Am 15.12.20 um 23:00 schrieb Mack Stanley:
Dear Bernhard,
Thanks so much for your interest and your message. I very recently
realized that my bug report is in error and hoped that I would be
able to correct or withdraw it before troubling anyone.
Here is how to reproduce the segfault I observed (in wither 32 or 64
bit debian a2ps):
Near the top of /etc/a2ps-site.cfg comment out one or both of the lines
_____
Options: --encoding=latin1
Options: --medium=libpaper
_____
Then just execute
a2ps
The result will be a crash with simply
Segmentation Fault
-------
I am very sorry to have filed a false bug report. I had tried two 32
bit installations and one 64 bit. Evidently I made the same mistake
in both 32 bit installations: I must have installed with an old
Fedora a2ps-site.cfg already in /etc/ , which the Debian installation
politely refused to overwrite. The default Fedora a2ps-site.cfg has
those two lines as
#Options: --encoding=latin1
Options: --medium=_glibc
After removing "#" from the first line, the debian build a2ps
complains helpfully about the second line. But with the "#" it just
segfaults.
I am sorry it took me so long to find this mistake. It wasn't till I
built 32 bit a2ps from the GNU source that I saw the problem
(http://ftp.gnu.org/gnu/a2ps/a2ps-4.14.tar.gz./configure
--prefix=/usr --with-gnu-gettext --with-medium=letter ).
It would be nice if a2ps itself had been more forthcoming about my
mistake rather than segfaulting. But it was just that---my mistake.
Again, my apologies for wasting your time and my thanks for your
interest.
Best regards, Mack
Hello Mack,
no problem, with these great details I could collect these backtraces:
# With: #Options: --encoding=latin1
(gdb) bt
#0 __strlen_sse2_bsf () at
../sysdeps/i386/i686/multiarch/strlen-sse2-bsf.S:50
#1 0x0050bfcc in strlower (string=0x0) at routines.c:95
#2 0x005096cd in get_encoding_by_alias (job=0x57bc50, alias=0x0)
at encoding.c:1207
#3 0x0050aa50 in a2ps_job_finalize (job=0x57bc50) at jobs.c:305
#4 0x004ef980 in main (argc=<optimized out>, argv=<optimized
out>) at main.c:1025
(gdb)
# With: #Options: --medium=libpaper
(gdb) bt
#0 __strcasecmp_l_sse4_2 () at
../sysdeps/i386/i686/multiarch/strcmp-sse4.S:229
#1 0x0050e22a in a2ps_get_medium (job=0xb1ec50, name=0x0) at
media.c:164
#2 0x0050ea6c in a2ps_job_finalize (job=0xb1ec50) at jobs.c:312
#3 0x004f3980 in main (argc=<optimized out>, argv=<optimized
out>) at main.c:1025
(gdb)
As you mentioned some relation to fedora I made a short
search and it looks like there are some patches used,
which are not yet upstreamed.
https://src.fedoraproject.org/rpms/a2ps/tree/
https://git.savannah.gnu.org/cgit/a2ps.git/log/
Especially the a2ps-4.13b-encoding.patch and
a2ps-4.13-glibcpaper.patch seem related.
Kind regards,
Bernhard
apt install systemd-coredump gdb a2ps a2ps-dbgsym
zcat /usr/share/doc/a2ps/README.gz | a2ps
coredumpctl list
coredumpctl gdb 2478
https://sources.debian.org/src/a2ps/1:4.14-5/lib/jobs.c/#L305