can't mount fs back to ro

encol · 06-20-2016, 12:29 PM

I think i did something strange on my PW3: i changed fs to rw to do some tests but, when i try to go back to ro, i get:

Code:

root@kindle:root> mntroot ro
system: I mntroot:def:Making root filesystem read-only
mount: / is busy
system: E mntroot:def:Re-mounting root filesystem failed

Also a reboot does not help.
What can be?

geekmaster · 06-20-2016, 01:02 PM

Quote:

Originally Posted by encol

I think i did something strange on my PW3: i changed fs to rw to do some tests but, when i try to go back to ro, i get:

Code:

root@kindle:root> mntroot ro
system: I mntroot:def:Making root filesystem read-only
mount: / is busy
system: E mntroot:def:Re-mounting root filesystem failed

Also a reboot does not help.
What can be?

What tests? Did you install or change anything? Did you fill the root partition with a "test" file so the OS cannot write there now?

If you did create a file on root while rw, try removing it.

As a last resort, from diags SSH (CRP to get there), you could rewrite (dd) a new rootfs to main, after extracting it from an update file you can download from amazon.

encol · 06-20-2016, 01:09 PM

I simply replaced a png in the /usr/share/webkit-1.0/pillow/assets folder to see if something changes in the title bar, but i then restored the original png

knc1 · 06-20-2016, 01:46 PM

Quote:

Originally Posted by encol

I simply replaced a png in the /usr/share/webkit-1.0/pillow/assets folder to see if something changes in the title bar, but i then restored the original png

The reboot should have 'fixed' the problem.

Was the png (any of the three, the original, the replacement and/or the replaced original open?).

See if:

Code:

lsof

is installed on your kindle, perhaps filter the output with grep and the name of the file.

Also -
Is your current directory / ? (I can read the prompt you quoted - but check anyway)
That will hold it 'busy' - just cd away from /

Did your tests include starting any program(s)?
The reboot should have fixed that also, unless you messed with the initialization files.

In fact -
The reboot should have completed with / being set to ro without the need to change it to ro after the reboot.
unless, again, somebody was messing with the init files and/or the scripts they call.

Is the:
/usr/share/webkit-1.0/pillow/assets
directory even on the same file system as / ?
check that also.

Code:

stat / usr/share/webkit-1.0/pillow/assets

Compare the device major/minor of both

encol · 06-20-2016, 02:31 PM

Quote:

Originally Posted by knc1

The reboot should have 'fixed' the problem.

Was the png (any of the three, the original, the replacement and/or the replaced original open?).

See if:

Code:

lsof

is installed on your kindle, perhaps filter the output with grep and the name of the file.

lsof is installed, i greped with the name of the file, but returns nothing.

Quote:

Originally Posted by knc1

Also -
Is your current directory / ? (I can read the prompt you quoted - but check anyway)
That will hold it 'busy' - just cd away from /

i changed to /mnt/us/documents... same error

Quote:

Originally Posted by knc1

Did your tests include starting any program(s)?
The reboot should have fixed that also, unless you messed with the initialization files.

i only called:

Code:

lipc-set-prop com.lab126.pillow customDialog '{"name": "default_status_bar"}'

no changes to initialization files

Quote:

Originally Posted by knc1

Is the:
/usr/share/webkit-1.0/pillow/assets
directory even on the same file system as / ?
check that also.

Code:

stat / usr/share/webkit-1.0/pillow/assets

Compare the device major/minor of both

they're in the same file system

EDIT:
i noted a zero-sized MNTUS_EXEC file in /
it's normal?

encol · 06-20-2016, 04:59 PM

Quote:

Originally Posted by geekmaster

Then what was the point of mounting it rw?

