| Subject: | segfault following pager in perl debugger |
all combinations of i686/x86_64 linux boxes, readline 5.2/6,2, and
xterm/xfce term give me segfaults following use of the pager in perl
debugger as demonstrated below. i've switched to Term::ReadLine::Perl
which works sufficiently for my purposes, but hopefully the info below
is of use to someone?
#######
[root@box ~]# PERL_RL=Gnu perl -d -e 0
Loading DB routines from perl5db.pl version 1.37
Editor support available.
Enter h or 'h h' for help, or 'man perldebug' for more help.
main::(-e:1): 0
DB<1> o pager?
pager = '|/usr/bin/less -isr'
DB<2> |h <--[then pressing 'q' to quit 'less']
Signal SEGV at /usr/local/lib/perl5/Term/ReadLine/Gnu.pm line 331.
Term::ReadLine::Gnu::readline('Term::ReadLine=HASH(0x988e628)',
' DB<3> ') called at /usr/share/perl5/perl5db.pl line 6422
DB::readline(' DB<2> ') called at /usr/share/perl5/perl5db.pl
line 1997
DB::DB called at -e line 1
Aborted
#######
[root@box ~]# gdb perl --pid=$(pidof perl)
GNU gdb (GDB) 7.5
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/
gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show
copying"
and "show warranty" for details.
This GDB was configured as "i486-slackware-linux".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/perl...(no debugging symbols
found)...done.
Attaching to program: /usr/bin/perl, process 2336
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need "set solib-search-path" or "set sysroot"?
Reading symbols from /usr/lib/perl5/CORE/libperl.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/perl5/CORE/libperl.so
Reading symbols from /lib/libnsl.so.1...(no debugging symbols
found)...done.
Loaded symbols for /lib/libnsl.so.1
Reading symbols from /lib/libdl.so.2...(no debugging symbols
found)...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libm.so.6...(no debugging symbols
found)...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libcrypt.so.1...(no debugging symbols
found)...done.
Loaded symbols for /lib/libcrypt.so.1
Reading symbols from /lib/libutil.so.1...(no debugging symbols
found)...done.
Loaded symbols for /lib/libutil.so.1
Reading symbols from /lib/libpthread.so.0...(no debugging symbols
found)...done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /lib/libc.so.6...(no debugging symbols
found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols
found)...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /usr/lib/perl5/auto/IO/IO.so...(no debugging
symbols found)...done.
Loaded symbols for /usr/lib/perl5/auto/IO/IO.so
Reading symbols from /usr/local/lib/perl5/auto/Term/ReadLine/Gnu/
Gnu.so...done.
Loaded symbols for /usr/local/lib/perl5/auto/Term/ReadLine/Gnu/Gnu.so
Reading symbols from /usr/lib/libreadline.so.6...done.
Loaded symbols for /usr/lib/libreadline.so.6
Reading symbols from /lib/libtermcap.so.2...(no debugging symbols
found)...done.
Loaded symbols for /lib/libtermcap.so.2
0xb755a30e in __read_nocancel () from /lib/libpthread.so.0
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0xb742e86f in fflush () from /lib/libc.so.6
(gdb) bt full
#0 0xb742e86f in fflush () from /lib/libc.so.6
No symbol table info available.
#1 0xb7335a8b in rl_prep_terminal (meta_flag=1) at ../rltty.c:662
tty = 4
tio = {
c_iflag = 1030,
c_oflag = 5,
c_cflag = 191,
c_lflag = 35377,
c_line = 0 '\000',
c_cc =
"\003\034\177\025\004\000\001\000\021\023\032\000\022\017\027", '\000'
<repeats 16 times>,
c_ispeed = 15,
c_ospeed = 15
}
#2 0xb732e9a5 in readline (prompt=0x96b6020 "\001\033[4m\002 DB<2>
\001\033[m\002") at ../readline.c:336
value = 0xb779fd50 "\320)\030"
#3 0xb7368405 in XS_Term__ReadLine__Gnu__XS_rl_readline
(my_perl=0x95ba008, cv=0x98a5ff0) at Gnu.xs:1357
prompt = 0x96b6020 "\001\033[4m\002 DB<2> \001\033[m\002"
RETVAL = 0x95ba170 "ps\214\t"
sp = 0x98d0fac
ax = 3
mark = 0x98d0fa8
items = 1
#4 0xb76d3ad4 in Perl_pp_entersub () from /usr/lib/perl5/CORE/
libperl.so
No symbol table info available.
