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[69.171.146.205]) by smtp.gmail.com with UTF8SMTPSA id 6a1803df08f44-88652b6d7b0sm93498616d6.41.2025.12.01.18.01.51 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Dec 2025 18:01:51 -0800 (PST) From: Nicholas D Steeves To: linux-btrfs@vger.kernel.org Subject: Does Linux-6.12 have the missing dev = single/degraded chunk bug? Date: Mon, 01 Dec 2025 21:01:44 -0500 Message-ID: <87ldjliquv.fsf@gmail.com> Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" --=-=-= Content-Type: text/plain Hi, I'm reviewing documentation of outstanding bugs and workarounds, and I'm wondering what the state of the single/degraded chunk bug is for Linux-6.12. Specifically, I seem to remember that the users/sysadmins had to resolve a raid1 with a missing device the next time the system rebooted. So the reproducer was: 1. Device disappears. 2. Reboot occurs. 3. Filesystem fails to mount due to missing device. Thus 4. Sysadmin mounts with "-o degraded" and btrfs writes profile=single chunks. 5. For whatever reasons sysadmin doesn't succeed in replacing the missing device and rebalancing both data and metadata. 6. System reboots a second time. 7. The btrfs volume is now permanently read-only. I vaguely remember that profile=degraded chunks may have been introduced some time between 2022 and now. Does this mean state #7 no longer occurs, because profile=degraded chunks are written at state #4, and that a sysadmin can still add a new device and rebalance after the second reboot? Finally, are raid1, raid10, and raid1c3 and raid1c4 all comparably mature at this point? Regards, Nicholas --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJHBAEBCgAxFiEE4qYmHjkArtfNxmcIWogwR199EGEFAmkuSIgTHG5zdGVldmVz QGdtYWlsLmNvbQAKCRBaiDBHX30QYWSbD/93B2TIx3u1EKuYv0H9AwBdPDKKS1qB EgxrMGK40AOQxFp8SaNSRj2Mgm7G5Vv8bG6YcMWpw+0rX/+2IYChcDcDq6fd56Jk dkbvzIMBGN7A9lIRIhyDXprn5VXXMWEf7FFdVrgtp8JPOtk6AVOhzIzPOIbm60oC Dr5UKU7mZnoemCVtVKztvA/YoaFR0eijE9eMu2V57dOSfqoMT3d9qETDRKt3YYDf 2O4sruXPShGiXSoyUAIox8oYUxNmbui1pmVlepoxQF19+yGA8Zq6OSZRfUIjIJ6h QvwylZGGNcHj1sHY8vcYl3JkFwjW6SDTXiTdpnK9qpx//P1eRnsOvuWEWOl77x0g LO5wm7DSmAy2kXD1SkCCoVSWsM14HCCHGswXJJS20f71PWN7PGKiJWpNthQFS6fG jnNv8cgne16RnXjTQm+KcGSxuaWHdUT8Ko3TMCg/x0CCJmGK9TBmlVSkm+wMrTIA IGZyr1/5MsKiU63iq16dk7MvBkdY1IR8YCH00TTzaBaDZ7YG48OPcZF7E0iDZBtX Ys/dDPzNI4Lnp0J4Jwu4Q9uiPfsaXXUpi4oiZnCmjFz6uT7lzFsCFSPgjKm6aoQE lxsfu8tp9WaV5qVmIjAFHMReqd2WqnVw4PUJYndZLeX4NMgFx1sFqwCuejl6mcYQ 4aODuQO7pjEUVg== =Nni6 -----END PGP SIGNATURE----- --=-=-=--