Comment 0 for bug 2011748

[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.

[Test case]

Boot the kernel on a physical arm64 board (i.e., kuzzle in our lab).