[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
For me it's the mtab entry for tracefs on a non-existing mount point in /var/lib/ureadahead/debugfs/tracing that is causing problems. It does affect VMware snapshots when quiescing is required too. Since it's a different entry then in this post I opened a new bug report in #1659684 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/499773/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
Installing linux-image-hwe-virtual-trusty on 14.04 with latest updates broke Veeam backups. This is a urgent issue, can somebody advice? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/499773/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
open-vm-tools also chokes on this, when freezing filesystems for a quiesced snapshot -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/499773/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
This bug does cause deja-dup to hang if you're backing up system files. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/499773/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
This is mainly for the benefit of people who search google for this problem and end up here. I've seen this on several servers. A simple umount /var/lib/ureadahead/debugfs removes the errant mtab entry and cleans up df output if it's bothering you. It's highly unlikely that this mount lying around is causing any actual problems. The only people who have reported disk full problems legitimately had full disks, and the performance degredation just doesn't make sense. It's entirely possible that there is some other coincident problem that is causing the performance problem that the above user reported. If you are having problems with a full disk issues but df is reporting you have free space, check the output from du. It's possible for a file to be deleted, but held open by a long-running process which prevents that space from being actually freed. This will make df report free space when there actually isn't any. To see if this might be affecting you, run lsof | grep deleted. If you see any files listed there, especially large ones, see if you can stop the process holding them open and that space will become usable again. It's likely you will see at least a few files in the list, probably log files, temp files, and lock files. Those are likely not worth worrying about. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/499773/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
It is not harmless. I am also getting file system full errors. For example, Mozilla Firefox, can't download anything since it can't store any temp files. $ df -h FilesystemSize Used Avail Use% Mounted on /dev/mapper/vg_local-root 19G 19G 0 100% / none 5.9G 280K 5.9G 1% /dev none 5.9G 1.3M 5.9G 1% /dev/shm none 5.9G 468K 5.9G 1% /var/run none 5.9G 0 5.9G 0% /var/lock none 5.9G 0 5.9G 0% /lib/init/rw none 19G 19G 0 100% /var/lib/ureadahead/debugfs /dev/sda1 457M 116M 317M 27% /boot /dev/mapper/vg_local-home 159G 47G 105G 31% /home -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/499773/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
@Håkan Jonsson (comment #20): But your root file system really is showing that it's full: $ df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_local-root 19G 19G 0 100% / Note the 100%, 19G out of 19G used. Have you proven that that's not true? (Pretty easy to fill up 19G these days...) -- T.J. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/499773/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
Help me out here, folks: Is this harmless or not? On the one hand, if it's just a matter of /etc/mtab claiming there's something mounted that isn't, that seems (relatively) harmless. On the other hand, we have at least one user reporting here (comment #9) that they see a significant performance impact when this happens, and multiple users reporting that it causes incorrect file system full errors (although I'm having trouble seeing why it would do that). So: * Does this really have a performance impact, or is that user mistaken? * Does this really cause false full errors, or are those users mistaken? 10.04 is an LTS release. I'm seeing this on my fully-updated 10.04 server, which surprises me nearly two years later if it really has any impacts. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/499773/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
Looks like doing dist-upgrade will fix it Processing triggers for ureadahead ... ureadahead will be reprofiled on next reboot Setting up linux-image-2.6.32-31-server (2.6.32-31.61) ... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
