--- Begin Message ---
Package: psmisc
Version: 22.21-2
The "fuser" command does not print nothing about PID of processes that
keep busy a schroot's generated mount-point. Error messages when I
logout a schroot session:
~$ logout
E: 10mount: rmdir: failed to remove
'/var/lib/schroot/mount/kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316':
Device or resource busy
E: kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316: Chroot setup failed:
stage=setup-stop
Now I need to discover which PID keeps busy the directory:
~# fuser -m
/var/lib/schroot/mount/kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316
/var/lib/schroot/mount/kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316:
1rce 2rce 3rce 5rce 7rce 8rce 9rce 10rce
11rce 12rce 13rce 15rce 16rce 17rce 18rce 20rce
21rce 22rce 23rce 25rce 26rce 27rce 28rce 30rce
31rce 32rce 33rce 35rce 36rce 37rce 38rce 40rce
41rce 42rce 43rce 44rce 45rce 46rce 47rce 48rce
49rce 50rce 51rce 52rce 53rce 54rce 55rce 56rce
58rce 59rce 60rce 61rce 67rce 68rce 69rce 70rce
73rce 115rce 116rce 117rce 123rce 124rce 125rce 126rce
127rce 128rce 129rce 130rce 131rce 132rce 133rce 134rce
136rce 139rce 140rce 141rce 142rce 143rce 146rce 147rce
155rce 156rce 157rce 158rce 159rce 160rce 161rce 162rce
163rce 165rce 169rce 175rce 176rce 177rce 190rce 191rce
197rce 198rce 220rce 221rce 252rce 254rce 260rce 262rce
267rce 269rce 310rce 342rce 426rce 428rce 435rce 482rce
488rce 494rce 499rce 500rce 502rce 503rce 505rce 506rce
508rce 509rce 511rce 513rce 536rce 537rce 691rce 694rce
701rce 724rce 725rce 726rce 776rce 788rce 801rce 862rce
871rce 899rce 903rce 904rce 909rce 911rce 912rce 914rce
946rce 949rce 950rce 989rce 990rce 993rce 995rce 998rce
1011rce 1046rce 1048rce 1049rce 1053rce 1060rce 1064rce 1079rce
1083rce 1288rce 1301rce 1302rce 1309rce 1333rce 1337rce 1338rce
1339rce 1342rce 1346rce 1368rce 1370rce 1375rce 1384rce 1396rce
1409rce 1418rce 1421rce 1422rce 1442rce 1443rce 1952rce 1953rce
2030rce 2034rce 2061rce 2138rce 2139rce
~# fuser /var/lib/schroot/mount/kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316
~#
but nothing useful it's shown. The only way to find that PID is to
"grep" the mountinfo files into the /proc filesystem:
~$ grep -r a3ca1d7f /proc/*/mountinfo
/proc/2061/mountinfo:196 41 253:3 /
/var/lib/schroot/mount/kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316
rw,relatime shared:135 - ext4 /dev/mapper/ld0-lv2 rw,stripe=256,data=ordered
/proc/2061/mountinfo:200 196 0:14 /
/var/lib/schroot/mount/kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316/sys
rw,nosuid,nodev,noexec,relatime shared:137 master:7 - sysfs sysfs rw
/proc/2061/mountinfo:216 196 0:3 /
/var/lib/schroot/mount/kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316/proc
rw,nosuid,nodev,noexec,relatime shared:151 master:12 - proc proc rw
/proc/2061/mountinfo:218 196 0:5 /
/var/lib/schroot/mount/kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316/dev
rw,relatime shared:153 master:2 - devtmpfs udev
rw,size=10240k,nr_inodes=988768,mode=755
/proc/2061/mountinfo:223 196 0:15 /
/var/lib/schroot/mount/kubuntu-a3ca1d7f-7fce-4673-b84a-6c4835bd7316/run
rw,nosuid,relatime shared:158 master:5 - tmpfs tmpfs
rw,size=1585940k,mode=755
~$
So "2061" was the PID that I looked for. Why doesn't "fuser" find it?
