Date: Mon, 12 Apr 1999 09:30:02 -0700 (PDT) From: Martin Cracauer <cracauer@cons.org> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/7059: sh dumps core on this script Message-ID: <199904121630.JAA16202@freefall.freebsd.org>
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The following reply was made to PR bin/7059; it has been noted by GNATS.
From: Martin Cracauer <cracauer@cons.org>
To: freebsd-gnats-submit@freebsd.org, mi@aldan.algebra.com
Cc:
Subject: Re: bin/7059: sh dumps core on this script
Date: Mon, 12 Apr 1999 18:22:40 +0200
I tangled with this problem, but it looks like a serious memory
corruption, the variable stack is being damaged. I just committed a
fix for the stack problem that prints a more meaningful error message,
but that's all for now.
Appended are three variations of one simple script, where the last one
fails for me, while the others do not. This happens on 2.2-stable,
3.1-stable and 4.0-current on machines from 486 to PII-450. As you can
see, the variations are of a kind that surely shouldn't change
anything real.
Maybe someone with Purify or similar can run the last of these scripts
with an instance of /bin/sh compiled on that machine? I'm happy to
send you a binary for Solaris or whatever you run Purify on (bet the
coredump doesn't happen on SPARC, but it's worth a try).
Martin
# This is a shell archive. Save it in a file, remove anything before
# this line, and then unpack it by entering "sh file". Note, it may
# create directories; files and directories will be owned by you and
# have default permissions.
#
# This archive contains:
#
# test3a
# test3b
# test3c
#
echo x - test3a
sed 's/^X//' >test3a << 'END-of-test3a'
X#! /bin/sh
X
X# The coredump happens with the last entry of this string
X# It doesn't happen when you shorten the string even when leaving the
X# offending last entry intact.
Xexport QUERY_STRING='First_Name=Mikhail&Last_Name=Teterin&Phone=617-332-0552&Fax=&Email=mi%40aldan.algebra.com&Company=%26ls&Division=&Title=&Company_Size=less+than+25&Address=&City=&State=&Postal_Code=&Country=&Reference=Softimage+Website&Intended_Use=&Number_Users=single&Programming=Yes&B2=Submit&QQQLINKQQQ=./dura'
X
X# somewhere before memalloc.c, line 190, variable stackp is set to NULL
X# definitivly a timing problem.
X
Xfor pair in `echo ${QUERY_STRING} | sed 's/&/ /g'` ; do
X _TY_FILE=${pair#QQQLINKQQQ=}
X if [ $_TY_FILE != $pair ]
X then
X# If you activate the following echo's, it will work in my machine
X# Looks like a timing problem...
X# echo check 1 1>&1
X _TY_FILE2=${DOCUMENT_ROOT}${_TY_FILE}
X# echo check 2 1>&1
X
X# The following works when used without the next
X test -f '/e' || echo bla 1>&2
X# This one doesn't
X# test -f '/e' \
X# || echo bla 1>&2
X break
X fi
Xdone
END-of-test3a
echo x - test3b
sed 's/^X//' >test3b << 'END-of-test3b'
X#! /bin/sh
X
X# The coredump happens with the last entry of this string
X# It doesn't happen when you shorten the string even when leaving the
X# offending last entry intact.
Xexport QUERY_STRING='First_Name=Mikhail&Last_Name=Teterin&Phone=617-332-0552&Fax=&Email=mi%40aldan.algebra.com&Company=%26ls&Division=&Title=&Company_Size=less+than+25&Address=&City=&State=&Postal_Code=&Country=&Reference=Softimage+Website&Intended_Use=&Number_Users=single&Programming=Yes&B2=Submit&QQQLINKQQQ=./dura'
X
X# somewhere before memalloc.c, line 190, variable stackp is set to NULL
X# definitivly a timing problem.
X
Xfor pair in `echo ${QUERY_STRING} | sed 's/&/ /g'` ; do
X _TY_FILE=${pair#QQQLINKQQQ=}
X if [ $_TY_FILE != $pair ]
X then
X# If you activate the following echo's, it will work in my machine
X# Looks like a timing problem...
X echo check 1 1>&1
X _TY_FILE2=${DOCUMENT_ROOT}${_TY_FILE}
X echo check 2 1>&1
X
X# The following works when used without the next
X test -f '/e' || echo bla 1>&2
X# This one doesn't
X test -f '/e' \
X || echo bla 1>&2
X break
X fi
Xdone
END-of-test3b
echo x - test3c
sed 's/^X//' >test3c << 'END-of-test3c'
X#! /bin/sh
X
X# The coredump happens with the last entry of this string
X# It doesn't happen when you shorten the string even when leaving the
X# offending last entry intact.
Xexport QUERY_STRING='First_Name=Mikhail&Last_Name=Teterin&Phone=617-332-0552&Fax=&Email=mi%40aldan.algebra.com&Company=%26ls&Division=&Title=&Company_Size=less+than+25&Address=&City=&State=&Postal_Code=&Country=&Reference=Softimage+Website&Intended_Use=&Number_Users=single&Programming=Yes&B2=Submit&QQQLINKQQQ=./dura'
X
X# somewhere before memalloc.c, line 190, variable stackp is set to NULL
X# definitivly a timing problem.
X
Xfor pair in `echo ${QUERY_STRING} | sed 's/&/ /g'` ; do
X _TY_FILE=${pair#QQQLINKQQQ=}
X if [ $_TY_FILE != $pair ]
X then
X# If you activate the following echo's, it will work in my machine
X# Looks like a timing problem...
X# echo check 1 1>&1
X _TY_FILE2=${DOCUMENT_ROOT}${_TY_FILE}
X# echo check 2 1>&1
X
X# The following works when used without the next
X test -f '/e' || echo bla 1>&2
X# This one doesn't
X test -f '/e' \
X || echo bla 1>&2
X break
X fi
Xdone
END-of-test3c
exit
--
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Martin Cracauer <cracauer@cons.org> http://www.cons.org/cracauer/
BSD User Group Hamburg, Germany http://www.bsdhh.org/
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