Date: Tue, 3 Oct 2000 10:29:27 -0500 (CDT) From: Jonathan Lemon <jlemon@flugsvamp.com> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/21773: panic w/nexus + ata (ivar problem) Message-ID: <200010031529.e93FTRY18629@prism.flugsvamp.com>
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>Number: 21773
>Category: kern
>Synopsis: panic w/nexus + ata (ivar problem)
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Oct 05 09:40:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator: Jonathan Lemon
>Release: FreeBSD 5.0-CURRENT i386
>Organization:
>Environment:
-current as of Tue, Oct 2, 2000
>Description:
After the nexus/ivar change around Sep 28, my kernel no longer
boots. This seems to be a disagreement over how ivars are used
in the kernel. Within nexus_alloc_resource(), we have the
following:
#define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
struct nexus_device *ndev = DEVTONX(child);
where ``child'' happens to be ata1. However, within ata/ata-all.c,
There is the following statement:
device_set_ivars(child, (void *)(uintptr_t) unit);
So when nexus_alloc_resource() is called, it ends up treating the
unit as a pointer. I'm not sure what the new world order mandates
here; what is the legal usage of ivar?
Additional debug infromation from the nexus_alloc_resource()
stack frame:
(kgdb) p *dev
$4 = {ops = 0xc0a57000, link = {tqe_next = 0x0, tqe_prev = 0xc0721410},
parent = 0xc0721400, children = {tqh_first = 0xc0a6f300,
tqh_last = 0xc0a6f184}, driver = 0xc02fb38c, devclass = 0xc0725300,
unit = 0, nameunit = 0xc071d640 "nexus0", desc = 0x0, busy = 0,
state = DS_ALIVE, devflags = 0, flags = 19, order = 0 '\000',
pad = 0 '\000', ivars = 0x0, softc = 0xc071d620}
(kgdb) p *child
$5 = {ops = 0xc0a43000, link = {tqe_next = 0x0, tqe_prev = 0xc0a70804},
parent = 0xc0a70f00, children = {tqh_first = 0x0, tqh_last = 0xc0a70790},
driver = 0xc02f5ce4, devclass = 0xc0718ce0, unit = 1,
nameunit = 0xc071d390 "ata1", desc = 0x0, busy = 0, state = DS_NOTPRESENT,
devflags = 0, flags = 3, order = 0 '\000', pad = 0 '\000', ivars = 0x1,
softc = 0xc0a70680}
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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