Could we over-allocate the data segment by
QEMU_DATA_SIZE/getrlimit(RLIMIT_DATA)/128 MB depending on what's set -
similar to how the stack size is managed?

My current workaround for aarch64 on x86-64 is to mmap a dynamic main
executable in some far-away part of the address space but I'm not sure
how to find somewhere suitable on a 32-bit host/guest.

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https://bugs.launchpad.net/bugs/1749393

Title:
  sbrk() not working under qemu-user with a PIE-compiled binary?

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