Hello
I have a situation, my program has a crash (SIGSEGV) for a reason that I don't know yet. I tried to analyze it using Valgrind but when I invoke the program with Valgrind, the crash no longer occurs.
Another observation is the crash only happens on SMP linux kernel. When I run the program on thhe non-SMP kernel it doesn't crash.
So does anyone know what exactly does Valgrind do that may have prevented the occurence of the crash??
Any help is appreciated.
4  3631  Motoma 3,237
Recognized Expert Specialist
Hello
I have a situation, my program has a crash (SIGSEGV) for a reason that I don't know yet. I tried to analyze it using Valgrind but when I invoke the program with Valgrind, the crash no longer occurs.
Another observation is the crash only happens on SMP linux kernel. When I run the program on thhe non-SMP kernel it doesn't crash.
So does anyone know what exactly does Valgrind do that may have prevented the occurence of the crash??
Any help is appreciated.
What language are you writing your program in?
It sounds like you are running into problems with the SMP kernel, and Valgrind may be subverting your attempts to debug because it is Valgrind running, and stepping through your program, and your program isn't actually running (think virtualization) .
My program is in C++ and Assembly. What happens is:
1) When I run on SMP, I get a crash. If I use Valgrind, the crash is no longer there.
2) When I run on non-SMP, I don't get a crash. Regardless of the use of Valgrind.
Motoma 3,237
Recognized Expert Specialist
My program is in C++ and Assembly. What happens is:
1) When I run on SMP, I get a crash. If I use Valgrind, the crash is no longer there.
2) When I run on non-SMP, I don't get a crash. Regardless of the use of Valgrind.
Your assembly may be causing the issue. Do you understand what I was saying about Valgrind emulating a single processor machine?
Hi I am not the original poster but am experiencing exactly the same issue. very frustrating.
I understand what you say and it would appear this seems to be a threading issue as my program uses multiple threads (1 per connection).
As far as I am aware all critical pieces of code are protected with re-entrant mutexes but perhaps I have missed something.
I am new to Linux programming and need to resolve this issue. Any hints you can give as to how I can go about tracing this problem would be appreciated.
As it is I have left the program running under Valgrind as it is considerably more stable :(
Oh also when the program is not under Valgrind and it crashes it does not produce a core dump so I cannot use that.
Thanks in advance
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