Date: Tue, 28 Jan 2003 19:04:07 -0600 From: Sean Kelly <smkelly@zombie.org> To: current@freebsd.org Subject: Lock order reversal Message-ID: <20030129010407.GA31592@edgemaster.zombie.org>
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I just noticed this during bootup. It is repeatable.
FreeBSD 5.0-CURRENT #1: Mon Jan 27 14:00:00 CST 2003
root@edgemaster.zombie.org:/usr/obj/usr/src/sys/EDGEMASTER
=2E..
Mounting root from ufs:/dev/ad1s1a
cd0 at ata0 bus 0 target 1 lun 0
cd0: <PLEXTOR CD-R PX-W4012A 1.01> Removable CD-ROM SCSI-0 device
cd0: 33.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present - t=
ray open
lock order reversal
1st 0xc6998a54 process lock (process lock) @ /usr/src/sys/kern/kern_descri=
p.c:2104
2nd 0xc6944234 filedesc structure (filedesc structure) @ /usr/src/sys/kern=
/kern_descrip.c:2111
sysctl_kern_file(SYSCTL_HANDLER_ARGS)
{
=2E..
LIST_FOREACH(p, &allproc, p_list) {
2104---> PROC_LOCK(p);
xf.xf_pid =3D p->p_pid;
xf.xf_uid =3D p->p_ucred->cr_uid;
if ((fdp =3D p->p_fd) =3D=3D NULL) {
PROC_UNLOCK(p);
continue;
}
2111---> FILEDESC_LOCK(fdp);
for (n =3D 0; n < fdp->fd_nfiles; ++n) {
if ((fp =3D fdp->fd_ofiles[n]) =3D=3D NULL)
continue;
=2E...
--=20
Sean Kelly | PGP KeyID: D2E5E296
smkelly@zombie.org | http://www.zombie.org
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