Windows 7 and 10 crash consistently: mprotect failed: Permission denied

[jonofmac]

Describe the issue
Hello, I'm running x86 windows 7 or windows 10 on M1. I'm having an issue where it seems that QEMU is crashing every time I try to launch this VCM Editor or VCM Scanner.

To replicate, I'd suggest the following:

1. Install windows 10 (Version doesn't matter, I have 10 pro). It does it in windows 7 just the same, but 10 has all the pre-reqs.
2. Download and install VCM Suite from hptuners dot com. It's tuning software for cars, but for some reason the emulator crashes 100% of the time with this software.
3. Launch VCM Editor or VCM Scanner. Doesn't matter. The emulator seems to crash and gives me a warning about a random unused parameter. I've tried changing the parameter but it doesn't help anything. Looking at the crash report seems to suggest it may be something there.

End of the log seems to be most telling:

Please use disable-ticketing=on instead
qemu-x86_64-softmmu: -accel tcg,thread=multi,tb-size=1024: warning: Guest expects a stronger memory ordering than the host provides
This may cause strange/hard to debug errors
qemu-x86_64-softmmu: -accel tcg,thread=multi,tb-size=1024: qemu_mprotect__osdep: mprotect failed: Permission denied

Configuration

• UTM Version: 2.1.1 (30)
• OS Version: 11.4 (Big Sur)
• Intel or Apple Silicon? Apple M1, 2020, 8 GB, Macbook Air

Crash log
QEMULauncher_2021-06-22-002120_Jonathans-MacBook-Air.crash.zip

Debug log
debug.log

[jonofmac]

Found a reference that suggested this might have been fixed in the Dev branch. I switched branches and attempted to compile, but was unsuccessful compiling. Shame, because I've been really trying to find a way to get x86 windows running with USB.

error: unknown type name 'mbstate_t'; did you mean '__mbstate_t'?
int     mbsinit(const mbstate_t *);

And got lots of:

In file included from 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.3.sdk/usr/include/c++/v1/cstddef:37:
../version:1:1: error: expected unqualified-id
6.0.0

[kwhr0]

From the crash log:

Exception Type:        EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes:       0x0000000000000001, 0x0000000013948294
Exception Note:        EXC_CORPSE_NOTIFY

This bug in QEMU 6.0.0 has been fixed in a patch I submitted.

qemu/qemu@26b1248f66

[martykan]

Unfortunately I got this on 2.1.2 (31) as well. M1 Macbook Air, macOS 11.5

qemu-x86_64-softmmu: -accel tcg,tb-size=256: qemu_mprotect__osdep: mprotect failed: Permission denied

[kwhr0]

My patch fixes a crash caused by SIGILL and is not about mprotect, which was modified in macOS 11.2.