Package: coreutils;
Reported by: Dave <dave <at> momentumweb.com>
Date: Fri, 18 Dec 2015 00:29:02 UTC
Severity: normal
Tags: notabug
Done: Assaf Gordon <assafgordon <at> gmail.com>
Bug is archived. No further changes may be made.
Message #17 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Dave <dave <at> momentumweb.com> To: bug-coreutils <at> gnu.org Subject: Re: bug#22199: Bug in coreutils for Linux Mint?? Package coreutils_8.21-1ubuntu5.3_amd64 Date: Wed, 23 Dec 2015 13:42:42 -0600
On 12/21/2015 7:39 PM, Pádraig Brady wrote: > On 21/12/15 22:13, Dave wrote: >> On 12/18/2015 4:28 AM, Pádraig Brady wrote: >>> On 18/12/15 00:23, Dave wrote: >>>> df's output shows this on a standard run(df with no flags): >>>> >>>> Filesystem 1K-blocks Used Available Use% Mounted on >>>> udev 1953632 4 1953628 1% /dev >>>> tmpfs 400436 1216 399220 1% /run >>>> /dev/sda1 957218452 302330152 606241340 34% / >>>> none 4 0 4 0% /sys/fs/cgroup >>>> none 5120 0 5120 0% /run/lock >>>> none 2002168 8 2002160 1% /run/shm >>>> none 102400 4 102396 1% /run/user >>>> /dev/sdb1 957218452 302510240 606061252 34% /mnt/bkup/device2 >>>> >>>> But when I mount an external USB disk that's on /dev/sdc1, df shows this >>>> output: >>>> >>>> Filesystem 1K-blocks Used Available Use% Mounted on >>>> udev 1953632 4 1953628 1% /dev >>>> tmpfs 400436 1272 399164 1% /run >>>> /dev/sdc1 957218452 302334136 606237356 34% / >>>> none 4 0 4 0% /sys/fs/cgroup >>>> none 5120 0 5120 0% /run/lock >>>> none 2002168 8 2002160 1% /run/shm >>>> none 102400 4 102396 1% /run/user >>>> /dev/sdb1 957218452 302498156 606073336 34% /mnt/bkup/device2 >>>> /dev/sdc1 957218452 302564064 606007428 34% /mnt/bkup/externaldevice >>>> >>>> The filesystem of "/" has mysteriously changed (in appearance) to >>>> /dev/sdc1?! All I did was mount the /dev/sdc1 device. In fact, >>>> /dev/sdc1 is ONLY mounted at /mnt/bkup/externaldevice, and the mounted >>>> filesystem on "/" is still /dev/sda1. I tested by writing a couple of >>>> files, plus mount shows the correct info: >>>> >>>> /dev/sda1 on / type ext4 (rw,errors=remount-ro) >>>> /dev/sdb1 on /mnt/bkup/device2 type ext4 (rw) >>>> >>>> If I unmount /mnt/bkup/externaldevice, df still shows /dev/sdc1 as the >>>> "/" filesystem for a small amount of time (10-20 seconds) and then it >>>> goes back to the correct filesystem of /dev/sda1. >>>> >>>> What is going on?? This only happened after upgrading to the package of >>>> coreutils mentioned in the subject, it was not doing this previously. >>>> Also, to note, the first two lines of the df output regarding udev and >>>> tmpfs did not appear until this version either. I did see in the >>>> changelog that df was updated to display some additional information, so >>>> perhaps it has to do with that?? >>> I see that ubuntu has backported _some_ patches from master. >>> Perhaps they were incomplete. Could you please try out this latest df binary. >>> >>> wget http://www.pixelbeat.org/cu/df >>> chmod a+x df >>> ./df >>> >>> (There is a df.sig file is the same dir for gpg verification >>> using the public key associated with this email address if desired) >>> >>> cheers, >>> Pádraig. >>> >> Pádraig, thanks for the response. The df you provided (v8.24.113-84fcb) >> also shows /dev/sdc1 in place of /dev/sda1 once the /dev/sdc1 device is >> mounted, the same as in the example in the correspondence