On 11/04/17 21:49, Dietmar Hahn wrote:
Am Dienstag, 11. April 2017, 20:03:14 schrieb Glenn Enright:
On 11/04/17 17:59, Juergen Gross wrote:
On 11/04/17 07:25, Glenn Enright wrote:
Hi all
We are seeing an odd issue with domu domains from xl destroy, under
recent 4.9 kernels a (null) domain is left behind.
I guess this is the dom0 kernel version?
This has occurred on a variety of hardware, with no obvious commonality.
4.4.55 does not show this behavior.
On my test machine I have the following packages installed under
centos6, from https://xen.crc.id.au/
~]# rpm -qa | grep xen
xen47-licenses-4.7.2-4.el6.x86_64
xen47-4.7.2-4.el6.x86_64
kernel-xen-4.9.21-1.el6xen.x86_64
xen47-ocaml-4.7.2-4.el6.x86_64
xen47-libs-4.7.2-4.el6.x86_64
xen47-libcacard-4.7.2-4.el6.x86_64
xen47-hypervisor-4.7.2-4.el6.x86_64
xen47-runtime-4.7.2-4.el6.x86_64
kernel-xen-firmware-4.9.21-1.el6xen.x86_64
I've also replicated the issue with 4.9.17 and 4.9.20
To replicate, on a cleanly booted dom0 with one pv VM, I run the
following on the VM
{
while true; do
dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync
done
}
Then on the dom0 I do this sequence to reliably get a null domain. This
occurs with oxenstored and xenstored both.
{
xl sync 1
xl destroy 1
}
xl list then renders something like ...
(null) 1 4 4 --p--d
9.8 0
Something is referencing the domain, e.g. some of its memory pages are
still mapped by dom0.
You can try
# xl debug-keys q
and further
# xl dmesg
to see the output of the previous command. The 'q' dumps domain
(and guest debug) info.
# xl debug-keys h
prints all possible parameters for more informations.
Dietmar.
I've done this as requested, below is the output.
(XEN) 'q' pressed -> dumping domain info (now=0x92:D6C271CE)
(XEN) General information for domain 0:
(XEN) refcnt=3 dying=0 pause_count=0
(XEN) nr_pages=387072 xenheap_pages=5 shared_pages=0 paged_pages=0
dirty_cpus={0-1} max_pages=4294967295
(XEN) handle=00000000-0000-0000-0000-000000000000 vm_assist=0000000d
(XEN) Rangesets belonging to domain 0:
(XEN) I/O Ports { 0-1f, 22-3f, 44-60, 62-9f, a2-cfb, d00-1007,
100c-ffff }
(XEN) log-dirty { }
(XEN) Interrupts { 1-30 }
(XEN) I/O Memory { 0-fedff, fef00-ffffff }
(XEN) Memory pages belonging to domain 0:
(XEN) DomPage list too long to display
(XEN) XenPage 000000000020e9c5: caf=c000000000000002,
taf=7400000000000002
(XEN) XenPage 000000000020e9c4: caf=c000000000000001,
taf=7400000000000001
(XEN) XenPage 000000000020e9c3: caf=c000000000000001,
taf=7400000000000001
(XEN) XenPage 000000000020e9c2: caf=c000000000000001,
taf=7400000000000001
(XEN) XenPage 00000000000e7d2e: caf=c000000000000002,
taf=7400000000000002
(XEN) NODE affinity for domain 0: [0]
(XEN) VCPU information and callbacks for domain 0:
(XEN) VCPU0: CPU0 [has=T] poll=0 upcall_pend=01 upcall_mask=00
dirty_cpus={0}
(XEN) cpu_hard_affinity={0} cpu_soft_affinity={0-3}
(XEN) pause_count=0 pause_flags=0
(XEN) No periodic timer
(XEN) VCPU1: CPU1 [has=T] poll=0 upcall_pend=00 upcall_mask=00
dirty_cpus={1}
(XEN) cpu_hard_affinity={1} cpu_soft_affinity={0-3}
(XEN) pause_count=0 pause_flags=0
(XEN) No periodic timer
(XEN) General information for domain 1:
(XEN) refcnt=1 dying=2 pause_count=2
(XEN) nr_pages=2114 xenheap_pages=0 shared_pages=0 paged_pages=0
dirty_cpus={} max_pages=1280256
(XEN) handle=a481c2eb-31e3-4ae6-9809-290e746c8eec vm_assist=0000000d
(XEN) Rangesets belonging to domain 1:
(XEN) I/O Ports { }
(XEN) log-dirty { }
(XEN) Interrupts { }
(XEN) I/O Memory { }
(XEN) Memory pages belonging to domain 1:
(XEN) DomPage 0000000000071c00: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c01: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c02: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c03: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c04: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c05: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c06: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c07: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c08: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c09: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c0a: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c0b: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c0c: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c0d: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c0e: caf=00000001, taf=7400000000000001
(XEN) DomPage 0000000000071c0f: caf=00000001, taf=7400000000000001
(XEN) NODE affinity for domain 1: [0]
(XEN) VCPU information and callbacks for domain 1:
(XEN) VCPU0: CPU0 [has=F] poll=0 upcall_pend=00 upcall_mask=01
dirty_cpus={}
(XEN) cpu_hard_affinity={0-3} cpu_soft_affinity={0-3}
(XEN) pause_count=0 pause_flags=0
(XEN) No periodic timer
(XEN) VCPU1: CPU1 [has=F] poll=0 upcall_pend=00 upcall_mask=01
dirty_cpus={}
(XEN) cpu_hard_affinity={0-3} cpu_soft_affinity={0-3}
(XEN) pause_count=0 pause_flags=0
(XEN) No periodic timer
(XEN) VCPU2: CPU2 [has=F] poll=0 upcall_pend=00 upcall_mask=01
dirty_cpus={}
(XEN) cpu_hard_affinity={0-3} cpu_soft_affinity={0-3}
(XEN) pause_count=0 pause_flags=1
(XEN) No periodic timer
(XEN) VCPU3: CPU3 [has=F] poll=0 upcall_pend=00 upcall_mask=01
dirty_cpus={}
(XEN) cpu_hard_affinity={0-3} cpu_soft_affinity={0-3}
(XEN) pause_count=0 pause_flags=0
(XEN) No periodic timer
(XEN) Notifying guest 0:0 (virq 1, port 4)
(XEN) Notifying guest 0:1 (virq 1, port 10)
(XEN) Notifying guest 1:0 (virq 1, port 0)
(XEN) Notifying guest 1:1 (virq 1, port 0)
(XEN) Notifying guest 1:2 (virq 1, port 0)
(XEN) Notifying guest 1:3 (virq 1, port 0)
(XEN) Shared frames 0 -- Saved frames 0
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