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During qemu driver shutdown, objects are freed in qemuStateCleanup that could still be used by active worker threads, resulting in crashes. E.g. a worker thread could be processing a monitor EOF event after the security manager is already disposed Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007fd9a9a1e1fe in virSecurityManagerMoveImageMetadata (mgr=0x7fd948012160, pid=-1, src=src@entry=0x7fd98c072c90, dst=dst@entry=0x0) at ../../src/security/security_manager.c:468 #1 0x00007fd9646ff0f0 in qemuSecurityMoveImageMetadata (driver=driver@entry=0x7fd948043830, vm=vm@entry=0x7fd98c066db0, src=src@entry=0x7fd98c072c90, dst=dst@entry=0x0) at ../../src/qemu/qemu_security.c:182 #2 0x00007fd96462c7b0 in qemuBlockRemoveImageMetadata (driver=driver@entry=0x7fd948043830, vm=vm@entry=0x7fd98c066db0, diskTarget=0x7fd98c072530 "vda", src=<optimized out>) at ../../src/qemu/qemu_block.c:2628 #3 0x00007fd9646929d6 in qemuProcessStop (driver=driver@entry=0x7fd948043830, vm=vm@entry=0x7fd98c066db0, reason=reason@entry=VIR_DOMAIN_SHUTOFF_SHUTDOWN, asyncJob=asyncJob@entry=QEMU_ASYNC_JOB_NONE, flags=<optimized out>) at ../../src/qemu/qemu_process.c:7585 #4 0x00007fd9646fc842 in processMonitorEOFEvent (vm=0x7fd98c066db0, driver=0x7fd948043830) at ../../src/qemu/qemu_driver.c:4794 #5 qemuProcessEventHandler (data=0x561a93febb60, opaque=0x7fd948043830) at ../../src/qemu/qemu_driver.c:4900 #6 0x00007fd9a9971a31 in virThreadPoolWorker (opaque=opaque@entry=0x561a93fb58e0) at ../../src/util/virthreadpool.c:163 (gdb) p mgr->drv $2 = (virSecurityDriverPtr) 0x0 Prior to commit 7cf76d4e3ab, the worker thread pool was freed before disposing any driver objects. Let's return to that pattern, but leave the other changes made by 7cf76d4e3ab. Signed-off-by: Tamara Schmitz <tamara.schmitz@suse.com> Signed-off-by: Jim Fehlig <jfehlig@suse.com> Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
Libvirt API for virtualization
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.
Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.
Further information about the libvirt project can be found on the website:
License
The libvirt C API is distributed under the terms of GNU Lesser
General Public License, version 2.1 (or later). Some parts of the code
that are not part of the C library may have the more restrictive GNU
General Public License, version 2.0 (or later). See the files
COPYING.LESSER and COPYING for full license
terms & conditions.
Installation
Instructions on building and installing libvirt can be found on the website:
https://libvirt.org/compiling.html
Contributing
The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:
https://libvirt.org/contribute.html
Contact
The libvirt project has two primary mailing lists:
- libvirt-users@redhat.com (for user discussions)
- libvir-list@redhat.com (for development only)
Further details on contacting the project are available on the website: