Mailing List Archive: Cannot save/migrate domains

Cannot save/migrate domains

Feb 1, 2005, 2:27 AM

Post #1 of 6 (220 views)

Hi,

I had a problem trying to migrate domains, in trying to locate it I
noticed that saving domains doesn't work either, which I believe
explains why the receiving xfrd doesn't actually receive anything.

So here it goes...

xenone:/tmp# xm list
Name Id Mem(MB) CPU State Time(s) Console
Domain-0 0 123 0 r---- 900.6
sky 9 128 1 -b--- 32.8 9609

xenone:/tmp# xm save 9 test
Error: Error: [Failure instance: Traceback:
xen.xend.XendError.XendError, save failed

xfrd_log:

16364 [INF] XFRD> Accepted connection from 127.0.0.1:1352 on 2
16364 [INF] XFRD> Forked child pid=16373
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1354 on 2
16364 [INF] XFRD> Forked child pid=16377
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1356 on 2
16364 [INF] XFRD> Forked child pid=16385
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1358 on 2
16364 [INF] XFRD> Forked child pid=16388
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1360 on 2
16364 [INF] XFRD> Forked child pid=16390
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1362 on 2
16364 [INF] XFRD> Forked child pid=16405
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1365 on 2
16364 [INF] XFRD> Forked child pid=16408
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1524 on 2
16364 [INF] XFRD> Forked child pid=27213
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1526 on 2
16364 [INF] XFRD> Forked child pid=27215
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1538 on 2
16364 [INF] XFRD> Forked child pid=27492
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1543 on 2
16364 [INF] XFRD> Forked child pid=27497
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1545 on 2
16364 [INF] XFRD> Forked child pid=27519
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1548 on 2
16364 [INF] XFRD> Forked child pid=27522
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1551 on 2
16364 [INF] XFRD> Forked child pid=27525
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1553 on 2
16364 [INF] XFRD> Forked child pid=27527
16364 [INF] XFRD> Accepted connection from 127.0.0.1:1555 on 2
27530 [INF] XFRD> Xfr service for 127.0.0.1:1555
[DEBUG] Conn_init> flags=1
[DEBUG] Conn_init> write stream...
[DEBUG] stream_init>mode=w flags=1 compress=0
[DEBUG] stream_init> unbuffer...
[DEBUG] stream_init< err=0
[DEBUG] Conn_init> read stream...
[DEBUG] stream_init>mode=r flags=1 compress=0
[DEBUG] stream_init> unbuffer...
[DEBUG] stream_init< err=0
[DEBUG] Conn_sxpr>
(xfr.hello 1 0)[DEBUG] Conn_sxpr< err=0
[DEBUG] Conn_sxpr>
(xfr.save 9 "(domain (id 9) (name sky) (memory 128) (maxmem 131072)
(state -b---) (cpu 1) (cpu_time 32.860785883) (up_time 59850.3932199)
(start_time 1107193823.05) (console (status listening) (id 13) (domain
9) (local_port 13) (remote_port 1) (console_port 9609)) (devices (vif
(idx 0) (vif 0) (mac aa:00:00:20:ef:69) (evtchn 31 4) (index 0)) (vbd
(idx 0) (vdev 769) (device 2048) (mode w) (dev hda1) (uname phy:sda)
(node sda) (index 0))) (config (vm (name sky) (memory 128) (image
(linux (kernel /boot/vmlinuz-2.6.10-xenU) (root '/dev/hda1 ro') (args
4))) (device (vbd (uname phy:sda) (dev hda1) (mode w))) (device (vif
(mac aa:00:00:20:ef:69))))))" /tmp/test)[DEBUG] Conn_sxpr< err=0
[1107253673.485081] xc_linux_save start 9

xc_linux_save start 9

xend.log

[2005-02-01 10:27:28 xend] INFO (XendMigrate:370) Save BEGIN: ['save',
['id', '16'], ['state', 'begin'], ['domain', '9'], ['file',
'/tmp/test']]
[2005-02-01 10:27:28 xend] INFO (XendRoot:91) EVENT> xend.domain.save
['sky', '9', 'begin', ['save', ['id', '16'], ['state', 'begin'],
['domain', '9'], ['file', '/tmp/test']]]
[2005-02-01 10:27:28 xend] INFO (XendMigrate:390) Save ERROR: ['save',
['id', '16'], ['state', 'error'], ['domain', '9'], ['file',
'/tmp/test']]
[2005-02-01 10:27:28 xend] INFO (XendRoot:91) EVENT> xend.domain.save
['sky', '9', 'error', ['save', ['id', '16'], ['state', 'error'],
['domain', '9'], ['file', '/tmp/test']]]