******************************
* Details of the installation:
******************************
~$ uname -a
Linux itek 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u3
(2016-01-17) x86_64 GNU/Linux
~$ lsmod
Module Size Used by
binfmt_misc 16949 1
pci_stub 12429 1
vboxpci 22921 0
vboxnetadp 25540 0
vboxnetflt 27648 0
vboxdrv 375525 3 vboxnetadp,vboxnetflt,vboxpci
kvm_amd 59128 0
kvm 388784 1 kvm_amd
snd_usb_audio 135354 1
uvcvideo 79005 0
videobuf2_vmalloc 12816 1 uvcvideo
videobuf2_memops 12519 1 videobuf2_vmalloc
videobuf2_core 47787 1 uvcvideo
crc32_pclmul 12915 0
v4l2_common 12995 1 videobuf2_core
videodev 126451 3 uvcvideo,v4l2_common,videobuf2_core
snd_usbmidi_lib 23388 1 snd_usb_audio
media 18305 2 uvcvideo,videodev
snd_rawmidi 26806 1 snd_usbmidi_lib
snd_seq_device 13132 1 snd_rawmidi
aesni_intel 151423 0
nvidia 8555095 53
snd_hda_codec_hdmi 45118 1
aes_x86_64 16719 1 aesni_intel
eeepc_wmi 12600 0
asus_wmi 22781 1 eeepc_wmi
sparse_keymap 12818 1 asus_wmi
lrw 12757 1 aesni_intel
gf128mul 12970 1 lrw
snd_hda_codec_realtek 67127 1
snd_hda_codec_generic 63181 1 snd_hda_codec_realtek
rfkill 18867 1 asus_wmi
video 18096 1 asus_wmi
glue_helper 12695 1 aesni_intel
ablk_helper 12572 1 aesni_intel
snd_hda_intel 26327 6
mxm_wmi 12515 0
cryptd 14516 2 aesni_intel,ablk_helper
snd_hda_controller 26646 1 snd_hda_intel
snd_hda_codec 104500 5
snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
fam15h_power 12684 0
evdev 17445 22
pcspkr 12595 0
serio_raw 12849 0
drm 249955 3 nvidia
wmi 17339 2 mxm_wmi,asus_wmi
k10temp 12618 0
tpm_infineon 16844 0
tpm_tis 17231 0
sp5100_tco 12864 0
i2c_piix4 20864 0
edac_mce_amd 21166 0
edac_core 51465 0
shpchp 31121 0
snd_hwdep 13148 2 snd_usb_audio,snd_hda_codec
snd_pcm 88662 6
snd_usb_audio,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
i2c_core 46012 5 drm,i2c_piix4,nvidia,v4l2_common,videodev
snd_timer 26614 1 snd_pcm
tpm 31511 2 tpm_tis,tpm_infineon
acpi_cpufreq 17218 0
processor 28221 9 acpi_cpufreq
snd 65244 25
snd_hda_codec_realtek,snd_usb_audio,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_rawmidi,snd_hda_codec_generic,snd_usbmidi_lib,snd_hda_codec,snd_hda_intel,snd_seq_device
button 12944 0
soundcore 13026 2 snd,snd_hda_codec
thermal_sys 27642 2 video,processor
fuse 83350 1
autofs4 35529 2
ext4 473802 3
crc16 12343 1 ext4
mbcache 17171 1 ext4
jbd2 82522 1 ext4
dm_mod 89405 17
raid456 77553 1
async_raid6_recov 16626 1 raid456
async_memcpy 12394 2 raid456,async_raid6_recov
async_pq 12561 2 raid456,async_raid6_recov
async_xor 12429 3 async_pq,raid456,async_raid6_recov
