GNU Hurd/ open issues/ cannot create dev null interrupted system call

Welcome to... ... the GNU Hurd!

/!\ I think this has been resolved?

  1. IRC, freenode, #hurd, 2013-12-05
    1. IRC, freenode, #hurd, 2013-12-19
    2. IRC, freenode, #hurd, 2013-12-20
    3. IRC, freenode, #hurd, 2014-01-26
    4. IRC, freenode, #hurd, 2014-01-27
    5. IRC, freenode, #hurd, 2014-01-28
    6. IRC, freenode, #hurd, 2014-01-29
    7. IRC, OFTC, #debian-hurd, 2014-02-02
    8. IRC, freenode, #hurd, 2014-02-05
    9. IRC, freenode, #hurd, 2014-02-11
    10. IRC, OFTC, #debian-hurd, 2014-02-16
    11. IRC, freenode, #hurd, 2014-02-17
    12. IRC, freenode, #hurd, 2014-02-23
    13. tschwinge's notes, 2014-02-24
    14. tschwinge's notes, 2014-04-09
      1. ps -AF hurd-long

IRC, freenode, #hurd, 2013-12-05

<teythoon> Creating device nodes: fd fdX std vcs hdX hdXsY hdXs1Y sdX sdXsY
  sdXs1Y cdX netdde ethX loopX ttyX ptyp ptyq/sbin/MAKEDEV: 75:
  /sbin/MAKEDEV: cannot create /dev/null: Interrupted system call
<teythoon> that's new
<braunr> teythoon: ouch
<teythoon> braunr: everything works fine though
<braunr> teythoon: that part isn't too surprising
<teythoon> y?
<braunr> teythoon: /dev/null already existed, didn't it ?
<teythoon> braunr: sure, yes

IRC, freenode, #hurd, 2013-12-19

<braunr> hm
<braunr> i'm seeing those /sbin/MAKEDEV: cannot create /dev/null:
  Interrupted system call messages too

IRC, freenode, #hurd, 2013-12-20

<teythoon> braunr: interesting, I've seen some of those as well

IRC, freenode, #hurd, 2014-01-26

<gg0> cannot create /dev/null: Interrupted system call
<gg0>
  http://gnashdev.org:8010/builders/z-sid-hurd-i386/builds/26/steps/system_upgrade/logs/stdio

IRC, freenode, #hurd, 2014-01-27

<anatoly> gg0: I had same /dev/null error after upgrading my old image
  (more than 6 months old) a week ago. But I got such message only on boot
  and it didn't autostart hurd console.
<anatoly> Tried to upgrade current qemu image (from topic) to reproduce it
  but it works OK after upgrade
<gg0> i can reproduce it with # apt-get install --reinstall python2.7 dbus
  # for instance
<gg0> http://paste.debian.net/plain/78566/
<teythoon> gg0: i've seen those as well, but i cannot reliably reproduce it
  to track it down
<teythoon> i believe it's benign though
<gg0> in shell scripts if -e is set, it aborts on failures like those
<teythoon> uh, it does? :/
<gg0> so if this happens in prerm/postinst scripts, package is not properly
  installed/removed/configured and it fails
<gg0> redirecting stdout and strerr to /dev/null shouldn't be so
  problematic, anything wrong in my setup?
<gg0> can you reproduce it?
<teythoon> not reliably
<teythoon> gg0: but i do not believe that anything is wrong with your
  machine
<gg0> any way to debug it?
<teythoon> having a minimal test case that triggers this reliably would be
  great
<teythoon> but i fear it might be a race

IRC, freenode, #hurd, 2014-01-28

<teythoon> have you seen the /dev/null issue ?
<braunr> yes
<teythoon> what do you make of it ?
<braunr> no idea
<teythoon> i believe it is related to the inlining work i've done
<braunr> just like the bogus deallocation at boot, it needs debugging :)
<braunr> hm i don't think so
<teythoon> no ?
<braunr> i think we saw it even before your started working on the hurd ;p
<teythoon> i've never seen it before my recent patches
<teythoon> maybe i made it worse
<braunr> not worse, just exposed more
<teythoon> right

IRC, freenode, #hurd, 2014-01-29

<gg0> cannot reproduce "cannot create /dev/null: Interrupted system call"
  on a faster VM
<gg0> might depend on that?

