[Bug 221319] Certain operations via PCIe tunneling between an AMD USB4 host and a Thunderbolt-5 peripherals cause an instant reboot

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221319

--- Comment #6 from Mario Limonciello (AMD) (mario.limonciello@amd.com) ---
Here's the message that I was looking for:

> [    1.657766] x86/amd: Previous system reset reason [0x08000800]: an
> uncorrected error caused a data fabric sync flood event

I suspect that there are some PCIe errors occurring either internal to the SoC
or (more likely) between the SoC and your new device.  These are causing a
flood of problems, and then the BIOS eventually triggers an internal watchdog
that reboots the system.

Try adding this to your kernel command line and we'll see if there is anything
new from the PCI core about the issue:

> pcie_ports=native pcie_ecrc=on

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