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** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1828712
Title:
I/O errors when trying to loop mount an image
Status in linux package in Ubuntu:
Incomplete
Bug description:
Command
sudo mount -t vfat flop1 /mnt/flop1
fails. The image is readable but the log shows many I/O errors such as
May 12 07:57:24 us64a kernel: [69801.335823] print_req_error: I/O error, dev
loop0, sector 0
May 12 07:57:24 us64a kernel: [69801.337707] print_req_error: I/O error, dev
loop0, sector 0
May 12 07:57:24 us64a kernel: [69801.339521] FAT-fs (loop0): unable to read
boot sector
May 12 07:57:24 us64a kernel: [69801.342063] print_req_error: I/O error, dev
loop0, sector 0
May 12 07:57:24 us64a kernel: [69801.343891] Buffer I/O error on dev loop0,
logical block 0, async page read
May 12 07:57:24 us64a kernel: [69801.345974] print_req_error: I/O error, dev
loop0, sector 1
May 12 07:57:24 us64a kernel: [69801.347832] Buffer I/O error on dev loop0,
logical block 1, async page read
May 12 07:57:24 us64a kernel: [69801.349928] print_req_error: I/O error, dev
loop0, sector 2
May 12 07:57:24 us64a kernel: [69801.351818] Buffer I/O error on dev loop0,
logical block 2, async page read
May 12 07:57:24 us64a kernel: [69801.356103] print_req_error: I/O error, dev
loop0, sector 3
May 12 07:57:24 us64a kernel: [69801.356109] Buffer I/O error on dev loop0,
logical block 3, async page read
May 12 07:57:24 us64a kernel: [69801.356117] print_req_error: I/O error, dev
loop0, sector 4
May 12 07:57:24 us64a kernel: [69801.356119] Buffer I/O error on dev loop0,
logical block 4, async page read
May 12 07:57:24 us64a kernel: [69801.356122] print_req_error: I/O error, dev
loop0, sector 5
May 12 07:57:24 us64a kernel: [69801.356125] Buffer I/O error on dev loop0,
logical block 5, async page read
May 12 07:57:24 us64a kernel: [69801.356128] print_req_error: I/O error, dev
loop0, sector 6
May 12 07:57:24 us64a kernel: [69801.356130] Buffer I/O error on dev loop0,
logical block 6, async page read
May 12 07:57:24 us64a kernel: [69801.356134] print_req_error: I/O error, dev
loop0, sector 7
May 12 07:57:24 us64a kernel: [69801.356136] Buffer I/O error on dev loop0,
logical block 7, async page read
May 12 07:57:24 us64a kernel: [69801.356260] Buffer I/O error on dev loop0,
logical block 0, async page read
May 12 07:57:24 us64a kernel: [69801.356263] Buffer I/O error on dev loop0,
logical block 1, async page read
The command, understandably, reports "can't read superblock on
/dev/loop0". The problem happens even on newly created images. Here's
a sample set of commands and responses:
$ mkfs.msdos -C flop1 1440
$ ls -l
-rwxrwxrwx 1 root root 1474560 May 10 18:49 flop1
$ hd flop1
<--- output looks reasonable including 55 aa and two FATs --->
$ sudo mkdir /mnt/flop1
$ sudo mount -o loop flop1 /mnt/flop1
mount: /mnt/flop1: can't read superblock on /dev/loop0.
$ losetup -f
/dev/loop0
$
I see plenty of reports of similar on different websites but without
resolution, including one on Launchpad but where the OP stopped
responding so it did not get resolved. I don't know when this problem
started to occur on this machine.
If it's relevant, this is running under VirtualBox which reports
itself as Version 5.2.26 r128414 (Qt5.6.2) with their 'host
extensions' enabled. However, mounting a floppy image previously
worked on this virtual machine.
I have rebooted with /forcefsck to check the root (and only)
filesystem. I have upgraded to the latest LTS Ubuntu, as below, but
the problem persists.
System info:
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Codename: bionic
Linux us64a 4.18.0-18-generic #19~18.04.1-Ubuntu SMP Fri Apr 5
10:22:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
The machine is command-line only, i.e. no windowing.
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