IRC, OFTC, #debian-hurd, 2014-02-02

<pere> but now saw a strange message at the end of the boot:
  /etc/init.dhurd-console: 55: /etc/init.d/hurd-console: cannot create
  /dev/null: Interrupted system call
<gg0> oh well known on a slow VM (even old qemu/kvm btw), i can't reproduce
  it on a faster/more recent one
<gg0> slow VM = gnash buildbot slave
  http://gnashdev.org:8010/builders/z-sid-hurd-i386/builds/26/steps/system_upgrade/logs/stdio
<gg0> especially bad on system upgrade because it doesn't finish to run
  prerm/postinst scripts :/

IRC, freenode, #hurd, 2014-02-05

<gg0> Creating device nodes: fd fdX std vcs hdX hdXsY/sbin/MAKEDEV: 75:
  /sbin/MAKEDEV: cannot create /dev/null: Interrupted system call hdXs1Y
  sdX sdXsY sdXs1Y cdX netdde ethX loopX ttyX ptyp ptyq lprX comX random
  urandom kbd mouse shm.

IRC, freenode, #hurd, 2014-02-11

<gg0> typical dist-upgrade http://paste.debian.net/plain/81346/
<gg0> many fewer cannot create /dev/null: Interrupted system call
<gg0> on a faster machine
<teythoon> gg0: wow, so many interrupted system call messages
<teythoon> i don't get as many, but makedev produces a few every time i run
  it as well

IRC, OFTC, #debian-hurd, 2014-02-16

<pere> anyone here got any idea why upgrading initscripts fail on the hurd
  gnash autobuilder, as reported on <URL:
  http://gnashdev.org:8010/builders/z-sid-hurd-i386/builds/28/steps/system_upgrade/logs/stdio
  >?
<gg0> pere: cannot create /dev/null: Interrupted system call
<pere> gg0: I noticed the message, but fail to understand how this could
  happen.
<gg0> 13:16 < gg0> oh well known on a slow VM (even old qemu/kvm btw), i
  can't reproduce it on a faster/more recent one
<gg0> 13:17 < gg0> slow VM = gnash buildbot slave
  http://gnashdev.org:8010/builders/z-sid-hurd-i386/builds/26/steps/system_upgrade/logs/stdio
<gg0> 13:18 < gg0> especially bad on system upgrade because it doesn't
  finish to run prerm/postinst scripts :/
<gg0> i remember teythoon talking about something racy
<teythoon> gg0: the /dev/null issue is known for a long time
<teythoon> gg0: some of the recent work (i believe mine) has made the
  problem more apparent
<teythoon> gg0: that's what braunr told me
<gg0> i see. it would be really nice fixing it. really annoying. i
  workaround it by moving null away and moving it back under /dev before
  halting/rebooting

IRC, freenode, #hurd, 2014-02-17

<tschwinge> Earlier today, I upgraded my Debian GNU/Hurd installation from
  several months ago, and I'm now seeing bogus things as follows; is that a
  known issue?
<tschwinge>  checking for i686-unknown-gnu0.5-ar... ar
<tschwinge>  configure: updating cache ./config.cache
<tschwinge>  configure: creating ./config.status
<tschwinge> +./config.status: 299: ./config.status: cannot create
  /dev/null: Interrupted system call
<tschwinge>  config.status: creating Makefile
<tschwinge> (The plus is from a build log diff.)
<azeem> 13:36 < gg0> pere: cannot create /dev/null: Interrupted system call
<azeem> 20:10 < teythoon> gg0: the /dev/null issue is known for a long time
<tschwinge> Anyone working on resolving this?  I't causing build issues:
<tschwinge> checking for i686-unknown-gnu0.5-ranlib... (cached) ranlib
<tschwinge> checking command to parse nm output from gcc-4.8
  object... [...]/opcodes/configure: 6760: ./configure.lineno: cannot
  create /dev/null: Interrupted system call
<tschwinge> failed
<tschwinge> checking for dlfcn.h... yes
<tschwinge> Anyway, will go researching IRC logs.
<azeem> tschwinge: (that one was from #debian-hurd)
<azeem> I assume teythoon and/or braunr can comment once he's back
<azeem> they're*
<braunr> tschwinge: we've been seing this more often lately but noone has
  attempted to fix it yet
<braunr> tschwinge: if you have a reliable way to reproduce that /dev/null:
  Interrupted system call error, please let us know

IRC, freenode, #hurd, 2014-02-23

<gg0> braunr: cool. i'd vote /dev/null one as next one in your todo
<gg0> still frequent on this slow vm
  http://gnashdev.org:8010/builders/z-sid-hurd-i386/builds/30/steps/system_upgrade/logs/stdio
<gg0> especially during setup-translators -k
<braunr> yes

tschwinge's notes, 2014-02-24

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && dash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/dash CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done

Does happen, but log not useful.

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && dash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done

Running fine 2066 times, then I terminated.

