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In-Reply-To: MIME-Version: 1.0 User-Agent: astroid/0.14.0 (https://github.com/astroidmail/astroid) Message-Id: <1560147822.prx4jq4u2h.astroid@bobo.none> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" bugzilla-daemon@bugzilla.kernel.org's on June 7, 2019 4:29 pm: > https://bugzilla.kernel.org/show_bug.cgi?id=3D203837 >=20 > --- Comment #2 from Paul Mackerras (paulus@ozlabs.org) --- > Just tried 5.1.7 in the host and got the guest locking up during boot. In= xmon > I see one cpu in pmdp_invalidate and another in handle_mm_fault. It seems= very > possible this is the bug that Nick Piggin's recent patch series fixes > ("powerpc/64s: Fix THP PMD collapse serialisation"): >=20 > http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=3D112348 It's worth a try, although the bug was introduced around 4.20 and I wasn't able to trigger it on radix, but other timing changes could cause it to trigger I suppose. pdbg (https://github.com/open-power/pdbg) is a useful tool for your BMC that can often get the CPU registers out even for bad crashes, this might help to narrow down the problem without bisecting. Thanks, Nick =