Re: [libvirt test] 92667: regressions - FAIL

[Wei Liu <wei.liu2@citrix.com>]

On Wed, Apr 27, 2016 at 08:49:23PM -0600, Jim Fehlig wrote:
> On 04/27/2016 04:22 PM, Andrew Cooper wrote:
> > On 27/04/2016 22:58, Jim Fehlig wrote:
> >> On 04/25/2016 05:26 AM, osstest service owner wrote:
> >>> flight 92667 libvirt real [real]
> >>> http://logs.test-lab.xenproject.org/osstest/logs/92667/
> >>>
> >>> Regressions :-(
> >>>
> >>> Tests which did not succeed and are blocking,
> >>> including tests which could not be run:
> >>>  test-amd64-i386-libvirt      14 guest-saverestore         fail REGR. vs. 91479
> >>>  test-amd64-amd64-libvirt-xsm 14 guest-saverestore         fail REGR. vs. 91479
> >>>  test-amd64-amd64-libvirt-pair 21 guest-migrate/src_host/dst_host fail REGR. vs. 91479
> >>>  test-amd64-i386-libvirt-pair 21 guest-migrate/src_host/dst_host fail REGR. vs. 91479
> >>>  test-amd64-amd64-libvirt-qemuu-debianhvm-amd64-xsm 12 guest-saverestore fail REGR. vs. 91479
> >>>  test-amd64-i386-libvirt-xsm  14 guest-saverestore         fail REGR. vs. 91479
> >>>  test-amd64-amd64-libvirt-vhd 13 guest-saverestore         fail REGR. vs. 91479
> >>>  test-amd64-i386-libvirt-qemuu-debianhvm-amd64-xsm 12 guest-saverestore fail REGR. vs. 91479
> >>>  test-amd64-amd64-libvirt     14 guest-saverestore         fail REGR. vs. 91479
> >> All of these save/restore and migration failures show the following error on the
> >> restore side
> >>
> >> 2016-04-25 10:16:18 UTC libxl: error:
> >> libxl_exec.c:118:libxl_report_child_exitstatus: conversion helper [26771] exited
> >> with error status 1
> >> 2016-04-25 10:16:18 UTC libxl: error: libxl_utils.c:507:libxl_read_exactly:
> >> file/stream truncated reading ipc msg header from domain 1 save/restore helper
> >> stdout pipe
> >> 2016-04-25 10:16:18 UTC libxl: error:
> >> libxl_exec.c:129:libxl_report_child_exitstatus: domain 1 save/restore helper
> >> [26772] died due to fatal signal Terminated
> >>
> >> I'm not sure if this problem has already been addressed by recent
> >> migration-related fixes.
> > This is testing two different versions of libvirt against the same
> > version of libxl.
> >
> > Looking at
> > http://logs.test-lab.xenproject.org/osstest/logs/92667/test-amd64-amd64-libvirt-qemuu-debianhvm-amd64-xsm/italia0---var-log-libvirt-libxl-libxl-driver.log
> >
> > 2016-04-25 08:36:03 UTC xc: progress: End of stream: 0/0    0%
> >
> > indicates that the save side is in v2 format (which is expected).  (I
> > should add at least an info print in libxl_stream_write() indicating the
> > pertinent  details).
> >
> > On the restore side,
> >
> > 2016-04-25 08:36:20 UTC libxl: debug:
> > libxl_stream_read.c:358:stream_header_done: Stream v2 (from legacy)
> > 2016-04-25 08:36:20 UTC libxl: debug:
> > libxl_stream_read.c:574:process_record: Record: 1, length 0
> > 2016-04-25 08:36:20 UTC libxl: error:
> > libxl_exec.c:118:libxl_report_child_exitstatus: conversion helper [3909]
> > exited with error status 1
> >
> > which means that the restore code was told that the stream was in legacy
> > format.  The legacy conversion script was forked and found that the
> > stream wasn't legacy.  (I have no idea where the real error message went
> > from that - it should be plumbed through into a info message, and
> > definitely does work when running `xl` on the command line).
> >
> > I suspect this is breakage from the LIBXL_ABI_VERSION changes.
> >
> > Because of the short-sightest mess that legacy migration was, it is not
> > possible for libxl to distinguish a legacy stream from a v2 stream in
> > libxl_domain_create_restore().  The caller (i.e. libvirt) must provide
> > the correct stream version in libxl_domain_restore_params.
> 
> How do I handle the case of a libvirt+Xen migV2 host migrating a domain to a
> libvirt+Xen migV1 host? Do you know how that scenario is handled in xl? Or is
> migrating a domain from migV2 host to migV1 host not supported?
> 

I don't think this configuration is supported. Obviously an old xen
system wouldn't have knowledge of the new format.

Wei.

> Thanks for  the help.
> 
> Regards,
> Jim
> >
> > ~Andrew
> >
> 

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