GNU bug report logs - #19779
dmd: service definition errors cause kernel panic

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Mark H Weaver <mhw <at> netris.org>
To: bug-guix <at> gnu.org
Subject: dmd: service definition errors cause kernel panic
Date: Thu, 05 Feb 2015 02:18:22 -0500

When I first wrote 'wicd-service', I mispelled
'make-forkexec-constructor'.  This caused a kernel panic whenever the
service was included in my OS config.  I don't know whether dmd printed
a helpful error message, but if so, it was followed immediately by a
kernel call trace that caused earlier messages to scroll off the screen.
The result is that it was quite difficult to find the source of the
error.

In case of such errors, it would be good if dmd would print an error
message with the most useful information at the bottom (in case it does
not all fit on the display) and then to avoid exiting so that the
message could be read and understood.

      Mark

Message #10 received at 19779-done <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Mark H Weaver <mhw <at> netris.org>
Cc: 19779-done <at> debbugs.gnu.org
Subject: Re: bug#19779: dmd: service definition errors cause kernel panic
Date: Wed, 25 Nov 2015 12:02:09 +0100

Mark H Weaver <mhw <at> netris.org> skribis:

> When I first wrote 'wicd-service', I mispelled
> 'make-forkexec-constructor'.  This caused a kernel panic whenever the
> service was included in my OS config.  I don't know whether dmd printed
> a helpful error message, but if so, it was followed immediately by a
> kernel call trace that caused earlier messages to scroll off the screen.
> The result is that it was quite difficult to find the source of the
> error.
>
> In case of such errors, it would be good if dmd would print an error
> message with the most useful information at the bottom (in case it does
> not all fit on the display) and then to avoid exiting so that the
> message could be read and understood.

Commit b9c7ed7 wraps service loading in ‘call-with-error-handling’,
which spawns a REPL when something goes wrong.  Better than a kernel
panic!

Ludo’.

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