xend-debug.log

al_port 13) (remote_port 1) (console_port 9609)) (devices (vif (idx 0)
(vif 0) (mac aa:00:00:20:ef:69) (evtchn 31 4) (index 0)) (vbd (idx 0)
(vdev 769) (device 2048) (mode w) (dev hda1) (uname phy:sda) (node sda)
(index 0))) (config (vm (name sky) (memory 128) (image (linux (kernel
/boot/vmlinuz-2.6.10-xenU) (root '/dev/hda1 ro') (args 4))) (device
(vbd (uname phy:sda) (dev hda1) (mode w))) (device (vif (mac
aa:00:00:20:ef:69))))))
***request> begin
xfr_err> ['xfr.err', '0']
xfr_err> <type 'str'> 0
Xfrd>connectionLost> [Failure instance: Traceback:
twisted.internet.error.ConnectionDone, Connection was closed cleanly.
]
XfrdSaveInfo>connectionLost> [Failure instance: Traceback:
twisted.internet.error.ConnectionDone, Connection was closed cleanly.
]
XfrdInfo>connectionLost> [Failure instance: Traceback:
twisted.internet.error.ConnectionDone, Connection was closed cleanly.
]
Error> save failed
Error> calling errback
***cbremove> [Failure instance: Traceback:
xen.xend.XendError.XendError, save failed
]
***_delete_session> 18
clientConnectionLost> connector= <twisted.internet.tcp.Connector
instance at 0x4074bfcc> reason= [Failure instance: Traceback:
twisted.internet.error.ConnectionDone, Connection was closed cleanly.
]

kernel = "/boot/vmlinuz-2.6.10-xenU"
memory = 128
name = "sky"
disk = [ 'phy:sda,hda1,w' ]
root = "/dev/hda1 ro"
extra = "4"

xenone:/tmp# xm info
system : Linux
host : xenone
release : 2.6.10-xen0xen0multipath
version : #4 Sun Jan 30 14:38:14 GMT 2005
machine : i686
cores : 1
hyperthreads_per_core : 2
cpu_mhz : 2799
memory : 2559
free_memory : 2277

Xen version 2.0.3 (root@localdomain) (gcc version 3.3.5 (Debian
1:3.3.5-5)) Sun Jan 30 11:14:18 GMT 2005

Built from source under 2.6.10, everything else seems to be working.
Tried both using raw sda and using a lvm device, neither work.

Cheers
Arthur

-----
CTO @ Fotango Ltd
+447834716919
http://www.fotango.com/

Re: Cannot save/migrate domains [ In reply to ]

abergman at fotango

Feb 1, 2005, 10:10 AM

Post #2 of 6 (218 views)

Permalink

Digging around a bit more...

strace -f xfrd

xm save 2 foo

[pid 13618] open("/proc/xen/privcmd", O_RDWR) = 5
[pid 13618] gettimeofday({1107281605, 724657}, NULL) = 0
[pid 13618] write(1, "13615 [INF] XFRD> Accepted conne"..., 1278) = 1278
[pid 13618] mlock(0xbfffeea0, 2516) = 0
[pid 13618] mlock(0xbfffbd50, 80) = 0
[pid 13618] ioctl(5, SNDCTL_DSP_RESET, 0xbfffbd10) = 0
[pid 13618] munlock(0xbfffbd50, 80) = 0
[pid 13618] old_mmap(NULL, 4096, PROT_READ, MAP_SHARED, 5, 0) =
0x40019000
[pid 13618] ioctl(5, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE,
0xbfffbd90) = 0
[pid 13618] old_mmap(NULL, 4096, PROT_READ, MAP_SHARED, 5, 0) =
0x4001a000
[pid 13618] ioctl(5, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE,
0xbfffbd90) = 0
[pid 13618] old_mmap(NULL, 131072, PROT_READ, MAP_SHARED, 5, 0) =
0x40316000
[pid 13618] ioctl(5, SNDCTL_DSP_STEREO, 0xbfffbd90) = 0
[pid 13618] ioctl(5, SNDCTL_DSP_GETBLKSIZE, 0xbfffbdb4) = 0
[pid 13618] old_mmap(NULL, 4194304, PROT_READ, MAP_SHARED, 5, 0) =
0x40336000
[pid 13618] ioctl(5, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE,
0xbfffbd90) = -1 EFAULT (Bad address)
[pid 13618] munmap(0x40336000, 4194304) = 0
[pid 13618] --- SIGSEGV (Segmentation fault) @ 0 (0) ---
Process 13618 detached

Any hints on how to track this down?