Is there a way to clean this up when it happens? E.g. a safe way to audit and fix /etc/mtab? ** Description changed: + When the system is booted, the mountall process may notice a + temporarily-mounted file system at /var/lib/ureadahead/debugfs and + record that fact in /etc/mtab. Later in the boot process, this file + system is unmounted, but mountall doesn't record unmounts, so it never + forgets this path when it's unmounted. + + Mountall should if necessary remove this mount from mtab. + + To confirm on your system that it is indeed not really mounted, look for it in /proc/self/mountinfo + Otherwise this may be due to a crash of the ureadahead process during boot. + + original report + Binary package hint: ureadahead $ mount /dev/sda1 on / type ext3 (rw,relatime,errors=remount-ro) proc on /proc type proc (rw) none on /sys type sysfs (rw,noexec,nosuid,nodev) none on /sys/fs/fuse/connections type fusectl (rw) none on /sys/kernel/debug type debugfs (rw) none on /sys/kernel/security type securityfs (rw) udev on /dev type tmpfs (rw,mode=0755) none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) none on /dev/shm type tmpfs (rw,nosuid,nodev) none on /var/run type tmpfs (rw,nosuid,mode=0755) none on /var/lock type tmpfs (rw,noexec,nosuid,nodev) none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755) none on /var/lib/ureadahead/debugfs type debugfs (rw) /dev/sda6 on /home type ext4 (rw,relatime) binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev) gvfs-fuse-daemon on /home/hildeb/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=hildeb) /var/lib/ureadahead/debugfs is left lingering around. It's use is somewhat limited, since most Ubuntu users are not kernel developers -- if it's used as intended: http://kerneltrap.org/node/4394 ProblemType: Bug Architecture: amd64 Date: Wed Dec 23 11:04:11 2009 DistroRelease: Ubuntu 9.10 NonfreeKernelModules: nvidia Package: ureadahead 0.90.3-2 ProcEnviron: - LANG=en_US.UTF-8 - SHELL=/bin/bash + LANG=en_US.UTF-8 + SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.31-17.54-generic SourcePackage: ureadahead Uname: Linux 2.6.31-17-generic x86_64 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
Getting this in fresh install of maverick 10.10, fully updated. $ df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/shim-root 230343852 107685244 110957772 50% / none 4034012 340 4033672 1% /dev none 4044064 47660 3996404 2% /dev/shm none 4044064 752 4043312 1% /var/run none 4044064 0 4044064 0% /var/lock none 230343852 107685244 110957772 50% /var/lib/ureadahead/debugfs /dev/sda1 233191 75352145398 35% /boot $ cat /proc/self/mountinfo 14 19 0:14 / /sys rw,nosuid,nodev,noexec,relatime - sysfs none rw 15 19 0:3 / /proc rw,nosuid,nodev,noexec,relatime - proc none rw 16 19 0:5 / /dev rw,relatime - devtmpfs none rw,size=4034012k,nr_inodes=1008503,mode=755 17 16 0:11 / /dev/pts rw,nosuid,noexec,relatime - devpts none rw,gid=5,mode=620,ptmxmode=000 18 14 0:15 / /sys/fs/fuse/connections rw,relatime - fusectl fusectl rw 19 1 252:1 / / rw,relatime - ext4 /dev/mapper/shim-root rw,errors=remount-ro,user_xattr,barrier=1,data=ordered 21 14 0:7 / /sys/kernel/debug rw,relatime - debugfs none rw 22 14 0:10 / /sys/kernel/security rw,relatime - securityfs none rw 23 16 0:16 / /dev/shm rw,nosuid,nodev,relatime - tmpfs none rw 24 19 0:17 / /var/run rw,nosuid,relatime - tmpfs none rw,mode=755 25 19 0:18 / /var/lock rw,nosuid,nodev,noexec,relatime - tmpfs none rw 26 19 8:1 / /boot rw,relatime - ext2 /dev/sda1 rw,errors=continue 27 15 0:19 / /proc/sys/fs/binfmt_misc rw,nosuid,nodev,noexec,relatime - binfmt_misc binfmt_misc rw 20 19 0:20 / /home/aaron/.gvfs rw,nosuid,nodev,relatime - fuse.gvfs-fuse-daemon gvfs-fuse-daemon rw,user_id=1000,group_id=1000 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
Mine disappeared after a server re-boot (on fully patched 10.04 system) - but will it re-appear? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
It's still happening in natty: $ df -h FilesystemSize Used Avail Use% Mounted on /dev/sda1 106G 62G 39G 62% / none 2,0G 296K 2,0G 1% /dev none 2,0G 5,2M 2,0G 1% /dev/shm none 2,0G 128K 2,0G 1% /var/run none 2,0G 0 2,0G 0% /var/lock none 106G 62G 39G 62% /var/lib/ureadahead/debugfs $ ps auxwww|grep ureadahead hildeb 26013 0.0 0.0 10396 924 pts/1S+ 15:18 0:00 grep ureadahead $ cat /proc/mounts rootfs / rootfs rw 0 0 none /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 none /proc proc rw,nosuid,nodev,noexec,relatime 0 0 none /dev devtmpfs rw,relatime,size=2016252k,nr_inodes=504063,mode=755 0 0 none /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0 /dev/disk/by-uuid/d3877693-43c0-45cc-821c-6c4dcd692cde / ext4 rw,noatime,errors=remount-ro,barrier=1,data=ordered 0 0 none /sys/kernel/debug debugfs rw,relatime 0 0 none /sys/kernel/security securityfs rw,relatime 0 0 none /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0 none /var/run tmpfs rw,nosuid,relatime,mode=755 0 0 none /var/lock tmpfs rw,nosuid,nodev,noexec,relatime 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,nosuid,nodev,noexec,relatime 0 0 gvfs-fuse-daemon /home/hildeb/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/499773 Title: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
Why has this been set to importance: low when tens of thousands of users are told their hard disks are full, and they can no longer store files on them? -- Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab https://bugs.launchpad.net/bugs/499773 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 499773] Re: Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab
** Changed in: mountall (Ubuntu) Importance: Medium = Low -- Race with ureadahead can mean that /var/lib/ureadahead/debugfs appears in /etc/mtab https://bugs.launchpad.net/bugs/499773 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
