On Wed, Jul 15, 2020 at 09:02:05AM +0100, Alex Bennée wrote: > > David Gibson <[email protected]> writes: > > > On Tue, Jul 14, 2020 at 06:55:16PM +0100, Alex Bennée wrote: > >> We actually see failures on threadcount running without plugins: > >> > >> retry.py -n 1000 -c -- \ > >> ./ppc64abi32-linux-user/qemu-ppc64abi32 \ > >> ./tests/tcg/ppc64abi32-linux-user/threadcount > >> > >> which reports: > >> > >> 0: 978 times (97.80%), avg time 0.270 (0.01 varience/0.08 deviation) > >> -6: 21 times (2.10%), avg time 0.336 (0.01 varience/0.12 deviation) > >> -11: 1 times (0.10%), avg time 0.502 (0.00 varience/0.00 deviation) > >> Ran command 1000 times, 978 passes > >> > >> But when running with plugins we hit the failure a lot more often: > >> > >> 0: 91 times (91.00%), avg time 0.302 (0.04 varience/0.19 deviation) > >> -11: 9 times (9.00%), avg time 0.558 (0.01 varience/0.11 deviation) > >> Ran command 100 times, 91 passes > >> > >> The crash occurs in guest code which is the same in both pass and fail > >> cases. However we see various messages reported on the console about > >> corrupted memory lists which seems to imply the guest memory allocation > >> is corrupted. This lines up with the seg fault being in the guest > >> __libc_free function. So we think this is a guest bug which is > >> exacerbated by various modes of translation. If anyone has access to > >> real hardware to soak test the test case we could prove this properly. > >> > >> Signed-off-by: Alex Bennée <[email protected]> > >> Cc: David Gibson <[email protected]> > >> Cc: Philippe Mathieu-Daudé <[email protected]> > > > > Acked-by: David Gibson <[email protected]> > > > > Honestly, AFAICT the ppc64abi32-linux-user target is pretty much > > entirely broken anyway. Many things about it appear to make no > > sense, it's difficult to work out what it's even supposed to be, and I > > strongly suspect no-one's actually used it in like a decade. > > Should we think about marking it deprecated for 5.2?
Yes, probably. I just haven't gotten around to it.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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