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([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id h3-20020a02c723000000b0041fb2506011sm542842jao.172.2023.07.27.10.39.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Jul 2023 10:39:20 -0700 (PDT) Sender: Guenter Roeck Message-ID: <2f4b012e-1f95-30aa-3f43-c31e84cb2c42@roeck-us.net> Date: Thu, 27 Jul 2023 10:39:17 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Content-Language: en-US To: paulmck@kernel.org Cc: Joel Fernandes , Pavel Machek , Greg Kroah-Hartman , stable@vger.kernel.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, shuah@kernel.org, patches@kernelci.org, lkft-triage@lists.linaro.org, jonathanh@nvidia.com, f.fainelli@gmail.com, sudipm.mukherjee@gmail.com, srw@sladewatkins.net, rwarsow@gmx.de, conor@kernel.org, rcu@vger.kernel.org References: <78722041-D1F7-45FA-BA1C-41B92209BA6C@joelfernandes.org> <0751f5a8-2727-4a08-8bb8-50bbd4244c9c@paulmck-laptop> <67eba84a-ae24-2983-a756-463f39f3ca71@roeck-us.net> From: Guenter Roeck Subject: Re: [PATCH 6.4 000/227] 6.4.7-rc1 review In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, NICE_REPLY_A,RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/27/23 09:07, Paul E. McKenney wrote: ...] >> No. However, (unrelated) in linux-next, rcu tests sometimes result in apparent hangs >> or long runtime. >> >> [ 0.778841] Mount-cache hash table entries: 512 (order: 0, 4096 bytes, linear) >> [ 0.779011] Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes, linear) >> [ 0.797998] Running RCU synchronous self tests >> [ 0.798209] Running RCU synchronous self tests >> [ 0.912368] smpboot: CPU0: AMD Opteron 63xx class CPU (family: 0x15, model: 0x2, stepping: 0x0) >> [ 0.923398] RCU Tasks: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1. >> [ 0.925419] Running RCU-tasks wait API self tests >> >> (hangs until aborted). This is primarily with Opteron CPUs, but also with others such as Haswell, >> Icelake-Server, and pentium3. It is all but impossible to bisect because it doesn't happen >> all the time. All I was able to figure out was that it has to do with rcu changes in linux-next. >> I'd be much more concerned about that. > > First I have heard of this, so thank you for letting me know. > > About what fraction of the time does this happen? > Here is a sample test log from yesterday's -next. This is with x86_64. Today's -next always crashes, so no data. Building x86_64:q35:Broadwell-noTSX:defconfig:smp:net,e1000:mem256:ata:hd ... running ....... passed Building x86_64:q35:Cascadelake-Server:defconfig:smp:net,e1000e:mem256:ata:cd ... running .................R....... passed Building x86_64:q35:IvyBridge:defconfig:smp2:net,i82801:efi:mem512:nvme:hd ... running ...... passed Building x86_64:q35:SandyBridge:defconfig:smp4:net,ne2k_pci:efi32:mem1G:usb:hd ... running ......... passed Building x86_64:q35:SandyBridge:defconfig:smp8:net,ne2k_pci:mem1G:usb-hub:hd ... running ....... passed Building x86_64:q35:Haswell:defconfig:smp:tpm-tis:net,pcnet:mem2G:usb-uas:hd ... running .................R.... passed Building x86_64:q35:Skylake-Client:defconfig:smp2:tpm-tis:net,rtl8139:efi:mem4G:sdhci:mmc:hd ... running ....... passed Building x86_64:q35:Conroe:defconfig:smp4:net,tulip:efi32:mem256:scsi[DC395]:hd ... running ....... passed Building x86_64:q35:Denverton:defconfig:smp2:net,tulip:efi:mem256:scsi[DC395]:hd ... running ....... passed Building x86_64:q35:EPYC-Milan:defconfig:smp:tpm-crb:net,tulip:mem256:scsi[DC395]:hd ... running ....... passed Building x86_64:q35:Nehalem:defconfig:smp:net,virtio-net:mem512:scsi[AM53C974]:hd ... running ....... passed Building x86_64:q35:Nehalem:defconfig:smp:net,virtio-net-old:mem512:scsi[AM53C974]:hd ... running ....... passed Building x86_64:q35:Westmere-IBRS:defconfig:smp2:tpm-crb:net,usb-ohci:efi:mem1G:scsi[53C810]:cd ... running .................R........... passed Building x86_64:q35:Skylake-Server:defconfig:smp4:tpm-tis:net,e1000-82544gc:efi32:mem2G:scsi[53C895A]:hd ... running ............. passed Building x86_64:pc:EPYC:defconfig:smp:pci-bridge:net,usb-uhci:mem4G:scsi[FUSION]:hd ... running ..................R.......... passed Building x86_64:q35:EPYC-IBPB:defconfig:smp2:net,e1000-82545em:efi:mem8G:scsi[MEGASAS]:hd ... running ....... passed Building x86_64:q35:Opteron_G5:defconfig:smp4:net,i82559c:efi32:mem256:scsi[MEGASAS2]:hd ... running ...... passed Building x86_64:q35:Opteron_G5:defconfig:smp4:net,i82559c:mem256:scsi[MEGASAS2]:hd ... running .................R.............. failed (silent) Building x86_64:pc:Opteron_G5:defconfig:smp4:net,i82559c:mem256:scsi[MEGASAS2]:hd ... running .......... passed Building x86_64:pc:phenom:defconfig:smp:net,i82559er:mem512:initrd ... running ........ passed Building x86_64:q35:Opteron_G1:defconfig:smp2:net,i82562:efi:mem1G:initrd ... running ...... passed Building x86_64:pc:Opteron_G2:defconfig:smp:net,usb:efi32:mem2G:scsi[virtio-pci]:hd ... running .................R................. passed Building x86_64:pc:Opteron_G2:defconfig:smp:net,usb:efi32:mem2G:scsi[virtio-pci-old]:hd ... running ................... passed Building x86_64:q35:core2duo:defconfig:smp2:net,i82559a:mem4G:virtio-pci:hd ... running ......... passed Building x86_64:q35:Broadwell:defconfig:smp4:net,i82558b:efi:mem8G:virtio:hd ... running ....... passed Building x86_64:q35:Nehalem:defconfig:smp2:net,i82558a:efi32:mem1G:virtio:hd ... running .................R... passed Building x86_64:q35:Icelake-Server:defconfig:preempt:smp4:net,ne2k_pci:efi:mem2G:virtio:cd ... running ......... passed Building x86_64:q35:Icelake-Server:defconfig:preempt:smp8:net,i82557a:mem4G:nvme:hd ... running ...... passed Building x86_64:q35:Skylake-Client-IBRS:defconfig:preempt:smp2:net,i82558b:efi32:mem1G:sdhci:mmc:hd ... running ...... passed Building x86_64:q35:KnightsMill:defconfig:preempt:smp6:net,i82550:mem512:initrd ... running ...... passed Building x86_64:q35:Cooperlake:defconfig:smp2:net,usb-ohci:efi:mem1G:scsi[53C810]:hd ... running ....... passed Building x86_64:q35:EPYC-Rome:defconfig:smp4:net,igb:mem2G:scsi[53C895A]:hd ... running ......... passed Building x86_64:pc:Opteron_G3:defconfig:nosmp:net,e1000:mem1G:usb:hd ... running ....................R................. failed (silent) Building x86_64:q35:Opteron_G4:defconfig:nosmp:net,ne2k_pci:efi:mem512:ata:hd ... running .....................R....... passed Building x86_64:q35:Haswell-noTSX-IBRS:defconfig:nosmp:net,pcnet:efi32:mem2G:ata:hd ... running .................R.............. failed (silent) An earlier test run: Building x86_64:q35:Broadwell-noTSX:defconfig:smp:net,e1000:mem256:ata:hd ... running ....... passed Building x86_64:q35:Cascadelake-Server:defconfig:smp:net,e1000e:mem256:ata:cd ... running .................R....... passed Building x86_64:q35:IvyBridge:defconfig:smp2:net,i82801:efi:mem512:nvme:hd ... running ........ passed Building x86_64:q35:SandyBridge:defconfig:smp4:net,ne2k_pci:efi32:mem1G:usb:hd ... running .......... passed Building x86_64:q35:SandyBridge:defconfig:smp8:net,ne2k_pci:mem1G:usb-hub:hd ... running ....... passed Building x86_64:q35:Haswell:defconfig:smp:tpm-tis:net,pcnet:mem2G:usb-uas:hd ... running .................R.... passed Building x86_64:q35:Skylake-Client:defconfig:smp2:tpm-tis:net,rtl8139:efi:mem4G:sdhci:mmc:hd ... running ....... passed Building x86_64:q35:Conroe:defconfig:smp4:net,tulip:efi32:mem256:scsi[DC395]:hd ... running ......... passed Building x86_64:q35:Denverton:defconfig:smp2:net,tulip:efi:mem256:scsi[DC395]:hd ... running ....... passed Building x86_64:q35:EPYC-Milan:defconfig:smp:tpm-crb:net,tulip:mem256:scsi[DC395]:hd ... running ....... passed Building x86_64:q35:Nehalem:defconfig:smp:net,virtio-net:mem512:scsi[AM53C974]:hd ... running ....... passed Building x86_64:q35:Nehalem:defconfig:smp:net,virtio-net-old:mem512:scsi[AM53C974]:hd ... running ........ passed Building x86_64:q35:Westmere-IBRS:defconfig:smp2:tpm-crb:net,usb-ohci:efi:mem1G:scsi[53C810]:cd ... running .......... passed Building x86_64:q35:Skylake-Server:defconfig:smp4:tpm-tis:net,e1000-82544gc:efi32:mem2G:scsi[53C895A]:hd ... running .................R..... passed Building x86_64:pc:EPYC:defconfig:smp:pci-bridge:net,usb-uhci:mem4G:scsi[FUSION]:hd ... running .................R.............. failed (silent) Building x86_64:q35:EPYC-IBPB:defconfig:smp2:net,e1000-82545em:efi:mem8G:scsi[MEGASAS]:hd ... running ....... passed Building x86_64:q35:Opteron_G5:defconfig:smp4:net,i82559c:efi32:mem256:scsi[MEGASAS2]:hd ... running ....... passed Building x86_64:q35:Opteron_G5:defconfig:smp4:net,i82559c:mem256:scsi[MEGASAS2]:hd ... running ....... passed Building x86_64:pc:Opteron_G5:defconfig:smp4:net,i82559c:mem256:scsi[MEGASAS2]:hd ... running .......... passed Building x86_64:pc:phenom:defconfig:smp:net,i82559er:mem512:initrd ... running ........ passed Building x86_64:q35:Opteron_G1:defconfig:smp2:net,i82562:efi:mem1G:initrd ... running ...... passed Building x86_64:pc:Opteron_G2:defconfig:smp:net,usb:efi32:mem2G:scsi[virtio-pci]:hd ... running .......... passed Building x86_64:pc:Opteron_G2:defconfig:smp:net,usb:efi32:mem2G:scsi[virtio-pci-old]:hd ... running .......... passed Building x86_64:q35:core2duo:defconfig:smp2:net,i82559a:mem4G:virtio-pci:hd ... running ...... passed Building x86_64:q35:Broadwell:defconfig:smp4:net,i82558b:efi:mem8G:virtio:hd ... running ....... passed Building x86_64:q35:Nehalem:defconfig:smp2:net,i82558a:efi32:mem1G:virtio:hd ... running ...... passed Building x86_64:q35:Icelake-Server:defconfig:preempt:smp4:net,ne2k_pci:efi:mem2G:virtio:cd ... running ......... passed Building x86_64:q35:Icelake-Server:defconfig:preempt:smp8:net,i82557a:mem4G:nvme:hd ... running ....... passed Building x86_64:q35:Skylake-Client-IBRS:defconfig:preempt:smp2:net,i82558b:efi32:mem1G:sdhci:mmc:hd ... running ....... passed Building x86_64:q35:KnightsMill:defconfig:preempt:smp6:net,i82550:mem512:initrd ... running ....... passed Building x86_64:q35:Cooperlake:defconfig:smp2:net,usb-ohci:efi:mem1G:scsi[53C810]:hd ... running ........ passed Building x86_64:q35:EPYC-Rome:defconfig:smp4:net,igb:mem2G:scsi[53C895A]:hd ... running ......... passed Building x86_64:pc:Opteron_G3:defconfig:nosmp:net,e1000:mem1G:usb:hd ... running ....................R................. failed (silent) Building x86_64:q35:Opteron_G4:defconfig:nosmp:net,ne2k_pci:efi:mem512:ata:hd ... running ....... passed Building x86_64:q35:Haswell-noTSX-IBRS:defconfig:nosmp:net,pcnet:efi32:mem2G:ata:hd ... running ....... passed "R" means retry, and the dots reflect time expired. It looks like it happens most of the time, but not always, on affected CPUs. I don't have specific data for non-Intel CPUs. I don't think I see the problem there, but there is too much interference from other problems to be sure. For comparison, here is the result from the latest mainline: Building x86_64:q35:Broadwell-noTSX:defconfig:smp:net,e1000:mem256:ata:hd ... running ....... passed Building x86_64:q35:Cascadelake-Server:defconfig:smp:net,e1000e:mem256:ata:cd ... running .......... passed Building x86_64:q35:IvyBridge:defconfig:smp2:net,i82801:efi:mem512:nvme:hd ... running ...... passed Building x86_64:q35:SandyBridge:defconfig:smp4:net,ne2k_pci:efi32:mem1G:usb:hd ... running ......... passed Building x86_64:q35:SandyBridge:defconfig:smp8:net,ne2k_pci:mem1G:usb-hub:hd ... running ........... passed Building x86_64:q35:Haswell:defconfig:smp:tpm-tis:net,pcnet:mem2G:usb-uas:hd ... running ........ passed Building x86_64:q35:Skylake-Client:defconfig:smp2:tpm-tis:net,rtl8139:efi:mem4G:sdhci:mmc:hd ... running ....... passed Building x86_64:q35:Conroe:defconfig:smp4:net,tulip:efi32:mem256:scsi[DC395]:hd ... running ....... passed Building x86_64:q35:Denverton:defconfig:smp2:net,tulip:efi:mem256:scsi[DC395]:hd ... running ....... passed Building x86_64:q35:EPYC-Milan:defconfig:smp:tpm-crb:net,tulip:mem256:scsi[DC395]:hd ... running ....... passed Building x86_64:q35:Nehalem:defconfig:smp:net,virtio-net:mem512:scsi[AM53C974]:hd ... running ....... passed Building x86_64:q35:Nehalem:defconfig:smp:net,virtio-net-old:mem512:scsi[AM53C974]:hd ... running ....... passed Building x86_64:q35:Westmere-IBRS:defconfig:smp2:tpm-crb:net,usb-ohci:efi:mem1G:scsi[53C810]:cd ... running .......... passed Building x86_64:q35:Skylake-Server:defconfig:smp4:tpm-tis:net,e1000-82544gc:efi32:mem2G:scsi[53C895A]:hd ... running ....... passed Building x86_64:pc:EPYC:defconfig:smp:pci-bridge:net,usb-uhci:mem4G:scsi[FUSION]:hd ... running ............. passed Building x86_64:q35:EPYC-IBPB:defconfig:smp2:net,e1000-82545em:efi:mem8G:scsi[MEGASAS]:hd ... running ....... passed Building x86_64:q35:Opteron_G5:defconfig:smp4:net,i82559c:efi32:mem256:scsi[MEGASAS2]:hd ... running ....... passed Building x86_64:q35:Opteron_G5:defconfig:smp4:net,i82559c:mem256:scsi[MEGASAS2]:hd ... running ...... passed Building x86_64:pc:Opteron_G5:defconfig:smp4:net,i82559c:mem256:scsi[MEGASAS2]:hd ... running ......... passed Building x86_64:pc:phenom:defconfig:smp:net,i82559er:mem512:initrd ... running ......... passed Building x86_64:q35:Opteron_G1:defconfig:smp2:net,i82562:efi:mem1G:initrd ... running ......... passed Building x86_64:pc:Opteron_G2:defconfig:smp:net,usb:efi32:mem2G:scsi[virtio-pci]:hd ... running ......... passed Building x86_64:pc:Opteron_G2:defconfig:smp:net,usb:efi32:mem2G:scsi[virtio-pci-old]:hd ... running ......... passed Building x86_64:q35:core2duo:defconfig:smp2:net,i82559a:mem4G:virtio-pci:hd ... running ...... passed Building x86_64:q35:Broadwell:defconfig:smp4:net,i82558b:efi:mem8G:virtio:hd ... running ....... passed Building x86_64:q35:Nehalem:defconfig:smp2:net,i82558a:efi32:mem1G:virtio:hd ... running ...... passed Building x86_64:q35:Icelake-Server:defconfig:preempt:smp4:net,ne2k_pci:efi:mem2G:virtio:cd ... running ............ passed Building x86_64:q35:Icelake-Server:defconfig:preempt:smp8:net,i82557a:mem4G:nvme:hd ... running ....... passed Building x86_64:q35:Skylake-Client-IBRS:defconfig:preempt:smp2:net,i82558b:efi32:mem1G:sdhci:mmc:hd ... running ...... passed Building x86_64:q35:KnightsMill:defconfig:preempt:smp6:net,i82550:mem512:initrd ... running ...... passed Building x86_64:q35:Cooperlake:defconfig:smp2:net,usb-ohci:efi:mem1G:scsi[53C810]:hd ... running ....... passed Building x86_64:q35:EPYC-Rome:defconfig:smp4:net,igb:mem2G:scsi[53C895A]:hd ... running .......... passed Building x86_64:pc:Opteron_G3:defconfig:nosmp:net,e1000:mem1G:usb:hd ... running .......... passed Building x86_64:q35:Opteron_G4:defconfig:nosmp:net,ne2k_pci:efi:mem512:ata:hd ... running ...... passed Building x86_64:q35:Haswell-noTSX-IBRS:defconfig:nosmp:net,pcnet:efi32:mem2G:ata:hd ... running ...... passed Guenter