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Subject: bug#79096: du: -x doesn't detect sshfs file system
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My du is:

 $ du --version
 du (GNU coreutils) 8.30
 Copyright (C) 2018 Free Software Foundation, Inc.
 License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.

 Written by Torbjorn Granlund, David MacKenzie, Paul Eggert,
 and Jim Meyering.
 $

Admittedly, this is pretty old.  If the bug I am about to describe is already fixed,
please let me know.

I used the following command to check disk usage in ~:

 $ du -sxc ~/*

Unfortunately, this hung when it hit the directory ~/sshfs_mount, which is sshfs
mounted to my home dir on some other system.

To get it to do the right thing, I had to add: '--exclude=sshfs*'
to the command line.

Shouldn't -x have prevented it from descending into the sshfs_mount directory?

Note that I use -x on lots of other commands (e.g., find), since I usually don't want
it to waste time searching other systems (which is slow).  I've never had a problem
with it before (this is the first time I've used it with "du").

Note that I have not tested du/-x on any other type of mounted filesystem.  I don't
know if the problem is limited to sshfs mounts.  But it seems likely, since sshfs is
kind of obscure and not widely used.

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Subject: bug#79096: Acknowledgement (du: -x doesn't detect sshfs file system)
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Subject: bug#79096: du: -x doesn't detect sshfs file system
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Thanks for reporting it. Can you use 'strace' to find out which system 
call is hanging? That would help isolate whether the bug is in 'du' or 
is in the kernel.

At some point we might ask whether you can reproduce the bug with the 
latest stable Coreutils 
<https://ftp.gnu.org/gnu/coreutils/coreutils-9.7.tar.xz> but the 
'strace' is an easy thing to check first.

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Subject: bug#79096: du: -x doesn't detect sshfs file system
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On Fri, Jul 25, 2025, 12:02 Stan Marsh <gazelle@HIDDEN> wrote:

>
> I used the following command to check disk usage in ~:
>
>  $ du -sxc ~/*
>
> Unfortunately, this hung when it hit the directory ~/sshfs_mount, which is
> sshfs
> mounted to my home dir on some other system.
>

When the glob is expanded, $HOME/sshfs_mount ends up being one of the args
to `du' so it seems not surprising that the directory is processed.

>

--0000000000007dc96e063ac402b1
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<div dir=3D"auto"><div><div class=3D"gmail_quote gmail_quote_container"><di=
v dir=3D"ltr" class=3D"gmail_attr">On Fri, Jul 25, 2025, 12:02 Stan Marsh &=
lt;<a href=3D"mailto:gazelle@HIDDEN">gazelle@HIDDEN</a>&gt; wro=
te:</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;borde=
r-left:1px #ccc solid;padding-left:1ex">
<br>
I used the following command to check disk usage in ~:<br>
<br>
=C2=A0$ du -sxc ~/*<br>
<br>
Unfortunately, this hung when it hit the directory ~/sshfs_mount, which is =
sshfs<br>
mounted to my home dir on some other system.<br></blockquote></div></div><d=
iv dir=3D"auto"><br></div><div dir=3D"auto">When the glob is expanded, $HOM=
E/sshfs_mount ends up being one of the args to `du&#39; so it seems not sur=
prising that the directory is processed.</div><div dir=3D"auto"><div class=
=3D"gmail_quote gmail_quote_container"><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
</blockquote></div></div></div>

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> Thanks for reporting it. Can you use 'strace' to find out which system call is
> hanging? That would help isolate whether the bug is in 'du' or is in the kernel.

It may have been imprecise of me to say it "hung" - in the sense of hanging on a
single system call or operation.  Rather, it stopped generating output when it hit
that directory - presumably because it was spending mass amounts of time examining the
files and directories under the sshfs_mount directory.

