Package: advi Version: 1.6.0-13+b2 Severity: normal When trying to open the attached .dvi file (generated by processing the attached tex file with LaTeX) advi freezes (does not answer to commands, but does not take 100% of the CPU either). xdvi displays it fine.
The state during the freeze seems to be that advi launches a gs that
waits for input (blocks on "read(0, ...)" while advi itselfs loops on:
--- SIGALRM (Alarm clock) @ 0 (0) ---
rt_sigprocmask(SIG_BLOCK, [ALRM], [PIPE ALRM], 8) = 0
read(3, 0x20326d4, 4096) = -1 EAGAIN (Resource temporarily
unavailable)
read(3, 0x20326d4, 4096) = -1 EAGAIN (Resource temporarily
unavailable)
setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0, 249999}},
{it_interval={0, 0}, it_value={0, 0}}) = 0
setitimer(ITIMER_REAL, {it_interval={0, 0}, it_value={0, 249938}},
{it_interval={0, 0}, it_value={0, 249940}}) = 0
rt_sigreturn(0x2) = -1 EINTR (Interrupted system call)
read(6, 0x203ac40, 4096) = ? ERESTARTSYS (To be restarted)
--- SIGALRM (Alarm clock) @ 0 (0) ---
Here are the open files:
advi 6936 lionelm 0u CHR 136,2 4 /dev/pts/2
advi 6936 lionelm 1u CHR 136,2 4 /dev/pts/2
advi 6936 lionelm 2u CHR 136,2 4 /dev/pts/2
advi 6936 lionelm 3u unix 0xffff81001b30b940 93665 socket
advi 6936 lionelm 4r FIFO 0,6 93667 pipe
advi 6936 lionelm 5w FIFO 0,6 93667 pipe
advi 6936 lionelm 6r FIFO 0,6 93668 pipe
advi 6936 lionelm 7w FIFO 0,6 93668 pipe
gs 6939 lionelm 0r FIFO 0,6 93667 pipe
gs 6939 lionelm 1w FIFO 0,6 93668 pipe
gs 6939 lionelm 2u CHR 136,2 4 /dev/pts/2
gs 6939 lionelm 4u unix 0xffff81001b381180 93681 socket
gs 6939 lionelm 5w FIFO 0,6 93667 pipe
gs 6939 lionelm 6r FIFO 0,6 93668 pipe
(This, by the way, suggests that advi fails to close fd 5 and 6, the
pipe it has set up to communicate with gs, before exec()'ing gs. This
in turn leads to gs surviving advi: it does not get SIGPIPE because
there is a program (itself) that has the same pipe open for writing
so the kernel has hope that the read(0, ...) may ever return. advi
probably uses the open_proc / open_process in the OCaml stdlib, which
if I remember well has this fd leak bug (or lack of feature or
however you want to call that); I use the following in my own code:
(* Adapted from unix.ml in ocaml stdlib:
*
* Copyright 1996 Institut National de Recherche en Informatique et
* en Automatique.
*)
let try_set_close_on_exec fd =
try Unix.set_close_on_exec fd; true with Invalid_argument _ -> false
let open_proc_sane cmd args (*proc*) input output error toclose =
let cloexec = List.for_all try_set_close_on_exec toclose in
match Unix.fork() with
0 -> Unix.dup2 input Unix.stdin; Unix.close input;
Unix.dup2 output Unix.stdout; Unix.close output;
Unix.dup2 error Unix.stderr; Unix.close error;
if not cloexec then List.iter Unix.close toclose;
begin try Unix.execvp cmd args
with _ -> exit 127
end
| id -> id;;
let open_process_sane cmd args =
let (in_read, in_write) = Unix.pipe() in
let (out_read, out_write) = Unix.pipe() in
let (err_read, err_write) = Unix.pipe() in
let outchan = Unix.out_channel_of_descr in_write in
let inchan = Unix.in_channel_of_descr out_read in
let errchan = Unix.in_channel_of_descr err_read in
let cpid=open_proc_sane cmd args in_read out_write err_write [in_write;
out_read; err_read] in
Unix.close in_read;
Unix.close out_write;
Unix.close err_write;
(cpid, (outchan,in_write), (inchan, out_read), (errchan,err_read));;
)
-- System Information:
Debian Release: 5.0
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.26-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=fr_LU.UTF-8, LC_CTYPE=fr_LU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages advi depends on:
ii ghostscript-x [gs] 8.62.dfsg.1-3.2lenny0 The GPL Ghostscript PostScript/PDF
ii libc6 2.7-18 GNU C Library: Shared libraries
ii libfreetype6 2.3.7-2 FreeType 2 font engine, shared lib
ii libgif4 4.1.6-6 library for GIF images (library)
ii libice6 2:1.0.4-1 X11 Inter-Client Exchange library
ii libjpeg62 6b-14 The Independent JPEG Group's JPEG
ii libpng12-0 1.2.27-2 PNG library - runtime
ii libsm6 2:1.0.3-2 X11 Session Management library
ii libtiff4 3.8.2-11 Tag Image File Format (TIFF) libra
ii libx11-6 2:1.1.5-2 X11 client-side library
ii libxext6 2:1.0.4-1 X11 miscellaneous extension librar
ii libxinerama1 2:1.0.3-2 X11 Xinerama extension library
ii libxpm4 1:3.5.7-1 X11 pixmap library
ii texlive-base 2007.dfsg.1-5 TeX Live: Essential programs and f
ii texlive-base-bin 2007.dfsg.2-4 TeX Live: Essential binaries
ii zlib1g 1:1.2.3.3.dfsg-12 compression library - runtime
advi recommends no packages.
Versions of packages advi suggests:
ii bzip2 1.0.5-1 high-quality block-sorting file co
ii ttf-kochi-gothic 1.0.20030809-8 Kochi Subst Gothic Japanese TrueTy
ii ttf-kochi-mincho 1.0.20030809-8 Kochi Subst Mincho Japanese TrueTy
-- no debconf information
\documentclass{article}
\usepackage{qtree}
\begin{document}
\leaf{a}
\leaf{b}
\branch{2}{c}
\qobitree
\end{document}
foo.dvi
Description: TeX dvi file
