* Loop Back Mounted Files Cannot be UMounted, DomU Cannot Restart
@ 2007-03-12 23:43 Peter
2007-03-13 10:05 ` Ewan Mellor
0 siblings, 1 reply; 3+ messages in thread
From: Peter @ 2007-03-12 23:43 UTC (permalink / raw)
To: xen-devel
Hi. We have a problem where a domU exits and cannot be restarted. It
looks like the problem is because its file:/blah device is already
mounted. And it cannot be unmounted.
Any ideas on a fix? Or a way to umount that loop back device?
The only way we seem to be able to recover is with a dom0/host server
restart.
[root@host104 ~]# xm list | grep sitesound
(domU not running)
[root@host104 ~]# looplist.sh | grep sitesound
/dev/loop14: [0901]:89325577
(/home/users/sitesoundstudios.com/debian.sarge-2.ext3.nobackup)
(shows the domU file system is mounted as /dev/loop14)
[root@host104 ~]# ps auxf | grep [l]oop14\]
root 15438 0.0 0.0 0 0 ? S< Feb22 0:01 [loop14]
[root@host104 ~]# losetup -d /dev/loop14
ioctl: LOOP_CLR_FD: Device or resource busy
# cat /home/users/sitesoundstudios.com/params
rkernel = "/home/users/sitesoundstudios.com/linux"
memory = 288
swap = 128
name = "sitesoundstudios.com"
ipaddr = "72.249.38.171"
disk = [
'file:/home/users/sitesoundstudios.com/debian.sarge-2.ext3.nobackup,xvda1,w',
'file:/home/users/sitesoundstudios.com/swapfs.swp,xvda9,w' ]
root = "/dev/xvda1 ro"
restart = 'onreboot'
console = 50002
vif = [ 'mac=aa:00:56:6d:26:14,bridge=xen-br0' ]
xm version is 3.0.3-0
Possibly related is the alloc_pages errors below.
xend.log during the attempt to start the domU.
[2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:1253)
XendDomainInfo.construct: None
[2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:1285)
XendDomainInfo.initDomain: 201 1.0
[2007-03-08 21:53:47 xend 19559] DEBUG (balloon:127) Balloon: 3743796
KiB free;
need 294912; done.
[2007-03-08 21:53:47 xend 19559] INFO (image:136) buildDomain os=linux
dom=201
vcpus=1
[2007-03-08 21:53:47 xend 19559] DEBUG (image:191) dom = 201
[2007-03-08 21:53:47 xend 19559] DEBUG (image:192) image =
/home/users/sitesoundstudios.com/linux
[2007-03-08 21:53:47 xend 19559] DEBUG (image:193) store_evtchn = 1
[2007-03-08 21:53:47 xend 19559] DEBUG (image:194) console_evtchn = 2
[2007-03-08 21:53:47 xend 19559] DEBUG (image:195) cmdline =
root=/dev/xvda1 ro
[2007-03-08 21:53:47 xend 19559] DEBUG (image:196) ramdisk =
[2007-03-08 21:53:47 xend 19559] DEBUG (image:197) vcpus = 1
[2007-03-08 21:53:47 xend 19559] DEBUG (image:198) features =
[2007-03-08 21:53:47 xend 19559] DEBUG (blkif:24) exception looking up
device
number for xvda1: [Errno 2] No such file or directory: '/dev/xvda1'
[2007-03-08 21:53:47 xend 19559] DEBUG (DevController:110) DevController:
writing {'backend-id': '0', 'virtual-device': '51713', 'device-type':
'disk',
'state': '1', 'backend': '/local/domain/0/backend/vbd/201/51713'} to
/local/domain/201/device/vbd/51713.
[2007-03-08 21:53:47 xend 19559] DEBUG (DevController:112) DevController:
writing {'domain': 'sitesoundstudios.com', 'frontend':
'/local/domain/201/device/vbd/51713', 'dev': 'xvda1', 'state': '1',
'params':
'/home/users/sitesoundstudios.com/debian.sarge-2.ext3.nobackup', 'mode':
'w',
'online': '1', 'frontend-id': '201', 'type': 'file'} to
/local/domain/0/backend/vbd/201/51713.
