0 is a valid setting for jpeg quality. I've tried saving a few jpegs with
quality level 0, and they work without causing a "Bogus marker length".

You'll need to provide more information, like the exact steps you do to
reproduce the problem, and a sample image.

- open a file
- choose "Save as..."
- if the file name extension isn't .jpg, make it be
- click Save
- choose file quality setting 0 by either using the slider or by entering from
keyboard (makes no difference which way you do that)
- if "Show preview" is on, the preview isn't generated, and message "Bogus
marker length" is output to the window where I started Gimp
- if OK is then nonetheless clicked, the saving fails with "GIMP Message" window
that says "Saving '/tmp/foo.jpg' failed: Plug-in could not save image", and
another "Bogus marker length" message is shown

I'm not sure what sample image you want, but this happens at least when original
image is a PNG or a JPEG (created by several different programs), and the saved
image can't be provided as saving fails.

Trying to save 

This is on Fedora Core 3 with Gimp from gimp-2.2.2-0.fc3.2.i386.rpm. Libs are as
following:

        libgimpwidgets-2.0.so.0 => /usr/lib/libgimpwidgets-2.0.so.0 (0x0087b000)
        libgimpcolor-2.0.so.0 => /usr/lib/libgimpcolor-2.0.so.0 (0x00291000)
        libgimpmodule-2.0.so.0 => /usr/lib/libgimpmodule-2.0.so.0 (0x00169000)
        libgimpbase-2.0.so.0 => /usr/lib/libgimpbase-2.0.so.0 (0x003b9000)
        libgimpthumb-2.0.so.0 => /usr/lib/libgimpthumb-2.0.so.0 (0x00bb9000)
        libgimpmath-2.0.so.0 => /usr/lib/libgimpmath-2.0.so.0 (0x00b4d000)
        libgtk-x11-2.0.so.0 => /usr/lib/libgtk-x11-2.0.so.0 (0x005aa000)
        libgdk-x11-2.0.so.0 => /usr/lib/libgdk-x11-2.0.so.0 (0x002a2000)
        libatk-1.0.so.0 => /usr/lib/libatk-1.0.so.0 (0x00111000)
        libgdk_pixbuf-2.0.so.0 => /usr/lib/libgdk_pixbuf-2.0.so.0 (0x00d23000)
        libm.so.6 => /lib/tls/libm.so.6 (0x00d8b000)
        libpangoxft-1.0.so.0 => /usr/lib/libpangoxft-1.0.so.0 (0x0012b000)
        libpangox-1.0.so.0 => /usr/lib/libpangox-1.0.so.0 (0x0033f000)
        libart_lgpl_2.so.2 => /usr/lib/libart_lgpl_2.so.2 (0x00206000)
        libpangoft2-1.0.so.0 => /usr/lib/libpangoft2-1.0.so.0 (0x00256000)
        libpango-1.0.so.0 => /usr/lib/libpango-1.0.so.0 (0x0021e000)
        libgobject-2.0.so.0 => /usr/lib/libgobject-2.0.so.0 (0x0016e000)
        libgmodule-2.0.so.0 => /usr/lib/libgmodule-2.0.so.0 (0x00130000)
        libdl.so.2 => /lib/libdl.so.2 (0x00133000)
        libglib-2.0.so.0 => /usr/lib/libglib-2.0.so.0 (0x003c6000)
        libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0x00cbb000)
        libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x00c31000)
        libz.so.1 => /usr/lib/libz.so.1 (0x00beb000)
        libpthread.so.0 => /lib/tls/libpthread.so.0 (0x001b7000)
        libc.so.6 => /lib/tls/libc.so.6 (0x00441000)
        libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x0095b000)
        libXrandr.so.2 => /usr/X11R6/lib/libXrandr.so.2 (0x00137000)
        libXi.so.6 => /usr/X11R6/lib/libXi.so.6 (0x0013a000)
        libXinerama.so.1 => /usr/X11R6/lib/libXinerama.so.1 (0x00142000)
        libXft.so.2 => /usr/X11R6/lib/libXft.so.2 (0x00145000)
        libXcursor.so.1 => /usr/X11R6/lib/libXcursor.so.1 (0x00157000)
        libXrender.so.1 => /usr/X11R6/lib/libXrender.so.1 (0x00160000)
        libXext.so.6 => /usr/X11R6/lib/libXext.so.6 (0x001c9000)
        /lib/ld-linux.so.2 (0x00593000)
        libexpat.so.0 => /usr/lib/libexpat.so.0 (0x00c9a000)

T

Oops, made a bogus comment above by mistake.

This is caused by a buggy patch in the fedora RPM (which was trying to fix bug
#164087).