perl -d session of F Boers' bug
$c[0][0]=pdl(0,4,2,1);
$c[1][0]=pdl(0,0,1,1);
$c[2][0]=pdl(0,0,0,1);
$c[0][1]=pdl(0,0,3,1);
$c[1][1]=pdl(0,0,2,1);
$c[2][1]=pdl(5,1,1,1);
$d = pdl(@c);
Causes a crash in PDL-2.4.6_008. A preliminary look shows
that the crash happens in the pdl_avref routine. This problem
was reported by Jim Magnuson on the perldl mailing list.
Thanks, Jim!
Chris Marshall
2010-12-08
perl -d session of F Boers' bug
Derek Lamb
2010-12-09
FWIW, I cannot reproduce Frank's problem on the same machine that generated the earlier errors. However, I do have some additional (potentially helpful) output. I #defined DEBUG_SETAV_TYPE and DEBUG_KLUDGE_COPY in Basic/Core/pdlcore.c.PL, and rebuilt. The output of a small variation on my previous test (where now the array to piddleify is (1,2,3,4) is:
@world_coords is 0 0 0 0
It has 4 elements
piddle-ifying @wc
av_ndcheck: depth=0, length is 0; derived dim list is [ ]
pdl_setav_Double: level=0, i=0, pdata=161714584, pdims=(4), ndims=1 Calling pdl_kludge_copy - pdata is 161714584, pdims is (4), ndims is 1, level is 0, stride is 1, pdl->data is 161289808
entering pdl_kludge_copy: level=1, ndims=1, plevel=0; pdl->ndims=0
pdldim_expr=-1, pdldim=0, pdlsiz=1, pdims[0]=4
filled in row: 1 0 0 0
pdl_setav_Double: level=0, i=1, pdata=161714592, pdims=(4), ndims=1 Calling pdl_kludge_copy - pdata is 161714592, pdims is (4), ndims is 1, level is 0, stride is 1, pdl->data is 161680640
entering pdl_kludge_copy: level=1, ndims=1, plevel=0; pdl->ndims=0
pdldim_expr=-1, pdldim=0, pdlsiz=1, pdims[0]=4
filled in row: 2 0 0 0
pdl_setav_Double: level=0, i=2, pdata=161714600, pdims=(4), ndims=1 Calling pdl_kludge_copy - pdata is 161714600, pdims is (4), ndims is 1, level is 0, stride is 1, pdl->data is 161656528
entering pdl_kludge_copy: level=1, ndims=1, plevel=0; pdl->ndims=0
pdldim_expr=-1, pdldim=0, pdlsiz=1, pdims[0]=4
filled in row: 3 0 0 0
pdl_setav_Double: level=0, i=3, pdata=161714608, pdims=(4), ndims=1 Calling pdl_kludge_copy - pdata is 161714608, pdims is (4), ndims is 1, level is 0, stride is 1, pdl->data is 161646424
entering pdl_kludge_copy: level=1, ndims=1, plevel=0; pdl->ndims=0
pdldim_expr=-1, pdldim=0, pdlsiz=1, pdims[0]=4
filled in row: 4 0 0 0
loop is complete. len is 3, cursz-1 is 3, stride is 1
*** glibc detected *** perl: free(): invalid next size (fast): 0x09a39198 ***
(and then the backtrace and memory map dump happen the same as before)
Perhaps more helpful is this simple one-liner:
$ perl -Mblib -MPDL -we 'pdl(3,5,2,4,1,[]);'
av_ndcheck: depth=0, length is 1; derived dim list is [ -1 ]
av_ndcheck: depth=1, length is 1; derived dim list is [ 6 ]
pdl_setav_Double: level=0, i=0, pdata=0, pdims=(0,6), ndims=2 defined scalar element 3
Segmentation fault
If I put a value in that ref at the end, it seems to be OK:
$ perl -Mblib -MPDL -we 'pdl(3,5,2,4,1,[9]);'
av_ndcheck: depth=0, length is 1; derived dim list is [ -1 ]
av_ndcheck: depth=1, length is 1; derived dim list is [ 6 ]
pdl_setav_Double: level=0, i=0, pdata=169060320, pdims=(1,6), ndims=2 defined scalar element 3
Padding: level=0; ndims-1=1. pdata is 169060320, stride is 1, target is 2
pdl_setav_Double: level=0, i=1, pdata=169060328, pdims=(1,6), ndims=2 defined scalar element 5
Padding: level=0; ndims-1=1. pdata is 169060328, stride is 1, target is 2
pdl_setav_Double: level=0, i=2, pdata=169060336, pdims=(1,6), ndims=2 defined scalar element 2
Padding: level=0; ndims-1=1. pdata is 169060336, stride is 1, target is 2
pdl_setav_Double: level=0, i=3, pdata=169060344, pdims=(1,6), ndims=2 defined scalar element 4
Padding: level=0; ndims-1=1. pdata is 169060344, stride is 1, target is 2
pdl_setav_Double: level=0, i=4, pdata=169060352, pdims=(1,6), ndims=2 defined scalar element 1
Padding: level=0; ndims-1=1. pdata is 169060352, stride is 1, target is 2
pdl_setav_Double: level=0, i=5, pdata=169060360, pdims=(1,6), ndims=2 found an array ref -- recursing
pdl_setav_Double: level=1, i=0, pdata=169060360, pdims=(1,6), ndims=2 defined scalar element 9
loop is complete. len is 0, cursz-1 is 0, stride is 1
loop is complete. len is 5, cursz-1 is 5, stride is 1
Chris Marshall
2010-12-09
Derek- The simple one-liner you reported gives a Segmentation fault
(core dumped) on cygwin/XP as well. I hope that is small enough
to help Craig out with the debugging...
Chris Marshall
2011-03-13
I verified that the included examples no longer fail
and that the cygwin issues are fixed as well. I'm
marking this ticket Fixed with status Pending. The
ticket will close in 2 weeks unless further action is
taken.
If you had problems related to this ticket, please
check against the upcoming CHM/PDL-2.4.7_012.tar.gz
developers release to be announced on perldl
shortly.
Thanks.
Chris Marshall
2011-03-13
SourceForge Robot
2011-03-27
This Tracker item was closed automatically by the system. It was
previously set to a Pending status, and the original submitter
did not respond within 14 days (the time period specified by
the administrator of this Tracker).
SourceForge Robot
2011-03-27