What Is Segv_Maperr

What is SEGV_MAPERR?

There are two common kinds of SEGV, which is an error that results from an invalid memory access:

  1. A page was accessed which had the wrong permissions. E.g., it was read-only but your code tried to write to it. This will be reported as SEGV_ACCERR.
  2. A page was accessed that is not even mapped into the address space of the application at all. This will often result from dereferencing a null pointer or a pointer that was corrupted with a small integer value. This is reported as SEGV_MAPERR.

Documentation of a sort (indexed Linux source code) for SEGV_MAPERR is here: http://lxr.free-electrons.com/ident?i=SEGV_MAPERR.

What is the meaning of 'code' in Segmentation Fault

Per siginfo.h:

SEGV_MAPERR means you tried to access an address that doesn't map to anything.

SEGV_ACCERR means you tried to access an address that you don't have permission to access.

So in both cases you accessed an address you shouldn't have, which is probably the only thing your actual code is guilty of. In the former case there's no memory in that address range anyway. In the latter case there is memory in that address range but you don't own it.

If you were to access a random address then which you get depends on how the OS happens to have your process set up at that moment.

What might cause this error in android?

Signal 11 (SIGSEGV) is the signal sent to a process when it makes an invalid memory reference, or segmentation fault. In Android, it's quite often caused by something like a WebView or plugin trying to use more memory than is available, but all sorts of things can potentially cause it -- especially when working with the NDK. Trying to free() memory that has already been released, for example, or just a dangling pointer. A few examples:

http://groups.google.com/group/android-ndk/browse_thread/thread/8d083a0ccebe0faa?pli=1

What is SEGV_MAPERR?

SIGNAL 11 SIGSEGV crash Android

Catch Flash out-of-memory error in WebView?

Unfortunately, the specific problem cannot be determined from the information available here.

Heap Corruption - SEGV_MAPERR in Android Native code

After all I was able to work around this problem, EVP_CipherUpdate (or jni ReleaseByteArrayElements) sometimes overflow the output buffer causing the heap corruption, nothing in my code was wrong and also it was not a problem with the caller as replacing EVP_CipherUpdate with a memcpy call with the same parameters worked as expected and there was no heap corruption.

So the solution was adding some extra length to the output buffer sent to nativeUpdate and the error was gone.

I have made the full working version of the library for others to use at:
https://github.com/frisco82/conceal

SIGSEGV 'SEGV_MAPERR' crash inside my app that is on apple store

Have you tried to run it in release mode (default is debug -> hold on your app name in top left xCode corner, select edit scheme, select run tab, change build configuration to release, don't forget to switch it back to debug later).

Seems like an issue with changing the default keyboard to the different one. Open the AppStore, download custom keyboard (eg. Swype, it's popular so there's high chance it's crashing on it) and try to change it while in your app.

SIGSEGV SEGV_MAPERR 0x00000000fbadbeef in libwebviewchromium.so

From the Chromium WebKit sources — see the comment just above the macro definition — , this is their code for "known, unrecoverable errors like out-of-memory".

signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x7f4485ff1820

So for me, the problem was parsing Google's Location object with Gson. I created my own SimpleLocation object and it solved the problem. Google's Location object was throwing random Signal 11 error and crashing randomly.

Here is a link to similar problem with better explanation https://github.com/e-mission/e-mission-data-collection/issues/49



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