Why shared memory can not be released by "ipcrm" command ?

Issue

• Why shared memory can not be released by "ipcrm" command ?
• How to remove shared memory segment ?
• What is the meaning of the "dest" seen under status from the output of the "ipcs -m" command ?

Eg:

• The shared memory segment (4685833) is marked to be destroyed on the system.

# ipcs -m
------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status      
0x74000157 3473408    root      600        4          0                       
0x7400012d 4161537    root      600        4          0                       
0x74000190 851970     root      600        4          0                       
0x00000000 4521987    root      644        80         2                       
0x7400012c 4128772    root      600        4          0                       
0x00000000 4554757    root      644        16384      2                       
0x00000000 4587526    root      644        280        2                       
0x00000000 4620295    root      644        64         2          dest         
0x00000000 4653064    root      644        16384      2          dest         
0x00000000 4685833    root      644        280        2          dest         

• Tried to remove shared memory segment with shmid (4685833) using ipcrm command.

# ipcrm -m 4685833

• The shared memory segment with shmid (4685833) still present.

# ipcs -m
------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status      
0x74000157 3473408    root      600        4          0                       
0x7400012d 4161537    root      600        4          0                       
0x74000190 851970     root      600        4          0                       
0x00000000 4521987    root      644        80         2          dest         
0x7400012c 4128772    root      600        4          0                       
0x00000000 4554757    root      644        16384      2                       
0x00000000 4587526    root      644        280        2                       
0x00000000 4620295    root      644        64         2          dest         
0x00000000 4653064    root      644        16384      2          dest         
0x00000000 4685833    root      644        280        2          dest