Date: Tue, 11 Dec 2001 07:00:04 -0800 (PST) From: Stefan.Esser@o-tel-o.de To: freebsd-bugs@FreeBSD.org Subject: Re: kern/32681: Reproducable PANIC in -stable Message-ID: <200112111500.fBBF04J48329@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
The following reply was made to PR kern/32681; it has been noted by GNATS.
From: Stefan.Esser@o-tel-o.de
To: freebsd-gnats-submit@FreeBSD.org
Cc: Stefan.Esser@Arcor.Net, se@freebsd.org
Subject: Re: kern/32681: Reproducable PANIC in -stable
Date: Tue, 11 Dec 2001 16:00:45 +0100
Further debugging reveals, that the panic is caused by PROCFS (on my -c=
urrent
box running either an non-SMP or SMP kernel).
In order to check for the presence of some process %PID%, nessusd perfo=
rms an
opendir("/proc/%PID%"), which can lead to a panic in fstafs(), if the
corresponding process just finishes just before the call to fstatfs ...=
/*
* First method : attempt to open /proc/<pid>
* (we first check that we can open /proc/ourpid because
* we may run on some weird system)
*/
sprintf(procname, "/proc/%d", getpid());
dir =3D opendir(procname);
if(dir) /* The /proc trick worked for us */
{
closedir(dir);
sprintf(procname, "/proc/%d", pid);
dir =3D opendir(procname);
if(dir){
closedir(dir);
return 1;
}
else return 0;
}
Truss output caused by opendir("/proc/%PID%"). Seems that either the ar=
gument
printing does not work for the specific system calls (or there is some =
other
problem), but the opendir call had been issued with a valid directory n=
ame (see
debugging output below):
stat("D=F2=BF=BFqyp(=A8=ACr(=FFt",0xbfbff004) =3D 0 (0x0=
)
open("qyp(=A8=ACr(=FFt",4,027757771104) =3D 13 (0xd)
fstat(13,0xbfbff004) =3D 0 (0x0)
fcntl(0xd,0x2,0x1) =3D 0 (0x0)
fstatfs(0xd,0xbfbfef04) =3D 0 (0x0)
Debugging output:
905 sprintf(procname, "/proc/%d", getpid());
(gdb)
getpid() =3D 724 (0x2d4)
906 dir =3D opendir(procname);
(gdb)
907 if(dir) /* The /proc trick worked for us */
(gdb) p procname
$7 =3D "/proc/724\000"
(gdb) s
909 closedir(dir);
(gdb)
close(13) =3D 0 (0x0)
910 sprintf(procname, "/proc/%d", pid);
=
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200112111500.fBBF04J48329>