-----
CTO @ Fotango Ltd
+447834716919
http://www.fotango.com/

On 1 Feb 2005, at 09:27, Arthur Bergman wrote:

Re: Cannot save/migrate domains [ In reply to ]

abergman at fotango

Feb 1, 2005, 10:14 AM

Post #3 of 6 (218 views)

Permalink

And slightly bit more..

gdb xfrd
(gdb) set follow-fork-mode child
(gdb) run
Starting program: /usr/sbin/xfrd

Program received signal SIGSEGV, Segmentation fault.
[Switching to process 13699]
0x40026808 in xc_linux_save () from /usr/lib/libxc.so.2.0
(gdb) bt
#0 0x40026808 in xc_linux_save () from /usr/lib/libxc.so.2.0
#1 0x0804d546 in xen_domain_snd (xend=0xbffffb20, io=0x805fbe0, dom=2,
vmconfig=0x805f6d8 "(domain (id 2) (name test) (memory 128) (maxmem
131072) (state -b---) (cpu 0) (cpu_time 4.030152025) (up_time
611.702224016) (start_time 1107281260.96) (console (status listening)
(id 17) (domain 2) ("..., vmconfig_n=666, live=0, resource=0) at
xen_domain.c:103
#2 0x0804befb in xfr_save (args=0x805d87c, state=0xbffffa50,
xend=0xbffffb20, file=0x805f9b8 "/tmp/bla") at xfrd.c:774
#3 0x0804c8d3 in xfrd_service (args=0x805d87c, peersock=6, peer_in=
{sin_family = 2, sin_port = 44292, sin_addr = {s_addr =
16777343}, sin_zero = "\000\000\000\000\000\000\000"}) at xfrd.c:950
#4 0x0804ccf4 in xfrd_accept (args=0x805d87c, sock=2) at xfrd.c:1024
#5 0x0804ce01 in xfrd_select (args=0x805d87c, listen_sock=2) at
xfrd.c:1054
#6 0x0804d0f1 in xfrd_main (args=0x805d87c) at xfrd.c:1210
#7 0x0804d273 in main (argc=1, argv=0xbffffe24) at xfrd.c:1264
(gdb)

I guess I am going to need to recompile with debugging on.

Cheers
Arthur

-----
CTO @ Fotango Ltd
+447834716919
http://www.fotango.com/

On 1 Feb 2005, at 17:10, Arthur Bergman wrote:

> Digging around a bit more...
>
> strace -f xfrd
>
> xm save 2 foo
>
> [pid 13618] open("/proc/xen/privcmd", O_RDWR) = 5
> [pid 13618] gettimeofday({1107281605, 724657}, NULL) = 0
> [pid 13618] write(1, "13615 [INF] XFRD> Accepted conne"..., 1278) =
> 1278
> [pid 13618] mlock(0xbfffeea0, 2516) = 0
> [pid 13618] mlock(0xbfffbd50, 80) = 0
> [pid 13618] ioctl(5, SNDCTL_DSP_RESET, 0xbfffbd10) = 0
> [pid 13618] munlock(0xbfffbd50, 80) = 0
> [pid 13618] old_mmap(NULL, 4096, PROT_READ, MAP_SHARED, 5, 0) =
> 0x40019000
> [pid 13618] ioctl(5, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE,
> 0xbfffbd90) = 0
> [pid 13618] old_mmap(NULL, 4096, PROT_READ, MAP_SHARED, 5, 0) =
> 0x4001a000
> [pid 13618] ioctl(5, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE,
> 0xbfffbd90) = 0
> [pid 13618] old_mmap(NULL, 131072, PROT_READ, MAP_SHARED, 5, 0) =
> 0x40316000
> [pid 13618] ioctl(5, SNDCTL_DSP_STEREO, 0xbfffbd90) = 0
> [pid 13618] ioctl(5, SNDCTL_DSP_GETBLKSIZE, 0xbfffbdb4) = 0
> [pid 13618] old_mmap(NULL, 4194304, PROT_READ, MAP_SHARED, 5, 0) =
> 0x40336000
> [pid 13618] ioctl(5, SNDCTL_DSP_SPEED or SOUND_PCM_READ_RATE,
> 0xbfffbd90) = -1 EFAULT (Bad address)
> [pid 13618] munmap(0x40336000, 4194304) = 0
> [pid 13618] --- SIGSEGV (Segmentation fault) @ 0 (0) ---
> Process 13618 detached
>
>
> Any hints on how to track this down?
>
> -----
> CTO @ Fotango Ltd
> +447834716919
> http://www.fotango.com/
>
> On 1 Feb 2005, at 09:27, Arthur Bergman wrote:

