I re-run the above, full PCI passthrough still attaches/detaches fine.
VFs attach fine
VFs break on detach
I've thrown qemu into GDB and this is the backtrace
Thread 4 "CPU 0/KVM" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f82f0e31700 (LWP 3998)]
0x000055d2f322d45d in notifier_remove (notifier=notifier@entry=0x55d2f40c5078)
at ./util/notify.c:31
31 QLIST_REMOVE(notifier, node);
(gdb) bt
#0 0x000055d2f322d45d in notifier_remove
(notifier=notifier@entry=0x55d2f40c5078) at ./util/notify.c:31
#1 0x000055d2f2df8df9 in kvm_irqchip_remove_change_notifier
(n=n@entry=0x55d2f40c5078) at ./accel/kvm/kvm-all.c:1409
#2 0x000055d2f2e56989 in vfio_exitfn (pdev=<optimized out>) at
./hw/vfio/pci.c:3079
#3 0x000055d2f3025c1b in pci_qdev_unrealize (dev=<optimized out>,
errp=<optimized out>) at ./hw/pci/pci.c:1131
#4 0x000055d2f2f8c6e2 in device_set_realized (obj=<optimized out>,
value=<optimized out>, errp=0x0) at ./hw/core/qdev.c:932
#5 0x000055d2f312449b in property_set_bool (obj=0x55d2f40c4430, v=<optimized
out>, name=<optimized out>, opaque=0x55d2f4083ee0, errp=0x0) at
./qom/object.c:2078
#6 0x000055d2f3128c84 in object_property_set_qobject
(obj=obj@entry=0x55d2f40c4430, value=value@entry=0x7f82dc2f7130,
name=name@entry=0x55d2f330d85d "realized", errp=errp@entry=0x0)
at ./qom/qom-qobject.c:26
#7 0x000055d2f31264ba in object_property_set_bool (obj=0x55d2f40c4430,
value=<optimized out>, name=0x55d2f330d85d "realized", errp=0x0) at
./qom/object.c:1336
#8 0x000055d2f2f56bca in acpi_pcihp_device_unplug_cb (hotplug_dev=<optimized
out>, s=<optimized out>, dev=0x55d2f40c4430, errp=<optimized out>) at
./hw/acpi/pcihp.c:269
#9 0x000055d2f2f56253 in acpi_pcihp_eject_slot (s=<optimized out>,
bsel=<optimized out>, slots=slots@entry=256) at ./hw/acpi/pcihp.c:170
#10 0x000055d2f2f56383 in pci_write (size=<optimized out>, data=256, addr=8,
opaque=<optimized out>) at ./hw/acpi/pcihp.c:341
#11 pci_write (opaque=<optimized out>, addr=<optimized out>, data=256,
size=<optimized out>) at ./hw/acpi/pcihp.c:332
#12 0x000055d2f2de9cfb in memory_region_write_accessor
(mr=mr@entry=0x55d2f4780970, addr=8, value=value@entry=0x7f82f0e304f8,
size=size@entry=4, shift=<optimized out>,
mask=mask@entry=4294967295, attrs=...) at ./memory.c:483
#13 0x000055d2f2de79ee in access_with_adjusted_size (addr=addr@entry=8,
value=value@entry=0x7f82f0e304f8, size=size@entry=4, access_size_min=<optimized
out>,
access_size_max=<optimized out>, access_fn=access_fn@entry=0x55d2f2de9bd0
<memory_region_write_accessor>, mr=0x55d2f4780970, attrs=...) at ./memory.c:544
#14 0x000055d2f2debfc3 in memory_region_dispatch_write
(mr=mr@entry=0x55d2f4780970, addr=8, data=<optimized out>, op=<optimized out>,
attrs=attrs@entry=...) at ./memory.c:1475
#15 0x000055d2f2d96a30 in flatview_write_continue (fv=fv@entry=0x7f82dc14bbc0,
addr=addr@entry=44552, attrs=..., buf=buf@entry=0x7f82f17e9000 "",
len=len@entry=4, addr1=<optimized out>,
l=<optimized out>, mr=0x55d2f4780970) at ./include/qemu/host-utils.h:164
#16 0x000055d2f2d96c46 in flatview_write (fv=0x7f82dc14bbc0, addr=44552,
attrs=..., buf=0x7f82f17e9000 "", len=4) at ./exec.c:3169
#17 0x000055d2f2d9b01f in address_space_write (as=as@entry=0x55d2f3956960
<address_space_io>, addr=addr@entry=44552, attrs=..., buf=<optimized out>,
len=len@entry=4) at ./exec.c:3259
#18 0x000055d2f2d9b09e in address_space_rw (as=as@entry=0x55d2f3956960
<address_space_io>, addr=addr@entry=44552, attrs=..., attrs@entry=...,
buf=<optimized out>, len=len@entry=4,
is_write=is_write@entry=true) at ./exec.c:3269
#19 0x000055d2f2dfc94f in kvm_handle_io (count=1, size=4, direction=<optimized
out>, data=<optimized out>, attrs=..., port=44552) at ./accel/kvm/kvm-all.c:2104
#20 kvm_cpu_exec (cpu=cpu@entry=0x55d2f3dc9090) at ./accel/kvm/kvm-all.c:2350
#21 0x000055d2f2dde53e in qemu_kvm_cpu_thread_fn (arg=0x55d2f3dc9090) at
./cpus.c:1318
#22 qemu_kvm_cpu_thread_fn (arg=arg@entry=0x55d2f3dc9090) at ./cpus.c:1290
#23 0x000055d2f321fe13 in qemu_thread_start (args=<optimized out>) at
./util/qemu-thread-posix.c:519
#24 0x00007f82f4290609 in start_thread (arg=<optimized out>) at
pthread_create.c:477
#25 0x00007f82f41b7153 in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
** Package changed: libvirt (Ubuntu) => qemu (Ubuntu)
** Summary changed:
- libvirt 6.0 : virtual machine stuck when detaching PCI device using virsh
command
+ qemu 4.2 segfaults on VF detach
** Also affects: qemu
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1867519
Title:
qemu 4.2 segfaults on VF detach
Status in QEMU:
New
Status in qemu package in Ubuntu:
Confirmed
Bug description:
After updating Ubuntu 20.04 to the Beta version, we get the following
error and the virtual machines stucks when detaching PCI devices using
virsh command:
Error:
error: Failed to detach device from /tmp/vf_interface_attached.xml
error: internal error: End of file from qemu monitor
steps to reproduce:
1. create a VM over Ubuntu 20.04 (5.4.0-14-generic)
2. attach PCI device to this VM (Mellanox VF for example)
3. try to detaching the PCI device using virsh command:
a. create a pci interface xml file:
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address type='pci' domain='0x0000' bus='0x11' slot='0x00'
function='0x2' />
</source>
</hostdev>
b. #virsh detach-device <VM-Doman-name> <pci interface xml file>
- Ubuntu release:
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
- Package ver:
libvirt0:
Installed: 6.0.0-0ubuntu3
Candidate: 6.0.0-0ubuntu5
Version table:
6.0.0-0ubuntu5 500
500 http://il.archive.ubuntu.com/ubuntu focal/main amd64 Packages
*** 6.0.0-0ubuntu3 100
100 /var/lib/dpkg/status
- What you expected to happen:
PCI device detached without any errors.
- What happened instead:
getting the errors above and he VM stuck
additional info:
after downgrading the libvirt0 package and all the dependent packages to 5.4
the previous, version, seems that the issue disappeared
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1867519/+subscriptions
