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

[Pim van Riezen <pi+lists@xxxxxxxxxxxx>]

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:

  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'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?

Cheers,
Pim


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