[Bug 206501] Kernel 5.6-rc1 fails to boot on a PowerMac G4 3,6 with CONFIG_VMAP_STACK=y: Oops! Machine check, sig: 7 [#1]

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206501

--- Comment #6 from Christophe Leroy (christophe.leroy at c-s.fr) ---
I found the reason I think. I just realised that the things saved to SPRN_SPRG
and in thread struct get overwriten by the DSI taken at stack write.

I'll prepare something to fix that.

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