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && dash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/dash\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done
[...]
9
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

+ ln -s conf29005.file conf29005.dir
+ test ! -f conf29005.exe
+ rm -f conf29005 conf29005.exe conf29005.dir/conf29005.file conf29005.file
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call
+ rmdir conf29005.dir
+ mkdir -p .

$ cat -n < config.status | sed -n '294,+10 p'
   294    fi
   295  else
   296    as_ln_s='cp -p'
   297  fi
   298  rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
   299  rmdir conf$$.dir 2>/dev/null
   300  
   301  
   302  # as_fn_mkdir_p
   303  # -------------
   304  # Create "$as_dir" as a directory, including parents if necessary.

But conf29005.dir now still exists, empty.

$ rmdir conf29005.dir 2> /dev/null
$ echo $?

What this configure invocation is doing differently from the previous one is that it re-execs the configure script (due to, and with SHELL=[...]).

/bin/sh currently is a symlink to bash.

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && bash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/bash\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done

Running fine 60 times, then I terminated.

$ sudo ln -sf dash /bin/sh

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && dash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done

Running fine 50 times, then I terminated.

+ CONFIG_SHELL=/bin/bash as_have_required=yes
[...]
+ exec /bin/bash ../W._C._Handy/configure --prefix=/home/thomas/tmp/binutils-gdb/tschwinge/W._C._Handy.build.install --enable-gold --with-sysroot=/ CC=gcc-4.8 CXX=g++-4.8 --disable-werror

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && bash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/bash\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done

Running fine 85 times, then I terminated.

No exec.

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && bash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/sh\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done
[...]
18
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

No exec. -> Assuming exec of /bin/*sh is not relevant.

Back to normal:

$ sudo ln -sf bash /bin/sh

Maybe it's a dash issue (or, an issue triggered by dash)?

/usr/share/doc/dash/changelog.Debian.gz

dash (0.5.7-4) unstable; urgency=low

  * Thx Michael Gilbert for NMU.
    * 0006-JOBS-address-format-security-build-error.diff: new: address
      format-security build error (patch from Simon Ruderich).
  * debian/rules: make DEB_BUILD_OPTIONS=diet build working again.
  * debian/diff/0007-EVAL-Report-I-O-error-on-stdout.diff: new: eval: report
    I/O error on stdout (closes: #690473).

 -- Gerrit Pape <pape@smarden.org>  Wed, 08 Jan 2014 11:54:11 +0000

dash (0.5.7-3+nmu1) unstable; urgency=medium

  * Non-maintainer upload.
  * Enable build-hardening flags (closes: #662721).

 -- Michael Gilbert <mgilbert@debian.org>  Wed, 25 Dec 2013 13:46:03 -0500

dash (0.5.7-3) unstable; urgency=low
  [...]
 -- Gerrit Pape <pape@smarden.org>  Thu, 01 Mar 2012 00:09:45 +0000

From its name alone, »0007-EVAL-Report-I-O-error-on-stdout.diff: new: eval: report I/O error on stdout (closes: #690473)« sounds suspicious.

diff --git a/src/eval.c b/src/eval.c
index 7252463..863aa77 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -899,6 +899,8 @@ evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags)
       else
               status = (*cmd->builtin)(argc, argv);
       flushall();
+      if (outerr(out1))
+              warnx("%s: I/O error", commandname);
       status |= outerr(out1);
       exitstatus = status;
 cmddone:

./output.h:extern struct output *out1;
./output.h:#define outerr(f)    (f)->flags

That doesn't really look too suspicious, but let's try without this patch:

$ apt-get source dash
$ cd dash-0.5.7/
$ mv debian/diff/0007-Report-I-O-error-on-stdout.diff{,_}
$ dpkg-buildpackage -uc -b
$ sudo dpkg -i ../dash_0.5.7-4_hurd-i386.deb

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && bash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/dash\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done
[...]
2
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

So that dash change is not relevant.

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && dash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/dash\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done
[...]
185
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

Wow, so it can take a little while...

Before noticing this problem, I had been running dash 0.5.7-3+nmu1; re-get that from http://snapshot.debian.org/binary/dash/.

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && dash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/dash\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done
[...]
178
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && bash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/dash\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done
[...]
27
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

[...]
5
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

[...]
3
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

[...]
16
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

[...]
70
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

[...]
2
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

[...]
3
./config.status: 299: ./config.status: cannot create /dev/null: Interrupted system call

It appears that generally the issue appearch faster when running »bash configure SHELL=/bin/dash« as opposed to »dash configure SHELL=/bin/dash«.

