cause 'invalid permissions'

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Hi folks,

I am writing a package in C. It works most of the time, but fails
occasionally by the segfault looking like:

address 0x7f55302e2700, cause 'invalid permissions'

Possible actions:
1: abort (with core dump, if enabled)
2: normal R exit
3: exit R without saving workspace
4: exit R saving workspace

I tried gdb and it appears the application hangs at

__kernel_vsyscall ()

Since it happens randomly, I am not sure what is the exactly cause. Anyone
reached the same problem? Any point is appreciated.
See the debugging section in 'Writing R Extensions' (and look at the 
call stack when you use gdb).  One of the tools there such as ASan or 
valgrind will likely pinpoint your error.
Thanks.

Max

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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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