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([2a01:e0a:1f1:c2f1:c5ba:1dac:b80:6348]) by smtp.gmail.com with ESMTPSA id q10sm228047wme.16.2020.01.27.13.59.33 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Jan 2020 13:59:33 -0800 (PST) Subject: Re: Endless mount and backpointer mismatch References: To: linux-btrfs@vger.kernel.org From: Pepie 34 Autocrypt: addr=pepie34@gmail.com; prefer-encrypt=mutual; keydata= mQSuBFEmK5ARDAD3XyOHhGTnh2z/tsNq3RYTavJmjYRWA2BsQfLyPEyT56rjhMLUg4zSY0Dq zuBs4LHxqKlazZ2d0VikYdL2Z8+HCsPMpjo729dqAe9seu6estdbuUqGWkNcs0cz9WMaE6Tg C3fYKPQEi4RV05SftH0NQJZciz7KHmqlqy+dyzeaXKaYUnawaJSDn9xjZKGP9nj0sqM5gexC jItK9nLB/TmJqDrGg5TzIjqoYqGg/pLvSDCoZSF6EeyO/Dk/vvf2a5bUBR3QP/OFmapXqAuf EUUuVOhQaW02DMi5Dc8c2Kn0JS1PnN0vJP3kJ6zZD2FmKOwKGuuw30nYkI2nHopbPRXjnc4O 27jb3KK+Fy6jq+VN0JblgdF3bYOC0YrbEaxuA2EW7XtYFY0/T4r+bFKjrbsPnbEaFDbXvONY VjqQwWQDWL0dCjNU0Kft7lOKw5oLumoZOWBenXKTIFa7o6Ah5k8ov33vREFa7FPF0ZI0Ypyf 7zDguseuEEcjkjHo0nhdRWcBANvCEJwLkcAxV+WoPFohK+03vpFX8H5Tp6OtfHyRstBHDADI kO3yn26VfTmsUHGk8WAcfr6CIk1Hc2u/N3mnQ6tROV69WuhM+fuaXNS066qiyhTKSdQmUakZ 6Ws5nWcG0SELjQmPJOS6fi+V+IolEELKFutyxHAwUFuyNdW5WIRm+NoEVF8sjrM4Fb72ZyG2 h6Ysu8i0P/WCRt8OigYdi14XGYS/242CIEGtMj56LdWsc6Xm5KuwkULLqETeb7Dnm5GfXImY IoTNbgiu64jwzQHyeoqFg5GxdteLu2BYuZLtidNipm2GtUyXLxsTJyfLClWGAvTUiqG57IGh o77SQR11e/yixNtPbJnC/eYoTTFPbTjl+cA+LQSWZbPn47t5YG7nPQZY8dO3kwSnxBFFmRBW CK9vxochc+T9JK9NAOVGjXAuv914Hh0PZ1F/hEqdpjt1bS+4W0IzO4fn3F1u8W84uObBqu4p gLo2T/kEQ88/ACroGe3V0F6M9K8OrzgT8uFXeDocXp26tmougzDD9DI0GvU+mm1wvZGm7yxV xFMytlgMALUXBB2Cz67iQY2BmXd94p4yNRfFRJCYS3Yq3iP7d6CbTOkMUovGKQhV4R+6ET5u K1jYtWK+tegEI7n3Mr8xHP3eEWDC3WTjldW+aocfSj9eJ63YCajBmRZnuk9CV0l80e2dnVEM MuzPuru+tnKCD/Y3QoLL4sRvDIfPLLmLab18Y+dPr3PfeaqNpOvLmEiD2dwWRcpeJHzsuNra UhWUXxjwww0ujPTT/c2oybJj8EkL1Z9lFIyECaS5mZrWvdwYLS1dck74cnuSM1rO5c47GoZO CXaTNI15mDpecRp0Cch8ye/JL0gtx8dMenkcTAF+n3OSUJlZuQDyZRy0QZCbv5UolAIE8a37 rVMVmhrJGIryfTw82zI/BSKDzaf1PFLntEJbulZ+HiHu/zGL6c4DJuwXVZLhwFPiAl6X4TpX 7/xB0daQDw81GHQrwOo+67R0s1dJa62k4B8wtomhSotfTLbtJqJd41n/i9EaQ+Ibnh4kyzlC VQw+Nld5bWoUekvGdLQcUGVwaWUgMzQgPHBlcGllMzRAZ21haWwuY29tPoiABBMRCAAoAhsD BgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAUCWniuXwUJEs54oAAKCRBfWXmLLmJQaQFgAP9G V5dG81DWgwppAJ9ePEg4h+5wnGNpCNZZa/AZC+FmpgD/a5XYVKI2fUNLZUm8sLFvo11oAdqA dze+aew6O0KYuem5Aw0EUSYrkBAMAJrIK0qTqZfdTvR7tONeyOd+rO4szdPiceKcG4EjwzD9 s/BusfcEIGmZ/gYbVhbhKdisqaiPAGawW+gDKRfTQjjHE8fmsWJ1JxizCbt4GvmQI9UHmnTj c7YfisLEAEYhx5+WO6wu33w/6yGKVPQy8xB/94qnRCHrx1qy+WfPV8GzifLIRpBRxjdUHbhI PrAqD1x/sjLnQENKanOTdC/R/uGQeqjVY+FyN5QNa/nPSGzL8M8jfw5SnzM2csWtxlh1wju0 Km137idWOd8IR7wrsHzGGreEeqm3mTkgBRiEJwE20v9c3qKiizHQRjdl6hTHPNlPii/Uj5mc FyymVCCkeV5mk1ZKEtdxNA2KFOwEMvTSOqBWHMND/RmFzPBUpJ4PDzih5KoKCRWAyxB1cMk7 l/ZSNPs1xSBzFqg1MWYt9p0XSW7GqT/BsceOXYA3s2Vtkh3iAkAvQprtsyxIkmq+sIt/fjk7 WcIPZnizFgLxVw1Sj5lyAwYdtwZkpokrTsq4jwADBwv+MSI5UaI24555caWGJbfxHuWkKipP uHxXRZ78efC0j32JOp4O1w7IAZMCXQY6VS2dCD6uvQYn1owCBWM6Tj8GczwSFv2r4kLtRfTq Voc6lB/9SE87EfEHKXCp9zfokCYXn6N8NiRjL9tDkF3s7FRv/9PuzqpC3L6phZSOdgg06raz