Here is an update to the previous described problem which happens only with AR9xxx
> [12891.190000] net_ratelimit: 23 callbacks suppressed > [12896.200000] net_ratelimit: 4608 callbacks suppressed > [46741.060000] 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=3&t=3203&start=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: > > 395.830000] 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) > [ 395.860000] SysRq : Show Regs > [ 395.860000] Cpu 0 > [ 395.860000] $ 0 : 00000000 80320000 80063340 802c8000 > [ 395.860000] $ 4 : 00000000 00000000 1000f400 ffff00fe > [ 395.860000] $ 8 : 00000000 0000f400 00000000 81ab0000 > [ 395.860000] $12 : 80e3a1e4 00000001 00010000 00470000 > [ 395.860000] $16 : 80320000 80320000 80310000 80311ca1 > [ 395.860000] $20 : 802d0000 00000000 81ff0000 00000000 > [ 395.860000] $24 : 004764b8 80095220 > [ 395.860000] $28 : 802c8000 802c9ed0 81ff0000 80064ba8 > [ 395.860000] Hi : 0000005c > [ 395.860000] Lo : 2b183d00 > [ 395.860000] epc : 80063360 0x80063360 > [ 395.860000] Tainted: G O > [ 395.860000] ra : 80064ba8 0x80064ba8 > [ 395.860000] Status: 1000f403 KERNEL EXL IE > [ 395.860000] Cause : 00804000 > [ 395.860000] PrId : 00019374 (MIPS 24Kc) > [ 396.080000] 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: > > [12891.190000] net_ratelimit: 23 callbacks suppressed > [12896.200000] net_ratelimit: 4608 callbacks suppressed > [46741.060000] 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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