8:41 a.m.
Hi all,
I have a namespace question about passthrough disk(multipath device).
In case of enabling namespace and cgroups in qemu.conf, The target(s) of
the
multipath device won't be added into qemu-pr-helper's namespace under
certain
situation, It causes the PERSISTENT RESERVE command failure in guest.
While user starts a vm,
To build namespace, The qemuDomainSetupDisk() will be invoked via
threadA(this
thread id will be the qemu's pid),
To build cgroup, The qemuSetupImagePathCgroup() will be invoked via
threadB.
Both of the functions invoke the virDevMapperGetTargets() trying to
parse a
multipath device to target paths string, Then fill the targetPaths[].
The issue I experienced is:
After libvirtd started, Everything works well for the first booted vm
which has
the passthrough multipath device.
But If I shut it down & start it again, OR keep it running & start
another vm
which has other passthrough multipath device, Then the target(s) of the
fresh
started vm won't be added into the related qemu-pr-helper's namespace
and it
causes PERSISTENT RESERVE command failure in the corresponding guest.
I digged into code, In this situation, The targetPaths[] in
qemuDomainSetupDisk()
won't be filled, it keeps NULL after virDevMapperGetTargets() returns.
The virDevMapperGetTargets doesn't fill targetPaths[] because the
dm_task_run()
of libdevmapper returns 0 with errno 9(Bad file descriptor).
So far, I don't understand why the dm_task_run() return 0 in this
situation.
BTW, The virDevMapperGetTargets() can always successfully fill the
targetPaths[]
in qemuSetupImagePathCgroup().
Please refer to the following 2 tests:
The multipath configuration on host:
host:~ # multipath -l
vm1-data (3600140582d9024bc13f4b8db5ff12de0) dm-11 FreeNAS,lv68
size=6.0G features='0' hwhandler='1 alua' wp=rw
`-+- policy='service-time 0' prio=0 status=active
`- 2:0:0:2 sdd 8:48 active undef running
vm2-data (36001405fc5f29ace3ec4fb8acd32aae5) dm-8 FreeNAS,lv46
size=4.0G features='0' hwhandler='1 alua' wp=rw
`-+- policy='service-time 0' prio=0 status=active
`- 2:0:0:1 sde 8:64 active undef running
===================================================================
Test A:
host:~ # systemctl restart libvirtd
host:~ # virsh list
Id Name State
--------------------
host:~ #
host:~ # virsh domblklist vm1
Target Source
------------------------------------------
vda /opt/vms/vm1/disk0.qcow2
sda /dev/mapper/vm1-data
host:~ #
host:~ # virsh start vm1
Domain vm1 started
host:~ # virsh list
Id Name State
---------------------------
1 vm1 running
host:~ # nsenter -t $(pidof qemu-pr-helper) -a bash
host:~ # ls -l /dev/sd*
brw-rw---- 1 root disk 8, 48 Jul 14 16:30 /dev/sdd
host:~ # exit
exit
host:~ #
vm1:~ # lsscsi
[0:0:0:0] disk FreeNAS lv68 0123 /dev/sda
vm1:~ #
vm1:~ # sg_persist --in -k /dev/sda
FreeNAS lv68 0123
Peripheral device type: disk
PR generation=0x0, there are NO registered reservation keys
vm1:~ #
host:~ # virsh shutdown vm1
Domain vm1 is being shutdown
host:~ # virsh list
Id Name State
--------------------
host:~ #
host:~ # virsh start vm1
Domain vm1 started
host:~ # virsh list
Id Name State
---------------------------
2 vm1 running
host:~ # nsenter -t $(pidof qemu-pr-helper) -a bash
host:~ # ls -l /dev/sd*
ls: cannot access '/dev/sd*': No such file or directory
host:~ # exit
exit
host:~ #
vm1:~ # sg_persist --in -k /dev/sda
FreeNAS lv68 0123
Peripheral device type: disk
PR in (Read keys): Aborted command