[2007-03-08 21:53:47 xend 19559] DEBUG (blkif:24) exception looking up
device
number for xvda9: [Errno 2] No such file or directory: '/dev/xvda9'
[2007-03-08 21:53:47 xend 19559] DEBUG (DevController:110) DevController:
writing {'backend-id': '0', 'virtual-device': '51721', 'device-type':
'disk',
'state': '1', 'backend': '/local/domain/0/backend/vbd/201/51721'} to
/local/domain/201/device/vbd/51721.
[2007-03-08 21:53:47 xend 19559] DEBUG (DevController:112) DevController:
writing {'domain': 'sitesoundstudios.com', 'frontend':
'/local/domain/201/device/vbd/51721', 'dev': 'xvda9', 'state': '1',
'params':
'/home/users/sitesoundstudios.com/swapfs.swp', 'mode': 'w', 'online': '1',
'frontend-id': '201', 'type': 'file'} to
/local/domain/0/backend/vbd/201/51721.
[2007-03-08 21:53:47 xend 19559] DEBUG (DevController:110) DevController:
writing {'backend-id': '0', 'mac': 'aa:00:56:6d:26:14', 'handle': '0',
'state':
'1', 'backend': '/local/domain/0/backend/vif/201/0'} to
/local/domain/201/device/vif/0.
[2007-03-08 21:53:47 xend 19559] DEBUG (DevController:112) DevController:
writing {'bridge': 'xen-br0', 'domain': 'sitesoundstudios.com',
'handle': '0',
'script': '/etc/xen/scripts/vif-bridge', 'state': '1', 'frontend':
'/local/domain/201/device/vif/0', 'mac': 'aa:00:56:6d:26:14', 'online': '1',
'frontend-id': '201'} to /local/domain/0/backend/vif/201/0.
[2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:712)
Storing VM details: {'shadow_memory': '0', 'uuid':
'9cfb0c48-9bb2-c0bf-b410-d760bcfd24e1', 'on_reboot': 'restart',
'start_time':
'1173390827.91', 'on_poweroff': 'destroy', 'name': 'sitesoundstudios.com',
'xend/restart_count': '0', 'vcpus': '1', 'vcpu_avail': '1', 'memory': '288',
'on_crash': 'destroy', 'image': "(linux (kernel
/home/users/sitesoundstudios.com/linux) (root '/dev/xvda1 ro'))", 'maxmem':
'288'}
[2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:747)
Storing domain details: {'console/ring-ref': '2511515', 'console/port': '2',
'name': 'sitesoundstudios.com', 'console/limit': '1048576', 'vm':
'/vm/9cfb0c48-9bb2-c0bf-b410-d760bcfd24e1', 'domid': '201',
'cpu/0/availability': 'online', 'memory/target': '294912', 'store/ring-ref':
'1570138', 'store/port': '1'}
[2007-03-08 21:53:47 xend 19559] DEBUG (XendDomain:198) Cannot recreate
information for dying domain 163. Xend will ignore this domain from now on.
[2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:933)
XendDomainInfo.handleShutdownWatch
[2007-03-08 21:53:48 xend 19559] DEBUG (XendDomain:198) Cannot recreate
information for dying domain 163. Xend will ignore this domain from now on.
[2007-03-08 21:53:48 xend 19559] DEBUG (DevController:143) Waiting for
devices
vif.
[2007-03-08 21:53:48 xend 19559] DEBUG (DevController:149) Waiting for 0.
[2007-03-08 21:53:48 xend 19559] DEBUG (DevController:464)
hotplugStatusCallback /local/domain/0/backend/vif/201/0/hotplug-status.
