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Re: kern/55774: Kernel panics if another PC is powered on with serial cable attached between two
Yes, it is ddb on break. I didn't know about this functionality and
somehow it took me a while to realize the pattern. Thank you for the
help and information. The bug can be closed.
On Mon, Nov 2, 2020 at 7:35 AM Martin Husemann <martin%duskware.de@localhost> wrote:
> The following reply was made to PR kern/55774; it has been noted by GNATS.
> From: Martin Husemann <martin%duskware.de@localhost>
> To: gnats-bugs%netbsd.org@localhost
> Subject: Re: kern/55774: Kernel panics if another PC is powered on with
> serial cable attached between two
> Date: Mon, 2 Nov 2020 06:32:13 +0100
> On Mon, Nov 02, 2020 at 12:55:23AM +0100, Joerg Sonnenberger wrote:
> > That's not a panic, but ddb-on-break?
> Exactly. Easy workaround: set the ddb trigger sequence to something
> else (popular option: +++++), see cnmagic(9) for a description of
> the format and then set it via /etc/sysctl.conf like:
> Background: many PCs force the TX signal of all on-board com interfaces
> to 0V for an extended period during power on. This signals a "break"
> condition to the peer, and the console code reacts to it by invoking
> the kernel debugger.
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