|
Some of my code is causing heap corruption.
I don't know what code, but I suspect it's my SVG code. The issue is that it works sometimes. But if I look at it funny it starts crashing, and my stack trace keeps pointing me to different places depending on the seemingly unrelated changes I make in main(). Sometimes it points me to some font rendering code. Sometimes it points me to a seemingly innocuous assign to a local variable in my SVG parser code. It's maddening.
It doesn't reproduce on the PC, at least 64-bit. I haven't tried 32 because trying to get 32-bit executables built on a windows machine these days I think requires a VM?
I tried running Deleaker against it, not sure if it would pick up heap corruption - it either doesn't, or it isn't coming up on the PC.
Unfortunately, much of this code is derived in many places from work that wasn't mine to begin with, and so instrumenting it to detect heap corruption if I have to wrap all malloc/reallocs etc will cause me real pain.
I don't know what to do. Maybe this would rear its head if I had kilobytes instead of gigabytes of RAM? but i wouldn't even know how to set that up on a PC without altering my code to use a custom constrained heap.
I'm so frustrated I've put it down, but it's gnawing at me, because it's definitely blocking any attempt I make at releasing.
I wish these little IoT devices had good memory protection. It just now occurred to me to try this on an ARM and hope i can reproduce it. Maybe I'll get a better stack trace. Who knows? 
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
|
|
|
|
|
Can you compile on Linux? There at least you have ulimit so you could restrict your stack size. A quick google leads to Windows Resource Manager, which may or may not be available.
"A little song, a little dance, a little seltzer down your pants"
Chuckles the clown
|
|
|
|
|
Yeah it compiles everywhere I've tried. 
Hmmm, I have WSL. I hadn't heard of ulimit. Thanks
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
|
|
|
|
|
Also check out valgrind. It might give you some clues as to where to look.
"A little song, a little dance, a little seltzer down your pants"
Chuckles the clown
|
|
|
|
|
Doesn't valgrind require instrumentation? I'm trying to avoid that, in favor of something that hooks the system calls.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
|
|
|
|
|
Yeah, it probably does. But as a starting point, you could run under valgrind, with lots of stack, to see if it detects anything it thinks is not kosher (which might be everything you're doing from it's point of view  )
GNU libc allows you to hook various system calls : Hooks for Malloc (The GNU C Library) Maybe that can help? or the Previous link on that page re heap consistency checking?
"A little song, a little dance, a little seltzer down your pants"
Chuckles the clown
|
|
|
|
|
It looks like valgrind has a utility that hooks for you.
However, it also looks like valgrind requires linux to build, so I'm doing it but it's more work than I originally hoped.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
|
|
|
|
|
valgrind should be an installable package.
"A little song, a little dance, a little seltzer down your pants"
Chuckles the clown
|
|
|
|
|
maybe it was. I built it from the sources.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
|
|
|
|
|
honey the codewitch wrote: I haven't tried 32 because trying to get 32-bit executables built on a windows machine these days I think requires a VM?
Not if you're using older versions of Visual Studio. We have a couple products still maintained using Visual Studio 2008 that build for 32 bit.
Software Zen: delete this;
|
|
|
|
|
We build a part of our application called "DriverHost" as 32-bits in VS2022 and .NET 8.
|
|
|
|
|
That won't work.
Whatever the MSVC was able to compile back then, it wasn't C++. It was "C++-ish"
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
|
|
|
|
|
It served our purposes at the time; after all it made Mr. Object (one of my coworkers) happy  .
The fact that we're still using VS2008 to maintain these products is a reflection on how engineering management here is hardware-centric and it makes them lose their sphincter control when we mention changing tools.
Software Zen: delete this;
|
|
|
|
|
I'm sure wored/works for you.
My code won't compile with anything less than GCC within the last 7 years or so, or VS2022.
It took microsoft that long to get their crap together.
Is it really that hard to make stdint.h?
And fix their template syntax madness?
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
|
|
|
|
|
We build 32 bit executables and dlls in VS2022 from C++ source. We still have to support 32 bit applications.
|
|
|
|
|
Yeah, for some reason when I was looking through installed targeting packs I didn't see x86 for some reason. It's there. I just missed it the first time.
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
|
|
|
|
|
You can enable Address Sanitizer on Visual Studio to find memory issues such as corruptions or overruns.
|
|
|
|
|
honey the codewitch wrote: It doesn't reproduce on the PC, at least 64-bit. I haven't tried 32 because trying to get 32-bit executables built on a windows machine these days I think requires a VM?
VS 2022 allows building for ARM, ARM64, x86, and x64. I don't remember if all compilers are installed by default, but they definitely may be installed from the installer.
Your confusion may arise because VS 2022, unlike the earlier editions, is a 64-bit application.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
|
|
|
|
|
so after months of only getting the daily insider on occasion(once every other week or so). for the past week I have gotten it daily. I do enjoy it alot. interestingly. Not today though?
To err is human to really elephant it up you need a computer
|
|
|
|
|
It's a holiday weekend in the US. Is Kent in the US?
|
|
|
|
|
The holiday is on Monday though.
I’ve given up trying to be calm. However, I am open to feeling slightly less agitated.
I’m begging you for the benefit of everyone, don’t be STUPID.
|
|
|
|
|
Agreed, but from the looks of my office it appears it started today.
|
|
|
|
|
This should be an amusing thread. How have computers changed during your life?
---
In 1985, I purchased a $35 USD accelerator for my Zenith Z-100, which bumped the processor speed from 4.67 MHz to 7.5 MHz. It was an amazing change to the PC!!! [I originally put "Hz", which was pointed out as incorrect.]
That same year it cost $150 to bump that PC from 384 KB RAM up to 1 MB. After I got the PC back, only 1 software package (I think it was Turbo Pascal) could use more than 640 KB.
In 1989 I installed a 40 MB HD in our office server, quadrupling the storage space. We were excited, as the price had just dropped to $750 USD. Previously that same HD had cost nearly $1,500.
In 1999 I installed a new HD (can't remember the size offhand), and I did the math. Going by the per-MB cost, at 1989 prices the new HD would have cost $750,000. And at 1999 prices, the 40 MB HD would have cost about $0.02.
In 2009 I did the same thing -- at 1989 prices, the 2009 HD would have cost $45,000,000 ... and Excel didn't have enough precision to calculate the 2009 price of a 40 MB HD ...
modified 30-Aug-24 13:12pm.
|
|
|
|
|
We gotta have somewhere to put all the cat videos.
I’ve given up trying to be calm. However, I am open to feeling slightly less agitated.
I’m begging you for the benefit of everyone, don’t be STUPID.
|
|
|
|
|
First computer experience 1965. Had to wind it up every night.
>64
It’s weird being the same age as old people. Live every day like it is your last; one day, it will be.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
