Re: [Xen-users] kernel BUG at /usr/src/linux-stable/drivers/net/xen-netback/netback.c:540!

[Hans de Bruin <jmdebruin@xxxxxxxxx>]

On 12/17/2014 11:06 PM, Hans de Bruin wrote:
> Hi
>
> I just opgraded my test-host and guest to 3.14.27. Which probable was
> not a good idea. A nfsroot guest triggers a kernel BUG in the host when
> is starts its mediatomb deamon. Before the upgrade the host and guest
> were running 3.14.23:

After some testing it looks like the guest is to blame, It does not 
matter if the host is running .23 or .27, but if the guest boots .27 the 
BUG happens and always when mediatomb is starting.
The above is after start-up of the host and the first boot of the guest. 
When a .23 guest is successfully started, it can be shut down and 
restarted with a .27 kernel.
Is there anything I should test or check before I start mailing to the 
dev-list?
--
Hans


> [   87.011325] ------------[ cut here ]------------
> [   87.011350] kernel BUG at
> /usr/src/linux-stable/drivers/net/xen-netback/netback.c:540!
> [   87.011386] invalid opcode: 0000 [#1] SMP
> [   87.011397] Modules linked in: xt_physdev xen_pciback xen_gntalloc
> xen_gntdev xt_multiport nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter
> ip6_tables xt_nat xt_conntrack xt_tcpudp xt_LOG iptable_nat
> nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack
> iptable_filter ip_tables x_tables bridge stp llc ipv6 lp fuse i915 video
> r8169 8139too drm_kms_helper coretemp i2c_dev evdev intel_agp gpio_ich
> i2c_i801 mii processor ppdev drm intel_gtt agpgart lpc_ich
> snd_hda_codec_realtek snd_hda_codec_generic uhci_hcd ehci_pci ehci_hcd
> thermal_sys microcode snd_hda_intel i2c_algo_bit snd_hda_codec snd_hwdep
> i2c_core snd_pcm snd_timer snd soundcore parport_pc parport hwmon button
> loop
> [   87.011550] CPU: 1 PID: 1221 Comm: vif1.0 Not tainted 3.14.27 #8
> [   87.011560] Hardware name: To Be Filled By O.E.M. To Be Filled By
> O.E.M./To be filled by O.E.M., BIOS 080015  03/19/2010
> [   87.011574] task: ffff8800701c1060 ti: ffff88005d1be000 task.ti:
> ffff88005d1be000
> [   87.011584] RIP: e030:[<ffffffff81a60df8>]  [<ffffffff81a60df8>]
> xenvif_rx_action+0x888/0x890
> [   87.011606] RSP: e02b:ffff88005d1bfdb8  EFLAGS: 00010297
> [   87.011615] RAX: 0000000000000001 RBX: ffff88005d1bfdec RCX:
> 3fffffffffffff00
> [   87.011625] RDX: 0000000000000013 RSI: ffff8800574b5ee8 RDI:
> 00000000000b195f
> [   87.011635] RBP: ffff88005d1bfe68 R08: ffff88005d1bfdec R09:
> 0000000000000001
> [   87.011645] R10: ffff88005ccd0840 R11: ffff88005ccd7498 R12:
> 0000000000016f8b
> [   87.011654] R13: ffff88005ccd0840 R14: ffff8800574b5ee8 R15:
> ffff88005ccd0840
> [   87.011672] FS:  00007fe579d85900(0000) GS:ffff88007f280000(0000)
> knlGS:0000000000000000
> [   87.011683] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
> [   87.011692] CR2: 00007f4442b3e000 CR3: 000000005d127000 CR4:
> 0000000000000660
> [   87.011703] Stack:
> [   87.011709]  ffff88005d1bfdec ffff88005ccd7360 00016f8b7f292d40
> ffff88005ccd0840
> [   87.011724]  ffff88005ccd0840 0000001200000000 0000000075d2fb80
> ffff88005d1bfdf0
> [   87.011739]  ffff88005d1bfdf0 ffff88005d1bfe00 ffff88005d1bfe00
> 0000000000000000
> [   87.011754] Call Trace:
> [   87.011768]  [<ffffffff81a61874>] xenvif_kthread+0xa4/0x230
> [   87.011782]  [<ffffffff810d26d0>] ? prepare_to_wait_event+0x100/0x100
> [   87.011796]  [<ffffffff81a617d0>] ? xenvif_stop_queue+0x60/0x60
> [   87.011809]  [<ffffffff810b1f82>] kthread+0xd2/0xf0
> [   87.011821]  [<ffffffff810b1eb0>] ? kthread_create_on_node+0x180/0x180
> [   87.011835]  [<ffffffff81c46dfc>] ret_from_fork+0x7c/0xb0
> [   87.011847]  [<ffffffff810b1eb0>] ? kthread_create_on_node+0x180/0x180
> [   87.011856] Code: 00 e9 57 fa ff ff c6 85 7c ff ff ff 00 e9 24 fc ff
> ff 83 c8 03 e9 aa fd ff ff 45 31 c0 b8 04 00 00 00 e9 82 fd ff ff 0f 0b
> 0f 0b <0f> 0b 66 0f 1f 44 00 00 0f 1f 44 00 00 48 8b 97 18 6b 00 00 55
> [   87.011974] RIP  [<ffffffff81a60df8>] xenvif_rx_action+0x888/0x890
> [   87.011988]  RSP <ffff88005d1bfdb8>
> [   87.011997] ---[ end trace 3690b03a5c0d0712 ]---
>
>
> root@sol(test):/usr/src/linux-stable# xl info
> host                   : sol
> release                : 3.14.27
> version                : #8 SMP Wed Dec 17 14:40:03 CET 2014
> machine                : x86_64
> nr_cpus                : 4
> max_cpu_id             : 3
> nr_nodes               : 1
> cores_per_socket       : 2
> threads_per_core       : 2
> cpu_mhz                : 1666
> hw_caps                :
> bfebfbff:20100800:00000000:00000900:0040e31d:00000000:00000001:00000000
> virt_caps              :
> total_memory           : 4086
> free_memory            : 1476
> sharing_freed_memory   : 0
> sharing_used_memory    : 0
> outstanding_claims     : 0
> free_cpus              : 0
> xen_major              : 4
> xen_minor              : 3
> xen_extra              : .3
> xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p
> xen_scheduler          : credit
> xen_pagesize           : 4096
> platform_params        : virt_start=0xffff800000000000
> xen_changeset          :
> xen_commandline        : dom0_mem=2G dom0_max_vcpus=4 loglvl=all
> guest_loglvl=all com1=115200,8n1 console=com1,vga
> cc_compiler            : gcc (GCC) 4.8.2
> cc_compile_by          : root
> cc_compile_domain      : system
> cc_compile_date        : Sat Nov 15 17:54:36 CET 2014
> xend_config_format     : 4
> root@sol(test):/usr/src/linux-stable#

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