Crash on iOS 15 when trying to start with Metal rendering enabled

[osy]

Try https://github.com/utmapp/UTM/actions/runs/21226248250/artifacts/5211120048

I sincerely apologize, but I seem to be encountering a new issue: when the renderer backend is set to Metal+MoltenVK with GPU acceleration enabled, the UTM application crashes while starting the virtual machine.

UTM-2026-01-22-131601.ips.txt

Originally posted by @tangxinyi9420-oss in #7587

[osy]

@tangxinyi9420-oss please try https://github.com/utmapp/UTM/actions/runs/21308731303/artifacts/5242177651

[Pic236]

@tangxinyi9420-oss please try https://github.com/utmapp/UTM/actions/runs/21308731303/artifacts/5242177651

Excellent!I have tested the latest build you provided, and the previously reported crash when using the Metal renderer backend with GPU acceleration enabled is now completely resolved. The virtual machine starts and runs normally now.

Thank you for the quick fix and your continued efforts!

[Pic236]

@tangxinyi9420-oss please try https://github.com/utmapp/UTM/actions/runs/21308731303/artifacts/5242177651

I'm terribly sorry, but it seems I've encountered another issue. When the renderer backend is set to Metal (with Vulkan enabled or disabled, the result is the same) and GPU acceleration is enabled (it runs normally if turned off), calling OpenGL ES causes UTM to crash.

UTM-2026-01-24-165050.txt

I also tested UTM 4.7.5, and enabling GPU acceleration with the OpenGL renderer backend still causes UTM to crash when invoking OpenGL ES.

UTM-2026-01-25-031545.txt

[osy]

@tangxinyi9420-oss 1. Can you provide debug.log as well?
2. What are you launching in the guest to cause the crash? Can you try installing mesa-utils-extra and running es2gears_wayland or es2gears_x11?
3. Can you test 4.7.4 as well?
4. ANGLE (OpenGL) works?

[Pic236]

@tangxinyi9420-oss 1. Can you provide debug.log as well? 2. What are you launching in the guest to cause the crash? Can you try installing mesa-utils-extra and running es2gears_wayland or es2gears_x11? 3. Can you test 4.7.4 as well? 4. ANGLE (OpenGL) works?

UTM 5.0.1(Build 120)

debug.log

Results of running es2gears_wayland and es2gears_x11 with the renderer backend set to Metal and Vulkan enabled, along with glxgears (which caused the virtual machine to crash):

1000008904.mp4

[Pic236]

@tangxinyi9420-oss 1. Can you provide debug.log as well? 2. What are you launching in the guest to cause the crash? Can you try installing mesa-utils-extra and running es2gears_wayland or es2gears_x11? 3. Can you test 4.7.4 as well? 4. ANGLE (OpenGL) works?

UTM 5.0.1(Build 120)

debug.log

Results of running es2gears_wayland and es2gears_x11 with the renderer backend set to Metal and Vulkan enabled, along with glxgears (which caused the virtual machine to crash):

1000008904.mp4

Results of running es2gears_wayland, es2gears_x11, and glxgears (virtual machine running properly) with the renderer backend set to OpenGL:

[osy]

@tangxinyi9420-oss 1. Can you provide debug.log as well? 2. What are you launching in the guest to cause the crash? Can you try installing mesa-utils-extra and running es2gears_wayland or es2gears_x11? 3. Can you test 4.7.4 as well? 4. ANGLE (OpenGL) works?

UTM 5.0.1(Build 120)

debug.log

Results of running es2gears_wayland and es2gears_x11 with the renderer backend set to Metal and Vulkan enabled, along with glxgears (which caused the virtual machine to crash):

1000008904.mp4

Are you sure debug.log is up to date? I see a successful shut down and not a crash

[Pic236]

@tangxinyi9420-oss 1. Can you provide debug.log as well? 2. What are you launching in the guest to cause the crash? Can you try installing mesa-utils-extra and running es2gears_wayland or es2gears_x11? 3. Can you test 4.7.4 as well? 4. ANGLE (OpenGL) works?

UTM 5.0.1(Build 120)
debug.log
Results of running es2gears_wayland and es2gears_x11 with the renderer backend set to Metal and Vulkan enabled, along with glxgears (which caused the virtual machine to crash):
1000008904.mp4

Are you sure debug.log is up to date? I see a successful shut down and not a crash

Apologies, this is the debug.log file I exported while reproducing the issue

debug.log

[Pic236]

@tangxinyi9420-oss 1. Can you provide debug.log as well? 2. What are you launching in the guest to cause the crash? Can you try installing mesa-utils-extra and running es2gears_wayland or es2gears_x11? 3. Can you test 4.7.4 as well? 4. ANGLE (OpenGL) works?

UTM 5.0.1(Build 120)
debug.log
Results of running es2gears_wayland and es2gears_x11 with the renderer backend set to Metal and Vulkan enabled, along with glxgears (which caused the virtual machine to crash):
1000008904.mp4

Are you sure debug.log is up to date? I see a successful shut down and not a crash

Apologies, this is the debug.log file I exported while reproducing the issue

debug.log

Sorry for the mess, I need some time to organize these issues and the error logs.

[osy]

@tangxinyi9420-oss 1. Can you provide debug.log as well? 2. What are you launching in the guest to cause the crash? Can you try installing mesa-utils-extra and running es2gears_wayland or es2gears_x11? 3. Can you test 4.7.4 as well? 4. ANGLE (OpenGL) works?

UTM 5.0.1(Build 120)
debug.log
Results of running es2gears_wayland and es2gears_x11 with the renderer backend set to Metal and Vulkan enabled, along with glxgears (which caused the virtual machine to crash):
1000008904.mp4

Are you sure debug.log is up to date? I see a successful shut down and not a crash

Apologies, this is the debug.log file I exported while reproducing the issue

debug.log

Your log ends with

qemuWillQuit2026-01-25 13:52:07.039 UTM[1718:190229] [QEMULogging(0x282204040)] qemuWillQuit
QMP disconnected
2026-01-25 13:52:07.041 UTM[1718:190220] [QEMULogging(0x282204040)] QMP disconnected
QEMU exited with code 0: (no message)2026-01-25 13:52:07.042 UTM[1718:189104] [QEMULogging(0x282204040)] QEMU exited with code 0: (no message)

So it looks like a shutdown and not a crash.