apport information ** Attachment added: "Lspci.txt" https://bugs.launchpad.net/bugs/1790181/+attachment/5183061/+files/Lspci.txt
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1790181 Title: /proc/diskstats shows weird values Status in linux package in Ubuntu: Confirmed Bug description: For one block device on one of my servers munin shows abnormally high latency. When querying /proc/diskstats manually, the device in question shows: 8 32 sdc 973668 361965 64248290 10224376 755130 518162 22349256 1347171224 63 54302956 1357481880 Sanity check: If I divide the 7th value by the 4th value I get a avg read latency of about 10.5 ms. That is somewhat in line with the Avg. Read IO Wait Time of 11.35 ms that munin reports. The problem: If I divide the 11th value by the 8th value I get an avg write latency of 1789 ms. That is also close to the Avg. Write IO Wait Time of 1.60 s reported by munin. Now this is an SD card and it is slow, but not THAT slow.. To confirm unexpected values, I measured some activity: $ dd if=/dev/urandom of=testfile bs=1M count=100; time sync; cat /proc/diskstats 100+0 records in 100+0 records out 104857600 bytes (105 MB, 100 MiB) copied, 18,7652 s, 5,6 MB/s real 0m8,132s user 0m0,000s sys 0m0,007s The reported time spent writing went from 1353896856 before the test to 1356759112 after the test. The difference is 2862256 ms or about 2800 seconds that supposedly passed in just over 26 real time seconds. I repeated the test with count=1 and got 5780 ms IO write time reported in .7 s realtime. #1297522 describes a similar error but I have no idea if the cause is related. System information: Description: Ubuntu 18.04.1 LTS Release: 18.04 Linux 4.15.0-30-generic #32-Ubuntu SMP Thu Jul 26 17:42:43 UTC 2018 x86_64 x86_64 GNU/Linux /dev/sdc is a Dell dual SD card module in RAID 1 mode with two Lexar 8GB U3 cards. The system is a Dell R530. --- ProblemType: Bug AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Aug 11 22:30 seq crw-rw---- 1 root audio 116, 33 Aug 11 22:30 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=UUID=719079af-279c-46cd-9438-01086a2cb16e InstallationDate: Installed on 2016-03-29 (885 days ago) InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) MachineType: Dell Inc. PowerEdge R530 Package: linux (not installed) PciMultimedia: ProcFB: 0 mgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-30-generic root=UUID=9be44daa-0a66-486f-9fac-ff0814849ed3 ro crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-2G:128M,2G-:256M crashkernel=384M-2G:128M,2G-:256M crashkernel=384M-2G:128M,2G-:256M crashkernel=384M-2G:128M,2G-:256M crashkernel=384M-2G:128M,2G-:256M ProcVersionSignature: Ubuntu 4.15.0-30.32-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-30-generic N/A linux-backports-modules-4.15.0-30-generic N/A linux-firmware 1.173.1 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' Tags: bionic Uname: Linux 4.15.0-30-generic x86_64 UnreportableReason: This report is about a package that is not installed. UpgradeStatus: Upgraded to bionic on 2018-08-11 (19 days ago) UserGroups: adm cdrom dip libvirt libvirtd lpadmin plugdev sambashare sudo _MarkForUpload: False dmi.bios.date: 10/05/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.5.4 dmi.board.name: 0HFG24 dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.5.4:bd10/05/2015:svnDellInc.:pnPowerEdgeR530:pvr:rvnDellInc.:rn0HFG24:rvrA01:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge R530 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1790181/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