To re-confirm that dash needs to be involved:

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && bash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/bash\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done

The next morning:

bash: l: Computer bought the farm
rm: cannot remove `./*': Computer bought the farm
bash: l: Computer bought the farm
rm: cannot remove `./*': Computer bought the farm
[...]
$ fsysopts .
fsysopts: .: Computer bought the farm
$ cd
$ fsysopts .
/hurd/ext2fs --readonly --no-atime --no-inherit-dir-group /dev/hd2s2

Console: ?ext2fs libports reference counting assertion.mdwn. Reboot.

Again:

$ i=0; while ! grep Inter < l; do rm -vrf ./* && echo $((++i)) && bash -x ../W._C._Handy/configure --prefix="$PWD".install --enable-gold --with-sysroot=/ SHELL=/bin/bash\ -x CC=gcc-4.8 CXX=g++-4.8 --disable-werror > l 2>&1; done

Running fine 18054 times, then I terminated.

Then, message-id "87wqghouoc.fsf@schwinge.name" desc="coulomb died"...

tschwinge's notes, 2014-04-09

Now running in a QEMU/KVM virtual machine. The issue is much harder to reproduce.

Reinstalling Debian's hurd package, it is observed fairly regularely, always when setting up the translators, but in different positions:

$ sudo apt-get --reinstall install hurd
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.
Need to get 0 B/1377 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 70001 files and directories currently installed.)
Preparing to unpack .../hurd_1%3a0.5.git20140326-1_hurd-i386.deb ...
Unpacking hurd (1:0.5.git20140326-1) over (1:0.5.git20140326-1) ...
Setting up hurd (1:0.5.git20140326-1) ...
Setting up translators: /hurd/exec /hurd/proxy-defpager /hurd/pflocal (+link) /hurd/pfinet (+link) (+link) /hurd/procfs -c /hurd/password crash-kill crash-suspend crash-dump-core crash.
Creating device nodes: fd fdX std vcs hdX hdXsY hdXs1Y sdX sdXsY/sbin/MAKEDEV: 75: /sbin/MAKEDEV: cannot create /dev/null: Interrupted system call
 sdXs1Y cdX netdde ethX loopX ttyX ptyp ptyq lprX comX random urandom kbd mouse shm.
[...]
$ sudo apt-get --reinstall install hurd
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.
Need to get 0 B/1377 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 70001 files and directories currently installed.)
Preparing to unpack .../hurd_1%3a0.5.git20140326-1_hurd-i386.deb ...
Unpacking hurd (1:0.5.git20140326-1) over (1:0.5.git20140326-1) ...
Setting up hurd (1:0.5.git20140326-1) ...
Setting up translators: /hurd/exec /hurd/proxy-defpager /hurd/pflocal (+link) /hurd/pfinet (+link) (+link) /hurd/procfs -c /hurd/password crash-kill crash-suspend crash-dump-core crash.
Creating device nodes: fd fdX std vcs hdX hdXsY hdXs1Y sdX sdXsY sdXs1Y cdX netdde ethX loopX ttyX ptyp/sbin/MAKEDEV: 75: /sbin/MAKEDEV: cannot create /dev/null: Interrupted system call
 ptyq lprX comX random urandom kbd mouse shm.
[...]
$ sudo apt-get --reinstall install hurd
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.
Need to get 0 B/1377 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 70001 files and directories currently installed.)
Preparing to unpack .../hurd_1%3a0.5.git20140326-1_hurd-i386.deb ...
Unpacking hurd (1:0.5.git20140326-1) over (1:0.5.git20140326-1) ...
Setting up hurd (1:0.5.git20140326-1) ...
Setting up translators: /hurd/exec /hurd/proxy-defpager /hurd/pflocal (+link) /hurd/pfinet (+link) (+link) /hurd/procfs -c /hurd/password crash-kill crash-suspend crash-dump-core crash.
Creating device nodes: fd fdX std vcs hdX hdXsY/sbin/MAKEDEV: 75: /sbin/MAKEDEV: cannot create /dev/null: Interrupted system call
 hdXs1Y/sbin/MAKEDEV: 75: /sbin/MAKEDEV: cannot create /dev/null: Interrupted system call
 sdX sdXsY sdXs1Y cdX netdde ethX loopX ttyX ptyp ptyq lprX comX random urandom kbd mouse shm.