Aborted command
vm1:~ #
===================================================================
Test B:
host:~ # systemctl restart libvirtd
host:~ # virsh list
Id Name State
--------------------
host:~ #
host:~ # virsh domblklist vm1
Target Source
------------------------------------------
vda /opt/vms/vm1/disk0.qcow2
sda /dev/mapper/vm1-data
host:~ #
host:~ # virsh start vm1
Domain vm1 started
host:~ # virsh list
Id Name State
---------------------------
1 vm1 running
host:~ # nsenter -t $(pidof qemu-pr-helper) -a bash
host:~ # ls -l /dev/sd*
brw-rw---- 1 root disk 8, 48 Jul 14 17:28 /dev/sdd
host:~ # exit
exit
host:~ #
vm1:~ # lsscsi
[2:0:0:0] disk FreeNAS lv68 0123 /dev/sda
vm1:~ #
vm1:~ # sg_persist --in -k /dev/sda
FreeNAS lv68 0123
Peripheral device type: disk
PR generation=0x0, there are NO registered reservation keys
vm1:~ #
host:~ # virsh list
Id Name State
---------------------------
1 vm1 running
host:~ #
host:~ # virsh domblklist vm2
Target Source
------------------------------------------
vda /opt/vms/vm2/disk0.qcow2
sda /dev/mapper/vm2-data
host:~ #
host:~ # virsh start vm2
Domain vm2 started
host:~ # virsh list
Id Name State
---------------------------
1 vm1 running
2 vm2 running
host:~ # nsenter -t $(qemu-pr-helper pid of vm2) -a bash
host:~ # ls -l /dev/sd*
ls: cannot access '/dev/sd*': No such file or directory
host:~ # exit
exit
host:~ #
vm2:~ # lsscsi
[0:0:0:0] disk FreeNAS lv46 0123 /dev/sda
vm2:~ #
vm2:~ # sg_persist --in -k /dev/sda
FreeNAS lv46 0123
Peripheral device type: disk
PR in (Read keys): Aborted command
Aborted command
vm2:~ #
===================================================================
Any comments will be much appreciated.
Thanks in advance,
Lin
9:38 a.m.
On 7/14/20 3:41 PM, Lin Ma wrote:
Hi all,
I have a namespace question about passthrough disk(multipath device).
In case of enabling namespace and cgroups in qemu.conf, The target(s) of
the
multipath device won't be added into qemu-pr-helper's namespace under
certain
situation, It causes the PERSISTENT RESERVE command failure in guest.
Yeah, this is expected. I mean, the failure is expected if not all
devices are added to the namespace.
While user starts a vm,
To build namespace, The qemuDomainSetupDisk() will be invoked via
threadA(this
thread id will be the qemu's pid),
To build cgroup, The qemuSetupImagePathCgroup() will be invoked via
threadB.
Both of the functions invoke the virDevMapperGetTargets() trying to parse a
multipath device to target paths string, Then fill the targetPaths[].
The issue I experienced is:
After libvirtd started, Everything works well for the first booted vm
which has
the passthrough multipath device.
But If I shut it down & start it again, OR keep it running & start
another vm
which has other passthrough multipath device, Then the target(s) of the
fresh
started vm won't be added into the related qemu-pr-helper's namespace
and it
causes PERSISTENT RESERVE command failure in the corresponding guest.
I digged into code, In this situation, The targetPaths[] in
qemuDomainSetupDisk()
won't be filled, it keeps NULL after virDevMapperGetTargets() returns.
The virDevMapperGetTargets doesn't fill targetPaths[] because the
dm_task_run()
of libdevmapper returns 0 with errno 9(Bad file descriptor).
So far, I don't understand why the dm_task_run() return 0 in this
situation.
BTW, The virDevMapperGetTargets() can always successfully fill the
targetPaths[]
in qemuSetupImagePathCgroup().
