[FS#804] kernel errors - rcu_sched detected stalls on CPUs/tasks

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - camel (camel) 

Attached to Project - LEDE Project
Summary - kernel errors - rcu_sched detected stalls on CPUs/tasks
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - current trunk
hardware: zbt3526 mt7621
it give more and more often this kernel bugs ...
(i did not have that much for 2 months ago)
can it be related to newer kernel on TRUNK ?

Thu May 25 18:20:04 2017 user.notice root: Subject: [router.xxx.com] KERNEL error/warnings issue - 2017-05-25:18:20:01
Thu May 25 18:20:39 2017 kern.err kernel: [ 4797.640000] INFO: rcu_sched detected stalls on CPUs/tasks:
Thu May 25 18:20:39 2017 kern.err kernel: [ 4797.640000] 	2-...: (0 ticks this GP) idle=dc4/0/0 softirq=370963/370963 fqs=0 
Thu May 25 18:20:39 2017 kern.err kernel: [ 4797.650000] 	(detected by 1, t=6003 jiffies, g=119392, c=119391, q=19565)
Thu May 25 18:20:39 2017 kern.info kernel: [ 4797.650000] Task dump for CPU 2:
Thu May 25 18:20:39 2017 kern.info kernel: [ 4797.660000] swapper/2       R running      0     0      1 0x00100000
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.660000] Stack : 00000000 00003a99 00000000 77de22c0 00000000 00000000 804df2a4 80490000
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.660000] 	  8048c75c 00000001 00000000 8048c5e0 8048c724 80490000 00000000 800135e4
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.660000] 	  00000000 814a37e0 8fc72000 8fc73ec0 80490000 8005ec74 1100fc03 00000002
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.660000] 	  00000000 80490000 804df2a4 8005ec6c 80490000 8001b1a8 1100fc03 00000000
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.660000] 	  00000004 8048c4a0 000000a0 8001b1b0 e8c7e2d3 3a8bf07f 2cfde824 eeff5ebf
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.660000] 	  ...
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.700000] Call Trace:
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.700000] [] __schedule+0x574/0x758
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.710000] [] r4k_wait_irqoff+0x0/0x20
Thu May 25 18:20:39 2017 kern.warn kernel: [ 4797.710000] 
Thu May 25 18:20:39 2017 kern.err kernel: [ 4797.710000] rcu_sched kthread starved for 6009 jiffies! g119392 c119391 f0x0 s3 ->state=0x1
   

 

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=804