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very strange bug with LaurentSeriesRing #7

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sagetrac-dmharvey mannequin opened this issue Sep 12, 2006 · 3 comments
Closed

very strange bug with LaurentSeriesRing #7

sagetrac-dmharvey mannequin opened this issue Sep 12, 2006 · 3 comments
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c: basic arithmetic p: major / 3 t: bug

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@sagetrac-dmharvey
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sagetrac-dmharvey mannequin commented Sep 12, 2006 

sage: R.<u> = LaurentSeriesRing(pAdicField(5, 10))
sage: S.<t> = LaurentSeriesRing(RationalField())
sage: R(t + t^2 + O(t^3))
 u^1 + t + O(t^2) + u^2 + t + O(t^2) + O(u^3 + t + O(t^2))

???!!!!???

Component: basic arithmetic

Issue created by migration from https://trac.sagemath.org/ticket/7
@williamstein
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Attachment: 1790.patch.gz

@williamstein
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comment:1

Fixed for sage-1.5

@dimpase
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dimpase commented Sep 8, 2022

comment:2

a comment to facilitate GH import, please ignore.

@JohnCremona JohnCremona mentioned this issue Feb 2, 2010
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@jpflori jpflori mentioned this issue Jan 20, 2011
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vbraun pushed a commit that referenced this issue Mar 26, 2023
gh-35114: libgap: Remove some GC hazards
0d01c38 
    
### 📚 Description

Trac branch `u/gh-collares/gap-gc` from #34701, now migrated to GitHub.
Currently based atop #35093; will rebase once that is merged.

The rest of the description below is copied from #34701:

A refactor in #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 ?? ()
#7  0x0000000000000000 in ?? ()
#8  0x0000000000000000 in ?? ()
#9  0x0000ffff99989930 in Pr ()
#10 0x0000ffff9998aa18 in CloseOutput ()
#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 #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: ...
-->
- #35093: GAP 4.12.2 upgrade, which touches the same function and should
land first.
    
URL: #35114
Reported by: Mauricio Collares
Reviewer(s): Dima Pasechnik
vbraun pushed a commit that referenced this issue Jun 3, 2023
@soehms
Cleaning of warning comments (#7)
c829525 
* clean_warning_comments initial

* clean_warning_comments remove pull_request trigger from workflow
jsantillan3 pushed a commit to jsantillan3/sage that referenced this issue Jul 26, 2023
@xuluze
Add examples for is_k_modular, is_strongly_k_modular (sagemath#7)
02138e5
vbraun pushed a commit that referenced this issue Oct 8, 2023
@Aaron-Dwyer
Merge pull request #7 from Aaron-Dwyer/coveringarray
8dc17c6 
Coveringarray
xuluze added a commit to xuluze/sage that referenced this issue Dec 12, 2023
@xuluze @mkoeppe
Add examples for is_k_modular, is_strongly_k_modular (sagemath#7)
df14576
xuluze added a commit to xuluze/sage that referenced this issue Feb 23, 2024
@xuluze @mkoeppe
Add examples for is_k_modular, is_strongly_k_modular (sagemath#7)
6789b80
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