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VM bugfix & regression test

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The bug in the offset correction code for the 'shrink region from
below' case can easily case an assert(foundregion->offset == offset)
to trigger (if the blocks are touched afterwards, e.g. on fork())
as the offsets become wrong. This commit is a fix & regression test.

Change-Id: I28ed403e3891362a2dea674a49e786d3450d2983
This commit is contained in:
Ben Gras
2014-01-08 17:43:19 +01:00
committed by Gerrit Code Review
parent 502bc37a61
commit 274fdff60c
2 changed files with 21 additions and 3 deletions
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17
test/test74.c
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@@ -75,6 +75,21 @@ readblock(int b, int blocksize, u32_t seed, char *data)
void testend(void) { }
void basic_regression(void)
{
void *block;
#define BLOCKSIZE (PAGE_SIZE*10)
block = minix_mmap(0, BLOCKSIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if(block == MAP_FAILED) { e(1); exit(1); }
memset(block, 0, BLOCKSIZE);
/* shrink from bottom */
minix_munmap(block, PAGE_SIZE);
}
int
main(int argc, char *argv[])
{
@@ -82,6 +97,8 @@ main(int argc, char *argv[])
start(74);
basic_regression();
makefiles(MAXFILES);
cachequiet(!bigflag);