Re: [linux-arm-xen test] 58849: regressions - FAIL

[Ian Campbell <ian.campbell@citrix.com>]

On Wed, 2015-06-24 at 06:03 +0000, osstest service user wrote:
> flight 58849 linux-arm-xen real [real]
> http://logs.test-lab.xenproject.org/osstest/logs/58849/
> 
> Regressions :-(
> 
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  test-armhf-armhf-xl-cubietruck 11 guest-start             fail REGR. vs. 58830

This was:
http://logs.test-lab.xenproject.org/osstest/logs/58849/test-armhf-armhf-xl-cubietruck/cubietruck-braque---var-log-kern.log

Jun 24 04:09:13 cubietruck-braque kernel: [  807.637687] ------------[ cut here ]------------
Jun 24 04:09:13 cubietruck-braque kernel: [  807.637756] kernel BUG at drivers/xen/grant-table.c:923!
Jun 24 04:09:13 cubietruck-braque kernel: [  807.637784] Internal error: Oops - BUG: 0 [#1] SMP ARM
Jun 24 04:09:13 cubietruck-braque kernel: [  807.637810] Modules linked in: xen_gntalloc bridge stp ipv6 llc brcmfmac brcmutil cfg80211
Jun 24 04:09:13 cubietruck-braque kernel: [  807.637899] CPU: 0 PID: 16206 Comm: vif1.0-q0-guest Not tainted 3.16.7-ckt12+ #1
Jun 24 04:09:13 cubietruck-braque kernel: [  807.637936] task: c12fc480 ti: d2d3c000 task.ti: d2d3c000
Jun 24 04:09:13 cubietruck-braque kernel: [  807.637977] PC is at gnttab_batch_copy+0xd4/0xe0
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638004] LR is at gnttab_batch_copy+0x1c/0xe0
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638030] pc : [<c04abf7c>]    lr : [<c04abec4>]    psr: a0000013
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638030] sp : d2d3deb0  ip : deadbeef  fp : d2d3df3c
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638091] r10: 00000001  r9 : 00000000  r8 : 00000008
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638124] r7 : 00000001  r6 : 00000001  r5 : 00000000  r4 : e1e38d30
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638159] r3 : 00000001  r2 : deadbeef  r1 : deadbeef  r0 : fffffff2
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638193] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638227] Control: 10c5387d  Table: 7b50406a  DAC: 00000015
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638257] Process vif1.0-q0-guest (pid: 16206, stack limit = 0xd2d3c248)
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638287] Stack: (0xd2d3deb0 to 0xd2d3e000)
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638316] dea0:                                     00000001 00000000 00000000 e1e30000
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638353] dec0: 00000001 c05d7c44 0000003e 00000ec2 d2d3df3c 00000000 00000000 00000001
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638391] dee0: dbbb7a80 00000000 00000000 00000008 00000000 d2d3df20 e1e38cfc e1e38d30
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638430] df00: 00000001 00000000 00000001 00000000 e1e38d30 e1e63530 0000003e 00000208
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638468] df20: d9f0f480 d9f0f480 00000001 00000000 d2d3df2c d2d3df34 d2d3df34 00000000
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638505] df40: 00000000 db34e380 00000000 e1e30000 c05d776c 00000000 00000000 00000000
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638543] df60: 00000000 c0264138 00000000 00000000 00000000 e1e30000 00000000 00000000
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638581] df80: d2d3df80 d2d3df80 00000000 00000000 d2d3df90 d2d3df90 d2d3dfac db34e380
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638638] dfa0: c026406c 00000000 00000000 c020f038 00000000 00000000 00000000 00000000
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638686] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638723] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638785] [<c04abf7c>] (gnttab_batch_copy) from [<c05d7c44>] (xenvif_kthread_guest_rx+0x4d8/0xbc0)
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638841] [<c05d7c44>] (xenvif_kthread_guest_rx) from [<c0264138>] (kthread+0xcc/0xe8)
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638887] [<c0264138>] (kthread) from [<c020f038>] (ret_from_fork+0x14/0x3c)
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638929] Code: 0affffe5 eaffffed e8bd80f8 e7f001f2 (e7f001f2) 
Jun 24 04:09:13 cubietruck-braque kernel: [  807.638978] ---[ end trace 98c74482d9a5771d ]---

Which looks familiar, although I can't seem to find it, does anyone
remember it? Are we missing a backport perhaps?

This is the 3.16.y based linux-arm-xen tree, which was recently updated
from a baseline of v3.16.4-ckt7 to v3.16.7-ckt12 (flight 58830) in both
cases plus "xen_arch_need_swiotlb" for swiotlb stuff.

This here was the next flight which only added the "xen: netback: read
hotplug script once at start of day.", which I don't think is related to
the failure, which I suspect is intermittent.

Ian.