1 // This test-case exposes a bug that was present in the compressed V bit 2 // handling for a while. The problem was that when 3 // copy_address_range_state() copied a VA_BITS2_OTHER value, it failed to 4 // also copy the corresponding entry in the sec-V-bits table. Then later on 5 // when we searched for the sec-V-bits entry for the copied-to location, it 6 // failed to find it: 7 // 8 // Memcheck: mc_main.c:766 (get_sec_vbits8): Assertion 'n' failed. 9 // Memcheck: get_sec_vbits8: no node for address 0x4017440 (0x4017441) 10 11 #include <stdlib.h> 12 13 int main(void) 14 { 15 int i, t = 0; 16 char* x = malloc(1000); 17 18 // Write some PDBs (partially defined bytes) 19 for (i = 0; i < 1000; i++) 20 x[i] &= (i & 0xff); 21 22 // realloc them, invoking copy_address_range_state() 23 x = realloc(x, 10000); 24 25 // Read the PDBs -- this caused a sec-V-bits lookup failure. 26 for (i = 0; i < 1000; i++) 27 t += x[i]; 28 29 __asm__ __volatile__ ("" :: "r"(t)); 30 31 return 0; 32 } 33 34