If you cannot find out what changed to break it, you can restore the rootfs with an image from an update. CRP, diags, ssh, dd. At least it can still boot as-is. It could be worse.

maybe it isn't worth dd-ing rootfs for this...
i'll keep my writable fs for now

knc1 · 06-20-2016, 11:19 PM

Quote:

Originally Posted by encol

lsof is installed, i greped with the name of the file, but returns nothing.

i changed to /mnt/us/documents... same error

i only called:

Code:

lipc-set-prop com.lab126.pillow customDialog '{"name": "default_status_bar"}'

no changes to initialization files

they're in the same file system

EDIT:
i noted a zero-sized MNTUS_EXEC file in /
it's normal?

It is required to run executable from USB storage.

knc1 · 06-20-2016, 11:20 PM

read the mntroot script carefully - lab126 might have screwed it up.

geekmaster · 06-20-2016, 11:26 PM

And from SSH, you should be able to just do a "mount -o ro" command (with more params) just like the mntroot script does. Though if it comes back rebooting, that is confuzzling...

knc1 · 06-20-2016, 11:31 PM

Quote:

Originally Posted by geekmaster

And from SSH, you should be able to just do a "mount -o ro" command (with more params) just like the mntroot script does. Though if it comes back rebooting, that is confuzzling...

And if that comes back a "/ busy" -
Then Lab126 changed (and screwed up) their 'pivot root' code in the initramfs scripting.

encol · 06-21-2016, 05:01 AM

Quote:

Originally Posted by geekmaster

And from SSH, you should be able to just do a "mount -o ro" command (with more params) just like the mntroot script does. Though if it comes back rebooting, that is confuzzling...

the mntroot script simply does a

Code:

/bin/mount -o remount,ro /

same result from SSH

knc1 · 06-21-2016, 07:41 AM

cut and paste the output of:

Code:

mount

please

encol · 06-21-2016, 10:48 AM

Quote:

Originally Posted by knc1

cut and paste the output of:

Code:

mount

please

Here it is:

Code:

rootfs on / type rootfs (rw)
/dev/root on / type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
none on /proc type proc (rw,nosuid,nodev,noexec,relatime)
none on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev type tmpfs (rw,relatime,mode=755)
tmpfs on /dev/shm type tmpfs (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
tmpfs on /var type tmpfs (rw,relatime,size=32768k)
/dev/loop/2 on /usr/share/X11/xkb type cramfs (ro,noatime,nodiratime)
/dev/loop/3 on /usr/java/lib/fonts type cramfs (ro,noatime,nodiratime)
/dev/loop/4 on /etc/kdb.src type cramfs (ro,noatime,nodiratime)
/dev/loop/5 on /usr/lib/locale type cramfs (ro,noatime,nodiratime)
/dev/loop/6 on /usr/share/keyboard type cramfs (ro,noatime,nodiratime)
/dev/mmcblk0p3 on /var/local type ext3 (rw,relatime,errors=continue,barrier=0,data=writeback)
/dev/loop/0 on /mnt/base-us type vfat (rw,noexec,noatime,nodiratime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro)
fsp on /mnt/us type fuse.fsp (rw,nosuid,nodev,noatime,user_id=0,group_id=0,allow_other)
tmpfs on /chroot/dev/log (deleted) type tmpfs (rw,relatime,mode=755)
tmpfs on /chroot/dev/random type tmpfs (rw,relatime,mode=755)
tmpfs on /chroot/dev/urandom type tmpfs (rw,relatime,mode=755)
tmpfs on /chroot/dev/shm type tmpfs (rw,relatime)
none on /chroot/sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /chroot/var/cache type tmpfs (rw,relatime,size=32768k)
tmpfs on /chroot/var/lock type tmpfs (rw,relatime,size=32768k)
tmpfs on /chroot/var/run type tmpfs (rw,relatime,size=32768k)
/dev/loop/4 on /chroot/etc/kdb.src type cramfs (ro,noatime,nodiratime)
/dev/mmcblk0p3 on /chroot/var/local type ext3 (rw,relatime,errors=continue,barrier=0,data=writeback)
fsp on /chroot/mnt/us type fuse.fsp (rw,nosuid,nodev,noatime,user_id=0,group_id=0,allow_other)
none on /chroot/proc type proc (rw,nosuid,nodev,noexec,relatime)
/dev/root on /chroot/etc/fonts type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/etc/gtk-2.0 type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/etc/pango type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/etc/resolv.d type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/usr/share type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
/dev/root on /chroot/usr/ssl type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
/dev/loop/6 on /chroot/usr/share/keyboard type cramfs (ro,noatime,nodiratime)
/dev/loop/3 on /chroot/usr/java/lib/fonts type cramfs (ro,noatime,nodiratime)
/dev/loop/2 on /chroot/usr/share/X11/xkb type cramfs (ro,noatime,nodiratime)
/dev/root on /chroot/usr/lib/pango type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
/dev/loop/5 on /chroot/usr/lib/locale type cramfs (ro,noatime,nodiratime)