When I ran: strace du -sx ~/sshfs_mount
it generated tons of output (until I Ctrl/C'd it) and seemed to be "fstat"ing files on
the remote system that do not exist.  For example:

--- Cut Here ---
openat(4, "..", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW|O_CLOEXEC|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|0700, st_size=13, ...}) = 0
close(4)                                = 0
fstatat64(3, "groff_1.23.0-3build2_amd64.deb", {st_mode=S_IFREG|0644, st_size=11721486, ...}, AT_SYMLINK_NOFOLLOW) = 0
fstatat64(3, "etc", {st_mode=S_IFDIR|0755, st_size=3, ...}, AT_SYMLINK_NOFOLLOW) = 0
--- Cut Here ---

I can assure you that the groff "deb" file does not exist - either on the local system
or the remote one (the one sshfs is connected to) (*).  In fact, these are all ARM
systems, so no idea where the amd64 "deb" file is coming from.

(*) Not only that, but sshfs should not be giving it access to anywhere on the remote
system that is outside of my $HOME, yet it was "fstat"ing files from the system
directories (including "app-defaults", which is under /etc/X11).

> At some point we might ask whether you can reproduce the bug with the latest stable
> Coreutils <https://ftp.gnu.org/gnu/coreutils/coreutils-9.7.tar.xz> but the 'strace'
> is an easy thing to check first.

No problem.  I will probably get and build the latest du at some point and test that.

By the way, and just out of curiosity, what method does "du" use to figure out if
something is a mountpoint (and thus to be skipped if -x was supplied on the cmd line) ?

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Hi Stan,

Haven't gotten a chance to read through the original report yet, but...

Stan Marsh <gazelle@HIDDEN> writes:

> By the way, and just out of curiosity, what method does "du" use to figure out if
> something is a mountpoint (and thus to be skipped if -x was supplied on the cmd line) ?

We have a function in Gnulib to get a list of mount points. In the
gnulib repository see mountlist.{h,c} [1] [2]. That is what 'du' uses.

Collin

[1] https://gitweb.git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=lib/mountlist.h;h=dcff6f831939a3b991abf63e3b4797ff72640a50;hb=HEAD
[2] https://gitweb.git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=lib/mountlist.c;h=dcff6f831939a3b991abf63e3b4797ff72640a50;hb=HEAD

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> When the glob is expanded, $HOME/sshfs_mount ends up being one of the args
> to `du' so it seems not surprising that the directory is processed.

Yeah, you're probably right, now that I think about it.

With "du", I prefer using ~/* instead of just ~ because then you get totals for each
(top-level) directory instead of just one grand total.  And you get output as you go,
not just at the very end (after a long wait/delay).

Also, using ~/* skips things like ~/.gvfs - a directory which is often problematic.

Nevertheless, it could be argued that -x should cause it to skip (i.e., not descend
into) any directory which is a mountpoint (as verified/shown by the "mountpoint"
command).  Maybe a distinction could be made between:
    sshfs_mount
and
    sshfs_mount/

I.e., some utilities (e.g., rsync) make that distinction - where the trailing / tells
it to treat it as a destination rather than as a directory per se (*).  I would argue
that without the trailing /, it should not recurse it if it is a mountpoint and -x was
supplied.

Anyway, the workaround using --exclude works fine, so I'm not too bothered by this now.

(*) I was never very clear on this in rsync and it always drove me crazy - I'd always
get it wrong and end up with an extra directory when I didn't want it or the stuff
copied to the current directory when I did want the extra level of directory - until I
finally figured out what the two syntaxes mean.

=================================================================================
Please do not send me replies to my posts on the list.
I always read the replies via the web archive, so CC'ing to me is unnecessary.

Note that they always end up in my Spam file anyway, so it is annoying to have to
periodically clean that out.

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On 2025-07-25 11:25, Stan Marsh wrote:
> it could be argued that -x should cause it to skip (i.e., not descend
> into) any directory which is a mountpoint

That goes too far; people regularly use commands like 'du -x 
/mountpoint' to list just that file system.

It sounds like we have a feature request here for a new option, which 
would behave the way you like. So I have marked the bug report as a 
wishlist item. Not sure whether it's worth implementing....

Last modified: Fri, 25 Jul 2025 20:00:02 UTC

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