Re: [Xen-users] Xen3.3 / Xen3.4 CPU soft lockups under pvops 2.6.31/2.6.32

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Apr 08, 2010 at 01:34:24AM +0200, Pim van Riezen wrote:
> Good day,
> 
> We're trying to get 2.6.31 and 2.6.32 rolled out on our clusters to offer 
> newer features like FUSE fo our customers, but we're ran into a couple of 
> showstopper issues when deploying these kernels on busier guests, showing a 
> lot of errors like this:
> 

Which exact kernel versions are you using? From which kernel tree/branch? 


>   BUG: soft lockup - CPU#0 stuck for 561s! [swapper:0]
>   Modules linked in:
>   CPU 0:
>   Modules linked in:
>   Pid: 0, comm: swapper Not tainted 2.6.32.9xls-domU #2 
>   RIP: e030:[<ffffffff810093aa>]  [<ffffffff810093aa>] 
> hypercall_page+0x3aa/0x1001
>   RSP: e02b:ffffffff81691f70  EFLAGS: 00000246
>   RAX: 0000000000000000 RBX: ffffffff81690000 RCX: ffffffff810093aa
>   RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
>   RBP: ffffffff81896d30 R08: 0000000000000000 R09: ffffffff8100e3b2
>   R10: 0000000000000001 R11: 0000000000000246 R12: ffffffffffffffff
>   R13: ffffffff818ebf20 R14: ffffffff818eec70 R15: 0000000000000000
>   FS:  00007f8ac7a9c6e0(0000) GS:ffff8800022ac000(0000) knlGS:0000000000000000
>   CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
>   CR2: 00007f291b4c9000 CR3: 000000007d8c1000 CR4: 0000000000002660
>   DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>   DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>   Call Trace:
>    [<ffffffff8100ddb7>] ? xen_safe_halt+0xc/0x15
>    [<ffffffff8100bdcf>] ? xen_idle+0x37/0x40
>    [<ffffffff8100fe2e>] ? cpu_idle+0x4f/0x82
>    [<ffffffff818b6c42>] ? start_kernel+0x353/0x35f
> 
> in our hope to get rid of this issue we upgraded from Xen 3.3 to Xen 3.4.1.7 
> out of the gitco repos. The issue persisted. Is there a magic version of Xen, 
> preferably one that can be found in an rpm repository for CentOS 5, that 
> *does* properly support pvops kernels without these issues?
> 

I've used Xen 3.4.2 and Xen 4.0.0 with pvops dom0 kernels. 
pvops dom0 2.6.32 kernels _require_ Xen 4.0.0 or Xen 3.4.3.


> I'm also seing this one: 
> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=543 where the bug is 
> still open but no activity since 2008. I don't know if that bugzilla is still 
> being actively maintained?
> 

xen bugzilla is not actively used/maintained.
Usually the bugs are discussed/fixed on xen-devel mailinglist.

-- Pasi


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