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Memory leak in .NET Garbage Collector with System.Transactions.SafeIUnknown


By : samuel
Date : October 16 2020, 11:12 AM
it helps some times SafeIUnknown is derived from SafeHandle. That's the class that implements the finalizer. It is special, its finalization code runs in a critical execution region (CER). Such kind of code provides an execution guarantee, exceptions are suppressed. The finalizer runs SafeIUnknown.ReleaseHandle(), it makes a call to Marshal.Release() to release the COM interface pointer that's wrapped by SafeIUnknown.
Seeing a lot of these wrappers in the finalization queue indicates that the Marshal.Release() call is throwing an exception. Preventing the wrapper from getting finalized. Finding out exactly why it is throwing an exception is going to be tricky. This is unmanaged code bombing, you'll have few hints available to find out why. The 95% case is heap corruption, a very difficult problem to troubleshoot. Most of all because this probably isn't your code and you don't have any source.
code :


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Question about the garbage collector in .NET (memory leak)


By : user1564382
Date : March 29 2020, 07:55 AM
this one helps. Yeah, the garbage collector is freeing your objects when they're not used anymore.
What we usually call a memory leak in .NET is more like:

Memory leak - absence of a garbage collector


By : user3545571
Date : March 29 2020, 07:55 AM
I hope this helps . That assumes that the kernel cleans up after you. Not all OSs take care of dynamically-allocated memory automatically. (But to be fair: Most modern ones, at least on the desktop, do.) Even the OSs that reclaim all memory only do so when the process terminates. Most programs allocate far more memory over their total runtime than they need at any given point in time (when run long enough, where "long" can be a few seconds for many data-crunching applications). Because of that, many - especially long-running - processes would create more and more garbage (memory that isn't used any more, and won't be used ever again) over their lifetime without any hope of getting rid of it without terminating. You don't want to kill and restart the whole process just to keep memory usage low, do you? Because unused memory is almost never (there are quite a few processes that run indefinitely and some that can run for hours) disposed of, you get serious memory shortage after a while. Your browser keeps all images, HTML documents, JS objects, etc. you opened during this session in memory because you won't bother to restart it every few minutes. That's bullshit and a serious problem in the browser, you say? My point exactly. Moreover, most (that is to say, all good ones) GCs don't deallocate everything - they run from time to time when they think it's worth it, but when the process shuts down, everything that remains in memory is left to a lower level (be it a custom allocator or the OS) to be freed. This is also why finalizers aren't guaranteed to run - in a short-running program that doesn't make many allocations, the GC may never run.
So no, GC isn't about saving time. It's about saving tons of memory, preventing long-running allocation-intense programs from hogging all available memory and eventually making everyone die from out of memory errors.

Memory leak?! Is Garbage Collector doing right when using 'create_function' within 'array_map'?


By : NASQWERTY
Date : March 29 2020, 07:55 AM
this will help In the case of create_function() a lambda-style function is created using eval(), and a string containing its name is returned. That name is then passed as argument to the array_map() function.
This differs from the closure-style anonymous function where no string containing a name is used at all. function($o) { return $o->id; } IS the function, or rather an instance of the Closure class.
code :
function create_function($arguments,$code) 
{
  $name = <_lambda_>; // just a unique string
  eval('function '.$name.'($arguments){$code}');
  return $name;
}
while (true)
{
    $func = create_function('$o', 'return $o->id;');
    $objects = array_map($func, $objects);
    echo memory_get_usage() ."\n";
    sleep(1);
}
$func = create_function('$o', 'return $o->id;');

while (true)
{
    $objects = array_map($func, $objects);
    echo memory_get_usage() ."\n";
    sleep(1);
}

Resolving memory leak from garbage collector


By : Ali Shafiee
Date : March 29 2020, 07:55 AM
it should still fix some issue i highly doubt that. memory leaks, unless by native code, is really a case of memory bloat. Memory bloat is just objects having strong references that are never nulled out.

Is it a memory leak if the garbage collector runs abnormally?


By : Pablo Cúbico
Date : March 29 2020, 07:55 AM
With these it helps To determine if it is a memory leak, you would need to observe it more.
From your description, i.e. that once the maximum memory is reached, the GC kicks in and is able to free memory for your application to run, it does not sound like there is a leak.
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