[LEDE-DEV] [PATCH] [17.01] Kernel: bump to 4.4.51

[Stijn Segers]

So...


I have been running on 4.4.51 on a few days now but it looks like 
there's some weird stuff going on on my DIR-860L... I don't know if 
this is merely a timeline coincidence or if it's something linked to 
.51 (or .50).

I checked its uptime and it reported < 2h (flashed it two days ago), 
wifi connection periodically craps out, when I check if my desktop 
still has a wired connection, it shows the router doesn't respond to 
DHCP requests anymore either... DNS is broken as well. Restarting both 
dnsmasq (DHCP) and Unbound (DNS) services doesn't work, they keep 
hanging for some reason.

I have a few traces like these in logread:

Sat Feb 25 20:10:09 2017 kern.err kernel: [ 3040.980000] INFO: 
rcu_sched detected stalls on CPUs/tasks:
Sat Feb 25 20:10:09 2017 kern.err kernel: [ 3040.990000] 	3-...: (0 
ticks this GP) idle=4b8/0/0 softirq=1265/1265 fqs=0
Sat Feb 25 20:10:09 2017 kern.err kernel: [ 3041.000000] 	(detected by 
1, t=6004 jiffies, g=4116, c=4115, q=2999)
Sat Feb 25 20:10:09 2017 kern.info kernel: [ 3041.010000] Task dump for 
CPU 3:
Sat Feb 25 20:10:09 2017 kern.info kernel: [ 3041.020000] swapper/3     
  R running      0     0      1 0x00100000
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.030000] Stack : 
00000000 00000001 7fabc3c8 00000000 00000000 780022c0 804572a4 80400000
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.030000] 	  8040675c 
00000001 00000001 80406680 80406724 80400000 00000000 8001346c
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.030000] 	  1100fc03 
00000003 87c74000 87c75ec0 80400000 8005dbf8 1100fc03 00000003
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.030000] 	  00000000 
80400000 804572a4 8005dbf0 80400000 8001abd8 1100fc03 00000000
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.030000] 	  00000004 
804064a0 000000a0 8001abe0 a0080040 50204041 0353017a 04405c16
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.030000] 	  ...
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.100000] Call 
Trace:[<8001346c>] 0x8001346c
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.110000] [<8005dbf8>] 
0x8005dbf8
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.120000] [<8005dbf0>] 
0x8005dbf0
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.120000] [<8001abd8>] 
0x8001abd8
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.130000] [<8001abe0>] 
0x8001abe0
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.140000] [<80214444>] 
0x80214444
Sat Feb 25 20:10:09 2017 kern.warn kernel: [ 3041.150000]
Sat Feb 25 20:10:09 2017 kern.err kernel: [ 3041.150000] rcu_sched 
kthread starved for 6019 jiffies! g4116 c4115 f0x0 s3 ->state=0x1

Any ideas what I should be looking for?

Other stuff (ar71xx and x86/64 namely) are still up (uninterrupted 
since their last flash to a firmware with a 4.4.51 kernel) and I 
haven't gotten any complaints from their users.

Stijn