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Sat, 06 Jul 2019 08:09:46 -0700 (PDT) Subject: Re: "kernel BUG" and segmentation fault with "device delete" To: Qu Wenruo , linux-btrfs@vger.kernel.org References: <966f5562-1993-2a4f-0d6d-5cea69d6e1c6@gmail.com> <8e009a0c-2c82-90c5-807a-bf3477e0b07a@gmx.com> <8c221f86-b550-fcd6-aef1-13570270a559@gmail.com> <4a7c1c7b-bc1e-4aba-7a9d-581c0272aa86@gmx.com> From: Vladimir Panteleev Openpgp: preference=signencrypt Autocrypt: addr=thecybershadow@gmail.com; prefer-encrypt=mutual; keydata= mQENBFar2yQBCADWo1C5Ir1smytf7+vWGCEoZgb/4XKkxrp+GUO7eJO8iYCWHTmCPZpi6p/z y6eh+NYcDQSRzKA99ffgdN+aT8/L6d63pYdsgtDmX/yrFWyLOVgW62LQpC/To4MTJAIgY/Rg /VjdifOJtYFvr+BKJwFCTfcviy4EQjsfHLnyJjvL9BiCXfSBXASc/Gn9WOTL5ZNpk4TStGXO +/2PIKeg228LtJ5vc/vemBo4hcjJv9ttX7dCebpSAbNo7GgOs8XNgJU2mEcra3IMT15dGk0/ KpGMx7bMinTIlxx/BAGt5M5w8OnNi4p2AcKzvH18OTE7Lssn5ub8Ains32hbUFf18hJbABEB AAG0K1ZsYWRpbWlyIFBhbnRlbGVldiA8Z3BnQHRoZWN5YmVyc2hhZG93Lm5ldD6JAVEEEwEI ADsCGwMFCwkIBwIGFQgJCgsCBBYCAwECHgECF4AWIQS77RsIjO1/lYkX++hQBPD60FFXbQUC WJ9eKQIZAQAKCRBQBPD60FFXbX0yB/9PEcY3H9mEZtU1UVqxLzPMVXUX5Khk6RD3Jt8/V7aA vu8VO4qwmnhadRPHXxVwnnVotao9d5U1zHw0gDhvJWelGRm52mKAPtyPwtBy4y3oXzymLfOM RIZxwxMY5RkbqdgWNEY7tCplABnWmaUMm5qDIjzkbEabpiqGySMy2gy6lQHUdRHcgFqO+ceZ R7IOPEh2fnVuQc5t1V56OHHRQZMQLgGupInST+svryv2sfr5+ZJqtwWL3nn8aFER6eIWzDDu m9y2RZnykbfwd56c81bpY6qqZtHkyt0hImkOwOiBj3UWtJvgZ95WnJ8NBPHPcttgL3vQTsXu BRYEjQZln81tuQENBFar2yQBCADFGh8NqHMtBT8F4m/UzQx0QAMDyPQN3CjKn67gW//8gd5v TmZCws2TwjaGlrJmwhGseUkZ368dth5vZLPu95MVSo2TBGf+XIVPsGzX6cuIRNtvQOT5YSUz uOghU0wh5gjw7evg7d0qfZRTZ2/JAuWmeTvPl66dasUoqKxVrq5o2MXdYkI6KoSxTsal3/36 ii5cl2GfzE+bVAj3MB8B0ktdIZCHAJT8n+8h10/5TD5oEkWjhWdATeWMrC2bZwFykgSKjY/3 jUvmfeyJp56sw5w3evZLQdQCo+NWoFGHdHBm0onyZbgbWS+2DEQI+ee0t6q6/iR1tf8VPX2U LY0jjiZ7ABEBAAGJAR8EGAEIAAkFAlar2yQCGwwACgkQUATw+tBRV200GQf8CaQxTy7OhWQ5 O47G3+yKuBxDnYoP9h+T/sKcWsOUgy7i/vbqfkJvrqME8rRiO9YB/1/no1KqXm+gq0rSeZjy DA3mk9pNKvreHX9VO1md4r/vZF6jTwxNI7K97T34hZJGUQqsGzd8kMAvrgP199tXGG2+NOXv ih44I0of/VFFklNmO87y/Vn5F8OfNzwiHLNleBXZ1bMp/QBMd3HtahZVk7xRMNAKYqkyvI/C z0kgoHYP9wKpSmbPXJ5Qq0ndAJ7KIRcIwwDcbh3/F9Icj/N3v0SpxuJO7l0KlXQIWQ7TSpaO liYT2ARnGHHYcE2OhA0ixGV3Y3suUhk+GQaRQoiytw== Message-ID: <961c2cca-8e06-fb74-2462-d2d1eb014193@gmail.com> Date: Sat, 6 Jul 2019 15:09:45 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <4a7c1c7b-bc1e-4aba-7a9d-581c0272aa86@gmx.