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// This test-case exposes a bug that was present in the compressed V bit
// handling for a while. The problem was that when
// copy_address_range_state() copied a VA_BITS2_OTHER value, it failed to
// also copy the corresponding entry in the sec-V-bits table. Then later on
// when we searched for the sec-V-bits entry for the copied-to location, it
// failed to find it:
//
// Memcheck: mc_main.c:766 (get_sec_vbits8): Assertion 'n' failed.
// Memcheck: get_sec_vbits8: no node for address 0x4017440 (0x4017441)
#include <stdlib.h>
int main(void)
{
int i, t = 0;
char* x = malloc(1000);
// Write some PDBs (partially defined bytes)
for (i = 0; i < 1000; i++)
x[i] &= (i & 0xff);
// realloc them, invoking copy_address_range_state()
x = realloc(x, 10000);
// Read the PDBs -- this caused a sec-V-bits lookup failure.
for (i = 0; i < 1000; i++)
t += x[i];
__asm__ __volatile__ ("" :: "r"(t));
return 0;
}
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