Re: Cannot save/migrate domains [ In reply to ]

abergman at fotango

Feb 1, 2005, 10:26 AM

Post #4 of 6 (218 views)

Permalink

And now with debugging turned in libcx.so.2.0

0x40026868 in xc_linux_save (xc_handle=8, ioctxt=0xbffff8f0) at
xc_linux_save.c:516
516 if (
!translate_mfn_to_pfn(&pfn_to_mfn_frame_list[i/1024]) ){
(gdb) bt
#0 0x40026868 in xc_linux_save (xc_handle=8, ioctxt=0xbffff8f0) at
xc_linux_save.c:516
#1 0x0804d546 in xen_domain_snd (xend=0xbffffb20, io=0x805fbe0, dom=2,
vmconfig=0x805f6d8 "(domain (id 2) (name test) (memory 128) (maxmem
131072) (state -b---) (cpu 0) (cpu_time 4.059911993) (up_time
1064.72708416) (start_time 1107281260.96) (console (status listening)
(id 17) (domain 2) ("..., vmconfig_n=666, live=0, resource=0) at
xen_domain.c:103
#2 0x0804befb in xfr_save (args=0x805d87c, state=0xbffffa50,
xend=0xbffffb20, file=0x805f9b8 "/tmp/bla") at xfrd.c:774
#3 0x0804c8d3 in xfrd_service (args=0x805d87c, peersock=6, peer_in=
{sin_family = 2, sin_port = 44804, sin_addr = {s_addr =
16777343}, sin_zero = "\000\000\000\000\000\000\000"}) at xfrd.c:950
#4 0x0804ccf4 in xfrd_accept (args=0x805d87c, sock=2) at xfrd.c:1024
#5 0x0804ce01 in xfrd_select (args=0x805d87c, listen_sock=2) at
xfrd.c:1054
#6 0x0804d0f1 in xfrd_main (args=0x805d87c) at xfrd.c:1210
#7 0x0804d273 in main (argc=1, argv=0xbffffe24) at xfrd.c:1264

(gdb) p i
$2 = 0
(gdb) p pfn_to_mfn_frame_list[i/1024]
$3 = 105128
(gdb) p &pfn_to_mfn_frame_list[i/1024]
$4 = (long unsigned int *) 0xbfffcea0

Anything in particular I should start looking at?

-----
CTO @ Fotango Ltd
+447834716919
http://www.fotango.com/

On 1 Feb 2005, at 17:14, Arthur Bergman wrote:

> And slightly bit more..
>
>
> gdb xfrd
> (gdb) set follow-fork-mode child
> (gdb) run
> Starting program: /usr/sbin/xfrd
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to process 13699]
> 0x40026808 in xc_linux_save () from /usr/lib/libxc.so.2.0
> (gdb) bt
> #0 0x40026808 in xc_linux_save () from /usr/lib/libxc.so.2.0
> #1 0x0804d546 in xen_domain_snd (xend=0xbffffb20, io=0x805fbe0, dom=2,
> vmconfig=0x805f6d8 "(domain (id 2) (name test) (memory 128)
> (maxmem 131072) (state -b---) (cpu 0) (cpu_time 4.030152025) (up_time
> 611.702224016) (start_time 1107281260.96) (console (status listening)
> (id 17) (domain 2) ("..., vmconfig_n=666, live=0, resource=0) at
> xen_domain.c:103
> #2 0x0804befb in xfr_save (args=0x805d87c, state=0xbffffa50,
> xend=0xbffffb20, file=0x805f9b8 "/tmp/bla") at xfrd.c:774
> #3 0x0804c8d3 in xfrd_service (args=0x805d87c, peersock=6, peer_in=
> {sin_family = 2, sin_port = 44292, sin_addr = {s_addr =
> 16777343}, sin_zero = "\000\000\000\000\000\000\000"}) at xfrd.c:950
> #4 0x0804ccf4 in xfrd_accept (args=0x805d87c, sock=2) at xfrd.c:1024
> #5 0x0804ce01 in xfrd_select (args=0x805d87c, listen_sock=2) at
> xfrd.c:1054
> #6 0x0804d0f1 in xfrd_main (args=0x805d87c) at xfrd.c:1210
> #7 0x0804d273 in main (argc=1, argv=0xbffffe24) at xfrd.c:1264
> (gdb)
>
> I guess I am going to need to recompile with debugging on.
>
> Cheers
> Arthur
>
> -----

