[Bug gold/12525] gold SEGV linking libgcc_s.so.1 on Solaris 11/x86

[ro at CeBiTec dot Uni-Bielefeld.DE]

http://sourceware.org/bugzilla/show_bug.cgi?id=12525

--- Comment #6 from Rainer Orth <ro at CeBiTec dot Uni-Bielefeld.DE> 2011-03-03 
15:19:05 UTC ---
> --- Comment #4 from Ian Lance Taylor <ian at airs dot com> 2011-03-02 
> 06:03:01 UTC ---
> It is possible that gdb is misleading in saying <Address NNN out of bounds>.  
> I
> don't know.  The address should be allocated via the call to mmap in

It's not: I've checked the address against the pmap output and that part
of the address space is indeed not mapped.

> Output_file::map_no_anonymous called indirectly from Output_file::open.

I see: I've set a breakpoint there and upon the first call, ::mmap
returns 

(gdb) p base
$20 = (void *) 0xfe4c1000

but

(gdb) p this->base_
$21 = (unsigned char *) 0xfe4c1000 <Address 0xfe4c1000 out of bounds>

and pmap indicates that this address is not mapped.

It turns out that this is called for the output file:

(gdb) p this->o_
$26 = 114

and with pfiles -F, I see

 114: S_IFREG mode:0755 dev:171,65630 ino:1165706 uid:2110 gid:4620 size:0
      O_RDWR|O_CREAT|O_TRUNC|O_LARGEFILE FD_CLOEXEC
     
/vol/gcc/obj/regression/trunk/11-gcc-gas-gold/build/i386-pc-solaris2.11/libgcc/libgcc_s.so.1.tmp
      offset:0

Maybe the bug is related to this section in mmap(2):

     The mmap() function allows [pa, pa + len) to  extend  beyond
     the  end  of  the  object both at the time of the mmap() and
     while the mapping persists, such as when the file is created
     prior  to  the  mmap() call and has no contents, or when the
     file is truncated. Any reference to addresses beyond the end
     of  the  object,  however,  will result in the delivery of a
     SIGBUS or SIGSEGV signal. The mmap() function cannot be used
     to implicitly extend the length of files.

    Rainer

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