[Bug 1914849] [NEW] mprotect fails after MacOS 11.2 on arm mac

[Toshifumi NISHINAGA]

Public bug reported:

I got the following error when I ran qemu on arm mac(MacOS 11.2).

```
$ ./qemu-system-x86_64
qemu-system-x86_64: qemu_mprotect__osdep: mprotect failed: Permission denied
**
ERROR:../tcg/tcg.c:844:tcg_region_init: assertion failed: (!rc)
Bail out! ERROR:../tcg/tcg.c:844:tcg_region_init: assertion failed: (!rc)
[1]    34898 abort      ./qemu-system-x86_64
```

I tested the same version of qemu on intel mac(MacOS 11.2), but it works
fine.

And my friend told me that they did not have this error with MacOS 11.1.

So, I think it is CPU architecture or an OS version dependent error.


Environment:

Qemu commit id: d0dddab40e472ba62b5f43f11cc7dba085dabe71
OS: MacOS 11.2(20D64)
Hardware: MacBook Air (M1, 2020)


How to build:

```
mkdir build/
cd build/
../configure --target-list=aarch64-softmmu,x86_64-softmmu
make
```


How to reproduce:

```
./qemu-system-x86_64
```


Error message:

```
$ ./qemu-system-x86_64
qemu-system-x86_64: qemu_mprotect__osdep: mprotect failed: Permission denied
**
ERROR:../tcg/tcg.c:844:tcg_region_init: assertion failed: (!rc)
Bail out! ERROR:../tcg/tcg.c:844:tcg_region_init: assertion failed: (!rc)
[1]    34898 abort      ./qemu-system-x86_64
```

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1914849

Title:
  mprotect fails after MacOS 11.2 on arm mac

Status in QEMU:
  New

Bug description:
  I got the following error when I ran qemu on arm mac(MacOS 11.2).

  ```
  $ ./qemu-system-x86_64
  qemu-system-x86_64: qemu_mprotect__osdep: mprotect failed: Permission denied
  **
  ERROR:../tcg/tcg.c:844:tcg_region_init: assertion failed: (!rc)
  Bail out! ERROR:../tcg/tcg.c:844:tcg_region_init: assertion failed: (!rc)
  [1]    34898 abort      ./qemu-system-x86_64
  ```

  I tested the same version of qemu on intel mac(MacOS 11.2), but it
  works fine.

  And my friend told me that they did not have this error with MacOS
  11.1.

  So, I think it is CPU architecture or an OS version dependent error.

  
  Environment:

  Qemu commit id: d0dddab40e472ba62b5f43f11cc7dba085dabe71
  OS: MacOS 11.2(20D64)
  Hardware: MacBook Air (M1, 2020)

  
  How to build:

  ```
  mkdir build/
  cd build/
  ../configure --target-list=aarch64-softmmu,x86_64-softmmu
  make
  ```

  
  How to reproduce:

  ```
  ./qemu-system-x86_64
  ```

  
  Error message:

  ```
  $ ./qemu-system-x86_64
  qemu-system-x86_64: qemu_mprotect__osdep: mprotect failed: Permission denied
  **
  ERROR:../tcg/tcg.c:844:tcg_region_init: assertion failed: (!rc)
  Bail out! ERROR:../tcg/tcg.c:844:tcg_region_init: assertion failed: (!rc)
  [1]    34898 abort      ./qemu-system-x86_64
  ```

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