Properly modify Caml_state->backtrace_last_exn#12861
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Octachron merged 1 commit intoocaml:trunkfrom Feb 1, 2024
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kayceesrk
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Dec 23, 2023
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LGTM.
The roots management for systhreads went through several iterations. It looks like this particular bug was introduced in ocaml-multicore/ocaml-multicore#771. In bringing the roots management closer to trunk, the modification of the generational global root Caml_state->backtrace_last_exn in restore_runtime_state was incorrectly changed to a plain store.
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@mshinwell this needs a Changes entry. Please put in in the 5.2 section as we want to include this trivial fix in the release branch. |
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@mshinwell , would you prefer if I took care of the changelog ? |
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Properly modify Caml_state->backtrace_last_exn (cherry picked from commit 5f0cdb7)
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I took the liberty to add the Changes entry, merge the PR, and cherry-pick it to 5.2. |
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Caml_state->backtrace_last_exncannot be updated using direct assignment, as it is registered as a generational global root. Direct assignment can (and does) lead to crashes.(Will add Changes entry later.)