async_tx 12566 5
async_pq,raid456,async_xor,async_memcpy,async_raid6_recov
xor 21040 1 async_xor
hid_generic 12393 0
usbhid 44460 0
hid 102264 2 hid_generic,usbhid
raid6_pq 95238 2 async_pq,async_raid6_recov
md_mod 107672 2 raid456
sg 29973 0
sr_mod 21903 0
sd_mod 44356 8
cdrom 47424 1 sr_mod
crc_t10dif 12431 1 sd_mod
crct10dif_generic 12581 0
ohci_pci 12808 0
crct10dif_pclmul 13387 1
crct10dif_common 12356 3
crct10dif_pclmul,crct10dif_generic,crc_t10dif
crc32c_intel 21809 0
ahci 33334 4
libahci 27158 1 ahci
libata 177508 2 ahci,libahci
ohci_hcd 42982 1 ohci_pci
ehci_pci 12512 0
xhci_hcd 152977 0
ehci_hcd 69837 1 ehci_pci
usbcore 195427 9
snd_usb_audio,uvcvideo,ohci_hcd,ohci_pci,snd_usbmidi_lib,ehci_hcd,ehci_pci,usbhid,xhci_hcd
scsi_mod 191405 4 sg,libata,sd_mod,sr_mod
r8169 68262 0
usb_common 12440 1 usbcore
mii 12675 1 r8169
~$ cat /etc/debian_version
8.3
~$ inxi -F
System: Host: itek Kernel: 3.16.0-4-amd64 x86_64 (64 bit) Desktop:
KDE 4.14.2
Distro: Debian GNU/Linux 8
Machine: Mobo: ASUSTeK model: M5A99X EVO R2.0 v: Rev 1.xx
Bios: American Megatrends v: 2103 date: 11/07/2013
CPU: Octa core AMD FX-8350 Eight-Core (-MCP-) cache: 16384 KB
Clock Speeds: 1: 1400 MHz 2: 2800 MHz 3: 1400 MHz 4: 1400 MHz
5: 1400 MHz 6: 1400 MHz
7: 1400 MHz 8: 1400 MHz
Graphics: Card: NVIDIA GK208 [GeForce GT 630 Rev. 2]
Display Server: X.Org 1.16.4 driver: nvidia Resolution:
1440x900@59.89hz
GLX Renderer: GeForce GT 630/PCIe/SSE2 GLX Version: 4.5.0
NVIDIA 352.41
Audio: Card-1 NVIDIA Device 0e0f driver: snd_hda_intel Sound: ALSA
v: k3.16.0-4-amd64
Card-2 Advanced Micro Devices [AMD/ATI] SBx00 Azalia (Intel
HDA) driver: snd_hda_intel
Card-3 Logitech Webcam C270 driver: USB Audio
Network: Card: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
Controller driver: r8169
IF: eth0 state: up speed: 100 Mbps duplex: full mac:
e0:3f:49:14:29:89
Drives: HDD Total Size: 4000.8GB (8.7% used) ID-1: /dev/sda model:
ST1000DM003 size: 1000.2GB
ID-2: /dev/sdb model: ST1000DM003 size: 1000.2GB
ID-3: /dev/sdc model: ST1000DM003 size: 1000.2GB
ID-4: /dev/sdd model: ST1000DM003 size: 1000.2GB
Partition: ID-1: / size: 28G used: 7.3G (28%) fs: ext4 dev: /dev/dm-0
RAID: Device-1: /dev/md0 - active raid: 5 components: online: 3/3 -
sdc1 sdb1 sda1 spare: sdd1
Sensors: System Temperatures: cpu: 10.6C mobo: N/A gpu: 28C
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 193 Uptime: 1:27 Memory: 1213.5/7743.8MB Client:
Shell (bash) inxi: 2.1.28
********************************************
* Some details of the schroot configuration:
