Re: windows 2008 guest causing rcu_shed to emit NMI

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Thank you Marcelo,

Host node locking up sometimes later than yesterday, bur problem still
here, please see attached dmesg. Stuck process looks like
root     19251  0.0  0.0 228476 12488 ?        D    14:42   0:00
/usr/bin/kvm -no-user-config -device ? -device pci-assign,? -device
virtio-blk-pci,? -device

on fourth vm by count.

Should I try upstream kernel instead of applying patch to the latest
3.4 or it is useless?

On Thu, Jan 24, 2013 at 4:52 AM, Marcelo Tosatti <mtosatti@xxxxxxxxxx> wrote:
> On Tue, Jan 22, 2013 at 09:00:25PM +0300, Andrey Korolyov wrote:
>> Hi,
>>
>> problem described in the title happens on heavy I/O pressure on the
>> host, without idle=poll trace almost always is the same, involving
>> mwait, with poll and nohz=off RIP varies from time to time, at the
>> previous hang it was tg_throttle_down, rather than test_ti_thread_flag
>> in attached one. Both possible clocksource drivers, hpet and tsc, able
>> to reproduce that with equal probability. VMs are pinned over one of
>> two numa sets on two-head machine, mean emulator thread and each of
>> vcpu threads has its own cpuset cg with '0-5,12-17' or '6-11,18-23'.
>> I`ll appreciate any suggestions to try.
>
> Andrey,
>
> Can you reproduce with an upstream kernel? Commit
> 5cfc2aabcb282f fixes a livelock.
>
>  d2 75 c3 eb 03 41 89 c6 48 83 c4 18 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41
> 5f c3 <31> c0 c3 48 63 ff 48 c7 c2 80 37 01 00 48 8b 0c fd e0 d6 68 81
> [12738.508644] Call Trace:
> [12738.508648]  [<ffffffff81035a66>] ? walk_tg_tree_from+0x70/0x99
> [12738.508652]  [<ffffffff81014c03>] ? __switch_to_xtra+0x14c/0x160
> [12738.508656]  [<ffffffff8103bcce>] ? throttle_cfs_rq+0x4d/0x109
> [12738.508660]  [<ffffffff8103be70>] ? put_prev_task_fair+0x3f/0x65
> [12738.508663]  [<ffffffff8134c8ae>] ? __schedule+0x32e/0x5c3
> [12738.508666]  [<ffffffff8134ceee>] ? yield_to+0xfa/0x10c
> [12738.508669]  [<ffffffff8105d5af>] ? atomic_inc+0x3/0x4
> [12738.508678]  [<ffffffffa03a8fc4>] ? kvm_vcpu_on_spin+0x8c/0xf7 [kvm]
> [12738.508684]  [<ffffffffa030602f>] ? handle_pause+0x11/0x18

Attachment: dmesg.txt.gz
Description: GNU Zip compressed data


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