What is your libvirt version? I've merged a fix for something similar
not a long ago: v6.5.0-rc1~190
Can you please check v6.5.0?
Michal
10:35 p.m.
On 2020-07-14 14:38, Michal Privoznik wrote:
On 7/14/20 3:41 PM, Lin Ma wrote:
> Hi all,
>
> I have a namespace question about passthrough disk(multipath device).
> In case of enabling namespace and cgroups in qemu.conf, The target(s)
> of the
> multipath device won't be added into qemu-pr-helper's namespace under
> certain
> situation, It causes the PERSISTENT RESERVE command failure in guest.
>
Yeah, this is expected. I mean, the failure is expected if not all
devices are added to the namespace.
> While user starts a vm,
> To build namespace, The qemuDomainSetupDisk() will be invoked via
> threadA(this
> thread id will be the qemu's pid),
> To build cgroup, The qemuSetupImagePathCgroup() will be invoked via
> threadB.
>
> Both of the functions invoke the virDevMapperGetTargets() trying to
> parse a
> multipath device to target paths string, Then fill the targetPaths[].
>
> The issue I experienced is:
> After libvirtd started, Everything works well for the first booted vm
> which has
> the passthrough multipath device.
> But If I shut it down & start it again, OR keep it running & start
> another vm
> which has other passthrough multipath device, Then the target(s) of
> the fresh
> started vm won't be added into the related qemu-pr-helper's namespace
> and it
> causes PERSISTENT RESERVE command failure in the corresponding guest.
> I digged into code, In this situation, The targetPaths[] in
> qemuDomainSetupDisk()
> won't be filled, it keeps NULL after virDevMapperGetTargets() returns.
> The virDevMapperGetTargets doesn't fill targetPaths[] because the
> dm_task_run()
> of libdevmapper returns 0 with errno 9(Bad file descriptor).
> So far, I don't understand why the dm_task_run() return 0 in this
> situation.
> BTW, The virDevMapperGetTargets() can always successfully fill the
> targetPaths[]
> in qemuSetupImagePathCgroup().
What is your libvirt version? I've merged a fix for something similar
not a long ago: v6.5.0-rc1~190
Can you please check v6.5.0?
The libvirt version I used in the tests is git master.
The sure thing is that the multipath devices I used are valid and
functional.
In the test A or the test B, Everytime we restart libvirtd, The issue
won't happen for
the first booted vm.
In other words, The target of multipath device can be parsed & added to
qemu-pr-helper's
namespace for the first booted vm.
As long as libvirtd once invoked
qemuSetupImagePathCgroup()->virDevMapperGetTargetsImpl()
to successfully parse any valid multipath device,
From then on, The
qemuDomainSetupDisk()->virDevMapperGetTargetsImpl()->dm_task_run()
returns 0 with errno=9 when parsing any valid multipath device.
BTW, I ran the same tests on kernel 4.12 and kernel 5.6, Got the same
test results.
Thanks,
Lin
2:05 a.m.
On 7/15/20 5:35 AM, Lin Ma wrote:
On 2020-07-14 14:38, Michal Privoznik wrote:
> On 7/14/20 3:41 PM, Lin Ma wrote:
>> Hi all,
>>
>> I have a namespace question about passthrough disk(multipath device).
>> In case of enabling namespace and cgroups in qemu.conf, The target(s)
>> of the
>> multipath device won't be added into qemu-pr-helper's namespace under
>> certain
>> situation, It causes the PERSISTENT RESERVE command failure in guest.
>>
>
> Yeah, this is expected. I mean, the failure is expected if not all
> devices are added to the namespace.
>
>> While user starts a vm,
>> To build namespace, The qemuDomainSetupDisk() will be invoked via
>> threadA(this
>> thread id will be the qemu's pid),
>> To build cgroup, The qemuSetupImagePathCgroup() will be invoked via
>> threadB.
