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[184.96.189.144]) by smtp.gmail.com with ESMTPSA id af79cd13be357-9391703a49asm865069785a.11.2026.08.31.13.05.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Aug 2026 13:05:22 -0700 (PDT) Message-ID: Subject: Re: [PATCH] Differentiate scenarios when watchdog is closed From: "chaithco@redhat.com" To: Guenter Roeck Cc: wim@linux-watchdog.org, linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 31 Aug 2026 14:05:20 -0600 In-Reply-To: <93d22742-bf3e-4e69-aed5-27137d8f49bf@roeck-us.net> References: <20260824205051.4117285-2-chaithco@redhat.com> <2bd566ca-2696-46d3-aeec-57db66fa1902@roeck-us.net> <93d22742-bf3e-4e69-aed5-27137d8f49bf@roeck-us.net> Autocrypt: addr=chaithco@redhat.com; prefer-encrypt=mutual; keydata=mDMEapCVehYJKwYBBAHaRw8BAQdAORXHCioh8sg4JScf3G8JrmX1nUt+teTWsqlbk67dr va0NkNoYXJsZXMgSGFpdGhjb2NrIChXb3JrIEdQRyBLZXkpIDxjaGFpdGhjb0ByZWRoYXQuY29tPo iTBBMWCgA7FiEEoln/+dhdP2hiiZGQ86/NNaAhFjYFAmqQlXoCGwMFCwkIBwICIgIGFQoJCAsCBBY CAwECHgcCF4AACgkQ86/NNaAhFjbm1gEA9t0Iaxr6IkGONOjD7eB10PjTYyDGVd4QdJYPohP8xRsA /0OETJIGSr5rxRqG23AGUdlnUfzFlgm3QuyfNpGHcv0C Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-0ywmMAk0QA94DymszmK7" User-Agent: Evolution 3.60.2 (3.60.2-1.fc44) Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 --=-0ywmMAk0QA94DymszmK7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-08-27 at 11:10 -0700, Guenter Roeck wrote: > Problem is that we don't know if "something bad happened". The same > message > will be seen if the watchdog daemon was killed or crashed. We can not > just > assume that closing the watchdog device was intentional. That's the same sticking point I've come across. Differentiating between positive intentional closure versus malicious or buggy closure would somehow need to be communicated to the kernel. It makes more sense that users of the watchdog which intend to close the watchdog while still running maybe denote such. I opened a PR with systemd at https://github.com/systemd/systemd/pull/43552 to see if there was some way this could be tackled from that perspective. --=-0ywmMAk0QA94DymszmK7 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQSiWf/52F0/aGKJkZDzr801oCEWNgUCapXegAAKCRDzr801oCEW NtczAQDuBs40A1K1EQdOhomprxd8gwJPgKlHd6zb+N5UZpMywwEAmTSigALQTDZQ Xi/e4vWX8AfozunR2RkF1Sz08H1EYwY= =AKZI -----END PGP SIGNATURE----- --=-0ywmMAk0QA94DymszmK7--