above. Is that >> what you were expecting? >> >> I found a copy of the old df that was in use before the coreutils >> package upgrade, and it presents as version 8.21 just like the current >> one when running df --version. The package the original came from was >> coreutils_8.21-1ubuntu5.1_amd64 and the df executable is dated Jan 13, >> 2015. I just ran THAT df, and here's the output (with the /dev/sdc1 >> device mounted): >> >> Filesystem 1K-blocks Used Available Use% Mounted on >> /dev/sda1 957218452 304082900 604488592 34% / >> none 4 0 4 0% /sys/fs/cgroup >> udev 1953632 4 1953628 1% /dev >> tmpfs 400436 1272 399164 1% /run >> none 5120 0 5120 0% /run/lock >> none 2002168 8 2002160 1% /run/shm >> none 102400 4 102396 1% /run/user >> /dev/sdb1 957218452 304106588 604464904 34% /mnt/bkup/device2 >> /dev/sdc1 957218452 300703220 607868272 34% /mnt/bkup/externaldevice >> >> So, 2 things of note: 1) I was clearly incorrect in saying in my >> original message that the udev and tmpfs lines weren't showing in the >> original df listing, because there they are, they were just in a >> different spot (ie, not at the top) as you can see above. Apologies for >> the misinformation on that. 2) Well, you can see that the old df is >> reporting the root filesystem as /dev/sda1 correctly. If I run your df, >> or the newer df, both incorrectly show "/dev/sdc1" for the root >> filesystem after /dev/sdc1 is mounted at /mnt/bkup/externaldevice. >> >> Also, here are the relevant lines from /proc/mounts and >> /proc/self/mountinfo you had requested: >> >> /proc/mounts: >> rootfs / rootfs rw 0 0 >> /dev/sdb1 /mnt/bkup/device2 ext4 rw,relatime,data=ordered 0 0 >> /dev/sdc1 /mnt/bkup/externaldevice ext4 rw,relatime,data=ordered 0 0 >> >> /proc/self/mountinfo: >> 22 1 8:1 / / rw,relatime - ext4 >> /dev/disk/by-uuid/ced6112c-e347-4ac4-a160-0b2f03c88602 >> rw,errors=remount-ro,data=ordered >> 23 22 8:17 / /mnt/bkup/device2 rw,relatime - ext4 /dev/sdb1 rw,data=ordered >> 33 22 8:33 / /mnt/bkup/externaldevice rw,relatime - ext4 /dev/sdc1 >> rw,data=ordered >> >> Also, it should be noted, upon looking further into the uuid for "/" >> referenced in /proc/self/mountinfo, I found that that reference is >> softlinked to "/dev/sdc1" and it stays that way even after the external >> device is unmounted. Hmm. So /proc/self/mountinfo seems wrong about "/" >> in this case, since it's not referencing /dev/sda in any way. And it's >> odd that the older df works, even despite that issue. Maybe I'm not >> clear on what all /proc/self/mountinfo is supposed to convey? And maybe >> this bug is originating somewhere else outside of df then? > Neither /proc/self/mounts or /proc/self/mountinfo mention /dev/sda1 ? > That's weird. Note the older ubuntu df should be referencing /etc/mtab > which these days is usually a link to /proc/self/mounts. > The newer df will directly reference /proc/self/mountinfo. > > So it would be good to confirm that /etc/mtab is a symlink to /proc/self/mounts. > Also it would be good to attach that file and /proc/self/mountinfo > to avoid any ambiguity. > > thanks, > Pádraig > Can't get those files attached at the moment, but I can confirm that /etc/mtab is NOT a symlink to anything and is in fact its own file. And this non-symlink /etc/mtab does reference /dev/sda1. FWIW. -Dave
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