attached patch with fix tested with 4.4.0-45.66 note that instead of hardcoding the patched variant of lookup_bdev, it might make sense to adapt the zfs automake files to autodetect and handle both one parameter and two parameter variants?
that way, all three variations of building the zfs module would work: dkms source with either an Ubuntu or upstream kernel Ubuntu kernel with zfs module source in module/zfs/ ** Patch added: "zfs-fix-zpool-import-bug-with-nested-pools.patch" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1636517/+attachment/4767015/+files/zfs-fix-zpool-import-bug-with-nested-pools.patch -- 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/1636517 Title: zfs: importing zpool with vdev on zvol hangs kernel Status in linux package in Ubuntu: Confirmed Bug description: if a zvol of an existing, already imported zpool is a vdev of another zpool, a call to "zpool import" will everything zfs related. the stack trace is as follows: [<ffffffffc038d374>] taskq_wait+0x74/0xe0 [spl] [<ffffffffc038d42b>] taskq_destroy+0x4b/0x100 [spl] [<ffffffffc04a4afd>] vdev_open_children+0x12d/0x180 [zfs] [<ffffffffc04ae6cc>] vdev_root_open+0x3c/0xc0 [zfs] [<ffffffffc04a45f5>] vdev_open+0xf5/0x4d0 [zfs] [<ffffffffc048f11e>] spa_load+0x39e/0x1c60 [zfs] [<ffffffffc049170d>] spa_tryimport+0xad/0x450 [zfs] [<ffffffffc04c42d4>] zfs_ioc_pool_tryimport+0x64/0xa0 [zfs] [<ffffffffc04c770b>] zfsdev_ioctl+0x44b/0x4e0 [zfs] [<ffffffff8122124f>] do_vfs_ioctl+0x29f/0x490 [<ffffffff812214b9>] SyS_ioctl+0x79/0x90 [<ffffffff818318b2>] entry_SYSCALL_64_fastpath+0x16/0x71 [<ffffffffffffffff>] 0xffffffffffffffff I traced this back to 193fb6a2c94fab8eb8ce70a5da4d21c7d4023bee (merged in 4.4.0-6.21), which added a second parameter to lookup_bdev without patching the zfs module (which needs to special case the vdev-on-zvol case, and uses this exact method only in this special casing code path). attached you can find the output of "zfs send -R" ing such a zvol ("brokenvol.raw"), running "zfs receive POOL/TARGET < FILE" followed by "zpool import" should reproduce the hang. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-45-generic 4.4.0-45.66 ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21 Uname: Linux 4.4.0-45-generic x86_64 NonfreeKernelModules: zfs zunicode zcommon znvpair zavl AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Oct 25 15:46 seq crw-rw---- 1 root audio 116, 33 Oct 25 15:46 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Tue Oct 25 15:49:51 2016 HibernationDevice: RESUME=/dev/mapper/xenial--vg-swap_1 InstallationDate: Installed on 2016-10-25 (0 days ago) InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: QEMU Standard PC (i440FX + PIIX, 1996) PciMultimedia: ProcFB: 0 qxldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-45-generic root=/dev/mapper/hostname--vg-root ro RelatedPackageVersions: linux-restricted-modules-4.4.0-45-generic N/A linux-backports-modules-4.4.0-45-generic N/A linux-firmware 1.157.4 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2014 dmi.bios.vendor: SeaBIOS dmi.bios.version: rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org dmi.chassis.type: 1 dmi.chassis.vendor: QEMU dmi.chassis.version: pc-i440fx-2.7 dmi.modalias: dmi:bvnSeaBIOS:bvrrel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-2.7:cvnQEMU:ct1:cvrpc-i440fx-2.7: dmi.product.name: Standard PC (i440FX + PIIX, 1996) dmi.product.version: pc-i440fx-2.7 dmi.sys.vendor: QEMU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1636517/+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
