General extensions #2
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…n padics/padic_extension_generic.py
…math.org/sage into general-extensions
so that __init__ goes through the p-adic class stack
I think this should work, however, there is some problem with the generic ring extension code that I cannot make sense of
…n' into general-extensions
…o general-extensions
also remove the _default_category magic. The default_category feature does not seem to be used in many parts of SageMath. Also, it's not very flexible, as in this example. The default category here depends on whether we are a field or only a ring.
we could implement it now. But we probably don't want it as a global function like this anymore.
now all p-adic tests run in less than 10s for me.
apparently this code is not hit by our doctests
…o general-extensions
…o general-extensions
saraedum
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Mar 30, 2023
### 📚 Description Trac branch `u/gh-collares/gap-gc` from sagemath#34701, now migrated to GitHub. Currently based atop sagemath#35093; will rebase once that is merged. The rest of the description below is copied from sagemath#34701: A refactor in sagemath#27946 introduced "unprotected" (not surrounded by `GAP_Enter`/`GAP_Leave`) `GAP_ValueGlobalVariable` calls. I believe this might be a GC hazard, because after updating to GAP 4.12.1 I started seeing aarch64 crashes on NixOS infrastructure such as: ``` #0 0x0000fffff79740e8 in wait4 () #1 0x0000fffff5dc6b78 in print_enhanced_backtrace () #2 0x0000fffff5dc8190 in sigdie () #3 0x0000fffff5dcb1c0 in cysigs_signal_handler () #4 0x0000fffff7ffb7cc in __kernel_rt_sigreturn () #5 0x0000ffff99a0bf28 in ConvString () #6 0x0000000000000000 in ?? () sagemath#7 0x0000000000000000 in ?? () sagemath#8 0x0000000000000000 in ?? () sagemath#9 0x0000ffff99989930 in Pr () sagemath#10 0x0000ffff9998aa18 in CloseOutput () sagemath#11 0x0000ffff99884828 in capture_stdout () at /build/sage- src-9.7/pkgs/sagemath-standard/sage/libs/gap/element.pyx:154 ... ``` I also see cases where `capture_stdout` throws errors such as `sage.libs.gap.util.GAPError: Error, Length: <list> must be a list (not the integer 255)` and then crashes. Both types of errors are fixed by this ticket. Note that I am nesting `GAP_Enter`/`GAP_Leave` calls because I didn't remove the preexisting calls inside `capture_stdout`. That's because I feared removing the innermost calls might create a new footgun (and I believe nested `GAP_Enter`/`GAP_Leave` calls are explicitly supported), but removing them should cause no problem. Removing them might even be preferable for performance reasons, I don't know. Fixes sagemath#34701 ### 📝 Checklist <!-- Put an `x` in all the boxes that apply. --> <!-- If your change requires a documentation PR, please link it appropriately --> <!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! --> - [x] I have made sure that the title is self-explanatory and the description concisely explains the PR. - [x] I have linked an issue or discussion. - [ ] I have created tests covering the changes. - [ ] I have updated the documentation accordingly. ### ⌛ Dependencies <!-- List all open pull requests that this PR logically depends on --> <!-- - #xyz: short description why this is a dependency - #abc: ... --> - sagemath#35093: GAP 4.12.2 upgrade, which touches the same function and should land first. URL: sagemath#35114 Reported by: Mauricio Collares Reviewer(s): Dima Pasechnik
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This is a fake PR so we can see what changes are in #34993 on top of those in #34991 and #34992.