>>
>> Both of the functions invoke the virDevMapperGetTargets() trying to
>> parse a
>> multipath device to target paths string, Then fill the targetPaths[].
>>
>> The issue I experienced is:
>> After libvirtd started, Everything works well for the first booted vm
>> which has
>> the passthrough multipath device.
>> But If I shut it down & start it again, OR keep it running & start
>> another vm
>> which has other passthrough multipath device, Then the target(s) of
>> the fresh
>> started vm won't be added into the related qemu-pr-helper's namespace
>> and it
>> causes PERSISTENT RESERVE command failure in the corresponding guest.
>> I digged into code, In this situation, The targetPaths[] in
>> qemuDomainSetupDisk()
>> won't be filled, it keeps NULL after virDevMapperGetTargets() returns.
>> The virDevMapperGetTargets doesn't fill targetPaths[] because the
>> dm_task_run()
>> of libdevmapper returns 0 with errno 9(Bad file descriptor).
>> So far, I don't understand why the dm_task_run() return 0 in this
>> situation.
>> BTW, The virDevMapperGetTargets() can always successfully fill the
>> targetPaths[]
>> in qemuSetupImagePathCgroup().
>
> What is your libvirt version? I've merged a fix for something similar
> not a long ago: v6.5.0-rc1~190
>
> Can you please check v6.5.0?
The libvirt version I used in the tests is git master.
The sure thing is that the multipath devices I used are valid and
functional.
In the test A or the test B, Everytime we restart libvirtd, The issue
won't happen for
the first booted vm.
In other words, The target of multipath device can be parsed & added to
qemu-pr-helper's
namespace for the first booted vm.
As long as libvirtd once invoked
qemuSetupImagePathCgroup()->virDevMapperGetTargetsImpl()
to successfully parse any valid multipath device,
From then on, The
qemuDomainSetupDisk()->virDevMapperGetTargetsImpl()->dm_task_run()
returns 0 with errno=9 when parsing any valid multipath device.
At this point I'm wondering whether we are using the API correctly.
If you disable namespaces, then CGroups still need to know the targets
and will query dm. Does that work?
The aim is to do what 'dmsetup deps' does. Once you reach the error
state - does that command work?
errno=9 is EBADF so maybe this is a dm issue after all?
BTW:
Maybe we will need to merge the following patch to log error messages
from dm?
https://gitlab.com/MichalPrivoznik/libvirt/-/commit/ed3a7ae5d0cd3f492fe21...
Michal
9:36 a.m.
On 2020-07-17 07:05, Michal Prívozník wrote:
On 7/15/20 5:35 AM, Lin Ma wrote:
> On 2020-07-14 14:38, Michal Privoznik wrote:
>> On 7/14/20 3:41 PM, Lin Ma wrote:
>>> Hi all,
>>>
>>> I have a namespace question about passthrough disk(multipath
>>> device).
>>> In case of enabling namespace and cgroups in qemu.conf, The
>>> target(s) of the
>>> multipath device won't be added into qemu-pr-helper's namespace
>>> under certain
>>> situation, It causes the PERSISTENT RESERVE command failure in
>>> guest.
>>>
>>
>> Yeah, this is expected. I mean, the failure is expected if not all
>> devices are added to the namespace.
>>
>>> While user starts a vm,
>>> To build namespace, The qemuDomainSetupDisk() will be invoked via
>>> threadA(this
>>> thread id will be the qemu's pid),
>>> To build cgroup, The qemuSetupImagePathCgroup() will be invoked via
>>> threadB.
>>>
>>> Both of the functions invoke the virDevMapperGetTargets() trying to
>>> parse a
>>> multipath device to target paths string, Then fill the
>>> targetPaths[].
>>>
>>> The issue I experienced is:
>>> After libvirtd started, Everything works well for the first booted
>>> vm which has
>>> the passthrough multipath device.
