This issue is not any of the above mentioned bugs, after some checking. This is possibly enablement of new HW as BradF suggested might be the case, and Dan Streetman identified the driver/device in question.
Driver: megaraid_sas PCI dev id: 0016 #define PCI_DEVICE_ID_LSI_HARPOON 0x0016 All of the following commits went in into v4.11-rc1. The following is the commit that enables the PCI dev id: 45f4f2eb3da3cbff02c3d77c784c81320c733056 scsi: megaraid_sas: Add new pci device Ids for SAS3.5 Generic Megaraid Controllers Set of patches related to this (there might be others): 223e4b93e61f7538681632bfb19edd4f27a0c319 scsi: megaraid_sas: driver version upgrade ede7c3ce82dc4001bbab33dddebab8c089f309e0 scsi: megaraid_sas: Implement the PD Map support for SAS3.5 Generic Megaraid Controllers b71b49c209facf8fec3778142ae5e45bb6ca4afc scsi: megaraid_sas: ldio_outstanding variable is not decremented in completion path 3e5eadb1a881bea2e3fa41f5ae7cdbfa36222d37 scsi: megaraid_sas: Enable or Disable Fast path based on the PCI Threshold Bandwidth 9581ebebbe351d99579e8701e238c2771ccdae93 scsi: megaraid_sas: Add the Support for SAS3.5 Generic Megaraid Controllers Capabilities d889344e4e59eb962894ab3b64042dc37a2d8b39 scsi: megaraid_sas: Dynamic Raid Map Changes for SAS3.5 Generic Megaraid Controllers 69c337c0f8d74d71e085efa8869be9fc51e5962b scsi: megaraid_sas: SAS3.5 Generic Megaraid Controllers Fast Path for RAID 1/10 Writes fdd84e2514b0157219720cf8f3f55757938a39cd scsi: megaraid_sas: SAS3.5 Generic Megaraid Controllers Stream Detection and IO Coalescing 45d446038c7b93c40b2fe5ba0e95380f19e0493e scsi: megaraid_sas: EEDP Escape Mode Support for SAS3.5 Generic Megaraid Controllers 2493c67e518c772a573c3b1ad02e7ced5b53f6ca scsi: megaraid_sas: 128 MSIX Support 45f4f2eb3da3cbff02c3d77c784c81320c733056 scsi: megaraid_sas: Add new pci device Ids for SAS3.5 Generic Megaraid Controllers <--- I will try and confirm that it is the above case, in which case we likely will not backport to 4.4/Xenial or FIPS, as it is new HW enablement. -- 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/1809168 Title: FIPS and Ubuntu standard kernels prior to 4.11.0 won't boot; root device not found Status in linux package in Ubuntu: Triaged Status in linux source package in Xenial: Triaged Bug description: [IMPACT] Booting of the Xenial-based FIPS kernel packages failed with disk not found errors on amd64. This was also observed on standard Ubuntu kernels prior to 4.11.0. FIPS ------ 1. linux-image-4.4.0-1002-fips <-- FAIL 2. linux-image-4.4.0-1006-fips <-- FAIL UBUNTU ------------ 1. Bionic kernels all WORK 2. Artful kernels: Ubuntu-4.11.0-1.6 <-- WORKS Ubuntu-4.10.0-26.30 <-- FAILS 3. Xenial kernels: Ubuntu-hwe-4.11.0-12.17_16.04.1 <--- WORKS Ubuntu-hwe-4.10.0-43.47_16.04.1 <--- FAILS Ubuntu-lts-* <--- ALL FAIL Ubuntu-4.4.0-* <--- ALL FAIL We have narrowed down the window to be: 4.11.0-1.6 (custom build) <--- WORKS 4.10.0-43.47~16.04.1 <-- FAILS Also works: https://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11/linux-image-4.11.0-041100-generic_4.11.0-041100.201705041534_amd64.deb Symptoms ------------- System cannot find the root disk and drops into an initramfs shell: mdadm script local-block "CREATE group disk not found" "Gave up waiting for root device. Common problems: - Boot args (cat /proc/cmdline) - Check rootdelay=... - Check root= ... - Missing modules (cat /proc/modules; ls/dev) ALERT! UUID=... does not exist. Dropping to a shell! ... (initramfs)_ There does not appear to be any workaround so far. The disks are encrypted SSDs. Attaching commit list between the last known failing Artful kernel and earliest known working kernel (adjacent tags) and other info. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1809168/+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
