lunar/linux 6.2 fails to boot on arm64
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Lunar |
Fix Released
|
Undecided
|
Unassigned |
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/
[ 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_
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.
description: | updated |
Changed in linux (Ubuntu Lunar): | |
status: | Incomplete → Fix Committed |
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 2011748
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.