This bug was fixed in the package linux - 6.2.0-18.18
---------------
linux (6.2.0-18.18) lunar; urgency=medium
* lunar/linux: 6.2.0-18.18 -proposed tracker (LP: #2011750)
* lunar/linux 6.2 fails to boot on arm64 (LP: #2011748)
- SAUCE: Revert "efi: random: fix NULL-deref when refreshing seed"
- SAUCE: Revert "efi: random: refresh non-volatile random seed when RNG is
initialized"
-- Andrea Righi <andrea.ri...@canonical.com> Wed, 15 Mar 2023 23:54:18
+0100
** Changed in: linux (Ubuntu Lunar)
Status: Fix Committed => Fix Released
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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.
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