linux-kernel - Re: aranym bug, manifests as "ida_remove called for id=13" on recent kernels

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Date:	Mon, 11 Oct 2010 11:27:17 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: aranym bug, manifests as "ida_remove called for id=13" on recent
 kernels

Al Viro writes:
 > On Mon, Oct 11, 2010 at 12:52:56AM +0100, Al Viro wrote:
 > > On Sun, Oct 10, 2010 at 10:18:03PM +0200, Geert Uytterhoeven wrote:
 > > > >> This is on aranym-0.9.9-1 from Ubuntu/amd64.
 > > > >
 > > > > stat -L /proc/2/exec, otherwise you'll hit lstat() instead of stat().
 > > > > And FWIW 0.9.10-1 squeeze/amd64 also triggers here...
 > > > 
 > > > Still, just "stat: cannot stat `proc/2/exe': No such file or directory" here...
 > > 
 > > Interesting...  Which gcc version is used?
 > 
 > Argh...  OK, going through aranym with debugger has exhonorated it.  My
 > apologies ;-/  It *is* gcc in sid.  Testcase:
 > 
 > extern int foo(int);
 > void *bar(int n)
 > {
 >         return (void *)foo(n);
 > }
 > 
 > and gcc -S -O2 turns that into
 > bar:
 >         link.w %fp,#0
 >         unlk %fp
 >         jra foo
 > 
 > Spot the obvious bug...  BTW, why on the Earth does debian-ports m68k tree
 > use gcc-4.3 with Cthulhu-scaring 700Kb gzipped patch and does *not* have
 > gcc-4.4?

I can confirm that the bug exists in gcc-4.3.4 and gcc-4.4.5,
but it has been fixed in gcc-4.5.1 which generates:

bar:
        link.w %fp,#0
        move.l 8(%fp),-(%sp)
        jsr foo
        move.l %d0,%a0
        unlk %fp
        rts

I don't yet know the gcc PR number or svn commit # for the fix
(in case people want a backport).
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