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Bug#812746: linux-image-4.3.0-0.bpo.1-amd64: r8169 suspend to ram regression: rtl_counters_cond == 1

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  Bug#812746: linux-image-4.3.0-0.bpo.1-amd64: r8169 suspend to ram regression: rtl_counters_cond == 1 Jens Thiele <karme@karme.de> - 2016-01-26 10:20 +0100
    Bug#812746: linux-image-4.3.0-0.bpo.1-amd64: r8169 misbehaves if shut down Jens Thiele <karme@karme.de> - 2016-01-26 11:10 +0100

#52448 — Bug#812746: linux-image-4.3.0-0.bpo.1-amd64: r8169 suspend to ram regression: rtl_counters_cond == 1

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Package: src:linux
Version: 4.3.3-7~bpo8+1
Severity: normal

Dear Maintainer,

after suspend to ram there are lots of error messages from the r8169
module and there are some strange side-effects (multiload_applet
produces 100% cpu load trying to read network interface statistics ...)

as workaround one can ifdown eth0 ; ifup eth0

This did not happen with debian kernels 3.16 and 4.2

-- Package-specific info:

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#52451 — Bug#812746: linux-image-4.3.0-0.bpo.1-amd64: r8169 misbehaves if shut down

looks like this is in fact somehow related to laptop-mode-tools / r8169
misbehaves if shut down.

In the end it is enough to shut down the interface via:
ip link set dev eth0 down
to produce the errors messages:
[90830.764253] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90830.840253] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90830.915939] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90830.991631] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90831.068731] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90831.135730] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90831.211712] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90831.286904] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90831.459953] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90831.535702] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
[90831.611131] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
...

but in this case the errors stop if one brings up the interface again
via:
ip link set dev eth0 up
Jan 26 11:02:00 amalthea kernel: [90937.282145] r8169 0000:02:00.0 eth0: rtl_counters_cond == 1 (loop: 1000, delay: 10).
Jan 26 11:02:00 amalthea avahi-daemon[2719]: Joining mDNS multicast group on interface eth0.IPv4 with address 192.168.5.2.
Jan 26 11:02:00 amalthea kernel: [90937.349408] r8169 0000:02:00.0 eth0: link down
Jan 26 11:02:00 amalthea kernel: [90937.350428] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
Jan 26 11:02:00 amalthea avahi-daemon[2719]: New relevant interface eth0.IPv4 for mDNS.
Jan 26 11:02:00 amalthea avahi-daemon[2719]: Registering new address record for 192.168.5.2 on eth0.IPv4.
Jan 26 11:02:01 amalthea ntpd[2861]: Listen normally on 61 eth0 192.168.5.2 UDP 123
Jan 26 11:02:01 amalthea ntpd[2861]: peers refreshed

don't know what exactly happens in the suspend case but maybe the
interface is shut down and never brought back up again because no cable
is connected

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