Date: Mon, 25 Aug 2003 13:49:30 -0700 (PDT) From: Nate Lawson <nate@root.org> To: ken@kdm.org Cc: current@freebsd.org Subject: scsi-da does not work with INVARIANTS (fwd) Message-ID: <20030825134756.P18344@root.org>
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Ken is aware of the following problem. It is in both cd(4) and da(4) as
well as stable and current. One possible approach would be to run
{da,cd}register() from a task queue and not at interrupt time.
-Nate
---------- Forwarded message ----------
Date: Mon, 25 Aug 2003 15:45:22 -0500
From: Aniruddha Bohra <bohra@cs.rutgers.edu>
To: njl@freebsd.org
Subject: scsi-da does not work with INVARIANTS
[ Also posted to -stable ]
Hello
I tried compiling the 4-STABLE branch with INVARIANTS and
INVARIANT_SUPPORT.
I got a panic on boot - The problem is that daregister
calls malloc with M_WAITOK in interrupt context and INVARIANTS
panics the kernel.
$FreeBSD: src/sys/cam/scsi/scsi_da.c,v 1.42.2.40 2003/08/24 03:26:38
ken Exp $
The problem is in the following lines :
softc->sysctl_tree = SYSCTL_ADD_NODE(&softc->sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_kern_cam_da), OID_AUTO, tmpstr2,
CTLFLAG_RD, 0, tmpstr);
SYSCTL_ADD_NODE is a macro defined in sys/sysctl.h as :
#define SYSCTL_ADD_NODE(ctx, parent,nbr,name,access,handler, descr)\
sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_NODE|access,\
0, 0, handler, "N", descr);
And sysctl_add_oid is defined in kern/kern_sysctl.c and has the following :
oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK);
which has a WAITOK malloc.
Unfortunately, I cannot get a trace till tomorrow. Right now
the machine runs fine without INVARIANTS and INVARIANT_SUPPORT.
Thanks
Aniruddha
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