The scratchbox documentation, and the software itself, recommends setting 
vdso=0 or writing 0 to the /proc/sys/vm/vdso_enabled.  Unfortunately neither 
of those work when using a 64-bit kernel.

It seems there is a new kernel boot option "vdso32" which is used to control 
the behaviour of vdso for 32-bit programs (such as scratchbox) running under 
64-bit kernels.  There is no /proc file to control this, however.

Please change the scratchbox documentation, and the message displayed when 
scratchbox detects the bad vdso setting, to mention that if a 64-bit kernel 
is in use, the (only) way to fix the problem is to set the vdso32=0 boot 
command line option.

Graham
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