Re: Cannot save/migrate domains [ In reply to ]

abergman at fotango

Feb 1, 2005, 10:51 AM

Post #5 of 6 (220 views)

Permalink

I realize this monologue might be odd, or maybe tiresome. However I am
trying to resolve this issue so I am digging deeper into the source
code.

Following the code inside the macro, it seems like

(gdb) p live_mfn_to_pfn_table
$13 = (long unsigned int *) 0x0

so the code that does

live_mfn_to_pfn_table[_mfn]

results in

(gdb) p live_mfn_to_pfn_table[mfn]
Cannot access memory at address 0x66aa0

So it seems to me, in my quick look that

live_mfn_to_pfn_table =
xc_map_foreign_range(xc_handle, DOMID_XEN,
PAGE_SIZE*1024, PROT_READ,
mfn_to_pfn_table_start_mfn );

returns 0

which seems to be a ok value for it to return...

cheers
Arthur

-----
CTO @ Fotango Ltd
+447834716919
http://www.fotango.com/

On 1 Feb 2005, at 17:26, Arthur Bergman wrote:

> And now with debugging turned in libcx.so.2.0
>
> 0x40026868 in xc_linux_save (xc_handle=8, ioctxt=0xbffff8f0) at
> xc_linux_save.c:516
> 516 if (
> !translate_mfn_to_pfn(&pfn_to_mfn_frame_list[i/1024]) ){
> (gdb) bt
> #0 0x40026868 in xc_linux_save (xc_handle=8, ioctxt=0xbffff8f0) at
> xc_linux_save.c:516
> #1 0x0804d546 in xen_domain_snd (xend=0xbffffb20, io=0x805fbe0, dom=2,
> vmconfig=0x805f6d8 "(domain (id 2) (name test) (memory 128)
> (maxmem 131072) (state -b---) (cpu 0) (cpu_time 4.059911993) (up_time
> 1064.72708416) (start_time 1107281260.96) (console (status listening)
> (id 17) (domain 2) ("..., vmconfig_n=666, live=0, resource=0) at
> xen_domain.c:103
> #2 0x0804befb in xfr_save (args=0x805d87c, state=0xbffffa50,
> xend=0xbffffb20, file=0x805f9b8 "/tmp/bla") at xfrd.c:774
> #3 0x0804c8d3 in xfrd_service (args=0x805d87c, peersock=6, peer_in=
> {sin_family = 2, sin_port = 44804, sin_addr = {s_addr =
> 16777343}, sin_zero = "\000\000\000\000\000\000\000"}) at xfrd.c:950
> #4 0x0804ccf4 in xfrd_accept (args=0x805d87c, sock=2) at xfrd.c:1024
> #5 0x0804ce01 in xfrd_select (args=0x805d87c, listen_sock=2) at
> xfrd.c:1054
> #6 0x0804d0f1 in xfrd_main (args=0x805d87c) at xfrd.c:1210
> #7 0x0804d273 in main (argc=1, argv=0xbffffe24) at xfrd.c:1264
>
> (gdb) p i
> $2 = 0
> (gdb) p pfn_to_mfn_frame_list[i/1024]
> $3 = 105128
> (gdb) p &pfn_to_mfn_frame_list[i/1024]
> $4 = (long unsigned int *) 0xbfffcea0
>
> Anything in particular I should start looking at?
>
> -----
> CTO @ Fotango Ltd
> +447834716919
> http://www.fotango.com/
>
> On 1 Feb 2005, at 17:14, Arthur Bergman wrote:
>
>> And slightly bit more..
>>
>>
>> gdb xfrd
>> (gdb) set follow-fork-mode child
>> (gdb) run
>> Starting program: /usr/sbin/xfrd
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> [Switching to process 13699]
>> 0x40026808 in xc_linux_save () from /usr/lib/libxc.so.2.0
>> (gdb) bt
>> #0 0x40026808 in xc_linux_save () from /usr/lib/libxc.so.2.0
>> #1 0x0804d546 in xen_domain_snd (xend=0xbffffb20, io=0x805fbe0,
>> dom=2,
>> vmconfig=0x805f6d8 "(domain (id 2) (name test) (memory 128)
>> (maxmem 131072) (state -b---) (cpu 0) (cpu_time 4.030152025) (up_time
>> 611.702224016) (start_time 1107281260.96) (console (status listening)
>> (id 17) (domain 2) ("..., vmconfig_n=666, live=0, resource=0) at
>> xen_domain.c:103
>> #2 0x0804befb in xfr_save (args=0x805d87c, state=0xbffffa50,
>> xend=0xbffffb20, file=0x805f9b8 "/tmp/bla") at xfrd.c:774
>> #3 0x0804c8d3 in xfrd_service (args=0x805d87c, peersock=6, peer_in=
>> {sin_family = 2, sin_port = 44292, sin_addr = {s_addr =
>> 16777343}, sin_zero = "\000\000\000\000\000\000\000"}) at xfrd.c:950
>> #4 0x0804ccf4 in xfrd_accept (args=0x805d87c, sock=2) at xfrd.c:1024
>> #5 0x0804ce01 in xfrd_select (args=0x805d87c, listen_sock=2) at
>> xfrd.c:1054
>> #6 0x0804d0f1 in xfrd_main (args=0x805d87c) at xfrd.c:1210
>> #7 0x0804d273 in main (argc=1, argv=0xbffffe24) at xfrd.c:1264
>> (gdb)
>>
>> I guess I am going to need to recompile with debugging on.
>>
>> Cheers
>> Arthur
>>
>> -----

