From https://sourceforge.net/p/pdl/bugs/379/

In PDL-2.00716:

pdl> random(10)->average(1) for (0..100)
#average doesn't take an argument, but at least ignores it.

pdl> random(10)->qsort(1) for (0..100)
Segmentation fault: 11

I've also gotten:

pdl> random(10)->qsort(1) for (0..100)
perl(88949,0x7fff76629300) malloc: *** error for object 0x7f918384b918: incorrect checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6

It doesn't happen every time, which is why I put the postfix for() on there. Sometimes I change the for() range and that makes the segfault happen.

I see this present in 2.006 as well.

Loaded PDL v2.006 (supports bad values)
pdl> random(10)->qsort(1) for (0..100)
pdl> random(10)->qsort(1) for (0..100)
pdl> random(10)->qsort(1) for (0..100)
pdl> random(10)->qsort(1) for (0..100)
pdl> random(10)->qsort(1) for (0..100)
pdl> random(10)->qsort(1) for (0..1000)
DUMPING 0x7ffe1bfc4720     datatype: 0
   State: (503564880) DATAFLOW_F|NOMYDIMS|DONTTOUCHDATA|HDRCPY|TRACEDEBUG
Segmentation fault: 11

perldl -V attached for 2.00716.