>>> But If I shut it down & start it again, OR keep it running & start
>>> another vm
>>> which has other passthrough multipath device, Then the target(s) of
>>> the fresh
>>> started vm won't be added into the related qemu-pr-helper's
>>> namespace and it
>>> causes PERSISTENT RESERVE command failure in the corresponding
>>> guest.
>>> I digged into code, In this situation, The targetPaths[] in
>>> qemuDomainSetupDisk()
>>> won't be filled, it keeps NULL after virDevMapperGetTargets()
>>> returns.
>>> The virDevMapperGetTargets doesn't fill targetPaths[] because the
>>> dm_task_run()
>>> of libdevmapper returns 0 with errno 9(Bad file descriptor).
>>> So far, I don't understand why the dm_task_run() return 0 in this
>>> situation.
>>> BTW, The virDevMapperGetTargets() can always successfully fill the
>>> targetPaths[]
>>> in qemuSetupImagePathCgroup().
>>
>> What is your libvirt version? I've merged a fix for something similar
>> not a long ago: v6.5.0-rc1~190
>>
>> Can you please check v6.5.0?
>
> The libvirt version I used in the tests is git master.
> The sure thing is that the multipath devices I used are valid and
> functional.
>
> In the test A or the test B, Everytime we restart libvirtd, The issue
> won't happen for
> the first booted vm.
>
> In other words, The target of multipath device can be parsed & added
> to qemu-pr-helper's
> namespace for the first booted vm.
>
> As long as libvirtd once invoked
> qemuSetupImagePathCgroup()->virDevMapperGetTargetsImpl()
> to successfully parse any valid multipath device,
> From then on, The
> qemuDomainSetupDisk()->virDevMapperGetTargetsImpl()->dm_task_run()
> returns 0 with errno=9 when parsing any valid multipath device.
At this point I'm wondering whether we are using the API correctly.
If you disable namespaces, then CGroups still need to know the targets
and will query dm. Does that work?
Only disable namespaces or only disable CGroups,
The process of querying
dm deps works well.
The aim is to do what 'dmsetup deps' does. Once you reach the
error
state - does that command work?
'dmsetup deps' works well while I hit the
error state.
errno=9 is EBADF so maybe this is a dm issue after all?
Emm...So far I lean towards
to an issue in libvirt code, rather than in
dm.
BTW:
Maybe we will need to merge the following patch to log error messages
from dm?
https://gitlab.com/MichalPrivoznik/libvirt/-/commit/ed3a7ae5d0cd3f492fe21...
After merged this commit, I pasted part of log outputs here:
* libvirtd log:
2020-07-20 08:19:27.970+0000: 4621: info : libvirt version: 6.6.0
2020-07-20 08:19:27.970+0000: 4621: info : hostname: tw
......
2020-07-20 08:19:27.970+0000: 4636: debug : virThreadJobSetWorker:75 :
Thread 4636 is running worker prio-rpc-worker
2020-07-20 08:19:27.971+0000: 4631: debug : virThreadJobSetWorker:75 :
Thread 4631 is running worker rpc-worker
2020-07-20 08:19:27.971+0000: 4637: debug : virThreadJobSetWorker:75 :
Thread 4637 is running worker prio-rpc-worker
2020-07-20 08:19:27.971+0000: 4635: debug : virThreadJobSetWorker:75 :
Thread 4635 is running worker rpc-worker
2020-07-20 08:19:27.971+0000: 4634: debug : virThreadJobSetWorker:75 :
Thread 4634 is running worker rpc-worker
2020-07-20 08:19:27.971+0000: 4639: debug : virThreadJobSetWorker:75 :
Thread 4639 is running worker prio-rpc-worker
2020-07-20 08:19:27.971+0000: 4638: debug : virThreadJobSetWorker:75 :
Thread 4638 is running worker prio-rpc-worker
......
2020-07-20 08:19:27.971+0000: 4632: debug : virThreadJobSetWorker:75 :
Thread 4632 is running worker rpc-worker
......
