My 11th generation laptop (debian linux) sometimes freezes and reboots. Sometimes when this happens, it enters a state where it cannot run: after every boot, it reboots within seconds or minutes (sometimes after login, sometimes at the disk password entry screen, sometimes at the GRUB menu.
Red noise covers the screen when the system freezes (sometimes but not always; visual symptoms vary):
Just once I caught the following error message on the console:
[8.061723] DMAR DRHD: handling fault status reg 3 [8.061807] DMAR DMA Read NO_PASID Request device [00.0d.2] fault addr 0xffffe000 [fault reason 0x0b] non-zero reserved fields in CTP
What can I do to debug this?