[GRASS-dev] [GRASS GIS] #2337: t.list hangs on newly created temporal DB

[GRASS GIS]

#2337: t.list hangs on newly created temporal DB
-------------------------+--------------------------------------------------
 Reporter:  neteler      |       Owner:  grass-dev@…              
     Type:  defect       |      Status:  new                      
 Priority:  normal       |   Milestone:  7.0.0                    
Component:  Temporal     |     Version:  svn-trunk                
 Keywords:  t.list       |    Platform:  Linux                    
      Cpu:  Unspecified  |  
-------------------------+--------------------------------------------------
 t.list hangs when used on a newly created temporal DB which is still
 empty:

 {{{
 GRASS 7.1.svn (eu_laea):~ > t.list -h
 D1/1: grass.script.core.start_command(): t.connect -c
 D1/1: grass.script.core.start_command(): t.connect -pg
 D1/1: grass.script.core.start_command(): g.gisenv -n
 D1/1: Start messenger server
 D1/1: Initiate the temporal database
 D1/1: SQLDatabaseInterfaceConnection constructor
 D1/1: Start C-interface server
 ----------------------------------------------
 D1/1: SQLDatabaseInterfaceConnection constructor
 }}}

 ... then it hangs. CTRL-C "helps":
 {{{
 ^CProcess Process-2:
 Process Process-1:
 Traceback (most recent call last):
 Traceback (most recent call last):
   File "/usr/lib64/python2.6/multiprocessing/process.py", line 232, in
 _bootstrap
   File "/usr/lib64/python2.6/multiprocessing/process.py", line 232, in
 _bootstrap
     self.run()
     self.run()
   File "/usr/lib64/python2.6/multiprocessing/process.py", line 88, in run
   File "/usr/lib64/python2.6/multiprocessing/process.py", line 88, in run
     self._target(*self._args, **self._kwargs)
     self._target(*self._args, **self._kwargs)
   File
 "/usr/local/grass-7.1.svn/etc/python/grass/temporal/c_libraries_interface.py",
 line 644, in c_library_server
   File
 "/usr/local/grass-7.1.svn/etc/python/grass/pygrass/messages/__init__.py",
 line 73, in message_server
     conn.poll(None)
 KeyboardInterrupt
     functions[data[0]](lock, conn, data)
   File
 "/usr/local/grass-7.1.svn/etc/python/grass/temporal/c_libraries_interface.py",
 line 65, in available_mapsets
     if libgis.G__mapset_permissions(mapset) > 0:
 KeyboardInterrupt
 Traceback (most recent call last):
   File "/usr/local/grass-7.1.svn/scripts/t.list", line 157, in <module>
     main()
   File "/usr/local/grass-7.1.svn/scripts/t.list", line 111, in main
     stds_list = tgis.get_dataset_list(type,  ttype,  columns,  where,
 order)
   File "/usr/local/grass-7.1.svn/etc/python/grass/temporal/list_stds.py",
 line 73, in get_dataset_list
     mapsets = get_tgis_c_library_interface().available_mapsets()
   File
 "/usr/local/grass-7.1.svn/etc/python/grass/temporal/c_libraries_interface.py",
 line 1088, in available_mapsets
     return self.client_conn.recv()
 KeyboardInterrupt
 }}}

 Using strace:
 {{{
 strace t.list -h
 ...
 D1/1: SQLDatabaseInterfaceConnection constructor
 stat("/grassdata/eu_laea/PERMANENT/tgis/sqlite.db", {st_mode=S_IFREG|0644,
 st_size=159744, ...}) = 0
 open("/grassdata/eu_laea/PERMANENT/tgis/sqlite.db", O_RDWR|O_CREAT, 0644)
 = 3
 fcntl(3, F_GETFD)                       = 0
 fcntl(3, F_SETFD, FD_CLOEXEC)           = 0
 fstat(3, {st_mode=S_IFREG|0644, st_size=159744, ...}) = 0
 lseek(3, 0, SEEK_SET)                   = 0
 read(3, "SQLite format 3\0\4\0\1\1\0@  \0\0\0X\0\0\0\0"..., 100) = 100
 fcntl(3, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741824,
 len=1}) = 0
 fcntl(3, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741826,
 len=510}) = 0
 fcntl(3, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=1073741824,
 len=1}) = 0
 access("/grassdata/eu_laea/PERMANENT/tgis/sqlite.db-journal", F_OK) = -1
 ENOENT (No such file or directory)
 fstat(3, {st_mode=S_IFREG|0644, st_size=159744, ...}) = 0
 lseek(3, 0, SEEK_SET)                   = 0
 read(3, "SQLite format 3\0\4\0\1\1\0@  \0\0\0X\0\0\0\0"..., 1024) = 1024
 lseek(3, 5120, SEEK_SET)                = 5120
 read(3,
 "\r\0\0\0\1\0\376\0\0\376\3\305\0z\0z\0\0\0\0\0\0G\4\6\27[5\1\0in"...,
 1024) = 1024
 lseek(3, 6144, SEEK_SET)                = 6144
 read(3,
 "\r\0\0\0\3\1\201\0\1\201\1\270\3\267\0014\0014\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
 1024) = 1024
 ...
 read(3,
 "\r\0\0\0\6\0\300\0\0\300\1G\1\312\2/\2\320\3q\3u\0\0\0\0\0\0\0\0\0\0"...,
 1024) = 1024
 lseek(3, 149504, SEEK_SET)              = 149504
 read(3,
 "\r\0\0\0\5\1_\0\1_\1\352\2G\2\340\3y\3\212\0\203\0\0\0\0\0\0\0\0\0\0"...,
 1024) = 1024
 lseek(3, 157696, SEEK_SET)              = 157696
 read(3,
 "\r\0\0\0\5\1\301\0\2+\2\256\3$\3\222\1\301\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
 1024) = 1024
 fcntl(3, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) = 0
 wait4(11171, 0x7fff6df96024, WNOHANG, NULL) = 0
 write(7, "\0\0\0\t\200\2]q\1K\10a.", 13) = 13
 read(7,
 }}}

 It is polling for something unknown...

-- 
Ticket URL: <http://trac.osgeo.org/grass/ticket/2337>
GRASS GIS <http://grass.osgeo.org>