On Mon, 20 Jan 2020, Patrick Welche wrote:
On Mon, Jan 20, 2020 at 12:51:00PM +0000, Andrew Doran wrote:
This also happened the last time I touched rw_downgrade(), and I backed out
the change then, but both times I don't see the bug. I have some questions:
- Are you running DIAGNOSTIC and/or LOCKDEBUG? I would be very interested
to see what happens with a LOCKDEBUG kernel here.
Hmmm, at least on x86, in the LOCKDEBUG case we don't use the assembler
stubs; we simply use the C versions.
On IRC/ICB, mlelstv has indicated there's something wrong in the stubs,
but I don't see it.
One worked with the addition of LOCKDEBUG. The other didn't, but it seems
to be unrelated:
Yeah, that backtrace looks unrelated.
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