geekmaster · 06-21-2016, 11:13 AM

Quote:

Originally Posted by encol

Here it is:

Code:

rootfs on / type rootfs (rw)
/dev/root on / type ext3 (rw,noatime,nodiratime,barrier=0,data=writeback)
...

The "mount" command on my PW3 gives this:

Code:

rootfs on / type rootfs (rw)
/dev/root on / type ext3 (ro,noatime,nodiratime,barrier=0,data=writeback)
...

Notice that rootfs is 'rw' like yours, but '/dev/root' is different.

Because TWO things are mounted on '/', try remounting '/dev/root' instead. That may also explain why the mntroot script fails -- it only tries to remount the FIRST '/', which is always busy. It should probably remount the device instead of the shared mountpoint.

But the real question is WHY rebooting continues to mount it 'rw'. The answer probably hides in an upstart script, perhaps triggered by some persistent residue from the first time you remounted it.

encol · 06-21-2016, 11:44 AM

Code:

root@kindle:extensions> /bin/mount -o remount,ro /dev/root
mount: / is busy

my upstart folder contains (ordered by time reversed):

Code:

root@kindle:extensions> ll -rt /etc/upstart/

   3 -rwxr-xr-x    1 root     root        2.1K Apr 17 20:24 mzforce2
   3 -rwxr-xr-x    1 root     root        2.1K Apr 17 20:24 mzforce
   1 -rw-r--r--    1 root     root         302 Apr 17 20:24 mx_setup.conf
   4 -rw-r--r--    1 root     root        3.0K Apr 17 20:24 mx_monitor.conf
   1 -rw-r--r--    1 root     root         343 Apr 17 20:24 mx_cleanup.conf
   2 -rw-r--r--    1 root     root        1.4K Apr 17 20:24 mx.conf
   2 -rw-r--r--    1 root     root        1.6K Apr 17 20:24 mwifis.conf
   3 -rw-r--r--    1 root     root        2.3K Apr 17 20:24 mwifim.conf
   2 -rw-r--r--    1 root     root        1.1K Apr 17 20:24 mwifid.conf
   1 -rwxr-xr-x    1 root     root         191 Apr 17 20:24 mwhiskey_button
   1 -rw-r--r--    1 root     root         188 Apr 17 20:24 mwfmupdate.conf
   1 -rw-r--r--    1 root     root         327 Apr 17 20:24 mwebreader.conf
   1 -rw-r--r--    1 root     root          98 Apr 17 20:24 mwandwrapper.conf
   1 -rw-r--r--    1 root     root         819 Apr 17 20:24 mwand.conf
   2 -rwxr-xr-x    1 root     root        1.8K Apr 17 20:24 mwan
   1 -rw-r--r--    1 root     root         335 Apr 17 20:24 mvolumd.conf
   1 -rw-r--r--    1 root     root         629 Apr 17 20:24 mvnc.conf
  10 -rwxr-xr-x    1 root     root        9.1K Apr 17 20:24 muserstore
   1 -rw-r--r--    1 root     root         354 Apr 17 20:24 musbnetd.conf
   1 -rw-r--r--    1 root     root         499 Apr 17 20:24 musbnet-autostart.conf
   5 -rw-r--r--    1 root     root        4.1K Apr 17 20:24 mupstart_functions
   1 -rwxr-xr-x    1 root     root         626 Apr 17 20:24 mtouch
   1 -rw-r--r--    1 root     root         237 Apr 17 20:24 mtodo.conf
   1 -rw-r--r--    1 root     root         268 Apr 17 20:24 mtmpfs_scan.conf
   1 -rw-r--r--    1 root     root         231 Apr 17 20:24 mtmd.conf
   2 -rw-r--r--    1 root     root        1.0K Apr 17 20:24 mtestd.conf
   2 -rw-r--r--    1 root     root        1.4K Apr 17 20:24 msystem_setup_after_shpm.conf
   1 -rw-r--r--    1 root     root         327 Apr 17 20:24 msystem_setup.conf
   2 -rw-r--r--    1 root     root        1.6K Apr 17 20:24 msystem_monitor.conf
   2 -rw-r--r--    1 root     root        1.5K Apr 17 20:24 msystem_cramfs_loopbacks.conf
