Date: Tue, 2 Nov 2004 01:39:12 -0500 (EST) From: parv@pair.com To: FreeBSD-gnats-submit@FreeBSD.org Cc: joe@zircon.seattle.wa.us Subject: ports/73404: shells/ksh93 - notify option + output redirected to nonexistent file cause crash w/ segfault Message-ID: <20041102063912.251EC53C1@default.chvlva.adelphia.net> Resent-Message-ID: <200411020640.iA26eRPF052112@freefall.freebsd.org>
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>Number: 73404
>Category: ports
>Synopsis: shells/ksh93 - notify option + output redirected to nonexistent file cause crash w/ segfault
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-ports-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Nov 02 06:40:26 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: parv
>Release: FreeBSD 4.10-RELEASE-p3 i386
>Organization:
>Environment:
System: FreeBSD moo.holy.cow 4.10-RELEASE-p3
Some of the compiler flags:
CPUTYPE=i686
COPTFLAGS= -O -pipe
CFLAGS= -O -pipe -g
Ksh93 version:
shells/ksh93/Makefile: 1.37 2004/03/18 02:07:14
${.sh.version}: Version M 1993-12-28 p
>Description:
(It does not make any difference if ksh93 was built as static or
dynamic linked as both versions crash. Core below is for the static
version. I have sent a similar message to David Korn, dgk at
research.att.com)
I started ksh93 in bash 3.0_4 and ksh93 keep crashing; ksh also
crashed in /bin/sh (so the parent shell should not be of much
importance).
I narrowed it down to the following necessary conditions ...
- 2d time ksh is started in bash; on the very first run
everything seems to be normal. (After starting ksh93, ~/.profile
is sourced.)
- $ENV refers to a file which contains "set -o notify"; setting
ENV to the contents of the file does not cause crash.
- Output is redirected to a nonexistent file AND in the background
- ksh93 is replaced via "exec $0"
Below are the 2 files to create the crash environment...
~/.profile ...
ENV="${HOME}/.kshrc-segfault"
export ENV
> initially-nonexistent-file &
exec $0
~/.kshrc-segfault ...
set -o notify
...and (gdb) backtrace...
warning: core file may not match specified executable file.
Core was generated by `ksh93'.
Program terminated with signal 11, Segmentation fault.
#0 job_unlink (pw=0x0) at /work/ports/misc/ports/shells/ksh93/work/src/cmd/ksh93/sh/jobs.c:1438
1438 job.pwlist = pw->p_nxtjob;
(gdb) bt
#0 job_unlink (pw=0x0) at /work/ports/misc/ports/shells/ksh93/work/src/cmd/ksh93/sh/jobs.c:1438
#1 0x8053e49 in job_unpost (pwtop=0xbfbfecf0, notify=1)
at /work/ports/misc/ports/shells/ksh93/work/src/cmd/ksh93/sh/jobs.c:1397
#2 0x8052643 in job_waitsafe (sig=20) at /work/ports/misc/ports/shells/ksh93/work/src/cmd/ksh93/sh/jobs.c:328
#3 0xbfbfffac in ?? ()
#4 0x804a1fe in ed_read (context=0x8162048, fd=0, buff=0x816fe60 "", size=4096, reedit=0)
at /work/ports/misc/ports/shells/ksh93/work/src/cmd/ksh93/edit/edit.c:755
#5 0x805159c in slowread (iop=0x814d1e0, buff=0x816fe60, size=4096, handle=0x8163960)
at /work/ports/misc/ports/shells/ksh93/work/src/cmd/ksh93/sh/io.c:1113
#6 0x80c1443 in sfrd ()
#7 0x80bdb94 in _sffilbuf (f=0x814d1e0, n=-1)
at /work/ports/misc/ports/shells/ksh93/work/src/lib/libast/sfio/sffilbuf.c:108
#8 0x80c1c3f in sfreserve (f=0x814d1e0, size=0, type=0)
at /work/ports/misc/ports/shells/ksh93/work/src/lib/libast/sfio/sfreserve.c:117
#9 0x80491d3 in exfile ()
#10 0x8048c26 in sh_main ()
#11 0x804820c in main (argc=1, argv=0xbfbff3f0)
at /work/ports/misc/ports/shells/ksh93/work/src/cmd/ksh93/sh/pmain.c:33
>How-To-Repeat:
See above.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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