********************************************
~$ cat /etc/schroot/desktop/fstab
# fstab: static file system information for chroots.
# Note that the mount point will be prefixed by the chroot path
# (CHROOT_PATH)
#
# <file system> <mount point> <type> <options> <dump> <pass>
/sys /sys sysfs rw,bind 0 0
/proc /proc proc rw,bind 0 0
/dev /dev devtmpfs rw,bind 0 0
/dev/pts /dev/pts devpts rw,bind 0 0
# /home /home none rw,bind 0 0
# /tmp /tmp none rw,bind 0 0
# If you use gdm3, uncomment this line to allow Xauth to work
#/var/run/gdm3 /var/run/gdm3 none rw,bind 0 0
# For PulseAudio and other desktop-related things
#/var/lib/dbus /var/lib/dbus ext4 rw,bind 0 0
# It may be desirable to have access to /run, especially if you wish
# to run additional services in the chroot. However, note that this
# may potentially cause undesirable behaviour on upgrades, such as
# killing services on the host.
/run /run tmpfs rw,bind 0 0
/sys/kernel/security /sys/kernel/security securityfs rw,bind 0
0
/dev/shm /dev/shm tmpfs rw,bind 0 0
/run/lock /run/lock tmpfs rw,bind 0 0
# /run/shm /run/shm tmpfs rw,bind 0 0
/sys/fs/cgroup/ /sys/fs/cgroup/ tmpfs rw,bind 0 0
/sys/fs/cgroup/systemd /sys/fs/cgroup/systemd cgroup rw,bind 0
0
/sys/fs/pstore /sys/fs/pstore pstore rw,bind 0 0
/sys/fs/cgroup/cpuset /sys/fs/cgroup/cpuset cgroup rw,bind 0
0
/sys/fs/cgroup/cpu,cpuacct /sys/fs/cgroup/cpu,cpuacct cgroup rw,bind
0 0
/sys/fs/cgroup/devices /sys/fs/cgroup/devices cgroup rw,bind 0
0
/sys/fs/cgroup/freezer /sys/fs/cgroup/freezer cgroup rw,bind 0
0
/sys/fs/cgroup/net_cls,net_prio /sys/fs/cgroup/net_cls,net_prio cgroup
rw,bind 0 0
/sys/fs/cgroup/blkio /sys/fs/cgroup/blkio cgroup rw,bind 0 0
/sys/fs/cgroup/perf_event /sys/fs/cgroup/perf_event cgroup rw,bind
0 0
/proc/sys/fs/binfmt_misc /proc/sys/fs/binfmt_misc autofs rw,bind
0 0
/sys/kernel/debug /sys/kernel/debug debugfs rw,bind 0 0
/dev/mqueue /dev/mqueue mqueue rw,bind 0 0
/dev/hugepages /dev/hugepages hugetlbfs rw,bind 0 0
# /sys/kernel/config /sys/kernel/config configfs rw,bind 0 0
# /sys/fs/fuse/connections /sys/fs/fuse/connections fusectl rw,bind
0 0
# tmpfs /run/user/1000 tmpfs
rw,nosuid,nodev,relatime,size=792100k,mode=700,uid=1000,gid=1000
0 0
~$ cat /etc/schroot/chroot.d/kubuntu.conf
[kubuntu]
description=Kubuntu 15.10
type=block-device
device=/dev/mapper/ld0-lv2
users=my-username
preserve-environment=false
environment-filter=XDG_RUNTIME_DIR
profile=desktop
setup.nssdatabases=
~$
***************************
* How to reproduce the bug:
***************************
Once configured schroot you can start a schroot session:
$ schroot -c kubuntu --
~$
Now open a new terminal and having cups already running as root type:
~# service cups restart
~#
then logout schroot's session (with errors):
~$ logout
E: 10mount: rmdir: failed to remove
'/var/lib/schroot/mount/kubuntu-d2c072e7-7e0c-4cfc-b48e-73defe8a4f0a':
Device or resource busy
E: kubuntu-d2c072e7-7e0c-4cfc-b48e-73defe8a4f0a: Chroot setup failed:
stage=setup-stop
Now fuser won't report cups as the process that keeps busy the
mount-point. Please note that maybe this issue affect also docker's
mount-point, I don't know, I never tried.
Thanks for your attenction, best regards.
--
Franco Martelli
--- End Message ---
