[Xen-devel] Network dies and kernel errors

John McMonagle
Mon, 25 Jul 2011 19:18:21 -0000

Have a new amd 6100 based server.
http://www.supermicro.com/Aplus/system/2U/2022/AS-2022G-URF.cfm
Running debian squeeze with debian 2.6.32 xen kernel
Running xen 4.1.1 built from source from xen.org

I''m seeing 2 errors.
during boot get this:

[    0.004823] ------------[ cut here ]------------
[    0.004833] WARNING:
at
/build/buildd-linux-2.6_2.6.32-35-amd64-aZSlKL/linux-2.6-2.6.32/debian/build/source_amd64_xen/arch/x86/xen/enlighten.c:726
init_hw_perf_events+0x32d/0x3cd()
[    0.004838] Hardware name: H8DGU
[    0.004841] Modules linked in:
[    0.004847] Pid: 0, comm: swapper Not tainted 2.6.32-5-xen-amd64 #1
[    0.004850] Call Trace:
[    0.004857]  [<ffffffff81510efc>] ? init_hw_perf_events+0x32d/0x3cd
[    0.004862]  [<ffffffff81510efc>] ? init_hw_perf_events+0x32d/0x3cd
[    0.004870]  [<ffffffff8104ef00>] ? warn_slowpath_common+0x77/0xa3
[    0.004875]  [<ffffffff81510efc>] ? init_hw_perf_events+0x32d/0x3cd
[    0.004881]  [<ffffffff813044dc>] ? identify_cpu+0x2f7/0x300
[    0.004888]  [<ffffffff8100eccf>] ? xen_restore_fl_direct_end+0x0/0x1
[    0.004895]  [<ffffffff810e81d5>] ? kmem_cache_alloc+0x8c/0xf0
[    0.004900]  [<ffffffff81510a16>] ? identify_boot_cpu+0x15/0x3e
[    0.004904]  [<ffffffff81510baa>] ? check_bugs+0x9/0x2e
[    0.004910]  [<ffffffff81509cce>] ? start_kernel+0x3cd/0x3e8
[    0.004915]  [<ffffffff8150bc93>] ? xen_start_kernel+0x586/0x58a
[    0.004926] ---[ end trace a7919e7f17c0a725 ]---
[    0.004930] ... version:                0
[    0.004932] ... bit width:              48
[    0.004935] ... generic registers:      4
[    0.004938] ... value mask:             0000ffffffffffff
[    0.004940] ... max period:             00007fffffffffff
[    0.004943] ... fixed-purpose events:   0
[    0.004946] ... event mask:             000000000000000f

Concerning the enlighten.c error. While it does not seem to cause problems it
concerns me  power management may be it''s the real cause  network
problems
that are getting my attention.

I got the debian kernel source and line 726 is the line with the *****

static void xen_clts(void)
{
        struct multicall_space mcs;  *****

        mcs = xen_mc_entry(0);

        MULTI_fpu_taskswitch(mcs.mc, 0);

        xen_mc_issue(PARAVIRT_LAZY_CPU);
}

Means nothing to me :-(

What is it?
What can be done?

