked from commit ff1e72ace)

The problem is GC64-specific and could be reproduced with enabled
compiler options LUA_USE_ASSERT and LUA_USE_APICHECK.

The case with bug is the following: imagine we have a function that is
recorded to a trace and calls a built-in function that is not
JIT-compilable (see NYI) and therefore triggers exit to the interpreter,
and then it resumes tracing just after the call returns - this is trace
stitching. Then, within the call, we need the potential for a side
trace. Finally, we need that side exit to be taken enough times for the
exit to be compiled into a trace. This compilation hits the assertion
failure.

Sergey Kaplun:
  * minimized reproducer made by fuzzing test

Sergey Bronnikov:
  * added the description (see a comment in the test)
  * added tests for the problem: first one based on the original
    reproducer and second one based on a reproducer made by fuzzing test.

Part of tarantool/tarantool#9145

Run Details

5342 of 5974 branches covered (0.0%)

Branch coverage included in aggregate %.

3 of 3 new or added lines in 1 file covered. (100.0%)

9 existing lines in 6 files now uncovered.

20497 of 23295 relevant lines covered (87.99%)

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