Hi all, I have a bcachefs filesystem with --replicas=2, 2 SSDs serving as the foreground_target and promote_target in --group=ssd, and 2 SMR drives + 2 regular drives as the background_target in --group=hdd. I'm using the bcachefs kernel and tools in NixOS, which uses: buildLinux (args // rec { version = "4.15.2018.04.14"; modDirVersion = "4.15.0"; extraMeta.branch = "master"; src = fetchgit { url = "https://evilpiepirate.org/git/bcachefs.git"; rev = "3b7c824e9330a640312fce1b04537c684c1d602c"; sha256 = "1l5ib28qkhrxggn6zj9b2839543anbxk2ip75yizgzlv9vr5m4pk"; }; as the kernel, and stdenv.mkDerivation rec { name = "bcachefs-tools-unstable-2018-04-10"; src = fetchgit { url = "https://evilpiepirate.org/git/bcachefs-tools.git"; rev = "c598d91dcb0c7e95abdacb2711898ae14ab52ca1"; sha256 = "1mglw6p1145nryn8babkg2hj778kqa0vrzjbdp9kxjlyb3fksmff"; }; for the tools. After rebooting, I ran into an unmountable filesystem, running bcachefs fsck -vp gives a ton of regular fsck output, then errors out: deleting inode 1391501 deleting inode 1391502 deleting inode 1391503 deleting inode 1391504 deleting inode 1391505 deleting inode 1391506 deleting inode 1391507 deleting inode 1391508 deleting inode 1391509 Saw 388 errors like: unreachable directory found (inum 1391191) fsck done bcachefs: include/linux/mempool.h:37: mempool_alloc: Assertion `!(!pool->elem_size)' failed. And trying to remount after the fsck gives: mount: /opt: wrong fs type, bad option, bad superblock on /dev/sda:/dev/sdb4:/dev/sdc:/dev/sdd:/dev/sde:/dev/sdf, missing codepage or helper program, or other error. Is the fix for this included in newer branches? Or any other ideas on how to recover this? Let me know what other info might be useful for this. Thanks, Mitch -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html