This bug was fixed in the package systemd - 218-2ubuntu3
---------------
systemd (218-2ubuntu3) vivid; urgency=medium
* core-Put-session-scopes-into-all-cgroup-controllers.patch: Revert upstream
commit 02ba8fb3357d to fix eternal kernel deep sleep hangs when unmounting
an ntfs-3g partition. (LP: #1398859)
-- Martin Pitt <martin.p...@ubuntu.com> Thu, 18 Dec 2014 13:32:49 +0100
** Changed in: systemd (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1398859
Title:
unmounting NTFS causes mount.ntfs process to get stuck in eternal
kernel deep sleep
Status in systemd package in Ubuntu:
Fix Released
Bug description:
Since Mid-November the udisks2 test (https://jenkins.qa.ubuntu.com/job
/vivid-adt-udisks2/? shows it happened between Nov 13 and 19) exhibits
a regression with NTFS: Unmounting causes the ntfs-3g process to go
into kernel deep sleep and umount hangs forever.
This can be reproduced with
sudo apt install ntfs-3g
sudo modprobe scsi_debug
# check dmesg which drive this created; e. g. /dev/sda
sudo mkntfs -F /dev/sda
sudo mount /dev/sda /mnt
Now you have a process which is happy:
root 12821 0.0 0.0 15272 1948 ? Ss 15:49 0:00
/sbin/mount.ntfs /dev/sda /mnt -o rw
You can work with /mnt, edit files, etc. But now unmount:
sudo umount /mnt
This never returns, and the process goes into uninterruptible kernel
sleep ("D"):
root 12928 0.0 0.0 15272 1948 ? Ds 15:55 0:00
/sbin/mount.ntfs /dev/sda /mnt -o rw
The strace for the umount until the hang is
ubuntu@autopkgtest:~$ sudo strace -vvtts1024 -p 12928
Process 12928 attached
15:56:17.938299 read(4,
"0\0\0\0\2\0\0\0\2\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0",
135168) = 48
15:56:22.338931 read(4,
"(\0\0\0&\0\0\0\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
135168) = 40
15:56:22.339637 sendto(5, "<29>Dec 3 15:56:22 ntfs-3g[12928]: Unmounting
/dev/sda ()\n", 59, MSG_NOSIGNAL, NULL, 0) = 59
15:56:22.340509 fsync(3) = 0
15:56:22.341188 fcntl(3, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0,
len=0}) = 0
15:56:22.341759 close(3
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ntfs-3g 1:2013.1.13AR.1-2ubuntu3
ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
Uname: Linux 3.16.0-25-generic x86_64
ApportVersion: 2.15-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Dec 3 15:48:12 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-11-20 (13 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141119)
SourcePackage: ntfs-3g
UpgradeStatus: No upgrade log present (probably fresh install)
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