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Bug 1566432 - [RHEL-7.5] losetup: /dev/loop1: failed to set up loop device
Summary: [RHEL-7.5] losetup: /dev/loop1: failed to set up loop device
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: util-linux
Version: 7.5
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: rc
: ---
Assignee: Karel Zak
QA Contact: Radka Brychtova
URL:
Whiteboard:
Depends On:
Blocks: 1614364
TreeView+ depends on / blocked
 
Reported: 2018-04-12 10:02 UTC by xhe@redhat.com
Modified: 2018-10-30 10:53 UTC (History)
2 users (show)

Fixed In Version: util-linux-2.23.2-56.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1614364 (view as bug list)
Environment:
Last Closed: 2018-10-30 10:52:39 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:3178 0 None None None 2018-10-30 10:53:27 UTC

Description xhe@redhat.com 2018-04-12 10:02:42 UTC 
Description of problem:
losetup: /dev/loop1: failed to set up loop device: No such device or address

Version-Release number of selected component (if applicable):
util-linux-2.23.2-52.el7.x86_64

How reproducible:
not sure

Steps to Reproduce:
1. generate a local file with dd
# dd if=/dev/zero of=/tmp/tfile_loop1 bs=1M count=1000
2. associate loop1 device to local file
losetup /dev/loop1 -f /tmp/tfile_loop1 

Actual results:
# losetup -a
/dev/loop0: [64768]:1001699 (/tmp/tfile_loop0)

# lsblk
NAME                                        MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda                                           8:0    1 465.8G  0 disk  
├─sda1                                        8:1    1     1G  0 part  /boot
└─sda2                                        8:2    1 464.8G  0 part  
  ├─rhel_storageqe--52-root                 253:0    0    50G  0 lvm   /
  ├─rhel_storageqe--52-swap                 253:1    0   3.9G  0 lvm   [SWAP]
  └─rhel_storageqe--52-home                 253:2    0 410.9G  0 lvm   /home
sr0                                          11:0    1  1024M  0 rom   
loop0                                         7:0    0  1000M  0 loop  
└─luks-d34a76ac-538b-4e10-814f-9682613935b8 253:3    0   998M  0 crypt 

# losetup /dev/loop1 -f /tmp/tfile_loop1 
losetup: /dev/loop1: failed to set up loop device: No such file or directory

# losetup --find
/dev/loop1

# strace losetup /dev/loop1 -f /tmp/tfile_loop1
execve("/usr/sbin/losetup", ["losetup", "/dev/loop1", "-f", "/tmp/tfile_loop1"], [/* 39 vars */]) = 0
brk(NULL)                               = 0x1375000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f97bec4a000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=44171, ...}) = 0
mmap(NULL, 44171, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f97bec3f000
close(3)                                = 0
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340$\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2151832, ...}) = 0
mmap(NULL, 3981792, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f97be65d000
mprotect(0x7f97be820000, 2093056, PROT_NONE) = 0
mmap(0x7f97bea1f000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c2000) = 0x7f97bea1f000
mmap(0x7f97bea25000, 16864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f97bea25000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f97bec3e000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f97bec3c000
arch_prctl(ARCH_SET_FS, 0x7f97bec3c740) = 0
mprotect(0x7f97bea1f000, 16384, PROT_READ) = 0
mprotect(0x611000, 4096, PROT_READ)     = 0
mprotect(0x7f97bec4b000, 4096, PROT_READ) = 0
munmap(0x7f97bec3f000, 44171)           = 0
brk(NULL)                               = 0x1375000
brk(0x1396000)                          = 0x1396000
brk(NULL)                               = 0x1396000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=106070960, ...}) = 0
mmap(NULL, 106070960, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f97b8134000
close(3)                                = 0
stat("/sys/block", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
uname({sysname="Linux", nodename="storageqe-52.rhts.eng.pek2.redhat.com", ...}) = 0
stat("/dev/loop-control", {st_mode=S_IFCHR|0660, st_rdev=makedev(10, 237), ...}) = 0
open("/dev/loop-control", O_RDWR|O_CLOEXEC) = 3
ioctl(3, LOOP_CTL_GET_FREE)             = 1
close(3)                                = 0
readlink("/dev", 0x7ffce763d7d0, 4096)  = -1 EINVAL (Invalid argument)
readlink("/dev/loop1", 0x7ffce763d7d0, 4096) = -1 EINVAL (Invalid argument)
open("/dev/loop1", O_RDWR|O_CLOEXEC)    = 3
open("/dev/loop1", O_RDWR|O_CLOEXEC)    = 4
ioctl(4, LOOP_SET_FD, 3)                = -1 EBUSY (Device or resource busy)
close(3)                                = 0
ioctl(4, LOOP_CLR_FD)                   = -1 ENXIO (No such device or address)
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2502, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f97bec49000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2502
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x7f97bec49000, 4096)            = 0
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/util-linux.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, "losetup: ", 9losetup: )                = 9
write(2, "/dev/loop1: failed to set up loo"..., 40/dev/loop1: failed to set up loop device) = 40
write(2, ": ", 2: )                       = 2
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, "No such device or address\n", 26No such device or address
) = 26
close(4)                                = 0
close(1)                                = 0
close(2)                                = 0
exit_group(1)                           = ?
+++ exited with 1 +++

Expected results:
no error

Additional info:
Comment 2 Karel Zak 2018-06-07 10:09:24 UTC 
The command 

   losetup /dev/loop1 -f /tmp/tfile_loop1 

does not make sense. The option -f is mutually exclusive to <device>. You cannot force losetup to use loop1 and in the same time ask to use the first free device (-f).

The right way is:

  losetup /dev/loop1 /tmp/tfile_loop1

or
  
  losetup -f /tmp/tfile


Yes, losetup should be more smart when it checks command line options. The current behaviour when it tries to blindly use <device> as well as -f is stupid.

This issue is improved by upstream commit c3f5a0f1d47dbc47f6d21da232d4eb1cfb7905db.
Comment 8 errata-xmlrpc 2018-10-30 10:52:39 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://access.redhat.com/errata/RHBA-2018:3178
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