   5 -rw-r--r--    1 root     root        4.8K Apr 17 20:24 msystem.conf
   1 -rw-r--r--    1 root     root         393 Apr 17 20:24 msyslog.conf
   1 -rw-r--r--    1 root     root         498 Apr 17 20:24 mstored.conf
   1 -rw-r--r--    1 root     root         229 Apr 17 20:24 mstackdumpd.conf
   1 -rw-r--r--    1 root     root         397 Apr 17 20:24 msshd.conf
   1 -rw-r--r--    1 root     root         502 Apr 17 20:24 msplash.conf
   1 -rwxr-xr-x    1 root     root         655 Apr 17 20:24 msplash
  18 -rwxr-xr-x    1 root     root       16.6K Apr 17 20:24 mshutdown_special
   3 -rwxr-xr-x    1 root     root        2.6K Apr 17 20:24 mshutdown_showimage
   1 -rw-r--r--    1 root     root         754 Apr 17 20:24 mshutdown_modes
   4 -rw-r--r--    1 root     root        3.2K Apr 17 20:24 mshutdown.conf
   1 -rw-r--r--    1 root     root         500 Apr 17 20:24 mscanner.conf
   1 -rw-r--r--    1 root     root         472 Apr 17 20:24 mrecevent.conf
   1 -rw-r--r--    1 root     root         215 Apr 17 20:24 mrcm.conf
   2 -rw-r--r--    1 root     root        1.3K Apr 17 20:24 mprintklogs.conf
   5 -rw-r--r--    1 root     root        5.0K Apr 17 20:24 mprereg.conf
   1 -rw-r--r--    1 root     root         385 Apr 17 20:24 mpowerd.conf
   1 -rw-r--r--    1 root     root         298 Apr 17 20:24 mpoll_daemons.conf
   1 -rw-r--r--    1 root     root         528 Apr 17 20:24 mpillow.conf
   1 -rw-r--r--    1 root     root         401 Apr 17 20:24 mphd.conf
   1 -rw-r--r--    1 root     root         238 Apr 17 20:24 motav3.conf
   4 -rw-r--r--    1 root     root        3.4K Apr 17 20:24 mota-update.conf
   1 -rw-r--r--    1 root     root         266 Apr 17 20:24 mnetwork.conf
   1 -rw-r--r--    1 root     root         303 Apr 17 20:24 mmonitor_wand_threads.conf
   4 -rwxr-xr-x    1 root     root        3.1K Apr 17 20:24 mmonitor_functions
   2 -rw-r--r--    1 root     root        1.2K Apr 17 20:24 mmodules.conf
   5 -rw-r--r--    1 root     root        4.3K Apr 17 20:24 mmesquite_functions
   3 -rwxr-xr-x    1 root     root        2.3K Apr 17 20:24 mmesquite_copy
   1 -rw-r--r--    1 root     root         266 Apr 17 20:24 mmcsd.conf
  10 -rwxr-xr-x    1 root     root        9.6K Apr 17 20:24 mmakexconfig
   1 -rw-r--r--    1 root     root         320 Apr 17 20:24 mlipcd.conf
   1 -rw-r--r--    1 root     root         667 Apr 17 20:24 mlibc_err_patterns.txt
   5 -rw-r--r--    1 root     root        4.1K Apr 17 20:24 mlangpicker.conf
   1 -rw-r--r--    1 root     root         252 Apr 17 20:24 mlab126_gui_setup.conf
   2 -rw-r--r--    1 root     root        1.2K Apr 17 20:24 mlab126_gui_monitor.conf
   3 -rw-r--r--    1 root     root        2.5K Apr 17 20:24 mlab126_gui.conf
   1 -rw-r--r--    1 root     root         180 Apr 17 20:24 mlab126.conf
   1 -rw-r--r--    1 root     root         142 Apr 17 20:24 mkindle.conf
   1 -rw-r--r--    1 root     root         173 Apr 17 20:24 mkfxreader.conf
   1 -rw-r--r--    1 root     root         279 Apr 17 20:24 mkb.conf
   1 -rw-r--r--    1 root     root         462 Apr 17 20:24 mivona_ttsd.conf
   2 -rwxr-xr-x    1 root     root        1.2K Apr 17 20:24 minit.sh
   2 -rwxr-xr-x    1 root     root        1.8K Apr 17 20:24 mhaptics
  17 -rw-r--r--    1 root     root       15.4K Apr 17 20:24 mfunctions
