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Date: Tue, 1 Mar 2011 18:39:06 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: ld: fatal error - cmalloc would have returned NULL
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On Mar  1 18:26, Rainer Emrich wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Any news on this issue?
> 
> At the moment it's impossible to build libgcj during bootstrap of gcc!
> 
> I tried 1.7.7-1 and the snapshot 20110227.
> 
> Here some diagnostic:
> 
>   288 117500220 [main] ld 5884 mmap64: 0x600E0000 = mmap()
>  4283 117504503 [main] ld 5884 mmap64: addr 0, len 65536, prot 3, flags 22, fd
> - -1, off 0
>   306 117504809 [main] ld 5884 mmap64: 0x600D0000 = mmap()
>  4296 117509105 [main] ld 5884 mmap64: addr 0, len 65536, prot 3, flags 22, fd
> - -1, off 0
>   290 117509395 [main] ld 5884 mmap64: 0x600C0000 = mmap()
>  3883 117513278 [main] ld 5884 mmap64: addr 0, len 65536, prot 3, flags 22, fd
> - -1, off 0
>   416 117513694 [main] ld 5884 mmap64: 0x600B0000 = mmap()
>  4503 117518197 [main] ld 5884 mmap64: addr 0, len 65536, prot 3, flags 22, fd
> - -1, off 0

This looks like a problem in ld.  It uses mmap a lot.  In fact it uses
mmap so much that the memory allocation (which goes from top to bottom
addresses) reaches the end of the Cygwin DLL itself and beyond that.
And it doesn't mmap in a few big chunks, but rather in many small
chunks.

>   490 117518687 [main] ld 5884 seterrno_from_win_error:
> /ext/build/netrel/src/cygwin-snapshot-20110227-1/winsup/cygwin/cygheap.cc:145
> windows error 487
>    41 117518728 [main] ld 5884 geterrno_from_win_error: windows error 487 ==
> errno 22
>    42 117518770 [main] ld 5884 __set_errno: void* creturn(cygheap_types,
> cygheap_entry*, unsigned int, const char*):265 val 12

Every mmap call needs space on the cygheap, which is a special heap to
keep inforamtion for later fork or exec calls.  The cygheap resides at
the end of the Cygwin DLL.  If it's space is insufficient, the Cygwin
DLL tries to extend it.  But it can't, because the memory slot is already
taken by one of the many mmap calls.

>    45 117518815 [main] ld 5884 mmap64: 0xFFFFFFFF = mmap()
>    40 117518855 [main] ld 5884 __set_errno: void* sbrk(int):167 val 12
>    36 117518891 [main] ld 5884 __set_errno: void __set_ENOMEM():304 val 12

Therefore, the last mmap call fails and returns MAP_FAILED with errno
set to ENOMEM.

> - --- Process 5884, exception C0000005 at 0042903A

And then ld crashes, because, apparently, it neglects to check the
return value of mmap.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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