The Following problem have happened to a brand new pixel. I have tried all possible ways to fix it but I suspect it not all pixel 9 devices but some that are having an issue. To test this I have got myself another new Pixel 9 and if Graphene OS worked fine in that, it concludes that some pixel 9 devices are facing the issue. I will post the detailed Log and crash reports soon in this thread.
Freemason054228 Jul
I recently installed GrapheneOS on a brand new Pixel 9 and have been experimenting with it using a setup of three profiles: one for Admin tasks, a main user profile, and a third for Google-related use to keep things compartmentalized. From day one, I began experiencing random crashes and reboots, even with only a single app running and no signs of overheating or resource strain. Initially, I assumed it might be an issue with a particular app or setup, but the reboots continued. I reflashed the OS to ensure it wasn’t a bad install, but the crashes still occurred on a clean system. After checking logs and kernel crash reports, I traced the issue to a kernel panic caused by a SysMMU READ PAGE FAULT involving the display controller (DPU). Specifically, the crash happens in the samsung_sysmmu_irq_thread() function when the DPU attempts to access an unmapped memory address, triggering a panic. The crash is tied to the Samsung IOMMU v9 driver, which handles memory for the display subsystem. There are also repeated errors during display initialization, like failed wait phy pll stable, suggesting that the IOMMU mappings might be incomplete or misconfigured. All signs point to this being a software or driver-level issue, not a hardware fault — especially since the problem is reproducible and occurs even after a clean OS install. This makes the device unstable and frustrating to use with GrapheneOS in its current state, and I may have to switch back to the stock OS until the issue is resolved. I’m sharing this here in case others have seen similar behavior or if the devs are already tracking it. Let me know if logs or more technical details would be helpful.