[digikam] [Bug 346205] New: Digikam hangs (often) saving an edited picture back to a network share.

[Gerard Dirkse]

https://bugs.kde.org/show_bug.cgi?id=346205

            Bug ID: 346205
           Summary: Digikam hangs (often) saving an edited picture back to
                    a network share.
           Product: digikam
           Version: 4.9.0
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: Image Editor
          Assignee: [hidden email]
          Reporter: [hidden email]

Initial detection:

digikambug1.jpeg: shows the image window, where the second picture in the image
window has been edited and other processes are hanging and can not be
cancelled.

digikambug2.jpeg: shows the directory where the second files is the one edited
and contains 0 bytes (so it was corrupted/lost)

digikambug3.jpeg and digikambug4.jpeg: shows what happens if you try to
terminate digikam

digikambug5.jpeg: shows that second picture is now lost.



Reproducible: Sometimes

Steps to Reproduce:
1. Edit a picture
2. Sve back to network share
3.

Actual Results:  
digikam hang

Expected Results:  
Digikam coontinues

After having recovered the second picture, problem was reproduced.  Environment
is Opensuse 13.2, Digikam 4.9 database is MYSQL on network server, pictures are
on a samba server on the network.  Laptop to network connnection is wifi
(300mbit, excellent quality).

Digikam was run in a terminal window, terminal output is in termoutput.txt, all
required kdebug output is in kdebug.dbg.  When digikam hangs directory looks
like digikambug8.jpeg. Various other outputs from ps command in psaxjf-out.txt
and psaxms-out.txt, output from lsof is in lsof.txt

My impression is that there is a serialisation problem between the various
process/threads, which gets itself into a deadly embrace.  Speed of the save is
the inducing factor.  Problem is relatively easy to create, but does not happen
all the time (but it does happen often).  A reboot is required to resolve the
hang.

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[Gerard Dirkse]

https://bugs.kde.org/show_bug.cgi?id=346205

--- Comment #1 from [hidden email] <[hidden email]> ---
Created attachment 92038
  --> https://bugs.kde.org/attachment.cgi?id=92038&action=edit
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[Gerard Dirkse]

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--- Comment #2 from [hidden email] <[hidden email]> ---
Created attachment 92039
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[Gerard Dirkse]

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--- Comment #3 from [hidden email] <[hidden email]> ---
Created attachment 92040
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[Gerard Dirkse]

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--- Comment #4 from [hidden email] <[hidden email]> ---
Created attachment 92041
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[Gerard Dirkse]

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--- Comment #5 from [hidden email] <[hidden email]> ---
Created attachment 92042
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--- Comment #6 from [hidden email] <[hidden email]> ---
Created attachment 92043
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--- Comment #7 from [hidden email] <[hidden email]> ---
Created attachment 92044
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--- Comment #8 from [hidden email] <[hidden email]> ---
Created attachment 92045
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[Gerard Dirkse]

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--- Comment #9 from [hidden email] <[hidden email]> ---
Created attachment 92046
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[Gerard Dirkse]

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--- Comment #10 from [hidden email] <[hidden email]> ---
Created attachment 92047
  --> https://bugs.kde.org/attachment.cgi?id=92047&action=edit
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[Gerard Dirkse]

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--- Comment #11 from [hidden email] <[hidden email]> ---
Created attachment 92048
  --> https://bugs.kde.org/attachment.cgi?id=92048&action=edit
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[Gerard Dirkse]

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--- Comment #12 from [hidden email] <[hidden email]> ---
Just found out that kdebug.dbg  was corrupted by subsequent run of digikam,
will reproduce again

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[Gerard Dirkse]

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--- Comment #13 from [hidden email] <[hidden email]> ---
Created attachment 92049
  --> https://bugs.kde.org/attachment.cgi?id=92049&action=edit
Terminal output 2nd reproduction

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[Gerard Dirkse]

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--- Comment #14 from [hidden email] <[hidden email]> ---
Created attachment 92050
  --> https://bugs.kde.org/attachment.cgi?id=92050&action=edit
Kdebug output second reproduction

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[Gerard Dirkse]

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--- Comment #15 from [hidden email] <[hidden email]> ---
Created attachment 92051
  --> https://bugs.kde.org/attachment.cgi?id=92051&action=edit
lsof before cancelling out of digikam

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[Gerard Dirkse]

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--- Comment #16 from [hidden email] <[hidden email]> ---
Created attachment 92052
  --> https://bugs.kde.org/attachment.cgi?id=92052&action=edit
lsof after cancelling out of digikam

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[Gerard Dirkse]

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--- Comment #17 from [hidden email] <[hidden email]> ---
Created attachment 92053
  --> https://bugs.kde.org/attachment.cgi?id=92053&action=edit
ps output before (2) and after (3) cancelling out of digikam

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[Gerard Dirkse]

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--- Comment #18 from [hidden email] <[hidden email]> ---
Now using LAN connection problem happens less often, but sometimes still hangs
'writing metadata'  Found out that by using 'lsof' which file it is writing to
and seems to hang, then to use 'exiftool' on that file will clear the hang and
all other waiting tasks hanging behind it.

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--- Comment #19 from Mac <[hidden email]> ---
Crashed after straightening, cropping an image then tried to save as new image
in local directory.

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