[K42-discussion] crash in autoconf's mmap test

[Bryan S Rosenburg]

k42-discussion-bounces at ozlabs.org wrote on 09/08/2005 10:18:11 PM:
> Also, when I attach after the crash in GDB I get:
> 
> (gdb) bt
> #0  0x00000100400a1a48 in ?? ()
> 
> ... I've tried adding symbols from exec.so.dbg, libk42sys.so.1.dbg, 
> and /lib64/libc.so.6 (in k42-packages), but GDB still doesn't know where 
we 
> are. What symbol file do I need to use here?

As you've guessed, addresses in this range are invariably in 
dynamically-loaded libraries.  Running the program with 
LD_DEBUG=files,libs will help you determine which library.  But 
unfortunately that doesn't help much when the library comes from a stock 
distribution (as is the case here), because it seems that those libraries 
don't have symbol tables.  A simple solution in this case is to link the 
program statically (by, for example, adding "-static" to the gcc link 
step).  I found that the statically- and dynamically-linked versions fail 
in the same way, and gdb on the statically-linked executable shows the 
segfault to be occurring in malloc().

- Bryan
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