This bug is awaiting verification that the linux-azure/6.2.0-1009.9 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-lunar' to 'verification-done-lunar'. If the problem still exists, change the tag 'verification-needed-lunar' to 'verification-failed-lunar'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-lunar-linux-azure verification-needed-lunar -- 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/2011748 Title: lunar/linux 6.2 fails to boot on arm64 Status in linux package in Ubuntu: Fix Released Status in linux source package in Lunar: Fix Released Bug description: [Impact] On certain bare metal arm64 boards the latest lunar/linux 6.2.0-17-generic fails to boot, the kernel gets stuck reporting the following oops: [ 72.043484] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 72.049571] rcu: 22-...0: (30 GPs behind) idle=b10c/1/0x4000000000000000 softirq=164/164 fqs=6443 [ 72.058520] (detected by 28, t=15005 jiffies, g=449, q=174 ncpus=32) [ 72.064949] Task dump for CPU 22: [ 72.068251] task:kworker/u64:5 state:R running task stack:0 pid:447 ppid:2 flags:0x0000000a [ 72.078156] Workqueue: efi_rts_wq efi_call_rts [ 72.082595] Call trace: [ 72.085029] __switch_to+0xbc/0x100 The bug doesn't seem to happen on arm64 virtual machines, it happens only on physical arm64 systems. This regression has been introduced by: e7b813b32a42 ("efi: random: refresh non-volatile random seed when RNG is initialized") [Test case] Boot the kernel on a physical arm64 board (i.e., kuzzle in our lab). [Fix] Revert commit e7b813b32a42 for now, at the same time address this issue upstream in order to find a proper fix. [Regression potential] We may want to address this upstream to find a proper fix. Reverting the commit restores the previous behavior, but we also lose the capability of having a better RNG on the affected arm64 hardware. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2011748/+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
