At 04:40 AM 2/16/2006, Shigeharu TAKENO wrote:
In <[EMAIL PROTECTED]>,
Julius Smith <[EMAIL PROTECTED]> wrote:
|
| > /usr/bin/ppmquant -floyd 256 </tmp/l2h16891/p17166.pnm |
/usr/bin/pnmtopng -interlace >! img577.png
| ...
| pnmremap failed, rc=13
| Segmentation fault
This seems to be an error of pnmtopng (13 = SIGPIPE). Please
check pnmtopng. My pnmtopng of netpbm-10.30 also does not run
correctly, so I am now using it of netpbm-10.26 (on Solaris 9).
Apparently pnmtopng (from netpbm-10.31) gets a random segmentation
fault, even when not reading a pipe:
> pnmquant 256 < /tmp/l2h1789/p5124.pnm > foo.pnm
> /usr/bin/pnmtopng -interlace < foo.pnm >! img3356.png
pnmtopng: 16 colors found
> /usr/bin/pnmtopng -interlace < foo.pnm >! img3356.png
pnmtopng: 16 colors found
> /usr/bin/pnmtopng -interlace < foo.pnm >! img3356.png
Segmentation fault
> /usr/bin/pnmtopng -interlace < foo.pnm >! img3356.png
pnmtopng: 16 colors found
> /usr/bin/pnmtopng -interlace < foo.pnm >! img3356.png
Segmentation fault
> /usr/bin/pnmtopng -interlace < foo.pnm >! img3356.png
Segmentation fault
> /usr/bin/pnmtopng -interlace < foo.pnm >! img3356.png
pnmtopng: 16 colors found
> /usr/bin/pnmtopng -interlace < foo.pnm >! img3356.png
pnmtopng: 16 colors found
That's three segmentation faults in eight trials.
I ran it under gdb and found that the crash is in rawmemchr() from
/lib/libc.so.6:
> gdb /usr/bin/pnmtopng
(gdb) set args -interlace < foo.pnm >! img3356.png
(gdb) r
Starting program: /usr/bin/pnmtopng -interlace < foo.pnm >! img3356.png
Reading symbols from shared object read from target memory...(no
debugging symbols found)...done.
Loaded system supplied DSO at 0xf50000
(no debugging symbols found) ...
Program received signal SIGSEGV, Segmentation fault.
0x0088a6b0 in rawmemchr () from /lib/libc.so.6
Recompiling for debugging with "-O0 -g" made the problem go away
completely. It appears turning off optimization (normally "-O3")
makes the problem go away. The next step is to compile "-g -O3" and
track down the bug, but at least there seems to be a workaround for
now. I've now converted several hundred images without a single failure.
Julius
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