2020-07-20 08:19:33.293+0000: 4632: debug : qemuSetupImagePathCgroup:73
: Allow path /opt/vms/guest01/disk0.qcow2, perms: rw
2020-07-20 08:19:33.293+0000: 4632: debug : qemuSetupImagePathCgroup:73
: Allow path /dev/mapper/control, perms: rw
2020-07-20 08:19:33.293+0000: 4632: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d1\x2dguest01.scope/devices.allow'
to 'c 10:236 rw'
2020-07-20 08:19:33.293+0000: 4632: debug : virFileClose:134 : Closed fd
28
2020-07-20 08:19:33.293+0000: 4632: debug : qemuSetupImagePathCgroup:73
: Allow path /dev/mapper/vm1-data, perms: rw
2020-07-20 08:19:33.293+0000: 4632: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d1\x2dguest01.scope/devices.allow'
to 'b 254:11 rw'
2020-07-20 08:19:33.293+0000: 4632: debug : virFileClose:134 : Closed fd
28
2020-07-20 08:19:33.293+0000: 4632: debug : virDevMapperDummyLogger:57 :
dm log: level=7 file=ioctl/libdm-iface.c:1863 errno=4 : dm version [
opencount flush ] [16384] (*1)
2020-07-20 08:19:33.293+0000: 4632: debug : virDevMapperDummyLogger:57 :
dm log: level=7 file=ioctl/libdm-iface.c:1863 errno=4 : dm deps vm1-data
[ noopencount flush ] [16384] (*1)
2020-07-20 08:19:33.293+0000: 4632: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d1\x2dguest01.scope/devices.allow'
to 'b 8:48 rw'
2020-07-20 08:19:33.293+0000: 4632: debug : virFileClose:134 : Closed fd
30
2020-07-20 08:19:33.293+0000: 4632: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d1\x2dguest01.scope/devices.allow'
to 'c 136:* rw'
2020-07-20 08:19:33.293+0000: 4632: debug : virFileClose:134 : Closed fd
30
......
2020-07-20 08:19:33.293+0000: 4632: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d1\x2dguest01.scope/devices.allow'
to 'c 10:232 rw'
2020-07-20 08:19:33.293+0000: 4632: debug : virFileClose:134 : Closed fd
30
2020-07-20 08:19:33.293+0000: 4632: debug : qemuSetupRNGCgroup:659 :
Setting Cgroup ACL for RNG device
......
......
2020-07-20 08:19:58.825+0000: 4635: debug : qemuSetupImagePathCgroup:73
: Allow path /opt/vms/guest02/disk0.qcow2, perms: rw
2020-07-20 08:19:58.825+0000: 4635: debug : qemuSetupImagePathCgroup:73
: Allow path /dev/mapper/control, perms: rw
2020-07-20 08:19:58.825+0000: 4635: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d2\x2dguest02.scope/devices.allow'
to 'c 10:236 rw'
2020-07-20 08:19:58.825+0000: 4635: debug : virFileClose:134 : Closed fd
32
2020-07-20 08:19:58.825+0000: 4635: debug : qemuSetupImagePathCgroup:73
: Allow path /dev/mapper/vm2-data, perms: rw
2020-07-20 08:19:58.825+0000: 4635: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d2\x2dguest02.scope/devices.allow'
to 'b 254:8 rw'
2020-07-20 08:19:58.825+0000: 4635: debug : virFileClose:134 : Closed fd
32
2020-07-20 08:19:58.825+0000: 4635: debug : virDevMapperDummyLogger:57 :
dm log: level=7 file=ioctl/libdm-iface.c:1863 errno=4 : dm deps vm2-data
[ noopencount flush ] [16384] (*1)
2020-07-20 08:19:58.825+0000: 4635: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d2\x2dguest02.scope/devices.allow'
to 'b 8:64 rw'
2020-07-20 08:19:58.825+0000: 4635: debug : virFileClose:134 : Closed fd
32
2020-07-20 08:19:58.825+0000: 4635: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d2\x2dguest02.scope/devices.allow'
to 'c 136:* rw'
2020-07-20 08:19:58.825+0000: 4635: debug : virFileClose:134 : Closed fd
32
......
