Here is an update to the previous described problem which happens only
with AR9xxx
[12891.19] net_ratelimit: 23 callbacks suppressed
[12896.20] net_ratelimit: 4608 callbacks suppressed
[46741.06] net_ratelimit: 3 callbacks suppressed
It seems to be iptables related. When adding to /etc/sysctl.conf the
following:
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_synack_retries = 3
The router does not freeze anymore.
Some research:
http://www.evanjones.ca/tcp-stuck-connection-mystery.html
http://zszsit.blogspot.ca/2012/10/ratelimit-callbacks-suppressed.html
http://www.gargoyle-router.com/phpbb/viewtopic.php?f=3t=3203start=20#p14512
On 11/07/2013 10:44 PM, cmsv wrote:
AA DISTRIB_REVISION=r38621
In the past few days i may have stumble on a possible kernel bug that
has effect on AR9xxx
From all routers that i have been using to test the compiled images
only 3 fully works apparently without problems while the others end
up by freezing after some time. The difference between the working ones
and the malfunctioning ones is the chip.
Routers affected :
DIR-615-C1 (Atheros AR9130) and TL-WR841N 8.3 (AR9341 SoC)
Router NOT affected:
Dir 601 A1 (Atheros AR7240 rev 2)
Dir 615 E1 ((Atheros AR7240)
Dir 615 E3 ((Atheros AR7240)
Tp-link tl wr703
The only errors i can obtain from any logs before i completely lose
serial console access and the router freezes are:
395.83] SysRq : HELP : loglevel(0-9) reBoot Crash
terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I)
thaw-filesystems(J) show-memory-usage(M) nice-all-RT-tasks(N) powerOff
show-registers(P) show-all-timers(Q) Sync show-task-states(T) Unmount
show-blocked-tasks(W)
[ 395.86] SysRq : Show Regs
[ 395.86] Cpu 0
[ 395.86] $ 0 : 8032 80063340 802c8000
[ 395.86] $ 4 : 1000f400 00fe
[ 395.86] $ 8 : f400 81ab
[ 395.86] $12 : 80e3a1e4 0001 0001 0047
[ 395.86] $16 : 8032 8032 8031 80311ca1
[ 395.86] $20 : 802d 81ff
[ 395.86] $24 : 004764b8 80095220
[ 395.86] $28 : 802c8000 802c9ed0 81ff 80064ba8
[ 395.86] Hi: 005c
[ 395.86] Lo: 2b183d00
[ 395.86] epc : 80063360 0x80063360
[ 395.86] Tainted: G O
[ 395.86] ra: 80064ba8 0x80064ba8
[ 395.86] Status: 1000f403KERNEL EXL IE
[ 395.86] Cause : 00804000
[ 395.86] PrId : 00019374 (MIPS 24Kc)
[ 396.08] SysRq : HELP : loglevel(0-9) reBoot Crash
terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I)
thaw-filesystems(J) show-memory-usage(M) nice-all-RT-tasks(N) powerOff
show-registers(P) show-all-timers(Q) Sync show-task-states(T) Unmount
show-blocked-tasks(W)
DISTRIB_REVISION=r38863 which applied
target/linux/generic/patches-3.3/890-8250_optional_sysrq.patch seems to
resolve this issue.
Related links:
https://bugzilla.kernel.org/show_bug.cgi?id=47741
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/984273
Just like this one:
https://forums.gentoo.org/viewtopic-t-801565-view-previous.html?sid=cf2b78f9e57bf60c9e80057332a367ad
Also get these:
[12891.19] net_ratelimit: 23 callbacks suppressed
[12896.20] net_ratelimit: 4608 callbacks suppressed
[46741.06] net_ratelimit: 3 callbacks suppressed
I am willing to test patches and or fixes for this issue if anyone has
any feedback regarding this problem.
I was not able to find much helpful information about it.
I would also like to know if anyone else is using the same AA revision
(or close) with the same atheros chip and gets the same problem.
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