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Date: Sun, 7 Sep 1997 18:04:17 +0200 (MET DST)
From: J Wunsch <j@uriah.heep.sax.de>
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Subject: kern/4486: ahc(4) in RELENG_2_2 can't do kernel core dumps
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>Number:         4486
>Category:       kern
>Synopsis:       ahc(4) in RELENG_2_2 can't do kernel core dumps
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Sep  7 09:30:02 PDT 1997
>Last-Modified:
>Originator:     J Wunsch
>Organization:
interface business GmbH
>Release:        FreeBSD 2.2-STABLE i386
>Environment:

Any RELENG_2_2 kernel with an ahc(4) driver, and kernel core dumping
enabled.  Observed for at least half a year now.

>Description:

When the kernel tries to dump core on the mentioned system, it starts
to say `dumping ...', but then jams.  The machine needs a hard reset
in order to be freed.

>How-To-Repeat:

Configure a RELENG_2_2 kernel with an ahc(4) driver for kernel core
dumping, and cause a panic.  Calling `panic' from DDB should suffice.

>Fix:
	
Unknown.  Suspecting some problem with interrupts enabled, but the
driver trying to poll the controller.
>Audit-Trail:
>Unformatted: