From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Message-ID: <1489780991.17202.70.camel@infradead.org> Subject: Re: [PATCH v33 00/14] add kdump support From: David Woodhouse In-Reply-To: <372d44fe-2d78-596a-55c6-307cb36d60a2@arm.com> References: <20170315095656.24992-1-takahiro.akashi@linaro.org> <1489750991.17202.40.camel@infradead.org> <1489759373.17202.44.camel@infradead.org> <20170317153358.GI5940@leverpostej> <1489765628.17202.59.camel@infradead.org> <20170317162421.GK5940@leverpostej> <372d44fe-2d78-596a-55c6-307cb36d60a2@arm.com> Date: Fri, 17 Mar 2017 20:03:11 +0000 Mime-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0584107877332451559==" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Marc Zyngier , Mark Rutland Cc: geoff@infradead.org, kexec@lists.infradead.org, will.deacon@arm.com, AKASHI Takahiro , james.morse@arm.com, catalin.marinas@arm.com, bauerman@linux.vnet.ibm.com, dyoung@redhat.com, linux-arm-kernel@lists.infradead.org --===============0584107877332451559== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-/03ydH2dpN1rFb5X8v4B" --=-/03ydH2dpN1rFb5X8v4B Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2017-03-17 at 17:10 +0000, Marc Zyngier wrote: >=20 > > > >=20 > > > > FWIW if I trigger a crash on CPU 1 my kdump (still 4.9.8+v32) doesn= 't work. > > > > I end up booting the kdump kernel on CPU#1 and then it gets distinc= tly unhappy... > > > >=20 > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.000000] Booting Linux on physical CPU 0x= 1 > > > > ... > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017125] Detected PIPT I-cache on CPU1 > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017138] GICv3: CPU1: found redistributor= 0 region 0:0x00000000f0280000 > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017147] CPU1: Booted secondary processor= [411fd073] > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017339] Detected PIPT I-cache on CPU2 > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017347] GICv3: CPU2: found redistributor= 2 region 0:0x00000000f02c0000 > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017354] CPU2: Booted secondary processor= [411fd073] > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017537] Detected PIPT I-cache on CPU3 > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017545] GICv3: CPU3: found redistributor= 3 region 0:0x00000000f02e0000 > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017551] CPU3: Booted secondary processor= [411fd073] > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017576] Brought up 4 CPUs > > > > [=C2=A0=C2=A0=C2=A0=C2=A00.017587] SMP: Total of 4 processors activ= ated. > > > > ... > > > > [=C2=A0=C2=A0=C2=A031.745809] INFO: rcu_sched detected stalls on CP= Us/tasks: > > > > [=C2=A0=C2=A0=C2=A031.751299]=C2=A0 1-...: (30 GPs behind) idle=3Dc= 90/0/0 softirq=3D0/0 fqs=3D0=C2=A0 > > > > [=C2=A0=C2=A0=C2=A031.757557]=C2=A0 2-...: (30 GPs behind) idle=3D6= 08/0/0 softirq=3D0/0 fqs=3D0=C2=A0 > > > > [=C2=A0=C2=A0=C2=A031.763814]=C2=A0 3-...: (30 GPs behind) idle=3D6= 04/0/0 softirq=3D0/0 fqs=3D0=C2=A0 > > > > [=C2=A0=C2=A0=C2=A031.770069]=C2=A0 (detected by 0, t=3D5252 jiffie= s, g=3D-270, c=3D-271, q=3D0) > > > > [=C2=A0=C2=A0=C2=A031.776161] Task dump for CPU 1: > > > > [=C2=A0=C2=A0=C2=A031.779381] swapper/1=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0R=C2=A0=C2=A0running task=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A00=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A01 0x00000080 > > > > [=C2=A0=C2=A0=C2=A031.786446] Task dump for CPU 2: > > > > [=C2=A0=C2=A0=C2=A031.789666] swapper/2=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0R=C2=A0=C2=A0running task=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A00=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A01 0x00000080 > > > > [=C2=A0=C2=A0=C2=A031.796725] Task dump for CPU 3: > > > > [=C2=A0=C2=A0=C2=A031.799945] swapper/3=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0R=C2=A0=C2=A0running task=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A00=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A01 0x00000080 > > > >=20 > > > > Is some of that platform-specific? > > > That sounds like timer interrupts aren't being taken. > > >=20 > > > Given that the CPUs have come up, my suspicion would be that the GIC'= s > > > been left in some odd state, that the kdump kernel hasn't managed to > > > recover from. > > >=20 > > > Marc may have an idea. > > I thought kdump was UP only? Anyway, this doesn't look too good. > >=20 > > It would be interesting to find out whether we're still taking > > interrupts. Also, being able to reproduce this on mainline would be use= ful. > >=20 > > I wonder if we don't have a bug when booting on something other than > > CPU#0, possibly on a GICv3 platform... I'll give it a go. > Went ahead and tried a couple of kexecs with various CPUs disabled in > order to force kexec not to boot on CPU#0, and the VM did boot just fine. >=20 > So I'd really appreciate a mainline reproducer. I booted an up-to-date 4.11-rc2 kernel with the v33 patch set. I cannot reproduce. But then again, I can't reproduce it on 4.9 *either* any more. And that is precisely the same kernel image I uploaded earlier. So it appears to be sporadic, and just *happened* to hit me the first time I tried... which is probably just as well or I'd never have tried that again :) I'll keep trying. --=-/03ydH2dpN1rFb5X8v4B Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCDzUw ggSvMIIDl6ADAgECAhEA4CPLFRKDU4mtYW56VGdrITANBgkqhkiG9w0BAQsFADBvMQswCQYDVQQG EwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVybmFsIFRU UCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MB4XDTE0MTIyMjAw MDAwMFoXDTIwMDUzMDEwNDgzOFowgZsxCzAJBgNVBAYTAkdCMRswGQYDVQQIExJHcmVhdGVyIE1h bmNoZXN0ZXIxEDAOBgNVBAcTB1NhbGZvcmQxGjAYBgNVBAoTEUNPTU9ETyBDQSBMaW1pdGVkMUEw PwYDVQQDEzhDT01PRE8gU0hBLTI1NiBDbGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBF bWFpbCBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAImxDdp6UxlOcFIdvFamBia3 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