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Fri, 27 May 2022 13:49:14 +0200 Message-ID: <9483424cc3c89e5fa83ccc1e22b1f6cc7d04dd95.camel@telenet.be> From: Maxime Devos Date: Fri, 27 May 2022 13:49:08 +0200 In-Reply-To: References: <20220527082519.501697-1-zimon.toutoune@gmail.com> <9432b1161007faacc0bd0e58da0bf839e2e8ec39.camel@telenet.be> <24883447c6f3d9b27bcc6e11e117ee974916e091.camel@telenet.be> Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-+33rIk7edC1uwJlpKUCa" User-Agent: Evolution 3.38.3-1 MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=telenet.be; s=r22; t=1653652154; bh=4P5dbjnaGULbIKPZG7djTVanZAmXv+6S80sSL+F+rk8=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=iGP17hiO64SueU/1xVZvfxt9OFxZAyszr+R1K0gtH0Yh0WLAT85gX2pGm19LGYIsp GfHU7DERUpB5xDlt576Wm9PCeW7oa2o88FzhqyJnTByoC1l9o4wl4PtkxRiOA4xhoG ZzTzHO8hGt88ePXGDSJMIk6EoAVWtp6z7TZu2YWzxvPCVP6kusr2GtCYWLluASJl/v jzndqvjnSiJsREeI08/w6M/tiJvJn3bM79DGrIqjmEpSiqZhWkGg3BZXf1KpcCnoO1 x2ECOC7jTQLKBg3R6MiFLvLBahXI5F9lhA83yW69wPJFQRFRNTs7ogOn7/KwJSXlz/ nZwFXSxENI8og== X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: guix-patches@gnu.org List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-patches-bounces+larch=yhetil.org@gnu.org Sender: "Guix-patches" X-Migadu-Flow: FLOW_IN X-Migadu-To: larch@yhetil.org X-Migadu-Country: US ARC-Message-Signature: i=1; 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aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=telenet.be header.s=r22 header.b=iGP17hiO; dmarc=fail reason="SPF not aligned (relaxed)" header.from=telenet.be (policy=none); spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: 2.95 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=telenet.be header.s=r22 header.b=iGP17hiO; dmarc=fail reason="SPF not aligned (relaxed)" header.from=telenet.be (policy=none); spf=pass (aspmx1.migadu.com: domain of "guix-patches-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="guix-patches-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 6F6F22896A X-Spam-Score: 2.95 X-Migadu-Scanner: scn0.migadu.com X-TUID: 68//mkOyJIcF --=-+33rIk7edC1uwJlpKUCa Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable zimoun schreef op vr 27-05-2022 om 13:39 [+0200]: > The only case is when 'read' fails.=C2=A0 Personally, I do not see how it > would be possible.=C2=A0 If you have a concrete example, then we can > examine. I don't have a 100%-concrete example, but wasn't there some file system crash mode, where the contents of a new file has not yet been written to disk yet the length of the file is > 0, so effectively the file points to an arbitrary range on the disk? E.g., say Guix told the FS write 1234 to last-expiry-cleanup. Then the FS created last-expiry- cleanup, choose a range of 4 bytes to save it as, then crashes before writing the contents. After restarting, the file contains the _old_ 4 bytes. These old 4 bytes could be the ASCII representation of "foo . Then, when 'read' is run (after rebooting), it sees an incomplete string "foo, so it fails. Greetings, Maxime. --=-+33rIk7edC1uwJlpKUCa Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iI0EABYKADUWIQTB8z7iDFKP233XAR9J4+4iGRcl7gUCYpC6tBccbWF4aW1lZGV2 b3NAdGVsZW5ldC5iZQAKCRBJ4+4iGRcl7qo5AP9PG6k+5mhppXv1EmyFZqN5Ei4c vRUZTQ4+luOGOMR4iwEAqw2kaJX02uPQfwDbDDOkWClCugIn9QGRISSnSEvFKAw= =ejKM -----END PGP SIGNATURE----- --=-+33rIk7edC1uwJlpKUCa--