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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2023925
Title:
SQUASHFS error: squashfs_read_data failed to read block
Status in linux package in Ubuntu:
Incomplete
Bug description:
We've had system relying on reading data from squashfs that's been
stable for a number of years. We've recently noticed that when running
on machines that include the patch set from
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2015511 that we
start to see error messages of the following shape:
SQUASHFS error: squashfs_read_data failed to read block
Machines showing the problem are all running kernel 5.4.0-150-generic
Machines NOT having any problems with the SAME workloads are running a
mix of the following kernels:
5.15.0-52-generic
5.15.0-53-generic
5.4.0-100-generic
5.4.0-104-generic
5.4.0-105-generic
5.4.0-125-generic
5.4.0-137-generic
5.4.0-147-generic
I'm not able to reproduce the failure on demand.
What is suspicious to me from that change set is that the following 2
patches are applied:
squashfs: harden sanity check in squashfs_read_xattr_id_table
Squashfs: fix handling and sanity checking of xattr_ids count
and then only 1 of them is reverted, although the patches in question
appear to be related:
revert "squashfs: harden sanity check in squashfs_read_xattr_id_table"
In addition to 5.4.0-149.166, it appears the same surviving patch was
also pulled into the following Ubuntu kernel builds:
5.15.0-72.79
5.19.0-42.43
Additional data from one of the problem machines:
# lsb_release -rd
Description: Ubuntu 20.04.6 LTS
Release: 20.04
# cat /proc/version_signature
Ubuntu 5.4.0-150.167-generic 5.4.233
Relevant lines from dmesg:
[964961.979932] SQUASHFS error: squashfs_read_data failed to read block
0x52ca3e42
[964961.987247] SQUASHFS error: Unable to read data cache entry [52ca3e42]
[964961.993872] SQUASHFS error: Unable to read page, block 52ca3e42, size d674
[1051130.734432] SQUASHFS error: squashfs_read_data failed to read block
0xdd6d9c3
[1100614.200893] SQUASHFS error: squashfs_read_data failed to read block
0x239673b7
[1100614.208305] SQUASHFS error: Unable to read data cache entry [239673b7]
[1100614.215017] SQUASHFS error: Unable to read page, block 239673b7, size
12fba
[1100614.222170] SQUASHFS error: Unable to read data cache entry [239673b7]
[1100614.228870] SQUASHFS error: Unable to read page, block 239673b7, size
12fba
[1100614.236007] SQUASHFS error: Unable to read data cache entry [239673b7]
[1100614.242711] SQUASHFS error: Unable to read page, block 239673b7, size
12fba
[1100634.392881] SQUASHFS error: squashfs_read_data failed to read block
0x1746ee61
[1100634.400287] SQUASHFS error: Unable to read data cache entry [1746ee61]
[1100634.406994] SQUASHFS error: Unable to read page, block 1746ee61, size
111f3
[1100634.414163] SQUASHFS error: Unable to read data cache entry [1746ee61]
[1100634.420867] SQUASHFS error: Unable to read page, block 1746ee61, size
111f3
[1100634.428044] SQUASHFS error: Unable to read data cache entry [1746ee61]
[1100634.434757] SQUASHFS error: Unable to read page, block 1746ee61, size
111f3
[1100634.647016] SQUASHFS error: squashfs_read_data failed to read block
0x3afd7129
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