Segmentation fault in ld.lib.so when using gzread

[Christian Helmuth]

Hey,

You put that quite large buffer on stack. Does the page fault occur in the stack area 0x40000000..0x50000000? Our stacks have a limited size and do not grow automatically.

Greets
Christian

On October 30, 2014 8:01:05 PM CET, Johannes Schlatow <schlatow at ...238...> wrote:
>Hey everyone,
>
>I'm using some 3rd party code that depends on zlib. In particular, it
>uses gzread() in order to read a file. Unfortunately, the
>corresponding piece of code causes a segfault in ld.lib.so.
>
>I narrowed this down to the following minimum example:
>
>  gzFile gzfile_components = gzopen("test.txt", "rb");
>  unsigned char buffer[1024*1024];
>  gzread(gzfile_components, buffer, sizeof(buffer));
>
>As you can see, the buffer is quite large but this the actual (and
>reasonable) value used in the 3rd party code.
>As soon as I reduce the size to e.g. 4096, the segfault is gone. 
>
>The file I used has a size of 293 bytes. I'm using base-linux.
>I also remember using this code successfully on a different computer
>with an older version of Genode (14.03).
>
>Any ideas/comments on this?
>
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-- 
Christian Helmuth
Genode Labs

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