Comment 2 for bug 1258732

StacktraceTop:
 sigorset (dest=0x67d, left=0x71c9, right=0x6) at sigorset.c:30
 __GI_qsort_r (b=0x67d, n=29129, s=6, cmp=0xffffffffffffffff, arg=0x0) at msort.c:175
 malloc_printerr (ptr=0x3d39710, str=0x7f621c0ce4c4 "malloc(): memory corruption", action=393216) at malloc.c:4927
 _int_malloc (av=0x3d391d0, bytes=<optimized out>) at malloc.c:3402
 ?? ()