[FS#804] mt7621: kernel errors - rcu_sched detected stalls on CPUs/tasks

[LEDE Bugs]

The following task has a new comment added:

FS#804 - mt7621: kernel errors - rcu_sched detected stalls on CPUs/tasks
User who did this - camel (camel)

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hm,, i tested current trunk ....(without traffic shapping packages installed and same result ...
Sat Jul 22 13:55:48 2017 kern.err kernel: [ 6282.000000] INFO: rcu_sched detected stalls on CPUs/tasks:
Sat Jul 22 13:55:48 2017 kern.err kernel: [ 6282.000000]        2-...: (0 ticks this GP) idle=550/0/0 softirq=447446/447446 fqs=1
Sat Jul 22 13:55:48 2017 kern.err kernel: [ 6282.010000]        (detected by 3, t=6003 jiffies, g=152339, c=152338, q=631052)
Sat Jul 22 13:55:48 2017 kern.info kernel: [ 6282.010000] Task dump for CPU 2:
Sat Jul 22 13:55:48 2017 kern.info kernel: [ 6282.020000] swapper/2       R  running task        0     0      1 0x00100000
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.020000] Stack : 00000068 00000001 00000001 001bb9fe 00000000 778892c0 00000000 00000000
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.030000]         804e148c 00000004 8047f934 804f0000 00000001 00000001 bfbf8000 00000000
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.040000]         00000000 8000c1cc 00000000 00000000 8fc74000 8fc75f00 00000000 80062f44
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.050000]         1100fc03 00000003 00000001 804e148c 804e148c 80062f3c 00000005 00000000
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.060000]         00000000 00000001 00000005 00000000 00000000 00000001 00000001 803ec0b4
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.070000]         ...
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.070000] Call Trace:
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.070000] [] __schedule+0x5d4/0x7a4
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.080000] [] r4k_wait_irqoff+0x0/0x20
Sat Jul 22 13:55:48 2017 kern.err kernel: [ 6282.080000] rcu_sched kthread starved for 3035 jiffies! g152339 c152338 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x1
Sat Jul 22 13:55:48 2017 kern.info kernel: [ 6282.090000] rcu_sched       S    0     7      2 0x00100000
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.100000] Stack : 814a9bc0 8fc52340 8fc6be50 814a8320 8fc6be50 804e0000 00000001 8007b548
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.100000]         814a8320 000914e6 814a8320 8fc6be50 804e0000 00000000 804f0000 804e0000
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.110000]         804e96b0 803e8644 000914e6 804e0000 8fc6be50 814a8320 000914e6 803eafa8
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.120000]         8fc6a000 8fc6be60 804e9580 804e96b0 814aa240 00000001 8e97f008 8e979408
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.130000]         000914e6 8007ba44 8fc52340 44800002 804e9580 00000001 804e0000 00000000
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.140000]         ...
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.140000] Call Trace:
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.140000] [] __schedule+0x5d4/0x7a4
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.150000] [] schedule+0x6c/0x84
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.150000] [] schedule_timeout+0x160/0x19c
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.160000] [] rcu_gp_kthread+0x7f4/0x7fc
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.160000] [] kthread+0xd8/0xec
Sat Jul 22 13:55:48 2017 kern.warn kernel: [ 6282.170000] [] ret_from_kernel_thread+0x14/0x1c

happening per day ~30 times ...
device: MT7621 - zbt3526


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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=804#comment3051