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That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" David Gibson writes: > On Tue, Jul 14, 2020 at 06:55:16PM +0100, Alex Benn=C3=A9e wrote: >> We actually see failures on threadcount running without plugins: >>=20 >> retry.py -n 1000 -c -- \ >> ./ppc64abi32-linux-user/qemu-ppc64abi32 \ >> ./tests/tcg/ppc64abi32-linux-user/threadcount >>=20 >> which reports: >>=20 >> 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 >>=20 >> But when running with plugins we hit the failure a lot more often: >>=20 >> 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 >>=20 >> 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. >>=20 >> Signed-off-by: Alex Benn=C3=A9e >> Cc: David Gibson >> Cc: Philippe Mathieu-Daud=C3=A9 > > Acked-by: David Gibson > > 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? --=20 Alex Benn=C3=A9e