[Digikam-devel] [Bug 156420] New: Canon EOS 400D, no thumbnails displayed then digikam segfaults

Mark Ovens parish at magichamster.com
Tue Jan 22 22:13:14 GMT 2008

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           Summary: Canon EOS 400D, no thumbnails displayed then digikam
           Product: digikam
           Version: unspecified
          Platform: FreeBSD Ports
        OS/Version: FreeBSD
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: Camera GUI
        AssignedTo: digikam-devel kde org
        ReportedBy: parish magichamster com

Version:           0.9.3 (using KDE 3.5.8)
Installed from:    FreeBSD Ports
Compiler:          gcc 3.4.6 
OS:                FreeBSD

Follow on from my post in the mailing list - http://mail.kde.org/pipermail/digikam-users/2008-January/004805.html

Running 0.9.3 under KDE 3.5.8 on FreeBSD 6.3

When I connect my Canon EOS400D (PTP Mode) the OS reports it as:

ugen0: Canon Inc. Canon Digital Camera, rev 2.00/0.02, addr 2

In digikam I connect to the camera, the camera window opens, displays 
"Connecting to camera", 'BUSY' appears on the camera LCD screen and the 
read/write LED flashes. Digikam then displays "Listing Folders....".

When digikam has finished, there are no thumbnails displayed but the 
following appears in the console:

digikam: Failed to get folders list from camera!
digikam: Libgphoto2 error: Unspecified error (-1)

Then, when I click 'Close' in the camera window in digikam, this appears 
in the console and digikam dies on a SIGSEGV:

KCrash: Application 'digikam' crashing...

The following library versions are being used:

libgphoto2  2.4.0
kipi-plugins 0.1.4
exiv2 0.14
lcms 1.17
dcraw 8.81

It was suggested that gphoto2 may be the cause (Canon problems in 2.4.0) so I downgraded gphoto2 to 2.2.1 but the problem persisted.

I then downgraded digikam back to 0.9.2 and it works correctly - even with gphoto2 2.4.0 - so it definitely seems to be a problem with digikam 0.9.3

I've done some limited debugging (using fprintf()s in both the digikam and gphoto2 code) and the problem seems to be in camlibs/ptp2/library.c at around line 2578:

                 PTPStorageIDs storageids;

        if (ptp_operation_issupported(params,PTP_OC_GetStorageIDs)) {
fprintf(stderr, ">> 2\n");
                         CPR (context, ptp_getstorageids(params,
fprintf(stderr, ">> Returned from ptp_getstorageids()\n");
                         for (i=0; i<storageids.n; i++) {
                                 char fname[PTP_MAXSTRLEN];

The fprintf()'s are my debug and it never gets to the second one so it appears to never return from ptp_getstorageids() - although this is using an optimized build rather than a debug build so may be misleading.

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