In upgrading to kexec-tools 2.0.5 I first got the error "Overlapping
memory segments at 0xbeff000"
Adding some debugging I found locate_hole was returning incorrect
values. The below is from the debug I added:
XXXMDF: look for hole size 100000, cur range [52b3000, bffffff] size 6d4cfff
XXXMDF: look for hole memsz=100000, found beff000
Hmm, if we wanted 0x100000 bytes ending at 0xbffffff, that should be
0xbf00000, not 0xbef000. Continuing to the second invocation:
XXXMDF: look for hole size 1000, cur range [52b3000, befefff] size 6c4bfff
XXXMDF: look for hole size 1000, cur range [bfff000, bffffff] size fff
XXXMDF: look for hole memsz=1000, found bffe000
Now we die with overlapping ranges, since the 0x100000 bytes at
0xbeff000 overlaps 0x1000 bytes at 0xbffe000.
The attached patch fixes the off-by-one that causes the later overlap.
Thanks,
matthew
--- kexec.c.orig 2014-03-03 16:08:53.289844106 -0800
+++ kexec.c 2014-03-03 16:09:04.960844107 -0800
@@ -272,17 +272,17 @@ unsigned long locate_hole(struct kexec_i
}
/* Is there enough space left so we can use it? */
size = end - start;
if (!hole_size || size >= hole_size - 1) {
if (hole_end > 0) {
hole_base = start;
break;
} else {
- hole_base = _ALIGN_DOWN(end - hole_size,
+ hole_base = _ALIGN_DOWN(end - hole_size + 1,
hole_align);
}
}
}
free(mem_range);
if (hole_base == ULONG_MAX) {
fprintf(stderr, "Could not find a free area of memory of "
"0x%lx bytes...\n", hole_size);
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