Date: Sun, 12 Dec 2004 11:50:38 +0100 (CET) From: Ulrich Spoerlein <q@uni.de> To: FreeBSD-gnats-submit@FreeBSD.org Cc: simokawa@FreeBSD.org Subject: kern/74977: dcons.ko requires KDB support Message-ID: <200412121050.iBCAoc6w052924@coyote.q.local> Resent-Message-ID: <200412121100.iBCB0pS5069692@freefall.freebsd.org>
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>Number: 74977
>Category: kern
>Synopsis: dcons.ko requires KDB support
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Sun Dec 12 11:00:51 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: Ulrich Spoerlein
>Release: FreeBSD 5.3-RELEASE-p2 i386
>Organization:
>Environment:
System: FreeBSD coyote 5.3-RELEASE-p2
>Description:
kldload dcons will fail for the GENERIC Kernel, because the gdb_cur
symbol is missing. The module Makefile unconditionally defines KDB and
ALT_BREAK_TO_DEBUGGER
/sys/modules/dcons/Makefile:
opt_ddb.h:
echo "#define KDB 1" > $@
opt_comconsole.h:
echo "#define ALT_BREAK_TO_DEBUGGER 1" > $@
Therefore, on kldload you get: kernel: link_elf: symbol gdb_cur undefined
This leads to dconschat(8) becomes useless without recompiling the
kernel.
>How-To-Repeat:
Boot GENERIC, kldload dcons
>Fix:
Remove those two 'echo defines' from the Makefile, rebuild the module,
dconschat(8) starts working! :)
I don't know if this is the right fix however. Is KDB needed on the
_client_ to debug the _servers_ Kernel via dconschat?
>Release-Note:
>Audit-Trail:
>Unformatted:
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