SIGSEGV only while debug

[MoonKid]

I got a program that runs (F9) normal without any errors.
But If I start it with a a debug (F8) it recieves a SIGSEGV.

<err>
Program received signal SIGSEGV, Segmentation fault.
In RpcRaiseException () (C:\WINDOWS\system32\rpcrt4.dll)
</err>

I do not know what it is. Any idea?

I am using the nightlys with gcc under WinXPSP2.

[thomas]

This is a "feature".

Windows sends signals, exceptions, and whatever during normal operation, for example during drag-and-drop, file selection dialogs, RPC, and some other actions. The debugger catches them, and shows them (not knowing that they are "normal").

[MoonKid]

Ok, but a Segmentation fault is something wrong, isn't it?

[thomas]

Possibly, but not necessarily. Try dragging a file over Code::Blocks when it runs in the debugger, it will segfault, too.

Most of the time (99%), if it crashes in "normal" mode but runs fine in the debugger, you forgot to zero-initialise a variable. The debugger initialises all variables, thus the bug is hidden.

Most of the time (99%), if it runs fine in "normal" mode but crashes only in the debugger, it's plain normal.

[MoonKid]

Possibly, but not necessarily. Try dragging a file over Code::Blocks when it runs in the debugger, it will segfault, too.

My application just crashes on startup before I see any window/dialog!

I checked some older versions in my svn. There is the same behavior.
I checke some older versions of code::blocks (from 1.february). There is the same behavior.
I am driving crazy!

Most of the time (99%), if it runs fine in "normal" mode but crashes only in the debugger, it's plain normal.

It is normal, ok! But I need to debug my application?
How can I do this?

[MoonKid]

Hm... I just restarted my WinXP. That's all.
I do not shutdown my system. I did a supend-to-disk for two weeks.

[byo]

If debugger gets some possible SEGFAULT which is normal due to situations Thomas described, after recieving such signal you should simply select continue and it will work. If it's really a bug, it will rethrow SEGFAULT.

BYO

[cyplo]

same problem with 5th May 2007 build on windows XP ; gdb 6.5 with cygwin environ
there is infinite number of sigsevs after clicking continue
all refer to ntdll.dll