It can also reproduced when manually running setup-translators -- but not as easily:

$ i=0 && rm -f l && while ! grep Inter < l; do echo $((++i)) && sudo /usr/lib/hurd/setup-translators -K > l 2>&1; done
[...]
112
Creating device nodes: fd fdX std vcs hdX hdXsY hdXs1Y/sbin/MAKEDEV: 75: /sbin/MAKEDEV: cannot create /dev/null: Interrupted system call

That's with:

$ readlink /bin/sh
dash

Switch to bash:

$ sudo dpkg-reconfigure dash
[No.]
$ readlink /bin/sh
bash

$ i=0 && rm -f l && while ! grep Inter < l; do echo $((++i)) && sudo /usr/lib/hurd/setup-translators -K > l 2>&1; done
[...]

Still not happened after 16800 iterations, half a day later.

So it really is related to dash, in some way. Not necessarily a bug in dash, but something that dash is doing differently (and triggers a bug somewhere else).

The next question is what was changed in (presumably) early 2013-12 that this behavior is now exhibited.

ps -AF hurd-long

By the way, after having run setup-translators for half a day, we got:

$ ps -AF hurd-long
  PID  UID  PPID  PGrp  Sess TH  Vmem   RSS %CPU     User   System Args
    1    0     1     1     1  3  146M  908K  0.0  0:00.22  0:00.23 init [2]
    2    -     1     1     1  1  146M  216K  0.0  0:00.01  0:00.01 /hurd/init root=device:hd0s1
    3    -     1     1     1  8 1.64G 48.3M  0.6  0:00.00  6:42.01 root=device:hd0s1
    4    -     2     1     1 14  135M 1.12M 12.3 15:43.29    73min /hurd/proc
    5    -     2     1     1 11  432M 31.9M 27.5 31:22.42     2hrs ext2fs --readonly --multiboot-command-line=root=device:hd0s1 --host-priv-port=1 --device-master-port=2 --exec-server-task=3 -T typed device:hd0s1
    6    -     5     1     1  4  136M 1000K  5.8  5:04.45 36:49.29 /hurd/exec
    7    -     2     1     1  4  136M  648K  1.8  0:46.65  7:22.07 /hurd/auth
    8    0     5     1     1  5  136M  772K  0.0  0:00.04  0:00.36 /hurd/term /dev/console device console
   10    0     5     1     1 17  139M  1.2M  0.3  1:13.67  6:00.96 /hurd/pflocal
   12    0     1    12    12  6  140M 12.9M  0.0  0:00.00  0:00.09 /hurd/mach-defpager
   21    0     5     1     1  3  136M 1.01M  0.0  0:00.61  0:01.39 /hurd/procfs -c
   39    0     5     1     1  2  135M  604K  0.0  0:00.00  0:00.03 /hurd/proxy-defpager
   94    0     1    15    15  6  139M 1.22M  0.4  0:03.25  0:11.16 /hurd/tmpfs --nosuid --noexec --size=10% --mode=755 tmpfs
  115    0     1    15    15  3  139M  948K  0.0  0:00.00  0:00.00 /hurd/tmpfs --noexec --nosuid --size=5242880 --mode=1777 tmpfs
  202    0     1    15    15  3  139M  944K  0.0  0:00.27  0:00.81 /hurd/tmpfs --nosuid --noexec --size=314560k --mode=1777 tmpfs
  226    0     5     1     1  2  135M  780K  0.0  0:00.00  0:00.00 /hurd/storeio hd1
  234    0     5     1     1  2  135M  768K  0.0  0:00.01  0:00.02 /hurd/storeio hd0s1
  235    0     5     1     1  2  136M  832K  0.0  0:00.00  0:00.01 /hurd/storeio hd2
  237    -    21     1     1  2  134M  788K  0.0  0:00.00  0:00.01 /hurd/mtab /
  480    0     1    15    15  9  401M 2.86M  0.0  0:27.17  1:41.08 /hurd/ext2fs /dev/hd2
[...]
 1005 1000  1000  1005  1005  2  147M 2.15M  0.0  0:00.00  0:00.02 /bin/bash
 1016    0     5     1     1  5  414M  407M  1.3  3:43.68 12:20.81 /hurd/term /dev/ptyp2 pty-master /dev/ttyp2
 1019 1000  1000  1019  1019  2  147M 2.49M  0.3  0:04.30  0:19.64 /bin/bash
 1165    0     5     1     1  2  134M  928K  0.0  0:02.42  0:16.48 /hurd/magic --directory fd
 1183    0     5     1     1  2  134M  872K  0.0  0:02.03  0:06.30 /hurd/magic tty
 1188    -     5     1     1  4  136M    1M  2.6  2:33.19 16:58.50 /hurd/null
 1208    0     5     1     1  4  136M 3.07M  0.0  0:00.67  0:03.07 /hurd/term /dev/ptyp3 pty-master /dev/ttyp3
[...]