btw., i dont think it's the early-bootup behavior of lockdep that causes
your oops. I think %gs somehow ended up being invalid upon pagefault
entry, well after bootup. Not sure why. Andi's patch just papers over
this i believe.
ah ... found it meanwhile: in the syscall exit path the PDA patches
restore the userspace %gs too early, trace_hardirqs_on() is called
_after_ the restoring of %gs. Will send a patch in a few minutes.
Ingo
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