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Re: [libvirt] [RFC: PATCHv4 00/15] outgoing migration via fd: rather than exec:

On 03/09/2011 08:45 PM, Eric Blake wrote:
Needs more testing - especially on root-squash NFS

Starting up a domain with backing store on root-squash NFS works fine.

When I try to save the domain to a directory on a root-squash NFS, though, the save hangs forever with a zombified child process with a WCHAN of "exit", and the parent process is sitting on recvmsg():

Thread 4 (Thread 0x7f6045f55700 (LWP 3754)):
#0  0x000000332840e9cd in recvmsg () from /lib64/libpthread.so.0
#1  0x00007f604ea7ddc9 in virFileOpenAs (
    path=0x7f6038009e90 "/remote/vhost-libvirt/qemu/RHEL6.save",
    openflags=577, mode=432, uid=107, gid=107, flags=1) at util/util.c:1513
#2  0x00000000004416b0 in qemudDomainSaveFlag (driver=0xbb96f0,
    dom=0x7f60380095a0, vm=0xd219c0,
    path=0x7f6038009e90 "/remote/vhost-libvirt/qemu/RHEL6.save",
    compressed=<value optimized out>) at qemu/qemu_driver.c:1924
#3  0x0000000000441a12 in qemudDomainSave (dom=0x7f60380095a0,
    path=0x7f6038009e90 "/remote/vhost-libvirt/qemu/RHEL6.save")
    at qemu/qemu_driver.c:2143
#4  0x00007f604eadeae6 in virDomainSave (domain=0x7f60380095a0,
    to=0x7f6038009e90 "/remote/vhost-libvirt/qemu/RHEL6.save")
    at libvirt.c:2280

I get a similar hang when I try to restore from an image saved on root-squash NFS.

(if it makes any difference, this is on F13, with qemu-kvm-0.13.0-1)

Do you want me to try bisecting it? Access to the machine?

Eric Blake (15):
   qemu: use lighter-weight fd:n on incoming tunneled migration
   qemu: consolidate duplicated monitor migration code
   qemu: improve efficiency of dd during snapshots
   qemu: support migration to fd
   util: use SCM_RIGHTS in virFileOperation when needed
   qemu: allow simple domain save to use fd: protocol
   qemu: simplify domain save fd handling
   storage: simplify fd handling
   util: rename virFileOperation to virFileOpenAs
   util: adjust indentation in previous patch
   qemu, storage: improve type safety
   qemu: use common API for reading difficult files
   qemu: consolidate migration to file code
   qemu: skip granting access during fd migration
   qemu: support fd: migration with compression

  src/libvirt_private.syms      |    2 +-
  src/qemu/qemu_driver.c        |  626 ++++++++++++++++-------------------------
  src/qemu/qemu_migration.c     |   45 +--
  src/qemu/qemu_monitor.c       |  124 ++++++++-
  src/qemu/qemu_monitor.h       |    4 +
  src/qemu/qemu_monitor_json.c  |  125 +--------
  src/qemu/qemu_monitor_json.h  |   23 +--
  src/qemu/qemu_monitor_text.c  |  123 +--------
  src/qemu/qemu_monitor_text.h  |   23 +--
  src/storage/storage_backend.c |   80 +++---
  src/util/util.c               |  161 ++++++++----
  src/util/util.h               |   15 +-
  12 files changed, 544 insertions(+), 807 deletions(-)

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