2020-07-20 08:19:58.825+0000: 4635: debug : virCgroupSetValueRaw:454 :
Set value
'/sys/fs/cgroup/devices/machine.slice/machine-qemu\x2d2\x2dguest02.scope/devices.allow'
to 'c 10:232 rw'
2020-07-20 08:19:58.825+0000: 4635: debug : virFileClose:134 : Closed fd
32
2020-07-20 08:19:58.825+0000: 4635: debug : qemuSetupRNGCgroup:659 :
Setting Cgroup ACL for RNG device
......
* /var/log/libvirt/qemu/guest01.log:
qemu-system-x86_64 pid: 4752
qemu-pr-helper pid: 4762
2020-07-20 08:19:33.251+0000: 4752: debug :
qemuDomainSetupAllDisks:10180 : Setting up disks
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakeParentPath:3100 :
path=/var/run/libvirt/qemu/1-guest01.dev/mapper/vm1-data
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/1-guest01.dev/mapper mode=0777
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/1-guest01.dev mode=0777
2020-07-20 08:19:33.251+0000: 4752: debug :
qemuDomainCreateDeviceRecursive:9893 : Creating dev /dev/mapper/vm1-data
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakeParentPath:3100 :
path=/var/run/libvirt/qemu/1-guest01.dev/mapper/../dm-11
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/1-guest01.dev/mapper/.. mode=0777
2020-07-20 08:19:33.251+0000: 4752: debug :
qemuDomainCreateDeviceRecursive:9893 : Creating dev /dev/mapper/../dm-11
2020-07-20 08:19:33.251+0000: 4752: debug : virDevMapperDummyLogger:57 :
dm log: level=7 file=ioctl/libdm-iface.c:1863 errno=4 : dm version [
opencount flush ] [16384] (*1)
2020-07-20 08:19:33.251+0000: 4752: debug : virDevMapperDummyLogger:57 :
dm log: level=7 file=ioctl/libdm-iface.c:1863 errno=4 : dm deps vm1-data
[ noopencount flush ] [16384] (*1)
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakeParentPath:3100 :
path=/var/run/libvirt/qemu/1-guest01.dev/block/8:48
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/1-guest01.dev/block mode=0777
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/1-guest01.dev mode=0777
2020-07-20 08:19:33.251+0000: 4752: debug :
qemuDomainCreateDeviceRecursive:9893 : Creating dev /dev/block/8:48
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakeParentPath:3100 :
path=/var/run/libvirt/qemu/1-guest01.dev/block/../sdd
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/1-guest01.dev/block/.. mode=0777
2020-07-20 08:19:33.251+0000: 4752: debug :
qemuDomainCreateDeviceRecursive:9893 : Creating dev /dev/block/../sdd
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakeParentPath:3100 :
path=/var/run/libvirt/qemu/1-guest01.dev/mapper/control
2020-07-20 08:19:33.251+0000: 4752: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/1-guest01.dev/mapper mode=0777
2020-07-20 08:19:33.251+0000: 4752: debug :
qemuDomainCreateDeviceRecursive:9893 : Creating dev /dev/mapper/control
2020-07-20 08:19:33.251+0000: 4752: debug :
qemuDomainSetupAllDisks:10189 : Setup all disks
* /var/log/libvirt/qemu/guest02.log:
qemu-system-x86_64 pid: 4847
qemu-pr-helper pid: 4873
2020-07-20 08:19:58.768+0000: 4847: debug :
qemuDomainSetupAllDisks:10180 : Setting up disks
2020-07-20 08:19:58.768+0000: 4847: debug : virFileMakeParentPath:3100 :
path=/var/run/libvirt/qemu/2-guest02.dev/mapper/vm2-data
