Bug 837943

Summary: Assertion `c->entries[i].ref == 0' failed, also random segfaults, when qemu calls bdrv_close_all
Product: Red Hat Enterprise Linux 7 Reporter: Richard W.M. Jones <rjones>
Component: qemu-kvmAssignee: Kevin Wolf <kwolf>
Status: CLOSED CURRENTRELEASE QA Contact: Virtualization Bugs <virt-bugs>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.0CC: amit.shah, berrange, cfergeau, dwmw2, ehabkost, hhuang, itamar, juzhang, knoel, kwolf, pbonzini, scottt.tw, shu, tburke
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: 1.1 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 836913 Environment:
Last Closed: 2014-06-13 11:14:27 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 836913    
Bug Blocks:    

Description Richard W.M. Jones 2012-07-05 21:20:53 UTC 
+++ This bug was initially created as a clone of Bug #836913 +++

To read a long description of the bug(s) involved:
https://www.redhat.com/archives/libguestfs/2012-July/msg00020.html

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 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 10:16:40 UTC 
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 12:08:59 UTC 
Fixed in upstream commit 7094f12f868fc1b75b105bcc676e15964dab77af, which is part of QEMU 1.1.
Comment 7 Shaolong Hu 2014-01-17 09:07:07 UTC 
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 11:14:27 UTC 
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.