[Pkg-phototools-devel] Bug#1007234: Test suite fails on all but amd64 arches

[Mathieu Malaterre]

Bryan,

On Sat, Mar 26, 2022 at 2:00 AM Bryan Henderson <bryanh at giraffe-data.com> wrote:
>
> I don't know familiar you are with debuggers, C, or C arithmetic, so I'm
> attaching a diagnostic version of the program and will also explain where I
> think the problem lies in case you want to investigate on your own.
>
> If you put this .c file in converter/other/pnmtopalm/ and rebuild and run the
> 'palmtopnm' executable that results, it should detect the failure and write
> some useful diagnostic messages.  Tell me what happens.

Thanks !

Here is what I see on my local riscv64/chroot

== palm-roundtrip.test ==
pamdepth: promoting from black and white to grayscale
palmtopnm: Invalid Palm image input.  Header says 30 bytes per row
after uncompressing from 8-bit Packbits, but we counted 4294967069
bytes in a row, before we stopped processing the row
pnmcolormap: making histogram...
pnmcolormap: Scanning image 0
pnmcolormap: 20314 colors so far
pnmcolormap: 20314 colors found
pnmcolormap: choosing 256 colors...
pnmremap: 256 colors found in colormap
palmtopnm: Invalid Palm image input.  Header says 228 bytes per row
after uncompressing from 8-bit Packbits, but we counted 4294967044
bytes in a row, before we stopped processing the row
palm-roundtrip.test: FAILURE


Pay attention that I cannot do any kind of gdb locally:

 % gdb ./converter/other/pnmtopalm/palmtopnm
[...]
(gdb) r
Starting program:
/home/mathieu/debian/netpbm/converter/other/pnmtopalm/palmtopnm
warning: Could not trace the inferior process.
warning: ptrace: Function not implemented
During startup program exited with code 127.


>
> The problem is in function 'readPackBitsRow16'.  The variable 'j' is getting
> too large -- absurdly large, apparently because a bit code that is supposed to
> encode a negative signed integer is being interpreted as a positive unsigned
> one somewhere.  It should not be hard to pinpoint where the arithmetic is
> generating such a a large number.
>
> --
> Bryan Henderson                                   San Jose, California