Mar 8 17:46:44 host104 kernel: swapper: page allocation failure. order:0,
mode:0x20
Mar 8 17:46:44 host104 kernel: [<c013ac94>] __alloc_pages+0x215/0x30d
Mar 8 17:46:44 host104 kernel: [<c0153835>] kmem_getpages+0x35/0x96
Mar 8 17:46:44 host104 kernel: [<c0154514>] cache_grow+0xa8/0x173
Mar 8 17:46:44 host104 kernel: [<c01547a5>] cache_alloc_refill+0x1c6/0x1f6
Mar 8 17:46:44 host104 kernel: [<c01549ad>] kmem_cache_alloc+0x64/0x68
Mar 8 17:46:44 host104 kernel: [<c02c606e>]
alloc_skb_from_cache+0x50/0x103
Mar 8 17:46:44 host104 kernel: [<c0256597>] __dev_alloc_skb+0x4d/0x79
Mar 8 17:46:44 host104 kernel: [<dd0c1602>]
tg3_alloc_rx_skb+0x7e/0x141 [tg3]
Mar 8 17:46:44 host104 kernel: [<dd0c1b39>] tg3_rx+0x3e3/0x4ac [tg3]
Mar 8 17:46:44 host104 kernel: [<dd0c1c61>] tg3_poll+0x5f/0x170 [tg3]
Mar 8 17:46:44 host104 kernel: [<c02cc9ac>] net_rx_action+0x83/0x12f
Mar 8 17:46:44 host104 kernel: [<c011e292>] __do_softirq+0x52/0xb2
Mar 8 17:46:44 host104 kernel: [<c011e335>] do_softirq+0x43/0x4b
Mar 8 17:46:44 host104 kernel: [<c010637f>] do_IRQ+0x1f/0x25
Mar 8 17:46:44 host104 kernel: [<c02549c7>] evtchn_do_upcall+0x49/0x86
Mar 8 17:46:44 host104 kernel: [<c032a573>] schedule+0x393/0x6ae
Mar 8 17:46:44 host104 kernel: [<c0104bd1>] hypervisor_callback+0x3d/0x48
Mar 8 17:46:44 host104 kernel: [<c01089b5>] safe_halt+0x1a/0x36
Mar 8 17:46:44 host104 kernel: [<c0108993>] start_hz_timer+0x2/0xa
Mar 8 17:46:44 host104 kernel: [<c01029c0>] xen_idle+0x22/0x3d
Mar 8 17:46:44 host104 kernel: [<c0102a11>] cpu_idle+0x36/0x4b
Mar 8 17:46:44 host104 kernel: [<c03e675a>] start_kernel+0x194/0x1dd
Mar 8 17:46:44 host104 kernel: [<c03e62e1>] unknown_bootoption+0x0/0x1bc
Mar 8 17:46:44 host104 kernel: Mem-info:
Mar 8 17:46:44 host104 kernel: DMA per-cpu:
Mar 8 17:46:44 host104 kernel: cpu 0 hot: high 186, batch 31 used:30
Mar 8 17:46:44 host104 kernel: cpu 0 cold: high 62, batch 15 used:58
Mar 8 17:46:44 host104 kernel: DMA32 per-cpu: empty
Mar 8 17:46:44 host104 kernel: Normal per-cpu: empty
Mar 8 17:46:44 host104 kernel: HighMem per-cpu: empty
Mar 8 17:46:44 host104 kernel: Free pages: 968kB (0kB HighMem)
Mar 8 17:46:44 host104 kernel: Active:11096 inactive:75176 dirty:1968
writeback:0 unstable:0 free:242 slab:6302 mapped:7591 pagetables:360
Mar 8 17:46:44 host104 kernel: DMA free:968kB min:2724kB low:3404kB
high:4084kB active:44384kB inactive:300704kB present:464800kB
pages_scanned:0
all_unreclaimable? no
Mar 8 17:46:44 host104 kernel: lowmem_reserve[]: 0 0 0 0
Mar 8 17:46:44 host104 kernel: DMA32 free:0kB min:0kB low:0kB high:0kB
active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Mar 8 17:46:44 host104 kernel: lowmem_reserve[]: 0 0 0 0
Mar 8 17:46:44 host104 kernel: Normal free:0kB min:0kB low:0kB high:0kB
active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Mar 8 17:46:44 host104 kernel: lowmem_reserve[]: 0 0 0 0
Mar 8 17:46:44 host104 kernel: HighMem free:0kB min:128kB low:128kB
high:128kB
active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
Mar 8 17:46:44 host104 kernel: lowmem_reserve[]: 0 0 0 0
Mar 8 17:46:44 host104 kernel: DMA: 0*4kB 1*8kB 0*16kB 0*32kB 1*64kB
1*128kB
1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 968kB
Mar 8 17:46:44 host104 kernel: DMA32: empty
Mar 8 17:46:44 host104 kernel: Normal: empty
Mar 8 17:46:44 host104 kernel: HighMem: empty
Mar 8 17:46:44 host104 kernel: Swap cache: add 142243, delete 137647, find
876198/903026, race 0+1
Mar 8 17:46:44 host104 kernel: Free swap = 4672848kB
Mar 8 17:46:44 host104 kernel: Total swap = 4723080kB
Mar 8 17:46:44 host104 kernel: Free swap: 4672848kB
Mar 8 17:46:44 host104 kernel: 116200 pages of RAM
