I just saw this for the first time on clearfog gt 8k and a crash, tried to strip things to get it more stable.
Partial from console.
type or paste co[86758.943289] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
[86758.949268] rcu: 1-...0: (7 ticks this GP) idle=1e2/1/0x4000000000000000 softirq=668658/66
[86758.958887] (detected by 0, t=2102 jiffies, g=1212889, q=50)
[86758.964664] Task dump for CPU 1:
[86758.967912] task:kworker/1:2 state:R running task stack: 0 pid:23459 ppid: 2 fa
[86758.977901] Workqueue: events 0xffffffc0105a74d0
[86758.982549] Call trace:
[86758.985011] 0xffffffc010007da0
[86758.988172] 0xffffff813ffa2f00de here
Haven't really cought this, and have been leaving console attached to catch it.
So turns out that it may be the same issue, hip hooray for pin cables being able to go past corners on USB3 port. Relevant for both armada8040 and CN9130 pro now.
compex wave 5 card in what's marked SRD2, not checking what it's called in u-boot or DTS, but likely CON1, with CON0 as SFP. Back side is CON2. Never been very stable pcie drivers or perhaps its electromechanics?