[Bug 1518597] Re: All system menus, as well as dolphin and other apps totally unreadable because of overlap

[Chris Bertin]

OK, major progress in isolating this issue, at least the root cause.
Culprit is java and the fact that it now creates thousands of shared
memory segments, for some reason (I am not running any java app I have
not been running for months or years but I did rebuild one using the
latest jdk). The messed up display issue arises when all shmem segments
are busy. All of them have a zero key, some of them claim to have 1 and
other 2 processes attached. Most but not all of them have the same size:

$ ipcs -m
...
0x00000000 86018571   chrisb     600        42864      1          dest         
0x00000000 86051340   chrisb     600        91200      1          dest         
0x00000000 86084109   chrisb     600        91200      1          dest         
0x00000000 86149646   chrisb     600        42864      1          dest         
0x00000000 86182415   chrisb     600        42864      1          dest         
0x00000000 86215184   chrisb     600        236400     1          dest
...         
0x00000000 135040993  chrisb     600        1690076    1          dest         
0x00000000 135073762  chrisb     600        1690076    1          dest         
0x00000000 135106531  chrisb     600        1690076    1          dest         
0x00000000 135139300  chrisb     600        1690076    1          dest         
0x00000000 135172069  chrisb     600        1690076    1          dest         
0x00000000 135204838  chrisb     600        1690076    1          dest         
0x00000000 135237607  chrisb     600        1690076    1          dest         
0x00000000 135270376  chrisb     600        1690076    1          dest         
0x00000000 135303145  chrisb     600        1690076    1          dest         
0x00000000 135335914  chrisb     600        1690076    1          dest         
0x00000000 135368683  chrisb     600        1690076    1          dest         
0x00000000 135401452  chrisb     600        1690076    1          dest         
0x00000000 135434221  chrisb     600        1690076    1          dest         
0x00000000 135466990  chrisb     600        1690076    1          dest         
0x00000000 135499759  chrisb     600        1690076    1          dest         
0x00000000 135532528  chrisb     600        1690076    1          dest         
0x00000000 135565297  chrisb     600        1690076    1          dest         
0x00000000 135598066  chrisb     600        1690076    1          dest         
0x00000000 135630835  chrisb     600        1690076    1          dest         
0x00000000 135663604  chrisb     600        1690076    1          dest         
0x00000000 135696373  chrisb     600        1690076    1          dest         
0x00000000 135729142  chrisb     600        1690076    1          dest         
0x00000000 135761911  chrisb     600        1690076    1          dest         
0x00000000 135794680  chrisb     600        1690076    1          dest         
0x00000000 135827449  chrisb     600        1690076    1          dest         
0x00000000 135860218  chrisb     600        1690076    1          dest         
0x00000000 135892987  chrisb     600        1690076    1          dest         
0x00000000 135925756  chrisb     600        1690076    1          dest         
0x00000000 135958525  chrisb     600        1690076    1          dest         
0x00000000 135991294  chrisb     600        1690076    1          dest         
0x00000000 136024063  chrisb     600        1690076    1          dest         
...

$ ipcs -ml

------ Shared Memory Limits --------
max number of segments = 4096
max seg size (kbytes) = 32768
max total shared memory (kbytes) = 8388608
min seg size (bytes) = 1

When 'ipcs -m | wc -l' shows 4100 lines, the display messes up. Killing
the java processes frees up all the shmem segments.

$ ipcs -m | wc -l
26

Overlap issues go away.

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Title:
  All system menus, as well as dolphin and other apps totally unreadable
  because of overlap

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