Package: src:linux Version: 3.14.7-1~bpo70+1 Severity: normal Greetings, Thanks for the back port kernels!
In a recent kernel version (3.14?) the xz compression BCJ filters became optional. 3.14-0.bpo.1-amd64 only has the X86 filter included (see config except below). Unfortunately this causes squashfs to fail in a misleading manner when a file is read from a squashfs filesystem that uses a filter not compiled into the kernel (see the -Xbcj flag to mksquashfs). When decompression of such a file occurs the error produced suggests that the squashfs filesystem is corrupt which, at least in my case, it is not (see dmesg excerpt below). This makes files in filesystems that use these filters (eg: filesystem images of embedded systems) unreadable. The misleading error message has been discussed (eg: https://lkml.org/lkml/2014/3/5/132) so forwarding this upstream is unneeded. If all the BCJ filters could be enabled (as they were before the option to disable them appeared) it would be much appreciated. I for one have a fair number of squashfs filesystems that use foreign architecture filters and unsquashfs'ing them instead of just mounting them reduces the utility of squashfs. Thanks! P.S. I've reduced the info below as this is a known issue and not related to the system these logs were taken on. I also booted to a shell as init to reduce the noise. If you feel that other information is relevant I can provide it. Here are the applicable kernel options: grep _XZ_ /boot/config-3.14-0.bpo.1-amd64: CONFIG_XZ_DEC=y CONFIG_XZ_DEC_X86=y # CONFIG_XZ_DEC_POWERPC is not set # CONFIG_XZ_DEC_IA64 is not set # CONFIG_XZ_DEC_ARM is not set # CONFIG_XZ_DEC_ARMTHUMB is not set # CONFIG_XZ_DEC_SPARC is not set CONFIG_XZ_DEC_BCJ=y # CONFIG_XZ_DEC_TEST is not set -- Package-specific info: ** Version: Linux version 3.14-0.bpo.1-amd64 (debian-ker...@lists.debian.org) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1 SMP Debian 3.14.7-1~bpo70+1 (2014-06-21) ** Command line: BOOT_IMAGE=/vmlinuz-3.14-0.bpo.1-amd64 root=/dev/mapper/vg0-root ro init=/bin/bash ** Not tainted ** Kernel log: ..snip.. [ 145.928009] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 155.419853] SQUASHFS error: xz decompression failed, data probably corrupt [ 155.421981] SQUASHFS error: squashfs_read_data failed to read block 0x3116 [ 155.424105] SQUASHFS error: Unable to read data cache entry [3116] [ 155.426239] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.428408] SQUASHFS error: Unable to read data cache entry [3116] [ 155.430134] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.431860] SQUASHFS error: Unable to read data cache entry [3116] [ 155.433573] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.435296] SQUASHFS error: Unable to read data cache entry [3116] [ 155.437020] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.438764] SQUASHFS error: Unable to read data cache entry [3116] [ 155.440231] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.441691] SQUASHFS error: Unable to read data cache entry [3116] [ 155.443157] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.444617] SQUASHFS error: Unable to read data cache entry [3116] [ 155.446068] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.447533] SQUASHFS error: Unable to read data cache entry [3116] [ 155.448999] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.450472] SQUASHFS error: Unable to read data cache entry [3116] [ 155.451940] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.453416] SQUASHFS error: Unable to read data cache entry [3116] [ 155.454847] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.456118] SQUASHFS error: Unable to read data cache entry [3116] [ 155.457387] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.458668] SQUASHFS error: Unable to read data cache entry [3116] [ 155.459948] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.461232] SQUASHFS error: Unable to read data cache entry [3116] [ 155.462525] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.463807] SQUASHFS error: Unable to read data cache entry [3116] [ 155.465077] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.466343] SQUASHFS error: Unable to read data cache entry [3116] [ 155.467544] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.468655] SQUASHFS error: Unable to read data cache entry [3116] [ 155.469757] SQUASHFS error: Unable to read page, block 3116, size 7578 [ 155.470864] SQUASHFS error: Unable to read data cache entry [3116] [ 155.471960] SQUASHFS error: Unable to read page, block 3116, size 7578 ** Loaded modules: squashfs loop nls_utf8 nls_cp437 vfat fat ext4 crc16 mbcache jbd2 btrfs xor raid6_pq sha256_ssse3 sha256_generic usb_storage hid_apple hid_generic usbhid hid dm_crypt dm_mod md_mod sg sd_mod crc_t10dif crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel ahci ghash_clmulni_intel libahci libata xhci_hcd aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd scsi_mod usbcore usb_common -- System Information: Debian Release: 7.5 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 3.14-0.bpo.1-amd64 (SMP w/4 CPU cores) Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1) Shell: /bin/sh linked to /bin/dash Versions of packages linux-image-3.14-0.bpo.1-amd64 depends on: ii debconf [debconf-2.0] 1.5.49 ii initramfs-tools [linux-initramfs-tool] 0.115~bpo70+1 ii kmod 9-3 ii linux-base 3.5 ii module-init-tools 9-3 Versions of packages linux-image-3.14-0.bpo.1-amd64 recommends: ii firmware-linux-free 3.2 Versions of packages linux-image-3.14-0.bpo.1-amd64 suggests: pn debian-kernel-handbook <none> pn grub-pc | extlinux | lilo <none> pn linux-doc-3.14 <none> Versions of packages linux-image-3.14-0.bpo.1-amd64 is related to: pn firmware-atheros <none> pn firmware-bnx2 <none> pn firmware-bnx2x <none> pn firmware-brcm80211 <none> pn firmware-intelwimax <none> pn firmware-ipw2x00 <none> pn firmware-ivtv <none> pn firmware-iwlwifi <none> pn firmware-libertas <none> ii firmware-linux 0.41~bpo70+1 ii firmware-linux-nonfree 0.41~bpo70+1 pn firmware-myricom <none> pn firmware-netxen <none> pn firmware-qlogic <none> pn firmware-ralink <none> pn firmware-realtek <none> pn xen-hypervisor <none> -- debconf information: linux-image-3.14-0.bpo.1-amd64/prerm/removing-running-kernel-3.14-0.bpo.1-amd64: true linux-image-3.14-0.bpo.1-amd64/postinst/depmod-error-initrd-3.14-0.bpo.1-amd64: false -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". 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