Re: [Xen-users] XEN-4.4 BUG: Kernel paging request

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Sat, May 14, 2016 at 06:23:06PM +0200, Wolf Grossi wrote:
> Greetings!
> 
> This are 2 XEN-4.4.4_02-43.1, MAGRO-XEN and MAGRO-XEN1, each running on
> opensuse-13.2.
> Both machines are configured identically, MAGRO-XEN1 is used as backup.
> 
> Since changing to opensuse-13.2/XEN-4.4 I get dom0 hangs on MAGRO-XEN,
> sometimes after 3, sometimes after 10 days.
> 
> Today I checked net performance.
> 
> On MAGRO-XEN dom0 I run iperf(client) to MAGRO-XEN1 dom0 iperf(server).
> The machines are connected with a 1GBit line and I saw values as
> expected. Everything was ok.
> 
> 
> Then I started iperf(server) on MAGRO-XEN1 domU MAGRO8 and iperf(client)
> on MAGRO-XEN1 dom0.
> 
> Only after a few messages the system hung!
> 
> This error is repeatable on both machines!
> 
> Below is the logfile (journalctl -f) showing the BUG, and MAGRO8.xml
> 
> What can I do to solve the issue?
> 
> 
> Any hints would be very much appreciated.
> 
> Wolf
> 
> 
> 
> --- logfile ---
> May 14 17:15:01 MAGRO-XEN1 systemd[1]: Starting Session 23 of user root.
> May 14 17:15:01 MAGRO-XEN1 systemd[1]: Started Session 23 of user root.
> May 14 17:26:51 MAGRO-XEN1 kernel: BUG: unable to handle kernel paging
> request at ffffc9000413f022
> May 14 17:26:51 MAGRO-XEN1 kernel: IP: [<ffffffffa0473b2b>]
> netbk_gop_frag+0x24b/0x2a0 [netbk]
> May 14 17:26:52 MAGRO-XEN1 kernel: PGD 16604c067 PUD 16604d067 PMD
> 166387067 PTE 0

This is clearly a kernel bug.

> May 14 17:26:52 MAGRO-XEN1 kernel: Oops: 0002 [#1] SMP
> May 14 17:26:52 MAGRO-XEN1 kernel: Modules linked in: binfmt_misc fuse
> bnep bluetooth 6lowpan_iphc rfkill xt_pkttype xt_physdev xt_TCPMSS
> xt_LOG xt_limit af_packet bridge stp llc iscsi_ibft iscsi_boot_sysfs nbd
> xenblk ip6t_REJECT xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6
> ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle
> blktap nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4
> blktap2 nf_defrag_ipv4 ip_tables pciback xt_conntrack nf_conntrack usbbk
> ip6table_filter ip6_tables x_tables xen_scsibk blkbk blkback_pagemap
> netbk xenbus_be gntdev evtchn hid_generic usbhid ppdev
> snd_hda_codec_hdmi gpio_ich iTCO_wdt iTCO_vendor_support 8250
> snd_hda_intel serial_core snd_hda_controller snd_hda_codec parport_pc
> parport snd_hwdep snd_pcm snd_timer snd soundcore processor serio_raw
> 8139too 8139cp
> May 14 17:26:52 MAGRO-XEN1 kernel:  r8169 i2c_i801 mii thermal_sys
> lpc_ich mfd_core pcspkr shpchp button coretemp domctl sr_mod cdrom
> ata_generic ata_piix firewire_ohci ehci_pci radeon uhci_hcd pata_via
> ehci_hcd hwmon i2c_algo_bit firewire_core drm_kms_helper crc_itu_t ttm
> drm i2c_core usbcore usb_common dm_mirror dm_region_hash dm_log dm_mod sg
> May 14 17:26:52 MAGRO-XEN1 kernel: CPU: 1 PID: 971 Comm: netback/0 Not
> tainted 3.16.7-35-xen #1
> May 14 17:26:52 MAGRO-XEN1 kernel: Hardware name: To Be Filled By O.E.M.
> To Be Filled By O.E.M./P5B-DE, BIOS P1.10 11/04/2009
> May 14 17:26:52 MAGRO-XEN1 kernel: task: ffff8800fe418650 ti:
> ffff8800f48a0000 task.ti: ffff8800f48a0000
> May 14 17:26:52 MAGRO-XEN1 kernel: RIP: e030:[<ffffffffa0473b2b>]
> [<ffffffffa0473b2b>] netbk_gop_frag+0x24b/0x2a0 [netbk]

This suggests a bug in kernel netback driver.

I suggest you take this to OpenSUSE kernel developers -- assuming you
got your dom0 kernel from them.

Wei.

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