munmap() should not fail when mm_struct.map_count temporarily reaches max_map_count
Issue
-
The munmap() syscall fails even if the number of VMAs of a process (mm_struct.map_count) does not yet reach the upper limit (sysctl_max_map_count). The munmap() fails with ENOMEM if the number of VMAs equals the "limit - 1" and it does not unmap a whole VMA but a part of a VMA.
-
In that case, the number of VMAs temporarily reaches the limit during munmap() and it backs to below the limit at the end of munmap(). So it
should not fail.
Environment
- Red Hat Enterprise Linux 5 Update 4
- Red Hat Enterprise Linux 4 Update 8
- ia64
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