[Bug 1469143] [NEW] kpartx -d fails with image paths longer than 63 characters
Public bug reported:
$ apt-show-versions multipath-tools
multipath-tools:amd64/vivid 0.4.9-3ubuntu12 uptodate
Reproduce:
Mount an image from a path longer than 63 chars succeeds:
$ sudo kpartx -av
asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12asdf13/disk.img
add map loop0p1 (252:0): 0 409600 linear /dev/loop0 2048
add map loop0p2 (252:1): 0 2 linear /dev/loop0 411648
add map loop0p5 : 0 819200 linear /dev/loop0 413696
add map loop0p6 : 0 819200 linear /dev/loop0 1234944
add map loop0p7 : 0 819200 linear /dev/loop0 2056192
add map loop0p8 : 0 1316864 linear /dev/loop0 2877440
but dismounting fails:
$ sudo kpartx -dv
asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12asdf13/disk.img
strace shows that the parameter on the dismount appears to get cut at 63 chars:
ioctl(3, DM_LIST_VERSIONS, 0x15b89b0) = 0
stat(asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12asdf13/disk.img,
{st_mode=S_IFREG|0644, st_size=2147483648, ...}) = 0
stat(/dev/loop0, {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0
open(/dev/loop0, O_RDONLY)= 4
ioctl(4, LOOP_GET_STATUS, {number=0, offset=0, flags=0,
name=asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12a, ...}) = 0
close(4)= 0
stat(/dev/loop1, {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 1), ...}) = 0
open(/dev/loop1, O_RDONLY)= 4
ioctl(4, LOOP_GET_STATUS, {number=0, offset=0, flags=0,
name=asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12a, ...}) =
-1 ENXIO (No such device or address)
if the path is 63 chars or less, the dismount also succeeds.
This is quickly becomes an issue if you want to use full disk paths in
your shell scripts.
** Affects: multipath-tools (Ubuntu)
Importance: Undecided
Status: New
** Tags: kpartx
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https://bugs.launchpad.net/bugs/1469143
Title:
kpartx -d fails with image paths longer than 63 characters
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[Bug 1469143] [NEW] kpartx -d fails with image paths longer than 63 characters
Public bug reported:
$ apt-show-versions multipath-tools
multipath-tools:amd64/vivid 0.4.9-3ubuntu12 uptodate
Reproduce:
Mount an image from a path longer than 63 chars succeeds:
$ sudo kpartx -av
asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12asdf13/disk.img
add map loop0p1 (252:0): 0 409600 linear /dev/loop0 2048
add map loop0p2 (252:1): 0 2 linear /dev/loop0 411648
add map loop0p5 : 0 819200 linear /dev/loop0 413696
add map loop0p6 : 0 819200 linear /dev/loop0 1234944
add map loop0p7 : 0 819200 linear /dev/loop0 2056192
add map loop0p8 : 0 1316864 linear /dev/loop0 2877440
but dismounting fails:
$ sudo kpartx -dv
asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12asdf13/disk.img
strace shows that the parameter on the dismount appears to get cut at 63 chars:
ioctl(3, DM_LIST_VERSIONS, 0x15b89b0) = 0
stat(asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12asdf13/disk.img,
{st_mode=S_IFREG|0644, st_size=2147483648, ...}) = 0
stat(/dev/loop0, {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0
open(/dev/loop0, O_RDONLY)= 4
ioctl(4, LOOP_GET_STATUS, {number=0, offset=0, flags=0,
name=asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12a, ...}) = 0
close(4)= 0
stat(/dev/loop1, {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 1), ...}) = 0
open(/dev/loop1, O_RDONLY)= 4
ioctl(4, LOOP_GET_STATUS, {number=0, offset=0, flags=0,
name=asfd1asdf2asdf3asdf4asdf5asdf6asfd7asdf8asdf9asf10asdf11asdf12a, ...}) =
-1 ENXIO (No such device or address)
if the path is 63 chars or less, the dismount also succeeds.
This is quickly becomes an issue if you want to use full disk paths in
your shell scripts.
** Affects: multipath-tools (Ubuntu)
Importance: Undecided
Status: New
** Tags: kpartx
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You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to multipath-tools in Ubuntu.
https://bugs.launchpad.net/bugs/1469143
Title:
kpartx -d fails with image paths longer than 63 characters
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1469143/+subscriptions
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