Then next one may not be xen but I only had the problem after running a domu.
After a while I get kernel error and networking stops.
This is the error:
[ 1411.813376] ------------[ cut here ]------------
[ 1411.813398] WARNING:
at
/build/buildd-linux-2.6_2.6.32-35-amd64-aZSlKL/linux-2.6-2.6.32/debian/build/source_amd64_xen/net/sched/s
ch_generic.c:261 dev_watchdog+0xe2/0x194()
[ 1411.813410] Hardware name: H8DGU
[ 1411.813417] NETDEV WATCHDOG: peth0 (igb): transmit queue 1 timed out
[ 1411.813424] Modules linked in: xt_physdev iptable_filter tun ip_tables
x_tables bridge stp sg sr_mod cdrom xfs exportfs ipmi_si i
pmi_devintf ipmi_watchdog ipmi_msghandler xen_evtchn blktap xenfs loop snd_pcm
snd_timer snd soundcore snd_page_alloc pcspkr psmouse joydev evdev serio_raw
i2c_piix
4 edac_core k10temp edac_mce_amd i2c_core processor button acpi_processor ext4
mbcache jbd2 crc16 usbhid hid dm_mod raid1 md_mod sd_mod crc_t10dif
ata_generic usb_s
torage pata_atiixp ahci ohci_hcd libata ehci_hcd usbcore nls_base scsi_mod igb
dca thermal thermal_sys [last unloaded: scsi_wait_scan]
 [ 1411.813656] Pid: 4, comm: ksoftirqd/0 Tainted: G        W
2.6.32-5-xen-amd64 #1
[ 1411.813664] Call Trace:
[ 1411.813671]  <IRQ>  [<ffffffff81272e42>] ?
dev_watchdog+0xe2/0x194
[ 1411.813697]  [<ffffffff81272e42>] ? dev_watchdog+0xe2/0x194
[ 1411.813711]  [<ffffffff8104ef00>] ? warn_slowpath_common+0x77/0xa3
[ 1411.813724]  [<ffffffff81272d60>] ? dev_watchdog+0x0/0x194
[ 1411.813736]  [<ffffffff8104ef88>] ? warn_slowpath_fmt+0x51/0x59
[ 1411.813751]  [<ffffffff8130d42a>] ? _spin_unlock_irqrestore+0xd/0xe
[ 1411.813762]  [<ffffffff8104b41e>] ? try_to_wake_up+0x289/0x29b
[ 1411.813778]  [<ffffffff81272d34>] ? netif_tx_lock+0x3d/0x69
[ 1411.813791]  [<ffffffff8125d7da>] ? netdev_drivername+0x3b/0x40
[ 1411.813803]  [<ffffffff81272e42>] ? dev_watchdog+0xe2/0x194
[ 1411.813816]  [<ffffffff8100ece2>] ? check_events+0x12/0x20
[ 1411.813827]  [<ffffffff81040e42>] ? check_preempt_wakeup+0x0/0x268
[ 1411.813841]  [<ffffffff8105b5ef>] ? run_timer_softirq+0x1c9/0x268
[ 1411.813855]  [<ffffffff81054c9b>] ? __do_softirq+0xdd/0x1a6
[ 1411.813867]  [<ffffffff81012cac>] ? call_softirq+0x1c/0x30
[ 1411.813873]  <EOI>  [<ffffffff8101422b>] ? do_softirq+0x3f/0x7c
[ 1411.813893]  [<ffffffff810548c2>] ? ksoftirqd+0x5f/0xd3
[ 1411.813905]  [<ffffffff81054863>] ? ksoftirqd+0x0/0xd3
[ 1411.813915]  [<ffffffff81065c39>] ? kthread+0x79/0x81
[ 1411.813926]  [<ffffffff81012baa>] ? child_rip+0xa/0x20
[ 1411.813937]  [<ffffffff81011d61>] ? int_ret_from_sys_call+0x7/0x1b
[ 1411.813948]  [<ffffffff8101251d>] ? retint_restore_args+0x5/0x6
[ 1411.813958]  [<ffffffff81012ba0>] ? child_rip+0x0/0x20
[ 1411.813966] ---[ end trace a7919e7f17c0a727 ]---
[ 1412.052253] eth0: port 1(peth0) entering disabled state
[ 1635.796207] frontend_changed: backend/vbd/3/768: prepare for reconnect
[ 1647.137513] eth0: port 3(vif3.0) entering disabled state
[ 1647.157527] eth0: port 3(vif3.0) entering disabled state
 Kernel logging (proc) stopped.

In this case dom0 locked up. Some times just networking stops and some times
networking recovers.

Looks like it uses msi-x interrupts.

Concerning igb error I have tried the following  one at a time:
New igb driver from Intel site.
kernel parameter  pcie_aspm=off
ethtool -K eth0 tx off  on dom0
ethtool -K eth0 gro off  on dom0

It has never died doing iperf from dom0 or domu  <> external.
Never died during network backup.

Usually takes a least a few hours and has never made it a day running a domu.
Wish I could get it to die faster :-)
Any ideas?
I''m pretty much down to trying different network cards

Any ideas?

John