Package: e2fsprogs Version: 1.45.6-1 Severity: wishlist File: /sbin/e2fsck With a read-only filesystem and the shared_blocks option set, e2fsck allows multiply referenced blocks; however, it doesn't like multiple references to inode bitmap blocks or block bitmap blocks. Deduplicating such blocks works fine with the kernel implementation, and every other part of e2fsprogs seems fine with it, but e2fsck complains:
ext2fs_check_desc: Corrupt group descriptor: bad block for inode bitmap e2fsck: Group descriptors look bad... trying backup blocks... e2fsck: Bad magic number in super-block while using the backup blockse2fsck: going back to original superblock disk.img: clean, 71136/71136 files, 292051/292051 blocks I tried a quick hack to ignore the ext2fs_test_block_bitmap2 checks in ext2fs_check_desc if ext2fs_has_feature_shared_blocks(fs->super) (entirely ignoring the unshare_blocks option), and that allows e2fsck to pass without any complaint: disk.img: clean, 71136/71136 files, 292051/292051 blocks Please consider supporting this case in e2fsck. -- System Information: Debian Release: bullseye/sid APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 5.4.0-4-amd64 (SMP w/4 CPU cores) Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages e2fsprogs depends on: ii libblkid1 2.34-0.1 ii libc6 2.30-4 ii libcom-err2 1.45.6-1 ii libext2fs2 1.45.6-1 ii libss2 1.45.6-1 ii libuuid1 2.34-0.1 ii logsave 1.45.6-1 Versions of packages e2fsprogs recommends: pn e2fsprogs-l10n <none> Versions of packages e2fsprogs suggests: pn e2fsck-static <none> pn fuse2fs <none> pn gpart <none> ii parted 3.3-4 -- no debconf information
