On Sat, May 18, 2024, at 2:30 AM, Niranjana K M wrote:
> Dear LyX developers,
> Thank you and congratulations for heading towards much awaited LyX-2.4.
> I have been using LyX-2.4-RC1 from last 6 months and yesterday accidentally i
> caught this strange behavior. And I even installed recently released LyX-2.4
> and the behavior persisted in this version also. But i am not facing this
> problem in LyX-2.3.7.
> The problem is, when I try to copy, by selecting and pressing Ctrl+C (or
> Copy from edit menu), a math block which is boxed and also having deep nested
> subscripts to at least 4 levels then my computer memory rapidly got consumed
> to the full (starting from 1GB to ~10GB) and in the end LyX closed with
> following message.
>
> $ /usr/local/bin/lyx
> Error: Software exception Detected
> ----------------------------------------
> LyX has caught an exception, it will now attempt to save all unsaved
> documents and exit.
> Exception: std::bad_alloc
> Aborted
>
> Following is the math block which caused it, (LyX code)
> \begin_inset Formula
> \[
> \boxed{v=\left[v_{p}\right]_{a_{0}}}
> \]
> \end_inset
>
> The file is also attached in the end and here is the screenshot of the math
> block.
> Screenshot from 2024-05-18 11-43-00.png
>
> It is a legitimate construction and it gives no problem in LyX-2.3.7
> (confirmed).
> If either the box is removed or the subscript 0 is removed from *a*, then it
> has no issues in copying.
>
> All these versions I mentioned were compiled from source on Gentoo Linux.
> This LyX-2.4 was compiled with the following configuration,
> $ ./configure --without-included-boost
> Configuration
> Host type: x86_64-pc-linux-gnu
> Special build flags: build=release callback-printing use-hunspell
> use-aspell use-enchant
> Bundled libraries: nod
> C++ Compiler: g++ (13.2.1)
> C++ Compiler flags: -fPIC -O2 -std=c++17
> C++ Compiler user flags: -std=c++17 -march=native -O2 -pipe
> Linker flags: -rdynamic
> Linker user flags:
> Qt Frontend:
> Qt version: 5.15.11
> Packaging: posix
> LyX binary dir: /usr/local/bin
> LyX files dir: /usr/local/share/lyx
>
> I loved the new features in LyX-2.4 and don't want to go back to LyX-2.3.7
> due to this issue. Please help in this regard.
I can reproduce this. I investigated a little and it seems that the problem is
that the "while (true)" loop in the splitAndWrapInMText function in
InsetMathBox.cpp is never terminating. I believe that the reason for this is
that the logic in this function is not correctly identifying the matching XHTML
end tag for a given start tag, since it doesn't take into account nested tags
properly.
>
> *Regards*
> *Niranjana*
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>
>
> *Attachments:*
> • test.24.lyx
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