RE: Cannot save/migrate domains [ In reply to ]

m+Ian.Pratt at cl

Feb 1, 2005, 12:42 PM

Post #6 of 6 (221 views)

Permalink

Please can you try using a debug build of Xen, and try and capture the
full serial console output.

It's rather odd that mapping the mfn_to_pfn table is failing. It would
bne useful to know the value of mfn_to_pfn_table_start_mfn

Thanks,
Ian

> -----Original Message-----
> From: xen-devel-admin@lists.sourceforge.net
> [mailto:xen-devel-admin@lists.sourceforge.net] On Behalf Of
> Arthur Bergman
> Sent: 01 February 2005 17:52
> To: xen-devel@lists.sourceforge.net
> Cc: Fotango Systems
> Subject: Re: [Xen-devel] Cannot save/migrate domains
>
> I realize this monologue might be odd, or maybe tiresome.
> However I am
> trying to resolve this issue so I am digging deeper into the source
> code.
>
> Following the code inside the macro, it seems like
>
> (gdb) p live_mfn_to_pfn_table
> $13 = (long unsigned int *) 0x0
>
> so the code that does
>
> live_mfn_to_pfn_table[_mfn]
>
> results in
>
> (gdb) p live_mfn_to_pfn_table[mfn]
> Cannot access memory at address 0x66aa0
>
> So it seems to me, in my quick look that
>
> live_mfn_to_pfn_table =
> xc_map_foreign_range(xc_handle, DOMID_XEN,
> PAGE_SIZE*1024, PROT_READ,
> mfn_to_pfn_table_start_mfn );
>
>
> returns 0
>
> which seems to be a ok value for it to return...
>
> cheers
> Arthur
>
>
> -----
> CTO @ Fotango Ltd
> +447834716919
> http://www.fotango.com/
>
> On 1 Feb 2005, at 17:26, Arthur Bergman wrote:
>
> > And now with debugging turned in libcx.so.2.0
> >
> > 0x40026868 in xc_linux_save (xc_handle=8, ioctxt=0xbffff8f0) at
> > xc_linux_save.c:516
> > 516 if (
> > !translate_mfn_to_pfn(&pfn_to_mfn_frame_list[i/1024]) ){
> > (gdb) bt
> > #0 0x40026868 in xc_linux_save (xc_handle=8, ioctxt=0xbffff8f0) at
> > xc_linux_save.c:516
> > #1 0x0804d546 in xen_domain_snd (xend=0xbffffb20,
> io=0x805fbe0, dom=2,
> > vmconfig=0x805f6d8 "(domain (id 2) (name test) (memory 128)
> > (maxmem 131072) (state -b---) (cpu 0) (cpu_time
> 4.059911993) (up_time
> > 1064.72708416) (start_time 1107281260.96) (console (status
> listening)
> > (id 17) (domain 2) ("..., vmconfig_n=666, live=0, resource=0) at
> > xen_domain.c:103
> > #2 0x0804befb in xfr_save (args=0x805d87c, state=0xbffffa50,
> > xend=0xbffffb20, file=0x805f9b8 "/tmp/bla") at xfrd.c:774
> > #3 0x0804c8d3 in xfrd_service (args=0x805d87c, peersock=6, peer_in=
