Commits on Aug 14, 2023

1. core: fix ASAN_START_SWITCH_FIBER() usage …

   The `__sanitizer_start_switch_fiber()` function takes a pointer as the
   first argument to store the current fake stack if there is one (it is
   necessary when stack-use-after-return detection is enabled). When leaving a
   fiber definitely, NULL must be passed so that the fake stack is destroyed.
   
   Before this patch, NULL was passed for dead fibers, however this is wrong
   for dead fibers that are recycled and resumed. In such cases ASAN destroys
   the fake stack, and the fiber crashes trying to use it in `fiber_yield()`
   upon return from `coro_transfer()`.
   
   Closes tarantool/tarantool-qa#321
   
   NO_DOC=bugfix
   NO_TEST=tested by test-release-asan workflow

   

   Gumix committed Aug 14, 2023
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