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="BDFVxH2YkZpPWqGyRqWTaPG5rQemDq50q" Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --BDFVxH2YkZpPWqGyRqWTaPG5rQemDq50q Content-Type: multipart/mixed; boundary="EHfwkUcZm4BOcn5t2hCwgu5CnHSTl8Y5u"; protected-headers="v1" From: Vladimir Panteleev To: Qu Wenruo , linux-btrfs@vger.kernel.org Message-ID: <961c2cca-8e06-fb74-2462-d2d1eb014193@gmail.com> Subject: Re: "kernel BUG" and segmentation fault with "device delete" References: <966f5562-1993-2a4f-0d6d-5cea69d6e1c6@gmail.com> <8e009a0c-2c82-90c5-807a-bf3477e0b07a@gmx.com> <8c221f86-b550-fcd6-aef1-13570270a559@gmail.com> <4a7c1c7b-bc1e-4aba-7a9d-581c0272aa86@gmx.com> In-Reply-To: <4a7c1c7b-bc1e-4aba-7a9d-581c0272aa86@gmx.com> --EHfwkUcZm4BOcn5t2hCwgu5CnHSTl8Y5u Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 06/07/2019 05.51, Qu Wenruo wrote: >> The problem also manifests when attempting to rebalance the metadata. >=20 > Have you tried to balance just one or two metadata block groups? > E.g using -mdevid or -mvrange? If I use -mdevid with the device ID of the device I'm trying to remove=20 (2), I see the crash. If I use -mvrange with a range covering one byte past a problematic=20 virtual address, I see the crash. Not sure if you had anything else / specific in mind. Here is a log of=20 my experiments so far: https://dump.thecybershadow.net/da241fb4b6e743b01a7e9f8734f70d6e/scratch.= txt > And did the problem always happen at the same block group? Upon reviewing my logs, it looks like for "device remove" it always=20 tries to move block group 1998263943168 first, upon which it crashes. For "balance", it seems to vary - looks like there is at least one other = problematic block group at 48009543942144. Happy to do more experiments or test kernel patches. I have a VM set up=20 with a COW view of the devices, so I can do destructive tests too. --=20 Best regards, Vladimir --EHfwkUcZm4BOcn5t2hCwgu5CnHSTl8Y5u-- --BDFVxH2YkZpPWqGyRqWTaPG5rQemDq50q Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEu+0bCIztf5WJF/voUATw+tBRV20FAl0gubkACgkQUATw+tBR V23ADQgArNrC8r7VV2MEt0bwLAnMZMoM8cdnCAdUYAcVaXG5yw5GCgkyDpDr7MlV NHsd8x6Mhp5W7myiQmCU7jvJIT6iECnN04xp0mOMhdA9EdCkrRtlbtUBcQ4pj5l0 M9Xcbjm0szTVJzSREK2ItScDTO+zUGsx4a23N9wrkzcvKsNGQVgrNuGC3pXb+fa6 LJj7amPmoE3+kjhBAht6gJFtSnhik6RFdwq1wPqgQZxWXcHW0GmN2W33PfBExCGe cZy1WFvp8igrR9eh4Vf459AYLzjyDmxN70duzp4ZwA+FiJTVk1no0wULFGdBNJa4 6vr+3s089EtAQ6xG72vYPoB5XUKfKw== =rAJU -----END PGP SIGNATURE----- --BDFVxH2YkZpPWqGyRqWTaPG5rQemDq50q--