Hi.
Testing Judy library (for Judy PHP extension), I encounter a
reproducable segfault on x86_64 only (Judy 1.0.5 official release, no
patch applied).
See the reproducer attached (segfault with value ~300)
$ gdb foo
(gdb) run 500
...
OK - bit successfully set at 269
OK - bit successfully set at 270
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7db4590 in j__udyInsWalk (Pjp=Pjp@entry=0x603198,
Index=Index@entry=271, Pjpm=Pjpm@entry=0x603060) at Judy1Set.c:1506
1506 JU_BITMAPSETL(Pjlb, Pjp->jp_1Index[offset]);
(gdb) bt
#0 0x00007ffff7db4590 in j__udyInsWalk (Pjp=Pjp@entry=0x603198,
Index=Index@entry=271, Pjpm=Pjpm@entry=0x603060) at Judy1Set.c:1506
#1 0x00007ffff7db4fb6 in j__udyInsWalk (Pjp=0x603198,
Pjp@entry=0x603108, Index=Index@entry=271, Pjpm=Pjpm@entry=0x603060) at
Judy1Set.c:1650
#2 0x00007ffff7db4fb6 in j__udyInsWalk (Pjp=0x603108,
Pjp@entry=0x603068, Index=Index@entry=271, Pjpm=Pjpm@entry=0x603060) at
Judy1Set.c:1650
#3 0x00007ffff7db7388 in Judy1Set (PPArray=0x7fffffffdea8, Index=271,
PJError=0x7fffffffde80) at Judy1Set.c:1847
#4 0x000000000040097e in main ()
Have you already encounter this issue ?
Any idea ?
Thanks,
Remi.
CC to Paul (Fedora package owner) and Nicolas (PECL extension owner).
P.S. https://bugzilla.redhat.com/1017338 - fedora bug report
#include <stdio.h>
#include <Judy.h>
int main(int argc, char *argv[]) // Example program of Judy1 macro APIs
{
Word_t Index; // index (or key)
Word_t Rcount; // count of indexes (or bits set)
Word_t Rc_word; // full word return value
int Rc_int, max; // boolean values returned (0 or 1)
Pvoid_t J1Array = (Pvoid_t) NULL; // initialize Judy1 array
max = (argc>1 ? atoi(argv[1]) : 10);
for (Index=1 ; Index<max ; Index++) {
J1S(Rc_int, J1Array, Index);
if (Rc_int == JERR) printf("ERRMEM\n");
if (Rc_int == 1) printf("OK - bit successfully set at %lu\n", Index);
if (Rc_int == 0) printf("BUG - bit already set at %lu\n", Index);
}
J1C(Rcount, J1Array, 0, -1); // count all bits set in array
printf("%lu bits set in Judy1 array\n", Rcount);
J1MU(Rc_word, J1Array); // how much memory was used?
printf("%lu Indexes used %lu bytes of memory\n", Rcount, Rc_word);
Index = 0;
J1F(Rc_int, J1Array, Index); // find first bit set in array
if (Rc_int == 1) printf("OK - first bit set is at %lu\n", Index);
if (Rc_int == 0) printf("BUG - no bits set in array\n");
return(0);
}
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