Mar 8 17:46:44 host104 kernel: 0 pages of HIGHMEM
Mar 8 17:46:44 host104 kernel: 18762 reserved pages
Mar 8 17:46:44 host104 kernel: 67516 pages shared
Mar 8 17:46:44 host104 kernel: 4596 pages swap cached
Mar 8 17:46:44 host104 kernel: 1968 pages dirty
Mar 8 17:46:44 host104 kernel: 0 pages writeback
Mar 8 17:46:44 host104 kernel: 7591 pages mapped
Mar 8 17:46:44 host104 kernel: 6302 pages slab
Mar 8 17:46:44 host104 kernel: 360 pages pagetables
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Loop Back Mounted Files Cannot be UMounted, DomU Cannot Restart
2007-03-12 23:43 Loop Back Mounted Files Cannot be UMounted, DomU Cannot Restart Peter
@ 2007-03-13 10:05 ` Ewan Mellor
2007-03-14 1:28 ` Peter
0 siblings, 1 reply; 3+ messages in thread
From: Ewan Mellor @ 2007-03-13 10:05 UTC (permalink / raw)
To: Peter; +Cc: xen-devel
On Tue, Mar 13, 2007 at 12:43:30PM +1300, Peter wrote:
> Hi. We have a problem where a domU exits and cannot be restarted. It
> looks like the problem is because its file:/blah device is already
> mounted. And it cannot be unmounted.
>
> Any ideas on a fix? Or a way to umount that loop back device?
>
> The only way we seem to be able to recover is with a dom0/host server
> restart.
>
> [root@host104 ~]# xm list | grep sitesound
> (domU not running)
>
> [root@host104 ~]# looplist.sh | grep sitesound
> /dev/loop14: [0901]:89325577
> (/home/users/sitesoundstudios.com/debian.sarge-2.ext3.nobackup)
>
> (shows the domU file system is mounted as /dev/loop14)
>
> [root@host104 ~]# ps auxf | grep [l]oop14\]
> root 15438 0.0 0.0 0 0 ? S< Feb22 0:01 [loop14]
>
> [root@host104 ~]# losetup -d /dev/loop14
> ioctl: LOOP_CLR_FD: Device or resource busy
>
> # cat /home/users/sitesoundstudios.com/params
> rkernel = "/home/users/sitesoundstudios.com/linux"
> memory = 288
> swap = 128
> name = "sitesoundstudios.com"
> ipaddr = "72.249.38.171"
> disk = [
> 'file:/home/users/sitesoundstudios.com/debian.sarge-2.ext3.nobackup,xvda1,w',
> 'file:/home/users/sitesoundstudios.com/swapfs.swp,xvda9,w' ]
> root = "/dev/xvda1 ro"
> restart = 'onreboot'
> console = 50002
> vif = [ 'mac=aa:00:56:6d:26:14,bridge=xen-br0' ]
>
> xm version is 3.0.3-0
>
> Possibly related is the alloc_pages errors below.
>
> xend.log during the attempt to start the domU.
>
> [2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:1253)
> XendDomainInfo.construct: None
> [2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:1285)
> XendDomainInfo.initDomain: 201 1.0
> [2007-03-08 21:53:47 xend 19559] DEBUG (balloon:127) Balloon: 3743796
> KiB free;
> need 294912; done.
> [2007-03-08 21:53:47 xend 19559] INFO (image:136) buildDomain os=linux
> dom=201
> vcpus=1
> [2007-03-08 21:53:47 xend 19559] DEBUG (image:191) dom = 201
> [2007-03-08 21:53:47 xend 19559] DEBUG (image:192) image =
> /home/users/sitesoundstudios.com/linux
> [2007-03-08 21:53:47 xend 19559] DEBUG (image:193) store_evtchn = 1
> [2007-03-08 21:53:47 xend 19559] DEBUG (image:194) console_evtchn = 2
> [2007-03-08 21:53:47 xend 19559] DEBUG (image:195) cmdline =
> root=/dev/xvda1 ro
> [2007-03-08 21:53:47 xend 19559] DEBUG (image:196) ramdisk =
> [2007-03-08 21:53:47 xend 19559] DEBUG (image:197) vcpus = 1
> [2007-03-08 21:53:47 xend 19559] DEBUG (image:198) features =
> [2007-03-08 21:53:47 xend 19559] DEBUG (blkif:24) exception looking up
> device
> number for xvda1: [Errno 2] No such file or directory: '/dev/xvda1'
> [2007-03-08 21:53:47 xend 19559] DEBUG (DevController:110) DevController:
> writing {'backend-id': '0', 'virtual-device': '51713', 'device-type':
> 'disk',
> 'state': '1', 'backend': '/local/domain/0/backend/vbd/201/51713'} to
> /local/domain/201/device/vbd/51713.
