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jserink
l33t
l33t


Joined: 30 Jan 2004
Posts: 933

PostPosted: Wed Apr 15, 2015 1:44 pm    Post subject: syslog is flooded when ppp0 comes up Reply with quote

Hi All:

I am running this:
jserinki7 jserink # uname -a
Linux jserinki7 3.18.11-gentoo #1 SMP PREEMPT Sat Apr 11 22:35:39 SGT 2015 x86_64 Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz GenuineIntel GNU/Linux
jserinki7 jserink # equery list ppp
* Searching for ppp ...
[IP-] [ ] net-dialup/ppp-2.4.7:0/2.4.7
jserinki7 jserink # equery list xl2tpd
* Searching for xl2tpd ...
[IP-] [ ] net-dialup/xl2tpd-1.3.1-r4:0
jserinki7 jserink # equery list libreswan
* Searching for libreswan ...
[IP-] [ ] net-misc/libreswan-3.10:0

I just got a Windoze 2008R2 test server up in our lab and got my connection to it up and by syslog was completely flooded with....'junk' with this message:
Apr 15 21:22:02 [kernel] [ 1327.801733] ppp0: hw csum failure
Apr 15 21:22:02 [kernel] [ 1327.801748] CPU: 0 PID: 2879 Comm: irq/37-iwlwifi Not tainted 3.18.11-gentoo #1
Apr 15 21:22:02 [kernel] [ 1327.801752] Hardware name: Dell Inc. Precision M4600/08V9YG, BIOS A08 10/18/2011
Apr 15 21:22:02 [kernel] [ 1327.801757] 0000000000000000 ffff88082dc03c18 ffffffff81614ef1 0000000000000102
Apr 15 21:22:02 [kernel] [ 1327.801767] ffff8808002d4000 ffff88082dc03c38 ffffffff815259cd ffffffff81515c00
Apr 15 21:22:02 [kernel] [ 1327.801774] ffff8807c1307300 ffff88082dc03c78 ffffffff8151d597 0000000000000000
Apr 15 21:22:02 [kernel] [ 1327.801782] Call Trace:
Apr 15 21:22:02 [kernel] [ 1327.801786] <IRQ> [<ffffffff81614ef1>] dump_stack+0x4f/0x7c
Apr 15 21:22:02 [kernel] [ 1327.801812] [<ffffffff815259cd>] netdev_rx_csum_fault+0x3d/0x40
Apr 15 21:22:02 [kernel] [ 1327.801820] [<ffffffff81515c00>] ? skb_push+0x40/0x40
Apr 15 21:22:02 [kernel] [ 1327.801828] [<ffffffff8151d597>] __skb_checksum_complete+0xb7/0xc0
Apr 15 21:22:02 [kernel] [ 1327.801839] [<ffffffff81585449>] tcp_v4_rcv+0x119/0x9f0
Apr 15 21:22:02 [kernel] [ 1327.801849] [<ffffffff8156020c>] ip_local_deliver_finish+0xac/0x250
Apr 15 21:22:02 [kernel] [ 1327.801856] [<ffffffff81560570>] ip_local_deliver+0x80/0x90
Apr 15 21:22:02 [kernel] [ 1327.801863] [<ffffffff8155fe10>] ip_rcv_finish+0x80/0x3d0
Apr 15 21:22:02 [kernel] [ 1327.801870] [<ffffffff81560857>] ip_rcv+0x2d7/0x420
Apr 15 21:22:02 [kernel] [ 1327.801879] [<ffffffff81528472>] __netif_receive_skb_core+0x522/0x7f0
Apr 15 21:22:02 [kernel] [ 1327.801891] [<ffffffff81073e98>] ? ttwu_do_activate.constprop.101+0x58/0x60
Apr 15 21:22:02 [kernel] [ 1327.801898] [<ffffffff81528758>] __netif_receive_skb+0x18/0x60
Apr 15 21:22:02 [kernel] [ 1327.801906] [<ffffffff815293e6>] process_backlog+0x96/0x170
Apr 15 21:22:02 [kernel] [ 1327.801913] [<ffffffff81528bca>] net_rx_action+0x14a/0x270
Apr 15 21:22:02 [kernel] [ 1327.801923] [<ffffffff8105320a>] __do_softirq+0xfa/0x2d0
Apr 15 21:22:02 [kernel] [ 1327.801934] [<ffffffff8161d52c>] do_softirq_own_stack+0x1c/0x30
Apr 15 21:22:02 [kernel] [ 1327.801937] <EOI> [<ffffffff81053485>] do_softirq+0x55/0x60
Apr 15 21:22:02 [kernel] [ 1327.801951] [<ffffffff8105352b>] __local_bh_enable_ip+0x9b/0xb0
Apr 15 21:22:02 [kernel] [ 1327.802007] [<ffffffffa03c5a0f>] iwl_pcie_irq_handler+0x5ef/0xb50 [iwlwifi]
Apr 15 21:22:02 [kernel] [ 1327.802019] [<ffffffff8109b6d0>] ? irq_finalize_oneshot.part.30+0xe0/0xe0
Apr 15 21:22:02 [kernel] [ 1327.802026] [<ffffffff8109b6eb>] irq_thread_fn+0x1b/0x40
Apr 15 21:22:02 [kernel] [ 1327.802034] [<ffffffff8109b6d0>] ? irq_finalize_oneshot.part.30+0xe0/0xe0
Apr 15 21:22:02 [kernel] [ 1327.802042] [<ffffffff8109bc07>] irq_thread+0x117/0x140
Apr 15 21:22:02 [kernel] [ 1327.802049] [<ffffffff8109b7a0>] ? wake_threads_waitq+0x30/0x30
Apr 15 21:22:02 [kernel] [ 1327.802057] [<ffffffff8109baf0>] ? irq_thread_check_affinity+0x70/0x70
Apr 15 21:22:02 [kernel] [ 1327.802067] [<ffffffff8106acd4>] kthread+0xc4/0xe0
Apr 15 21:22:02 [kernel] [ 1327.802078] [<ffffffff81610000>] ? alloc_system_vector+0x1b/0x32
Apr 15 21:22:02 [kernel] [ 1327.802087] [<ffffffff8106ac10>] ? kthread_create_on_node+0x180/0x180
Apr 15 21:22:02 [kernel] [ 1327.802095] [<ffffffff8161b998>] ret_from_fork+0x58/0x90
Apr 15 21:22:02 [kernel] [ 1327.802103] [<ffffffff8106ac10>] ? kthread_create_on_node+0x180/0x180

it repeats for every packet going through ppp0.
It exactly this same as these:
https://lkml.org/lkml/2015/2/16/472
https://bugzilla.redhat.com/show_bug.cgi?id=1148612
https://bugzilla.kernel.org/show_bug.cgi?id=95171

Is there any news of a possible fix for this?

Cheers,
john
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