shm bugs revisited (2)

[Christoph Rohland]

Hi Ingo,

running 2.3.{40,41-pre2}+smp-41-A1 is see inconsistent data when using
shm (2.3.39 seems to be o.K.):

#./ipctst 10 666400000 10 30 20     
using 10 segs of size 666400000 (1073741824 iterations)
started process 613
started process 614
started process 615
started process 616
started process 617
started process 618
started process 619
started process 620
started process 621
[1]+  Stopped                 ./ipctst 10 666400000 10 30 20
# bg
[1]+ ./ipctst 10 666400000 10 30 20 &
# vmstat 5
   procs                      memory    swap          io     system         cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
 5  5  0      0 3727000   2920 660540   0   0     0    16   14  2040   2  64  34
 8  2  0      0 2695244   2920 660540   0   0     0     0  108 86202   1  77  21
 8  2  0      0 2421536   2920 660540   0   0     0     2  109 78954   3  82  14
 8  2  0      0 1364432   2920 660540   0   0     0     0  110 85627   2  79  20
 6  4  0      0 992728   2920 660540   0   0     0     0  106 97082   2  72  26
 7  3  0      0 992728   2920 660540   0   0     0     0  108 93364   4  72  23
 7  3  0      0 3122360   2920 660540   0   0     0     0  112 79578   3  71  26
shmctl IPC_RMID: Invalid argument
 6  4  0      0 2594368   2920 660540   0   0     0     0  133 117693   2  69  2
9
 7  3  0      0 1602924   2920 660540   0   0     0     0  108 73181   1  88  11
n=3, m = 384: 228 != 227, 228, 229, 229, 229, 229
n=3, m = 384: 210 != 209, 210, 211, 212, 212, 212
n=3, m = 384: 185 != 184, 185, 185, 185, 185, 185
n=3, m = 384: 192 != 191, 192, 192, 192, 192, 192
shmctl IPC_RMID: Invalid argument
shmctl IPC_RMID: Invalid argument
10  0  0      0 2925840   2920 660540   0   0     0     0  126 87749   4  89   7

When doing these stress tests I also see random SEGV's on other
programs like vmstat.

Greetings
		Christoph

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