> [2007-03-08 21:53:47 xend 19559] DEBUG (DevController:112) DevController:
> writing {'domain': 'sitesoundstudios.com', 'frontend':
> '/local/domain/201/device/vbd/51713', 'dev': 'xvda1', 'state': '1',
> 'params':
> '/home/users/sitesoundstudios.com/debian.sarge-2.ext3.nobackup', 'mode':
> 'w',
> 'online': '1', 'frontend-id': '201', 'type': 'file'} to
> /local/domain/0/backend/vbd/201/51713.
> [2007-03-08 21:53:47 xend 19559] DEBUG (blkif:24) exception looking up
> device
> number for xvda9: [Errno 2] No such file or directory: '/dev/xvda9'
> [2007-03-08 21:53:47 xend 19559] DEBUG (DevController:110) DevController:
> writing {'backend-id': '0', 'virtual-device': '51721', 'device-type':
> 'disk',
> 'state': '1', 'backend': '/local/domain/0/backend/vbd/201/51721'} to
> /local/domain/201/device/vbd/51721.
> [2007-03-08 21:53:47 xend 19559] DEBUG (DevController:112) DevController:
> writing {'domain': 'sitesoundstudios.com', 'frontend':
> '/local/domain/201/device/vbd/51721', 'dev': 'xvda9', 'state': '1',
> 'params':
> '/home/users/sitesoundstudios.com/swapfs.swp', 'mode': 'w', 'online': '1',
> 'frontend-id': '201', 'type': 'file'} to
> /local/domain/0/backend/vbd/201/51721.
> [2007-03-08 21:53:47 xend 19559] DEBUG (DevController:110) DevController:
> writing {'backend-id': '0', 'mac': 'aa:00:56:6d:26:14', 'handle': '0',
> 'state':
> '1', 'backend': '/local/domain/0/backend/vif/201/0'} to
> /local/domain/201/device/vif/0.
> [2007-03-08 21:53:47 xend 19559] DEBUG (DevController:112) DevController:
> writing {'bridge': 'xen-br0', 'domain': 'sitesoundstudios.com',
> 'handle': '0',
> 'script': '/etc/xen/scripts/vif-bridge', 'state': '1', 'frontend':
> '/local/domain/201/device/vif/0', 'mac': 'aa:00:56:6d:26:14', 'online': '1',
> 'frontend-id': '201'} to /local/domain/0/backend/vif/201/0.
> [2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:712)
> Storing VM details: {'shadow_memory': '0', 'uuid':
> '9cfb0c48-9bb2-c0bf-b410-d760bcfd24e1', 'on_reboot': 'restart',
> 'start_time':
> '1173390827.91', 'on_poweroff': 'destroy', 'name': 'sitesoundstudios.com',
> 'xend/restart_count': '0', 'vcpus': '1', 'vcpu_avail': '1', 'memory': '288',
> 'on_crash': 'destroy', 'image': "(linux (kernel
> /home/users/sitesoundstudios.com/linux) (root '/dev/xvda1 ro'))", 'maxmem':
> '288'}
> [2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:747)
> Storing domain details: {'console/ring-ref': '2511515', 'console/port': '2',
> 'name': 'sitesoundstudios.com', 'console/limit': '1048576', 'vm':
> '/vm/9cfb0c48-9bb2-c0bf-b410-d760bcfd24e1', 'domid': '201',
> 'cpu/0/availability': 'online', 'memory/target': '294912', 'store/ring-ref':
> '1570138', 'store/port': '1'}
> [2007-03-08 21:53:47 xend 19559] DEBUG (XendDomain:198) Cannot recreate
> information for dying domain 163. Xend will ignore this domain from now on.
