** Attachment added: "syslog entries showing several "blocked for more than 120 seconds" errors" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1896521/+attachment/5413021/+files/syslog
-- 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/1896521 Title: Mounting a logical volume on a Drobo 5D will hang Status in linux package in Ubuntu: New Bug description: Given these logical volumes on a Drobo 5D mounting will result in a hang: root@atx1:/var/log# lvs vg-drobo LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert encrypted vg-drobo -wi-a----- 1000.00g persistent vg-drobo -wi-a----- 600.00g timber vg-drobo -wi-ao---- 1.50t timber2 vg-drobo -wi-ao---- 1.00t root@atx1:/var/log# mount /dev/vg-drobo/timber /mnt/drobo-timber/ # hangs I expect the mount to succeed without hanging. This bug is not present in 16.04 / 16.04.1 (latest is linux-4.4.0-189-generic). Release bisection revealed it showed up in u16.04.2: linux-4.8.0-36-generic from LiveCD. I found it when finally upgrading a 16.04 host which was using 4.4 kernel to 18.04 which uses 4.15 (LTS) / 5.4 (HWE) kernels. After further commit bisection I found the commit which introduced this behavior is: https://git.launchpad.net/~ubuntu- kernel/ubuntu/+source/linux/+git/bionic/commit/?id=5b91dfe187bbe3a8116432016375f39fff91a237 ---- $ git show 5b91dfe187bb Mon Apr 18 13:09:10 2016 +0300 5b91dfe187bb usb: storage: scsiglue: limit USB3 devices to 2048 sectors [Felipe Balbi] diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c index 9da1fb3d0ff4..88920142e375 100644 --- a/drivers/usb/storage/scsiglue.c +++ b/drivers/usb/storage/scsiglue.c @@ -133,6 +133,11 @@ static int slave_configure(struct scsi_device *sdev) * let the queue segment size sort out the real limit. */ blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF); + } else if (us->pusb_dev->speed >= USB_SPEED_SUPER) { + /* USB3 devices will be limited to 2048 sectors. This gives us + * better throughput on most devices. + */ + blk_queue_max_hw_sectors(sdev->request_queue, 2048); } /* Some USB host controllers can't do DMA; they have to use PIO. ---- I built kernels with this change commented out and confirmed I can successfully mount the LV from the Drobo using 4.8 and 4.15 kernels. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-117-generic 4.15.0-117.118 ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18 Uname: Linux 4.15.0-117-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.17 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. Date: Mon Sep 21 12:37:39 2020 HibernationDevice: #RESUME=UUID=64794be3-24a0-49f9-9239-371624a3d193 RESUME=none InstallationDate: Installed on 2020-09-20 (0 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) IwConfig: enp0s31f6 no wireless extensions. lo no wireless extensions. MachineType: System manufacturer System Product Name ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-117-generic root=/dev/mapper/vg--ssd2tb-u18040 ro PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.15.0-117-generic N/A linux-backports-modules-4.15.0-117-generic N/A linux-firmware 1.173.19 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/15/2018 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3802 dmi.board.asset.tag: Default string dmi.board.name: MAXIMUS VIII RANGER dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3802:bd03/15/2018:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnMAXIMUSVIIIRANGER:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1896521/+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