TTylGWHeoe6k+N+UUijIiDvbKQzIK9VXNjlHou8GxWT4ohODvgtAUfB5qicywJcR5pQt4D1P 713UaVpbL3bwcnY8AM1zIicDjPFI2kT3UnTe8d9qP8UQHhG5o4lqb6v94Wgkq9dWw7UjmNQx AbOTviQ9kV4lySRzVhpa+6peYwmDX99EumzP/P4ZZtNVMfyXvZ++BGOkP4FWLXRIQQA7Dsv/ I0OIcXV+P7Voi+h6IAFo8tGLASijsFDVUlpdeYHgF9HGVkJCpwiN33Sfe4zSWB8tgDrssrry hV2tVc1vyD1GGpsLVe8uK0Z4/7V8be3+wJTU7nIWhzjBOz33JXcwiGcEGBEIAA8CGwwFAlp4 rmMFCRLOeKAACgkQX1l5iy5iUGk3QQD+KcTdBEU6/mF2NFYO0VPXW21mLNCaQi3wpdLSXdpe SsMBAK5D2mFcjVB8zVAl2D82QO5Wd9Vq6+HJ1+JdXbddA99t Message-ID: <46459688-6aed-7ec5-0bdd-97ff76fc13cb@gmail.com> Date: Mon, 27 Jan 2020 22:59:33 +0100 User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.24) Gecko/20100317 Thunderbird/2.0.0.24 Mnenhy/0.7.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: fr-FR Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Le 27/01/2020 =C3=A0 22:48, Chris Murphy a =C3=A9crit=C2=A0: > On Mon, Jan 27, 2020 at 2:20 PM Pepie 34 wrote: >> Dear BTRFS community, >> >> I've a raid 1 setup on two luks encrypted drives for 4 years that serv= es >> me as btrbk backup target from an other computer. >> There is a lot of ro snaptshots on it. >> >> I've mistakenly launched a balance on it which was extremely slow and >> tried to cancelled it. >> After two days of cancelling without results, I decided to power off t= he >> computer. >> >> After the reboot, even with the skip_balance mount option, the mountin= g >> is endless, no error in the kernel message and it never mounts. >> >> What I have done so far: >> - mount the volume with the ro option (fast to mount, data OK). >> - scrub in ro mode, no error found >> - btrfs check >> In the extent check there is plenty of errors like this : >> =3D> >> ref mismatch on [9404816285696 32768] extent item 6, found 5 >> >> incorrect local backref count on 9404816285696 parent 5712684302336 >> owner 0 offset 0 found 0 wanted 1 back 0x55f371ee1ad0 >> backref disk bytenr does not match extent record, bytenr=3D94048162856= 96, >> ref bytenr=3D0 >> backpointer mismatch on [9404816285696 32768] >> <=3D >> No errors in other checks, though checking "quota groups" is very slow= =2E >> >> What should I do ? btrfs check --repair ? >> btrfs check --init-extent-tree ? >> btrfs --clear-space-cache ? > None of the above. > > What kernel version and btrfs-progs? Newer kernels should have better > performance with quota enabled and many snapshots, even though I think > that combination is still not advised for performance reasons. Older > kernel might have a known bug related to the behavior you're > experiencing, but we need to know the versions. > > > Kernel : 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u2 (2019-11-11) x86_64 GNU/Linux btrfs-progs: 4.20.1-2 I'm on debian buster. Note that I don't really care about perf now, I mainly want to mount r/w my volume. With the same setup raid1 / luks=C2=A0 / quota, it was fast to mount and = use before the failed balancing. (mount took about 2s... ) Now it is not mounting at all (except with ro) Best regards, Pepie 34