[Qemu-devel] [Bug 1285505] Re: [ppa 2.0~git-20140225] SIGABRT with -virtfs

[Peter Maydell <peter.maydell@linaro.org>]

Actually, the interesting bit of the stack trace starts just below where
you cut it off, because object_initialize_with_type() is just asserting
that it wasn't called with a NULL pointer, so what we really want to
know is what the caller was...

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Title:
  [ppa 2.0~git-20140225] SIGABRT with -virtfs

Status in QEMU:
  New
Status in “qemu” package in Ubuntu:
  Triaged

Bug description:
  As requested on u-devel@, I tested QEMU
  2.0~git-20140225.aa0d1f4-0ubuntu2 from ppa:ubuntu-virt/candidate. This
  has a regression with virtfs.

  I created a simple cloud-image based VM with autopkgtest:

    $ sudo apt-get install autopkgtest
    $ adt-buildvm-ubuntu-cloud

  This part works fine with the new QEMU (it already boots the cloud-
  image in qemu and runs cloud-init). But running it with a shared 9p
  directory crashes:

    $ mkdir -p /tmp/shared
    $ qemu-system-x86_64 -enable-kvm -m 1024 -nographic -virtfs local,id=autopkgtest,path=/tmp/shared,security_model=none,mount_tag=myshare -snapshot adt-trusty-amd64-cloud.img
  **
  ERROR:/build/buildd/qemu-2.0~git-20140225.aa0d1f4/qom/object.c:331:object_initialize_with_type: assertion failed: (type != NULL)
  Abgebrochen (Speicherabzug geschrieben)

  It should be easy enough to reproduce and the assertion message
  already should be clear, but this is the intersting part of the
  (unretraced) stack trace:

   #2  0x00007fe3329a9195 in g_assertion_message (domain=domain@entry=0x0, file=file@entry=0x7fe334c5a8e8 "/build/buildd/qemu-2.0~git-20140225.aa0d1f4/qom/object.c", line=line@entry=331, func=func@entry=0x7fe334c5ac40 "object_initialize_with_type", message=message@entry=0x7fe336e06e40 "assertion failed: (type != NULL)") at /build/buildd/glib2.0-2.39.90/./glib/gtestutils.c:2291
           lstr = "331\000\377\177\000\000\320ޠF\377\177\000\000\220\026\321\066\343\177\000\000R\252\305\064\343\177\000"
           s = 0x7fe336e06e70 "pp\340\066\343\177"
   #3  0x00007fe3329a922a in g_assertion_message_expr (domain=0x0, file=0x7fe334c5a8e8 "/build/buildd/qemu-2.0~git-20140225.aa0d1f4/qom/object.c", line=331, func=0x7fe334c5ac40 "object_initialize_with_type", expr=<optimized out>) at /build/buildd/glib2.0-2.39.90/./glib/gtestutils.c:2306
           s = 0x7fe336e06e40 "assertion failed: (type != NULL)"

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