linux-kernel - KGDB/KDB treats WARN*() as Oops on x86 since 4.12

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Message-ID: <CAOi1vP-YRgSNZ82XrMK0H3M28ux+St91AdM3bWsW0fCzmK=FjQ@mail.gmail.com>
Date:   Mon, 9 Oct 2017 14:24:33 +0200
From:   Ilya Dryomov <idryomov@...il.com>
To:     Jason Wessel <jason.wessel@...driver.com>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        kgdb-bugreport@...ts.sourceforge.net,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: KGDB/KDB treats WARN*() as Oops on x86 since 4.12

Hi Jason,

Starting with 4.12, WARN*() is implemented with ud0, generating an
Invalid Opcode exception.  KGDB/KDB gets entered as if it were an Oops,
making KGDB/KDB rather hard to use, particularly on testing kernels.

Alexander posted a fix a while back, but Peter seems to be waiting for
your ack.  Could you please weigh in?

  [PATCH] x86/debug: Handle warnings before the notifier chain
  https://patchwork.kernel.org/patch/9859065/

Thanks,

                Ilya