> [2007-03-08 21:53:47 xend.XendDomainInfo 19559] DEBUG (XendDomainInfo:933)
> XendDomainInfo.handleShutdownWatch
> [2007-03-08 21:53:48 xend 19559] DEBUG (XendDomain:198) Cannot recreate
> information for dying domain 163. Xend will ignore this domain from now on.
This looks suspicious too. It looks like you have a VM that has not been
properly cleaned up -- presumably it's the one that's holding your loopback
device open. Do you have the logs for what happened to domain 163?
Ewan.
> [2007-03-08 21:53:48 xend 19559] DEBUG (DevController:143) Waiting for
> devices
> vif.
> [2007-03-08 21:53:48 xend 19559] DEBUG (DevController:149) Waiting for 0.
> [2007-03-08 21:53:48 xend 19559] DEBUG (DevController:464)
> hotplugStatusCallback /local/domain/0/backend/vif/201/0/hotplug-status.
>
>
>
> Mar 8 17:46:44 host104 kernel: swapper: page allocation failure. order:0,
> mode:0x20
> Mar 8 17:46:44 host104 kernel: [<c013ac94>] __alloc_pages+0x215/0x30d
> Mar 8 17:46:44 host104 kernel: [<c0153835>] kmem_getpages+0x35/0x96
> Mar 8 17:46:44 host104 kernel: [<c0154514>] cache_grow+0xa8/0x173
> Mar 8 17:46:44 host104 kernel: [<c01547a5>] cache_alloc_refill+0x1c6/0x1f6
> Mar 8 17:46:44 host104 kernel: [<c01549ad>] kmem_cache_alloc+0x64/0x68
> Mar 8 17:46:44 host104 kernel: [<c02c606e>]
> alloc_skb_from_cache+0x50/0x103
> Mar 8 17:46:44 host104 kernel: [<c0256597>] __dev_alloc_skb+0x4d/0x79
> Mar 8 17:46:44 host104 kernel: [<dd0c1602>]
> tg3_alloc_rx_skb+0x7e/0x141 [tg3]
> Mar 8 17:46:44 host104 kernel: [<dd0c1b39>] tg3_rx+0x3e3/0x4ac [tg3]
> Mar 8 17:46:44 host104 kernel: [<dd0c1c61>] tg3_poll+0x5f/0x170 [tg3]
> Mar 8 17:46:44 host104 kernel: [<c02cc9ac>] net_rx_action+0x83/0x12f
> Mar 8 17:46:44 host104 kernel: [<c011e292>] __do_softirq+0x52/0xb2
> Mar 8 17:46:44 host104 kernel: [<c011e335>] do_softirq+0x43/0x4b
> Mar 8 17:46:44 host104 kernel: [<c010637f>] do_IRQ+0x1f/0x25
> Mar 8 17:46:44 host104 kernel: [<c02549c7>] evtchn_do_upcall+0x49/0x86
> Mar 8 17:46:44 host104 kernel: [<c032a573>] schedule+0x393/0x6ae
> Mar 8 17:46:44 host104 kernel: [<c0104bd1>] hypervisor_callback+0x3d/0x48
> Mar 8 17:46:44 host104 kernel: [<c01089b5>] safe_halt+0x1a/0x36
> Mar 8 17:46:44 host104 kernel: [<c0108993>] start_hz_timer+0x2/0xa
> Mar 8 17:46:44 host104 kernel: [<c01029c0>] xen_idle+0x22/0x3d
> Mar 8 17:46:44 host104 kernel: [<c0102a11>] cpu_idle+0x36/0x4b
> Mar 8 17:46:44 host104 kernel: [<c03e675a>] start_kernel+0x194/0x1dd
> Mar 8 17:46:44 host104 kernel: [<c03e62e1>] unknown_bootoption+0x0/0x1bc
> Mar 8 17:46:44 host104 kernel: Mem-info:
> Mar 8 17:46:44 host104 kernel: DMA per-cpu:
> Mar 8 17:46:44 host104 kernel: cpu 0 hot: high 186, batch 31 used:30
> Mar 8 17:46:44 host104 kernel: cpu 0 cold: high 62, batch 15 used:58
> Mar 8 17:46:44 host104 kernel: DMA32 per-cpu: empty
> Mar 8 17:46:44 host104 kernel: Normal per-cpu: empty
> Mar 8 17:46:44 host104 kernel: HighMem per-cpu: empty
> Mar 8 17:46:44 host104 kernel: Free pages: 968kB (0kB HighMem)
> Mar 8 17:46:44 host104 kernel: Active:11096 inactive:75176 dirty:1968
> writeback:0 unstable:0 free:242 slab:6302 mapped:7591 pagetables:360
> Mar 8 17:46:44 host104 kernel: DMA free:968kB min:2724kB low:3404kB
> high:4084kB active:44384kB inactive:300704kB present:464800kB
> pages_scanned:0
> all_unreclaimable? no
