Hi, With the Linux Kernel version 5.8-rc5/master I am unable to mount some squashfs filesystems compressed with "-comp lz4". If I try to mount them I get the following error: [ 1.084246] SQUASHFS error: lz4 decompression failed, data probably corrupt [ 1.084545] SQUASHFS error: Failed to read block 0x873e1001: -5 [ 1.084761] SQUASHFS error: Unable to read metadata cache entry [873e0fff] [ 1.084983] SQUASHFS error: Unable to read directory block [873e0fff:1586] [ 1.122564] SQUASHFS error: Unable to read metadata cache entry [873e0fff] [ 1.122708] SQUASHFS error: Unable to read directory block [873e0fff:1586] [ 1.122862] Starting init: /sbin/init exists but couldn't execute it (error -5) [ 1.123027] SQUASHFS error: Unable to read metadata cache entry [873e0fff] [ 1.123152] SQUASHFS error: Unable to read directory block [873e0fff:1586] [ 1.123279] Starting init: /etc/init exists but couldn't execute it (error -5) [ 1.123444] SQUASHFS error: Unable to read metadata cache entry [873e0fff] [ 1.123573] SQUASHFS error: Unable to read directory block [873e0fff:1586] [ 1.123713] Starting init: /bin/init exists but couldn't execute it (error -5) [ 1.123900] SQUASHFS error: Unable to read metadata cache entry [873e0fff]
or [ 4960.910693] attempt to access beyond end of device [ 4960.910695] loop0: rw=2048, want=46, limit=40 [ 4960.910696] SQUASHFS error: Failed to read block 0x4001: -5 [ 4960.910697] SQUASHFS error: Unable to read metadata cache entry [3fff] [ 4960.910698] SQUASHFS error: Unable to read inode 0x20c5000c I bisected the issue to the commit "squashfs: migrate from ll_rw_block usage to BIO" https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/squashfs?id=93e72b3c612adcaca13d874fcc86c53e6c8da541 The issue can be reproduced by downloading https://theworldsend.eu/demo.squashfs (20K) and the following command line. # mount demo.squashfs mnt && ls mnt && umount mnt The same squashfs can be mounted using Linux <=5.7.8. The kernel config is identical to the Arch Linux Kernel configuration, build using gcc 9 and 10 on x86_64. Best regards, Bernd Amend
