Linux 3.10 ext4_da_writepages err -30 after remount ro

I have a device formatted with ext4 (no_auto_da_alloc,data=ordered).
During shutdown, when I try to force remount as read-only, the mounted filesystem. sync;echo "u" > /proc/sysrq-trigger
I see these ext4 errors after remount
76.209728 Emergency Remount R/O
76.282979 Emergency Remount Complete
77.188953 EXT4-fs (mmcblk0p15): ext4_da_writepages: jbd2_start: 8192 pages, ino 131067; err -30
77.205402 EXT4-fs (mmcblk0p15): ext4_da_writepages: jbd2_start: 8192 pages, ino 131067; err -30
78.220353 EXT4-fs (mmcblk0p15): ext4_da_writepages: jbd2_start: 8192 pages, ino 131067; err -30
79.246658 EXT4-fs (mmcblk0p15): ext4_da_writepages: jbd2_start: 8192 pages, ino 131067; err -30
80.261003 EXT4-fs (mmcblk0p15): ext4_da_writepages: jbd2_start: 8192 pages, ino 131067; err -30
80.272068 EXT4-fs (mmcblk0p15): ext4_da_writepages: jbd2_start: 1024 pages, ino 131067; err -30
81.300966 EXT4-fs (mmcblk0p15): ext4_da_writepages: jbd2_start: 8192 pages, ino 131067; err -30
(err 30 is -EROFS, error due to writeback to read-only filesystem).
As part of remount, I think linux will writeback all drity datas. Should no writeback occur after remount R/O. Not sure why I see these errors.
Any help is appreciated.

I would expect that sync flushes all dirty data to disk. jbd2_start() is related to journal though, maybe the filesystem tries to replay the journal log or something like this?
A few things you can do to understand the issue better. Find what inode the process try to write, use 'find -inum 131067' does the filename rings the bell?
If you are still enthusiastic about debugging the issue then the next step is to enable kernel traces to see 1) what exactly process writes the data 2) where in kernel it is stuck.
https://www.kernel.org/doc/Documentatio … events.txt
https://www.kernel.org/doc/Documentatio … ftrace.txt

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Linux logfile monitoring does not work after using "privileged datasource"

Hello!
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Thank you and kind regards,
Patrick

Hello!
After all that text, I fogrot the most essential information..
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* Microsoft System Center Cross Platform Extensions (SCX)
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* Microsoft System Center Cross Platform Extensions (SCX)
* Build number: 1.4.1-292 Labeled_Build
* Process id: 23284
* Process started: 2014-03-31T08:30:06,139Z
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Strangely I could not acces the "Action Account User" directory under /var/opt/microsoft/scx/log as "ActionAccount" user. Is it ok for the directory to have the following rights: drwx------ 2 1001 users? Instead of "1001" it should say "ActionAccount",
right?
This could be a bit far fetched, but perhaps the logfile provider can´t access logfiles as the "ActionAccount" on this server because it needs to write in the scx.log file. But as the "ActionAccount" can´t access the file, the logfile provider throws
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Don´t know if that makes sense, but right now it sounds logical to me.

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See "error -3259" here.

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Hi,
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https://help.ubuntu.com/community/WindowsDualBoot
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Hi lapen,
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Dude!
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try the reset:
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then reconfigure the router...
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Yesterday is history. Tomorrow is mystery. Today is a gift.

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======
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Settings for eth0:
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        Supported link modes:   10baseT/Half 10baseT/Full
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                                1000baseT/Full
        Supported pause frame use: No
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Then check in your BIOS (usually under APM) for any enabled power-on settings associated with PCI or PCIe bus (your NIC will use one or the other).

