Bug 1242853

Summary:	mount-loop failed to setup loop device: No such file or directory
Product:	Red Hat Enterprise Linux 7	Reporter:	Hu Zhang <huzhan>
Component:	libguestfs	Assignee:	Richard W.M. Jones <rjones>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.2	CC:	fdeutsch, leiwang, linl, ptoscano, sherold, wshi, xchen
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	libguestfs-1.31.7-2.el7.x86_64	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-03 17:54:30 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1165785, 1218766
Bug Blocks:	1288337, 1301891

Description Hu Zhang 2015-07-14 09:25:35 UTC

Description of problem:
"mount-loop" fails to mount a filesystem image. It returns "failed to setup loop device: No such file or directory". Same as Bug 1011907.

Version-Release number of selected component (if applicable):
kernel-3.10.0-290.el7.x86_64
libguestfs-1.28.1-1.46.el7.x86_64
libguestfs-winsupport-7.2-1.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. # qemu-img create test-loop.raw 100M
   # qemu-img create test.raw 500M

2. # guestfish -a test-loop.raw
   ><fs> part-disk /dev/sda mbr
   ><fs> mkfs ext3 /dev/sda
   ><fs> mount /dev/sda /
   ><fs> exit

3. # guestfish -a test.raw -vx
   ><fs> part-disk /dev/sda mbr
   ><fs> mkfs ext3 /dev/sda1
   ><fs> mount /dev/sda /
   ><fs> upload /path/to/test-loop.raw /test-loop.raw
   ><fs> mkmountpoint /loop
   ><fs> mount-loop /test-loop.raw /loop/
  
Actual results:
In step 3,
><fs> mount-loop /test-loop.raw /loop/
libguestfs: trace: mount_loop "/test-loop.raw" "/loop/"
guestfsd: error: /test-loop.raw on /loop/: mount: /sysroot/test-loop.raw: failed to setup loop device: No such file or directory
libguestfs: trace: mount_loop = -1 (error)
libguestfs: error: mount_loop: /test.raw on /loop/: mount: /sysroot/test-loop.raw: failed to setup loop device: No such file or directory

Expected results:
In step 3, mount-loop can mount the image to the mount point successfully.

Additional info:

Comment 2 Richard W.M. Jones 2015-07-14 09:55:06 UTC

This works if you run:

><fs> modprobe loop
><fs> mount-loop /test-loop.raw /loop

It probably means we are missing a udev rule somewhere.

I can only reproduce the bug on RHEL 7.2, not on Fedora.

Comment 3 Pino Toscano 2015-10-19 13:22:17 UTC

This is basically the RHEL version of bug #1165785.

The fix (commit 3dabc7a7bae709e884b56e297e7ece222e653d0c) is part of libguestfs >= 1.29.9, and thus it will be picked by the rebase (bug #1218766).

I just sent the small instructions this bug as regression test case, so we can check this keeps working:
  https://www.redhat.com/archives/libguestfs/2015-October/msg00198.html

Comment 7 Xianghua Chen 2016-06-28 05:50:02 UTC

Verified with the packages:
libguestfs-1.32.5-6.el7.x86_64

Verify steps:
1. # qemu-img create test-loop.raw 100M
   # qemu-img create test.raw 500M

2. # guestfish -a test-loop.raw
   ><fs> part-disk /dev/sda mbr
   ><fs> mkfs ext3 /dev/sda
   ><fs> mount /dev/sda /
   ><fs> exit

3. # guestfish -a test.raw 
   ><fs> part-disk /dev/sda mbr
   ><fs> mkfs ext3 /dev/sda
   ><fs> mount /dev/sda /
   ><fs> upload /path/to/test-loop.raw /test-loop.raw
   ><fs> mkmountpoint /loop
   ><fs> mount-loop /test-loop.raw /loop/

Commands finished successfully.

So Verified.

Comment 9 errata-xmlrpc 2016-11-03 17:54:30 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2576.html