At the breaking function we have:
29 void notifier_remove(Notifier *notifier)
30 {
31 QLIST_REMOVE(notifier, node);
32 }
(gdb) p notifier
$1 = (Notifier *) 0x55d2f40c5078
(gdb) p *notifier
$2 = {notify = 0x0, node = {le_next = 0x0, le_prev = 0x0}}
And since QLIST_REMOVE is defined as:
140 #define QLIST_REMOVE(elm, field) do { \
141 if ((elm)->field.le_next != NULL) \
142 (elm)->field.le_next->field.le_prev = \
143 (elm)->field.le_prev; \
144 *(elm)->field.le_prev = (elm)->field.le_next; \
145 } while (/*CONSTCOND*/0)
(gdb) p (notifier)->node.le_next
$5 = (struct Notifier *) 0x0
(gdb) p &(notifier->node)
$11 = (struct {...} *) 0x55d2f40c5080
There actually is a != NULL check, might it have changed on the fly.
I need to look at it more thoroughly, but it should be enough to recognize a
known issue.
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https://bugs.launchpad.net/bugs/1867519
Title:
qemu 4.2 segfaults on VF detach
Status in QEMU:
Fix Committed
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
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