[SOLVED]Failed to find root device after linux (3.6) upgrade on raid 1

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[ 0.000000] tsc: Fast TSC calibration failed
:: running early hook [udev]
:: running hook [udev]
:: triggering uevents...
Waiting 10 seconds for device /dev/md1 ...
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Last edited by whoop (2012-10-16 22:51:05)

If I upgrade to linux 3.6 with this line:
HOOKS="base udev autodetect pata scsi sata mdadm filesystems usbinput fsck"
in /etc/mkinitcpio.conf, the system is able to boot.
if I upfate to linux 3.6 with this line:
HOOKS="base udev autodetect pata scsi sata mdadm_udev filesystems usbinput fsck"
in /etc/mkinitcpio.conf the system is not able to boot.
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Last edited by whoop (2012-10-16 00:13:07)

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Hi All,
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We've tested the connection outside of Labview and the Linux VME can definitely communicate with the module in xterm.
Can anyone point me in the right direction to start trouble shooting this?
When I performed the downconvert operation I recieved a bunch of warnings that stated:
C:\BPM_Labview_Files\My_LabVIEW\New folder\E_LINAC_BPM_Rev.1.0 Folder\E_LINAC_BPM_Rev.1.0.vi (E_LINAC_BPM_Rev.1.0.vi)
The object "Increment" does not support output configuration in the previous version.
The object "Divide" does not support output configuration in the previous version.
The object "Increment" does not support output configuration in the previous version.
The object "Divide" does not support output configuration in the previous version.
The object "Divide" does not support output configuration in the previous version.
The object "Multiply" does not support output configuration in the previous version.
The object "Divide" does not support output configuration in the previous version.
The object "Increment" does not support output configuration in the previous version.
The object "Divide" does not support output configuration in the previous version.
The object "Increment" does not support output configuration in the previous version.
The object "Divide" does not support output configuration in the previous version.
The object "Increment" does not support output configuration in the previous version.
The object "Divide" does not support output configuration in the previous version.
The object "Increment" does not support output configuration in the previous version.
The object "Increment" does not support output configuration in the previous version.
The object "Divide" does not support output configuration in the previous version.
The object "Boolean Array To Number" does not support output configuration in the previous version.
The object "Increment" does not support output configuration in the previous version.
The object "Multiply" does not support output configuration in the previous version.
The object "Boolean Array To Number" does not support output configuration in the previous version.
The object "Boolean Array To Number" does not support output configuration in the previous version.
The object "Increment" does not support output configuration in the previous version.
The object "Increment" does not support output configuration in the previous version.
C:\BPM_Labview_Files\My_LabVIEW\New folder\E_LINAC_BPM_Rev.1.0 Folder\PowerScan.vi (PowerScan.vi)
The object "Multiply" does not support output configuration in the previous version.
The object "Multiply" does not support output configuration in the previous version.
The object "Multiply" does not support output configuration in the previous version.
The object "Multiply" does not support output configuration in the previous version.
The object "Subtract" does not support output configuration in the previous version.
Thanks in advance,
Jason.

I guess I should also post the .VIs in case someone could give some insight as to what's breaking.
Again, I need to downconvert this from 2009 to 8.2 to run on a linux machine.
In the mean time I'll be playing around with the "save as previous version" and the tool kit options.
Thanks again in advance.
Jason.
Attachments:
E_LINAC BPM 2009.zip ‏266 KB

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Hallo,
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Apr 26 23:33:45 appstraining kernel: SCSI error : <0 0 0 0> return code = 0x20008
Apr 26 23:33:45 appstraining kernel: end_request: I/O error, dev sda, sector 309473637
Apr 26 23:33:45 appstraining kernel: Buffer I/O error on device dm-0, logical block 38658051
Apr 26 23:33:45 appstraining kernel: lost page write due to I/O error on dm-0
Consequently we get defect Blocks and Control-Files for example and database -crashes.
I didn't find any new Patches using Up2date.
Who can help?

Please refer to the link below
http://searchservervirtualization.techtarget.com/tip/0,289483,sid94_gci1248824,00.html
Best Regards
Jason

Linux 3.10 ext4_da_writepages err -30 after remount ro

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