> > {sin_family = 2, sin_port = 44804, sin_addr = {s_addr =
> > 16777343}, sin_zero = "\000\000\000\000\000\000\000"}) at xfrd.c:950
> > #4 0x0804ccf4 in xfrd_accept (args=0x805d87c, sock=2) at
> xfrd.c:1024
> > #5 0x0804ce01 in xfrd_select (args=0x805d87c, listen_sock=2) at
> > xfrd.c:1054
> > #6 0x0804d0f1 in xfrd_main (args=0x805d87c) at xfrd.c:1210
> > #7 0x0804d273 in main (argc=1, argv=0xbffffe24) at xfrd.c:1264
> >
> > (gdb) p i
> > $2 = 0
> > (gdb) p pfn_to_mfn_frame_list[i/1024]
> > $3 = 105128
> > (gdb) p &pfn_to_mfn_frame_list[i/1024]
> > $4 = (long unsigned int *) 0xbfffcea0
> >
> > Anything in particular I should start looking at?
> >
> > -----
> > CTO @ Fotango Ltd
> > +447834716919
> > http://www.fotango.com/
> >
> > On 1 Feb 2005, at 17:14, Arthur Bergman wrote:
> >
> >> And slightly bit more..
> >>
> >>
> >> gdb xfrd
> >> (gdb) set follow-fork-mode child
> >> (gdb) run
> >> Starting program: /usr/sbin/xfrd
> >>
> >> Program received signal SIGSEGV, Segmentation fault.
> >> [Switching to process 13699]
> >> 0x40026808 in xc_linux_save () from /usr/lib/libxc.so.2.0
> >> (gdb) bt
> >> #0 0x40026808 in xc_linux_save () from /usr/lib/libxc.so.2.0
> >> #1 0x0804d546 in xen_domain_snd (xend=0xbffffb20, io=0x805fbe0,
> >> dom=2,
> >> vmconfig=0x805f6d8 "(domain (id 2) (name test) (memory 128)
> >> (maxmem 131072) (state -b---) (cpu 0) (cpu_time
> 4.030152025) (up_time
> >> 611.702224016) (start_time 1107281260.96) (console (status
> listening)
> >> (id 17) (domain 2) ("..., vmconfig_n=666, live=0, resource=0) at
> >> xen_domain.c:103
> >> #2 0x0804befb in xfr_save (args=0x805d87c, state=0xbffffa50,
> >> xend=0xbffffb20, file=0x805f9b8 "/tmp/bla") at xfrd.c:774
> >> #3 0x0804c8d3 in xfrd_service (args=0x805d87c,
> peersock=6, peer_in=
> >> {sin_family = 2, sin_port = 44292, sin_addr = {s_addr =
> >> 16777343}, sin_zero = "\000\000\000\000\000\000\000"}) at
> xfrd.c:950
> >> #4 0x0804ccf4 in xfrd_accept (args=0x805d87c, sock=2) at
> xfrd.c:1024
> >> #5 0x0804ce01 in xfrd_select (args=0x805d87c, listen_sock=2) at
> >> xfrd.c:1054
> >> #6 0x0804d0f1 in xfrd_main (args=0x805d87c) at xfrd.c:1210
> >> #7 0x0804d273 in main (argc=1, argv=0xbffffe24) at xfrd.c:1264
> >> (gdb)
> >>
> >> I guess I am going to need to recompile with debugging on.
> >>
> >> Cheers
> >> Arthur
> >>
> >> -----
>

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