Hi Rodrigo,

It looks like you might be hitting an issue that we are currently tracking 
internally inside Apple.

We have a hypothesis on the cause problem but we currently don't have a 
reproducer. Can you share a reproducer with us? Having a reproducer would allow 
us to confirm our hypothesis and come up with a fix.

Until a fix is landed your only options to workaround this are one of the 
following:

* Test your app in the iOS simulator
* Load fewer shared libraries at process start up time
* Use an iOS device with a large amount of RAM

Thanks,
Dan.

> On 1 Oct 2020, at 07:16, Rodrigo Mantini <rodrigo.mant...@king.com> wrote:
> 
> Hello, I'm trying to use ASAN on an IOS app but I get the mentioned error.
> I would like to know if there is anything at all that I can do to make it 
> work.
> I know that app links to a lot of shared libraries and I think that might be 
> issue, but if that is the case I don't know how can I debug it to see if 
> there is specific library that is using the memory space required by ASAN.
> 
> Here is the output with verbosity=3:
> ==43926==AddressSanitizer: libc interceptors initialized
> 
> ==43926==FindDynamicShadowStart, space_size = 0x00005b003fff
> 
> ==43926==Shadow doesn't fit, largest_gap_found = 0x000057fe0000, 
> max_occupied_addr = 0x000280000000
> 
> ==43926==FindDynamicShadowStart, space_size = 0x000057fe3fff
> 
> ==43926==Unable to find a memory range after restricting VM.
> 
> ==43926==AddressSanitizer CHECK failed: 
> /AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/clang_compiler_rt/clang-1200.0.32.2/compiler-rt/lib/asan/asan_mac.cpp:92
>  "((0 && "cannot place shadow after restricting vm")) != (0)" (0x0, 0x0)
> 
> Thank you,
> Rodrigo
> 
> 
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