   5 -rw-r--r--    1 root     root        4.9K Apr 17 20:24 mframework_setup.conf
   2 -rw-r--r--    1 root     root        1.5K Apr 17 20:24 mframework.conf
   6 -rwxr-xr-x    1 root     root        6.0K Apr 17 20:24 mframework
   3 -rwxr-xr-x    1 root     root        2.4K Apr 17 20:24 mfirsttime
   7 -rw-r--r--    1 root     root        6.7K Apr 17 20:24 mfilesystems_var_local.conf
   1 -rw-r--r--    1 root     root         551 Apr 17 20:24 mfilesystems_userstore.conf
   1 -rw-r--r--    1 root     root         609 Apr 17 20:24 mfilesystems_setup.conf
   1 -rw-r--r--    1 root     root         202 Apr 17 20:24 mfilesystems.conf
   1 -rwxr-xr-x    1 root     root         511 Apr 17 20:24 menv
   1 -rw-r--r--    1 root     root         253 Apr 17 20:24 mdynconfig.conf
   1 -rw-r--r--    1 root     root         236 Apr 17 20:24 mdpmd.conf
   1 -rw-r--r--    1 root     root         223 Apr 17 20:24 mdmld.conf
   1 -rw-r--r--    1 root     root         317 Apr 17 20:24 mdisplay.conf
   5 -rwxr-xr-x    1 root     root        4.2K Apr 17 20:24 mdisplay
   1 -rw-r--r--    1 root     root         362 Apr 17 20:24 mdevcap.conf
   1 -rw-r--r--    1 root     root         996 Apr 17 20:24 mdbus.conf
   3 -rwxr-xr-x    1 root     root        2.1K Apr 17 20:24 mcyttsp
   1 -rw-r--r--    1 root     root         270 Apr 17 20:24 mcron.conf
   2 -rw-r--r--    1 root     root        1.0K Apr 17 20:24 mconsole.conf
   1 -rw-r--r--    1 root     root         717 Apr 17 20:24 mcmd.conf
   3 -rw-r--r--    1 root     root        2.8K Apr 17 20:24 mchroot.conf
  12 -rwxr-xr-x    1 root     root       11.8K Apr 17 20:24 mbundlefuncs
   3 -rw-r--r--    1 root     root        3.0K Apr 17 20:24 mblanket_functions
   1 -rw-r--r--    1 root     root         281 Apr 17 20:24 mbattery.conf
   4 -rwxr-xr-x    1 root     root        3.7K Apr 17 20:24 mbattery
   2 -rw-r--r--    1 root     root        1.9K Apr 17 20:24 masr_setup.conf
   1 -rw-r--r--    1 root     root         253 Apr 17 20:24 marchive.conf
   2 -rw-r--r--    1 root     root        1.0K Apr 17 20:24 mappmgrd.conf
   1 -rw-r--r--    1 root     root         448 Apr 17 20:24 macxmgrd.conf
   1 -rw-r--r--    1 root     root         181 Apr 17 20:24 mwfmdelete.conf
   1 -rw-r--r--    1 root     root         180 Apr 17 20:24 mtouch.conf
   1 -rw-r--r--    1 root     root         239 Apr 17 20:24 motaupd.conf
   2 -rw-r--r--    1 root     root        1.5K Apr 17 20:24 mmigrate_db.conf
   1 -rw-r--r--    1 root     root         744 Apr 17 20:24 mearly_progress.conf
   1 -rw-r--r--    1 root     root         387 Apr 17 20:24 mdeviced.conf
   1 -rw-r--r--    1 root     root         107 Apr 17 20:24 mcontentpackd.conf
   1 -rw-r--r--    1 root     root         710 Apr 17 20:24 mcontentpack_fonts_dependency.conf
   1 -rw-r--r--    1 root     root         848 Apr 17 20:24 masr.conf
   4 -rw-rw-r--    1 root     root        3.2K May 15 00:23 mbridge.conf
   4 -rwxrwxr-x    1 root     root        3.3K May 28 14:14 musbnet.conf
   2 -rwxrwxr-x    1 root     root        1.8K May 28 14:14 musbnet-preinit.conf
   1 -rw-r--r--    1 root     root         246 Jun 15 18:35 mdebrick.conf
   1 -rwxr-xr-x    1 root     root         629 Jun 15 18:35 mdebrick
   1 -rw-r--r--    1 root     root         871 Jun 15 18:38 mcowardsdebrick.conf

