Re: [Qemu-devel] ARM brk bug

[Peter Maydell]

On 27 February 2012 15:16, Bernhard M. Wiedemann <address@hidden> wrote:
> I found that running a debian arm5 bash with qemu runs into varying
> problems with -R but works without. Also works fine on both armv5 and
> armv7hf hardware.
>
>
> This happened with both master and 1.0 builds:
>
> curl www.zq1.de/~bernhard/temp/debian-bash-bug-nss-minimal.tar.gz |\
>  tar xz
> cd debian-bash-bug-nss-minimal
> path/to/qemu/arm-linux-user/qemu-arm -R 500M -L . bin/bash
> qemu: uncaught target signal 11 (Segmentation fault) - core dumped
> Segmentation fault

> but otherwise it failed with messages like
> bash: xmalloc: ../bash/variables.c:1971: cannot allocate 2 bytes (8192
> bytes allocated)

So, er, don't do that then? This looks suspiciously like we're
failing an mmap() (because of the limited guest address space you've
asked for with -R) and then bash is either failing to handle it
and crashing or printing a message about the allocation failure.

-- PMM