[Qemu-devel] [Bug 1762558] Re: Many crashes with "memslot_get_virt: slot_id 170 too big"-type errors in 2.12.0 rc2

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

IMHO it's best to keep this open until we find out what's going on;
it's not impossible it's something that's changed in qemu, and even if
it isn't qemu's fault then you won't be the only person who ends up
reporting it here, so it'll be good to get the answer.

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Title:
  Many crashes with "memslot_get_virt: slot_id 170 too big"-type errors
  in 2.12.0 rc2

Status in QEMU:
  New

Bug description:
  Since qemu 2.12.0 rc2 - qemu-2.12.0-0.6.rc2.fc29 - landed in Fedora
  Rawhide, just about all of our openQA-automated tests of Rawhide
  guests which run with qxl / SPICE graphics in the guest have died
  partway in, always shortly after the test switches from the installer
  (an X environment) to a console on a tty. qemu is, I think, hanging.
  There are always some errors like this right around the time of the
  hang:

  [2018-04-09T20:13:42.0736 UTC] [debug] QEMU: id 0, group 0, virt start 0, virt end ffffffffffffffff, generation 0, delta 0
  [2018-04-09T20:13:42.0736 UTC] [debug] QEMU: id 1, group 1, virt start 7f42dbc00000, virt end 7f42dfbfe000, generation 0, delta 7f42dbc00000
  [2018-04-09T20:13:42.0736 UTC] [debug] QEMU: id 2, group 1, virt start 7f42d7a00000, virt end 7f42dba00000, generation 0, delta 7f42d7a00000
  [2018-04-09T20:13:42.0736 UTC] [debug] QEMU: 
  [2018-04-09T20:13:42.0736 UTC] [debug] QEMU: (process:45812): Spice-CRITICAL **: memslot.c:111:memslot_get_virt: slot_id 218 too big, addr=da8e21fbda8e21fb

  or occasionally like this:

  [2018-04-09T20:13:58.0717 UTC] [debug] QEMU: id 0, group 0, virt start 0, virt end ffffffffffffffff, generation 0, delta 0
  [2018-04-09T20:13:58.0720 UTC] [debug] QEMU: id 1, group 1, virt start 7ff093c00000, virt end 7ff097bfe000, generation 0, delta 7ff093c00000
  [2018-04-09T20:13:58.0720 UTC] [debug] QEMU: id 2, group 1, virt start 7ff08fa00000, virt end 7ff093a00000, generation 0, delta 7ff08fa00000
  [2018-04-09T20:13:58.0720 UTC] [debug] QEMU: 
  [2018-04-09T20:13:58.0720 UTC] [debug] QEMU: (process:25622): Spice-WARNING **: memslot.c:68:memslot_validate_virt: virtual address out of range
  [2018-04-09T20:13:58.0720 UTC] [debug] QEMU:     virt=0x0+0x18 slot_id=0 group_id=1
  [2018-04-09T20:13:58.0721 UTC] [debug] QEMU:     slot=0x0-0x0 delta=0x0
  [2018-04-09T20:13:58.0721 UTC] [debug] QEMU: 
  [2018-04-09T20:13:58.0721 UTC] [debug] QEMU: (process:25622): Spice-WARNING **: display-channel.c:2426:display_channel_validate_surface: invalid surface_id 1048576
  [2018-04-09T20:14:14.0728 UTC] [debug] QEMU: id 0, group 0, virt start 0, virt end ffffffffffffffff, generation 0, delta 0
  [2018-04-09T20:14:14.0728 UTC] [debug] QEMU: id 1, group 1, virt start 7ff093c00000, virt end 7ff097bfe000, generation 0, delta 7ff093c00000
  [2018-04-09T20:14:14.0728 UTC] [debug] QEMU: id 2, group 1, virt start 7ff08fa00000, virt end 7ff093a00000, generation 0, delta 7ff08fa00000
  [2018-04-09T20:14:14.0728 UTC] [debug] QEMU: 
  [2018-04-09T20:14:14.0728 UTC] [debug] QEMU: (process:25622): Spice-CRITICAL **: memslot.c:122:memslot_get_virt: address generation is not valid, group_id 1, slot_id 0, gen 110, slot_gen 0

  The same tests running on Fedora 28 guests on the same hosts are not
  hanging, and the same tests were not hanging right before the qemu
  package got updated, so this seems very strongly tied to the new qemu.

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