2020-07-20 08:19:58.768+0000: 4847: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/2-guest02.dev/mapper mode=0777
2020-07-20 08:19:58.768+0000: 4847: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/2-guest02.dev mode=0777
2020-07-20 08:19:58.768+0000: 4847: debug :
qemuDomainCreateDeviceRecursive:9893 : Creating dev /dev/mapper/vm2-data
2020-07-20 08:19:58.768+0000: 4847: debug : virFileMakeParentPath:3100 :
path=/var/run/libvirt/qemu/2-guest02.dev/mapper/../dm-8
2020-07-20 08:19:58.768+0000: 4847: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/2-guest02.dev/mapper/.. mode=0777
2020-07-20 08:19:58.768+0000: 4847: debug :
qemuDomainCreateDeviceRecursive:9893 : Creating dev /dev/mapper/../dm-8
2020-07-20 08:19:58.768+0000: 4847: debug : virDevMapperDummyLogger:57 :
dm log: level=7 file=ioctl/libdm-iface.c:1863 errno=4 : dm deps vm2-data
[ noopencount flush ] [16384] (*1)
2020-07-20 08:19:58.768+0000: 4847: debug : virDevMapperDummyLogger:57 :
dm log: level=3 file=ioctl/libdm-iface.c:1913 errno=-1 : device-mapper:
deps ioctl on vm2-data failed: Bad file descriptor
2020-07-20 08:19:58.768+0000: 4847: debug : virFileMakeParentPath:3100 :
path=/var/run/libvirt/qemu/2-guest02.dev/mapper/control
2020-07-20 08:19:58.768+0000: 4847: debug : virFileMakePathHelper:3037 :
path=/var/run/libvirt/qemu/2-guest02.dev/mapper mode=0777
2020-07-20 08:19:58.768+0000: 4847: debug :
qemuDomainCreateDeviceRecursive:9893 : Creating dev /dev/mapper/control
2020-07-20 08:19:58.768+0000: 4847: debug :
qemuDomainSetupAllDisks:10189 : Setup all disks
Thanks,
Lin
4:44 a.m.
On 7/20/20 4:36 PM, Lin Ma wrote:
On 2020-07-17 07:05, Michal Prívozník wrote:
> errno=9 is EBADF so maybe this is a dm issue after all?
Emm...So far I lean towards to an issue in libvirt code, rather than in dm.
You might be right after all. Turns out that the mass FD closing we do
before spawning QEMU closed /dev/mapper/control opened by earlier runs
of virDevMapperGetTargets() and thus the pre-exec hook which called the
function again was passing closed FD into ioctl(). I've posted patches:
https://www.redhat.com/archives/libvir-list/2020-July/msg01500.html
The first patch should be enough to fix the issue. Can you check please?
It fixed the issue in my limited testing.
Michal
8:44 a.m.
On 2020-07-22 09:44, Michal Privoznik wrote:
On 7/20/20 4:36 PM, Lin Ma wrote:
> On 2020-07-17 07:05, Michal Prívozník wrote:
>> errno=9 is EBADF so maybe this is a dm issue after all?
> Emm...So far I lean towards to an issue in libvirt code, rather than
> in dm.
You might be right after all. Turns out that the mass FD closing we do
before spawning QEMU closed /dev/mapper/control opened by earlier runs
of virDevMapperGetTargets() and thus the pre-exec hook which called
the function again was passing closed FD into ioctl(). I've posted
patches:
https://www.redhat.com/archives/libvir-list/2020-July/msg01500.html
The first patch should be enough to fix the issue. Can you check
please? It fixed the issue in my limited testing.
Oh, Turned out to be lack of dm_lib_release().
Confirmed, It did fix the issue.
Thanks a lot,
Lin
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Michal Prívozník