Bug#631945: linux-image-2.6.39-2-amd64: HFSC puts lots of "WARNING: at .../sch_hfsc.c:1427 hfsc_dequeue+0x155/0x28b [sch_hfsc]()" in dmesg
It seems that downgrading kernel to 2.6.32 from squeeze resolves the issue (no more warnings, and filtering/shaping work as expected). But, the problem might go deeper because when I've been digging some lists and forums if anyone faced similar problem and I've found someone got very much the same warning using HTB in kernel 2.6.26.6. This could be helpful, but I don't know if I can/should post this to netdev list, so if this is the right thing to do, please, somebody forward this :-)
This is the link (polish):
http://forum.dug.net.pl/viewtopic.php?pid=112061#p112061
He uses imq (patched kernel by himself), esfq, l7 and ipmark. So this is pretty much not the same stuff as in my configuration. However symptoms are the same (he claims warnings apear once a second but it can be proportional to traffic passing through the machine). Also this is DUG forum (Debian Users Gang) so I conclude he uses self-compiled debian kernel, but man can't be sure. :-)
Here's his kernel log in casse the link was dead:
Feb 24 20:53:10 cerber kernel: ------------[ cut here ]------------
Feb 24 20:53:10 cerber kernel: WARNING: at net/sched/sch_htb.c:361 htb_dequeue+0x131/0x31d()
Feb 24 20:53:10 cerber kernel: Modules linked in: xt_connmark nf_nat_h323 nf_conntrack_h323 nf_nat_sip nf_conntrack_sip xt_d$
Feb 24 20:53:10 cerber kernel: Pid: 0, comm: swapper Tainted: G W 2.6.26.6-cerber #4
Feb 24 20:53:10 cerber kernel:
Feb 24 20:53:10 cerber kernel: Call Trace:
Feb 24 20:53:10 cerber kernel: <IRQ> [<ffffffff802309f8>] warn_on_slowpath+0x51/0x8c
Feb 24 20:53:10 cerber kernel: [<ffffffff803fabc7>] __qdisc_run+0x8c/0x205
Feb 24 20:53:10 cerber kernel: [<ffffffff804265d7>] ip_finish_output+0x0/0x2ab
Feb 24 20:53:10 cerber kernel: [<ffffffff80211d7c>] read_tsc+0x9/0x1f
Feb 24 20:53:10 cerber kernel: [<ffffffff80248b74>] getnstimeofday+0x40/0xad
Feb 24 20:53:10 cerber kernel: [<ffffffff8024748e>] ktime_get_ts+0x28/0x56
Feb 24 20:53:10 cerber kernel: [<ffffffff802474c8>] ktime_get+0xc/0x64
Feb 24 20:53:10 cerber kernel: [<ffffffff80402784>] htb_dequeue+0x131/0x31d
Feb 24 20:53:10 cerber kernel: [<ffffffff803facfe>] __qdisc_run+0x1c3/0x205
Feb 24 20:53:10 cerber kernel: [<ffffffff803ead15>] net_tx_action+0xe1/0x109
Feb 24 20:53:10 cerber kernel: [<ffffffff8023645a>] __do_softirq+0x69/0xd7
Feb 24 20:53:10 cerber kernel: [<ffffffff8020c66c>] call_softirq+0x1c/0x30
Feb 24 20:53:10 cerber kernel: [<ffffffff8020e220>] do_softirq+0x30/0x6b
Feb 24 20:53:10 cerber kernel: [<ffffffff8020e453>] do_IRQ+0x73/0xd0
Feb 24 20:53:10 cerber kernel: [<ffffffff80212354>] mwait_idle+0x0/0x3f
Feb 24 20:53:10 cerber kernel: [<ffffffff8020b9f1>] ret_from_intr+0x0/0xa
Feb 24 20:53:10 cerber kernel: <EOI> [<ffffffff802093e0>] default_idle+0x0/0x3b
Feb 24 20:53:10 cerber kernel: [<ffffffff8042b101>] tcp_poll+0x0/0x131
Feb 24 20:53:10 cerber kernel: [<ffffffff80212390>] mwait_idle+0x3c/0x3f
Feb 24 20:53:10 cerber kernel: [<ffffffff8020a51a>] cpu_idle+0x5d/0xb8
Feb 24 20:53:10 cerber kernel:
Feb 24 20:53:10 cerber kernel: ---[ end trace 43d0351cdc38f35a ]---
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