[Solved]solving random crashes on reactivate application window

[hhacker]

I'm getting random crashes on my Qt application,here is the thing:my program has several thread which works fine on background,and it runs a couple of hour for good,and then it crashed when I switch back to program window."Access Violation" on Normal mode,"Segment fault" on Debug mode.
And this "Segment fault" is the only message I got,there is no other debug output at all,and I checked call stack but got nothing,after recur this bug several times,I found a qBadAlloc() into it.
I thought it was a memory leak or something else,but after checking memory usage,the usage didn't grow big at all.
I can not use Valgrind to check my code,because my environment limit me to use mingw on Windows 7.
So I was kind of stuck here,this bug is really fatal,any suggestions will be grateful.

EDIT:
The program is not immediately crash on reactive app window,but switch from different window will boost the crash happen,otherwise it will working normally for a long time.
EDIT:
After a lot of windows switch,finally I got some message useful on debug output window.
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HEAP[Server.exe]:
Invalid address specified to RtlFreeHeap( 003F0000, 25259B88 )
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EDIT:
My interface was based on qml.

[andreyc]

Without seeing source code and or a core dump it is hard to say where is a problem. Looks like you trying to use un-allocated memory somewhere.
I would suggest to run the app under debugger or add some debug printing at the places that are activated on window switch.

[hhacker]

[quote author="andreyc" date="1417020716"]Without seeing source code and or a core dump it is hard to say where is a problem. Looks like you trying to use un-allocated memory somewhere.
I would suggest to run the app under debugger or add some debug printing at the places that are activated on window switch.[/quote]

Thanks for your tips,my thread routine is a running cycle,and I didn't new any object for work.
I didn't un-allocated memory manually.

[hhacker]

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Some backtrace
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[hhacker]

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Some backtrace
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[hhacker]

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Some backtrace
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[hhacker]

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Some backtrace
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[hhacker]

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Some backtrace
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[hhacker]

After a deep core dump,I found out what happened,I was using QTime::currentTime() within Thread,QTime are not documented as being concurrent,so it causes this werid bug.fixed.