Bug 837943 - Assertion `c->entries[i].ref == 0' failed, also random segfaults, when qemu calls bdrv_close_all
Assertion `c->entries[i].ref == 0' failed, also random segfaults, when qemu c...
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
: rc
: ---
Assigned To: Kevin Wolf
Virtualization Bugs
Depends On: 836913
  Show dependency treegraph
Reported: 2012-07-05 17:20 EDT by Richard W.M. Jones
Modified: 2014-06-17 23:17 EDT (History)
14 users (show)

See Also:
Fixed In Version: 1.1
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 836913
Last Closed: 2014-06-13 07:14:27 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Richard W.M. Jones 2012-07-05 17:20:53 EDT
+++ This bug was initially created as a clone of Bug #836913 +++

To read a long description of the bug(s) involved:

Here is a simple reproducer:

$ cd /tmp
$ ulimit -Hc unlimited
$ ulimit -Sc unlimited
$ rm -f test.img
$ qemu-img create -f qcow2 test.img 100M
$ guestfish -a test.img run : part-disk /dev/sda gpt : copy-device-to-device /dev/zero /dev/sda1 size:98M
$ ls
core.23671  test.img

The core file isn't produced every time, but it's produced
pretty often, maybe 1 in 3 runs.  Simply repeat the qemu-img +
guestfish commands until it happens.

To get full debug information about what libguestfs is doing
add the -v and/or -x options to guestfish.  But basically it
appears to happen when we send SIGTERM to qemu.

--- Additional comment from rjones@redhat.com on 2012-07-04 11:04:03 EDT ---

The underlying issue is fixed in qemu-kvm >= 1.1.0
which is being rolled out to Fedora Rawhide today.
Comment 1 Richard W.M. Jones 2012-07-08 06:16:40 EDT
This would be fixed if qemu-kvm 1.1.0 went into RHEL 7.

I'm guessing (hoping perhaps?!?) that we'll try to put the
most recent qemu into RHEL 7 as late as we can get away with?
Comment 5 Paolo Bonzini 2012-10-25 08:08:59 EDT
Fixed in upstream commit 7094f12f868fc1b75b105bcc676e15964dab77af, which is part of QEMU 1.1.
Comment 7 Shaolong Hu 2014-01-17 04:07:07 EST
Verified on qemu-kvm-rhev-1.5.3-31.el7.x86_64:

[root@localhost tmp]# guestfish -a test.img run : part-disk /dev/sda gpt : copy-device-to-device /dev/zero /dev/sda1 size:98M
libguestfs: error: could not create appliance through libvirt: internal error: early end of file from monitor: possible problem:
qemu-kvm: /builddir/build/BUILD/qemu-1.5.3/hw/i386/acpi-build.c:135: acpi_get_pm_info: Assertion `obj' failed.
 [code=1 domain=10]
Comment 8 Ludek Smid 2014-06-13 07:14:27 EDT
This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.

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