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I discover many undetached shared memory with key 0x0000000 with ipcs like these:

0x00000000 585728074  nobody     777        48         0                       
0x00000000 585760843  nobody     777        48         0                       
0x00000000 586711116  nobody     777        48         0                       
0x00000000 586743885  nobody     777        48         0                       
0x00000000 587104334  nobody     777        48         0                       
0x00000000 587137103  nobody     777        48         0                       
0x00000000 587694160  nobody     777        48         0                       
0x00000000 587726929  nobody     777        48         0                       
0x00000000 588087378  nobody     777        48         0                       
0x00000000 588120147  nobody     777        48         0                       
0x00000000 588480596  nobody     777        48         0                       
0x00000000 588513365  nobody     777        48         0                       
0x00000000 588742742  nobody     777        48         0                       
0x00000000 588775511  nobody     777        48         0                       
0x00000000 588939352  nobody     777        48         0                       
0x00000000 588972121  nobody     777        48         0                       
0x00000000 589135962  nobody     777        48         0                       
0x00000000 589168731  nobody     777        48         0                       
0x00000000 589791324  nobody     777        48         0                       
0x00000000 589824093  nobody     777        48         0                       
0x00000000 589987934  nobody     777        48         0

It is quite strange because the value of nattach parameters are all 0, which means no process is attaching to them and they should be deleted in this case.

What am I missing? I don't know which process causes this. Is there any way to find out?

shellter
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Eric Zheng
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  • Have you created the shared memory segments and not deleted them? – saai63 Aug 29 '20 at 17:55
  • @saai63. Suppose we don't delete the shms we have created, then it should only have shms corresponding to those keys. Why with `0x00000000` key? – atuly Mar 02 '21 at 02:32
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    @atuly: They were probably created with key as IPC_PRIVATE and hence the keys are 0x00000000 – saai63 Mar 02 '21 at 15:03

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