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What Is A Segv In Linux
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This does not seem to be a problem with our extension. I guess it would crash if you ran the app from the command line, right? It appears to be a problem with the compiler, libraries, or runtime.
@sean-mcmanus The odd thing is that it seems to work fine from the terminal based on this comment:
This was originally created as microsoft/vscode-dev-containers#827 where it happened in a development container that was meant to provide a consistent toolchain. I can’t reproduce it.
I think there is a problem with the interface between VS Code and the GDB specific to this project (folders in VS Code).
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It’s not valid to be bound to the container because I’ve stripped the container down to the bare essentials and it’s still happening.
It’s interesting that when I select the Debug option I can see some launch options from the old configuration, while the launch.json only has a “Build Main” configuration copied from vscode-remote-try-cpp.
The same problem occurred again when I was just going through the program using the VS Code debugger.
@tomatac Do you have expressions in the watch window that when evaluated can cause the program to crash?
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I’m not sure I had anything in the guard window. If it was a variable, it was something simple (not an expression).
It seems that the solution when crashes occur is to clear all VS Code settings to restore them and be able to debug again.
I could try clearing just parts of the settings and see which setting causes the debugger to crash.
Normally launch.json is saved with the project and would not affect this particular issue.
Segv On Unknown Address In Colladasaxfwl::meshprimitiveinputlist::appendinputelement At Colladafwarrayprimitivetype.h:228 · Issue #643 · Khronosgroup/opencollada · Github
Yes, I don’t know about debug extension data cached by our extension at ~/.config/Code. So I’m guessing that VS Code itself might have stored something there that caused the problem?
The only optimizations I’m aware of are the GDB init file or the optimizations to start the debugger in launch.json
@tomatac Do you have expressions in the watch window that when evaluated can cause the program to crash? @WardenGnaw Do you think this could be a C/C++ debugging bug?
I faced the same problem. There is a variable in the watch window. The problem goes away after I delete the variable from the watch window.
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@tomatac Do you have expressions in the watch window that when evaluated can cause the program to crash? @WardenGnaw Do you think this could be a C/C++ debugging bug? I faced the same problem. There is a variable in the watch window. The problem goes away after I delete the variable from the watch window. Thanks.
I can confirm that I had a variable in the watch window that I didn’t add there and deleting it fixed the problem.
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Dnf: Segmentation Fault Preventing Upgrade To Fedora 37
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In backtrack means the driver has no debug symbols and you don’t know how to debug it further.
Thanks for the reports. Unfortunately, AMD’s implementation does not currently support sparse textures on Linux. The examples are pretty simple and don’t do any actual error checking, so they may crash if you use unsupported extensions.
These also crash for me under Windows 8.1 x64 with: AMD Radeon HD7670M with Catalyst 14.12 (OpenGL 4.4); Intel HD 4400 with driver 10.18.14.4206 (OpenGL 4.3).
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, for example, doesn’t run, but doesn’t crash on Intel either – the window doesn’t display anything and the program prints errors to stdout.
If all programs run fine on HD 7670M with Catalyst 15.7, Graham’s job is done 🙂 He can’t influence the quality of Nvidia or Intel drivers. Also, be sure to check the list of supported extensions for your card.
I’m not complaining about programs crashing or running on hardware that doesn’t support OpenGL 4.5. I just reported a crash on the HD 7670M which is OpenGL 4.4 compatible and running Catalyst 14.12.
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Debugging Ruby Performance
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I want to debug my program using gdb on v86. But after I just loaded my program into gdb and started it, I got “Program has received signal SIGSEGV, segmentation error”.
And I tried changing the breakpoint, the program was able to stop and resume at the first breakpoints, but I still get “The program received signal SIGSEGV, segmentation fault” when I continue later.
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The program I uploaded can run correctly without GDB. Is there a feature or bug not implemented in the VM? Or did you miss an option when creating an image?
I’m working on debugging v86 in my browser to find it, but it doesn’t seem easy. Feel free to contribute if the cause is due to something that was not implemented or was wrong.
The first statement in _start is a call to _dl_start, so I switch between breakpoints on the first two statements of _dl_start.
And there is a breakpoint at (_dl_start + 1). It is expected to stop at breakpoint 3 (_dl_start + 1) when I resume.
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If you want a breakpoint at the entry point, see: How to stop debugging immediately after execution?
How does GDB implement breakpoints? v86 ignores the trap signal so execution continues normally, but I’m not sure if that’s the problem here. The single byte capture instruction (INT3) is implemented in v86. Debug logs are not implemented.
I guess GDB uses debug registers. Can you check if this is the case? If this is the case, we might be able to get it to use a different mechanism by clearing certain bits of the CPU ID or causing errors when opening these registers. By the way, I’ve implemented read/write support for these registers because Haiku uses them as additional data registers.
@copy Is there a build environment and options for this image? If not, can you provide one? I want to build and test GDB with the same environment and options as yours. This can make it easier to find the cause of SIGSEGV in GDB.
Bug Report] Pamac 10 (latest Master) Segmentation Fault
@hackeris It’s a relatively old build root image. I no longer have the config file for it. I’m pretty sure Buildroot still supports the old kernels, so you can customize the browser VM image to suit your needs. I don’t think this particular gentleman makes any difference.
How does GDB implement breakpoints? v86 ignores the trap signal so execution continues normally, but I’m not sure if that’s the problem here. The single byte capture instruction (INT3) is implemented in v86. Debug logs are not implemented. I guess GDB uses debug registers. Can you check if this is the case? If this is the case, we might be able to get it to use a different mechanism by clearing certain bits of the CPU ID or causing errors when opening these registers. By the way, I’ve implemented read/write support for these registers because Haiku uses them as additional data registers.
There is another simulator (jslinux) which explains that single steps are not supported. And I didn’t see any SIGSEGV while stopping or resuming the program with gdb. Maybe the problem in version 86 is not with trap flags but with the debug registers?
With Valgrind and GDB in VM like this. Everything seems to work fine, including breakpoints, continuation and single-stepping. Valgrind simulates every statement in the target program. So it’s an implementation feature or a bug on the CPU in version 86.
On Linux, Attaching Debugger To A Running Process Causes The Process To Segfault · Issue #882 · Microsoft/debugpy · Github
And when I debug my program written in assembler and compiled with Yasm, it’s strange that it throws SIGSEGV on command
The problem with SIGSEGV in GDB was reported as a bug a few days ago. Any details on this error? Or a strange case?
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