#5 0xb76cba08 in Perl_runops_standard () from /usr/lib/perl5/CORE/
libperl.so
No symbol table info available.
#6 0xb765ee1f in perl_run () from /usr/lib/perl5/CORE/libperl.so
No symbol table info available.
#7 0x08048bc3 in main ()
No symbol table info available.
(gdb) c
Continuing.
Program received signal SIGABRT, Aborted.
0xb73f7e01 in kill () from /lib/libc.so.6
(gdb) c
Continuing.
Program terminated with signal SIGABRT, Aborted.
The program no longer exists.
(gdb)
###########
[root@box ~]# perl -V
Summary of my perl5 (revision 5 version 16 subversion 1) configuration:
Platform:
osname=linux, osvers=3.2.27-smp, archname=i486-linux-thread-multi
uname='linux hive 3.2.27-smp #1 smp mon aug 13 16:23:23 cdt 2012
i686 amd phenom(tm) ii x6 1100t processor authenticamd gnulinux '
config_args='-de -Dprefix=/usr -Dsiteprefix=/usr/local -Dsitelib=/
usr/local/share/perl5 -Dsitearch=/usr/local/lib/perl5 -Darchlib=/usr/
lib/perl5 -Dvendorprefix=/usr -Dprivlib=/usr/share/perl5 -Dvendorlib=/
usr/share/perl5/vendor_perl -Dvendorarch=/usr/lib/perl5/vendor_perl -
Dscriptdir=/usr/bin -Dcccdlflags=-fPIC -Dinstallprefix=/usr -Dlibpth=/
usr/local/lib /usr/lib /lib -Doptimize=-O2 -march=i486 -mtune=i686 -
Dusethreads -Duseithreads -Duseshrplib -Ubincompat5005 -Uversiononly -
Dpager=/usr/bin/less -isr -Darchname=i486-linux'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=undef, use64bitall=undef, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -
pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -
D_FILE_OFFSET_BITS=64',
optimize='-O2 -march=i486 -mtune=i686',
cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -
fstack-protector -I/usr/local/include'
ccversion='', gccversion='4.7.1', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib /lib
libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
libc=/lib/libc-2.15.so, so=so, useshrplib=true, libperl=libperl.so
gnulibc_version='2.15'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -
Wl,-rpath,/usr/lib/perl5/CORE'
cccdlflags='-fPIC', lddlflags='-shared -O2 -march=i486 -mtune=i686 -
L/usr/local/lib -fstack-protector'
Characteristics of this binary (from libperl):
Compile-time options: HAS_TIMES MULTIPLICITY PERLIO_LAYERS
PERL_DONT_CREATE_GVSV PERL_IMPLICIT_CONTEXT
PERL_MALLOC_WRAP PERL_PRESERVE_IVUV USE_ITHREADS
USE_LARGE_FILES USE_LOCALE USE_LOCALE_COLLATE
USE_LOCALE_CTYPE USE_LOCALE_NUMERIC USE_PERLIO
USE_PERL_ATOF USE_REENTRANT_API
Built under linux
Compiled at Aug 20 2012 13:28:33
@INC:
/usr/local/lib/perl5
/usr/local/share/perl5
/usr/lib/perl5/vendor_perl
/usr/share/perl5/vendor_perl
/usr/lib/perl5
/usr/share/perl5
.
#######