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Re: [Xen-API] Snapshot causes disk errors and VM crashes

  • To: 'Mark Benson' <md.benson@xxxxxxxxx>
  • From: Thanos Makatos <thanos.makatos@xxxxxxxxxx>
  • Date: Fri, 21 Nov 2014 12:47:59 +0000
  • Accept-language: en-GB, en-US
  • Cc: "xen-api@xxxxxxxxxxxxx" <xen-api@xxxxxxxxxxxxx>
  • Delivery-date: Fri, 21 Nov 2014 12:48:22 +0000
  • List-id: User and development list for XCP and XAPI <xen-api.lists.xen.org>
  • Thread-index: AQHQBK1K4fiUQcRZpEaGn+rvv5VNlZxpUbCQgABJAACAABqHkIABJvgAgAAqj6A=
  • Thread-topic: [Xen-API] Snapshot causes disk errors and VM crashes

(Please don't drop xen-api from the CC)

> I dropped them all here, the large ones are trimmed to the relevant day only:
> https://www.dropbox.com/sh/4v1l141dw7fao3c/AAC8YrMONznv6Wdl0Y0Yy
> ueCa?dl=0
> I think the relevant time frame is about 20-11-2014 at 09:20-10:30 - I think 
> the
> snapshot was around 09:35
> That's a bit non-standard but I don't see anything wrong with it.

I see lots of errors like the following:

Nov 20 09:39:21 kalimantan tapdisk[1899]: ERROR: errno -14 at vhd_complete: 
 op: 5, lsec: 33456128, secs: 8, nbytes: 4096, blk: 8168, blk_offset: 4294967295

Which most certainly lead to the VM experiencing I/O errors. errno -14 is 
EFAULT (bad address) which is returned to tapdisk by some fairly low level 
function, possible some system call, unfortunately there isn't more information 
related to that.

Can you check your logs for anything of interest around that time?
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