On 5/18/24 10:15, Alexander Dunlap wrote:
On Sat, May 18, 2024, at 9:52 AM, Alexander Dunlap wrote:
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.
Here is a patch that fixes the problem for me. It needs extensive
checking/testing though because I do not know too much about XHTML or
what all sorts of input might be seen in this function.
Thanks! This looks good to me, but Thibaut should also have a look.
I have to rebuild 2.4.0 anyway, due to some build issues on Windows, so
this could be included.
Riki
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