[sheepdog] collie snapshot rollback cause the image unusable/undeletable

[Wenhao Xu]

Hi all,

I did a snapshot rollback experiment by executing the following steps.
After all these steps, segment fault occurred when executing 'collie tree'.

$ collie vdi create  img1 2G

$ collie vdi list
  Name        Id    Size    Used  Shared    Creation time   VDI id  Copies
 Tag
  img1         1  2.0 GB  0.0 MB  0.0 MB 2013-03-06 21:39   9e028f     1

$ collie vdi snapshot -s snap1 img1

$ collie vdi snapshot -s snap2 img1

$ collie vdi tree
img1---[2013-03-06 21:39]---[2013-03-06 21:39]---(you are here)

$ collie vdi rollback -s snap1 img1

$ collie vdi tree
img1---[2013-03-06 21:39]-+-[2013-03-06 21:39]
                          `-(you are here)

$ collie vdi list
  Name        Id    Size    Used  Shared    Creation time   VDI id  Copies
 Tag
s img1         1  2.0 GB  0.0 MB  0.0 MB 2013-03-06 21:39   9e028f     1
      snap1
s img1         2  2.0 GB  0.0 MB  0.0 MB 2013-03-06 21:39   9e0290     1
      snap2
  img1         3  2.0 GB  0.0 MB  0.0 MB 2013-03-06 21:40   9e0291     1


$ collie vdi rollback -s 3 img1     #This step cause the problem, Am I
doing something wrong? If this is not allowed, collie should probably
prevent the command executing.

$ collie vdi tree
Segmentation fault (core dumped)

The worse thing is the volume cannot be deleted afterwards.

 collie vdi delete -s 1 img1
 collie vdi delete -s 2 img1

works fine.

But collie vdi delete  img1 just hung forever.

The log shows sheep falls into a dead loop:

<endless>
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170902] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170903] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170904] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170905] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170906] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170907] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170908] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170909] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170910] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170911] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170912] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170913] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170914] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170915] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170916] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170917] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170918] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170919] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170920] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170921] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170922] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170923] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170924] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170925] do_process_work(1258) 2, 809e029100000000, 1
Mar 06 21:55:29 [main] queue_request(355) READ_OBJ, 1
Mar 06 21:55:29 [gway 170926] do_process_work(1258) 2, 809e029100000000, 1
</endless>

This seems a severe bug. Hopefully it is not hard to solve. ;) Thanks.

Regards,
Wenhao
-- 
~_~
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