as i see from the dates, the only scripts changed/added are the last six, which are not my stuff

06-20-2016, 12:29 PM	#1
encol Evangelist Posts: 416 Karma: 765432 Join Date: Apr 2016 Location: Italy Device: Kindle PW3 5.8.5.0.1	can't mount fs back to ro I think i did something strange on my PW3: i changed fs to rw to do some tests but, when i try to go back to ro, i get: Code: root@kindle:root> mntroot ro system: I mntroot:def:Making root filesystem read-only mount: / is busy system: E mntroot:def:Re-mounting root filesystem failed Also a reboot does not help. What can be?

06-20-2016, 01:09 PM	#3
encol Evangelist Posts: 416 Karma: 765432 Join Date: Apr 2016 Location: Italy Device: Kindle PW3 5.8.5.0.1	I simply replaced a png in the /usr/share/webkit-1.0/pillow/assets folder to see if something changes in the title bar, but i then restored the original png Last edited by encol; 06-20-2016 at 01:12 PM.

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06-20-2016, 11:20 PM	#8
knc1 Going Viral Posts: 17,212 Karma: 18210809 Join Date: Feb 2012 Location: Central Texas Device: No K1, PW2, KV, KOA	read the mntroot script carefully - lab126 might have screwed it up.

06-20-2016, 11:26 PM	#9
geekmaster Carpe diem, c'est la vie. Posts: 6,433 Karma: 10773670 Join Date: Nov 2011 Location: Multiverse 6627A Device: K1 to PW3	And from SSH, you should be able to just do a "mount -o ro" command (with more params) just like the mntroot script does. Though if it comes back rebooting, that is confuzzling...

06-21-2016, 07:41 AM	#12
knc1 Going Viral Posts: 17,212 Karma: 18210809 Join Date: Feb 2012 Location: Central Texas Device: No K1, PW2, KV, KOA	cut and paste the output of: Code: mount please