> Mar 8 17:46:44 host104 kernel: lowmem_reserve[]: 0 0 0 0
> Mar 8 17:46:44 host104 kernel: DMA32 free:0kB min:0kB low:0kB high:0kB
> active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
> Mar 8 17:46:44 host104 kernel: lowmem_reserve[]: 0 0 0 0
> Mar 8 17:46:44 host104 kernel: Normal free:0kB min:0kB low:0kB high:0kB
> active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
> Mar 8 17:46:44 host104 kernel: lowmem_reserve[]: 0 0 0 0
> Mar 8 17:46:44 host104 kernel: HighMem free:0kB min:128kB low:128kB
> high:128kB
> active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no
> Mar 8 17:46:44 host104 kernel: lowmem_reserve[]: 0 0 0 0
> Mar 8 17:46:44 host104 kernel: DMA: 0*4kB 1*8kB 0*16kB 0*32kB 1*64kB
> 1*128kB
> 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 968kB
> Mar 8 17:46:44 host104 kernel: DMA32: empty
> Mar 8 17:46:44 host104 kernel: Normal: empty
> Mar 8 17:46:44 host104 kernel: HighMem: empty
> Mar 8 17:46:44 host104 kernel: Swap cache: add 142243, delete 137647, find
> 876198/903026, race 0+1
> Mar 8 17:46:44 host104 kernel: Free swap = 4672848kB
> Mar 8 17:46:44 host104 kernel: Total swap = 4723080kB
> Mar 8 17:46:44 host104 kernel: Free swap: 4672848kB
> Mar 8 17:46:44 host104 kernel: 116200 pages of RAM
> Mar 8 17:46:44 host104 kernel: 0 pages of HIGHMEM
> Mar 8 17:46:44 host104 kernel: 18762 reserved pages
> Mar 8 17:46:44 host104 kernel: 67516 pages shared
> Mar 8 17:46:44 host104 kernel: 4596 pages swap cached
> Mar 8 17:46:44 host104 kernel: 1968 pages dirty
> Mar 8 17:46:44 host104 kernel: 0 pages writeback
> Mar 8 17:46:44 host104 kernel: 7591 pages mapped
> Mar 8 17:46:44 host104 kernel: 6302 pages slab
> Mar 8 17:46:44 host104 kernel: 360 pages pagetables
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Loop Back Mounted Files Cannot be UMounted, DomU Cannot Restart
2007-03-13 10:05 ` Ewan Mellor
@ 2007-03-14 1:28 ` Peter
0 siblings, 0 replies; 3+ messages in thread
From: Peter @ 2007-03-14 1:28 UTC (permalink / raw)
To: Ewan Mellor; +Cc: xen-devel
Ewan Mellor wrote:
>> [2007-03-08 21:53:48 xend 19559] DEBUG (XendDomain:198) Cannot recreate
>> information for dying domain 163. Xend will ignore this domain from now on.
>
> This looks suspicious too. It looks like you have a VM that has not been
> properly cleaned up -- presumably it's the one that's holding your loopback
> device open. Do you have the logs for what happened to domain 163?
>
> Ewan.
>
Did you have any particular logs in mind?
I think it was likely just from an xm destroy. Though an xm destroy
does not always lead to this problem.
Anyway to recover from this? Force Xen to release the loop back mounted
file:/ device?
Recap on our environment: Centos4, hotplug, loop back mounted files,
about 60 odd domUs, "page allocation failure" errors (typically with
networking code in the stack dump), xen 3.0.3, sometimes it seems like
the problem is triggered when there is high disk io load.
Any ideas or suggestions appreciated.
Regards, Peter
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2007-03-14 1:28 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2007-03-12 23:43 Loop Back Mounted Files Cannot be UMounted, DomU Cannot Restart Peter
2007-03-13 10:05 ` Ewan Mellor
2007-03-14 1:28 ` Peter
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