Re: does anyone else get a core dump from ldconfig when booting amd64-current?

[Nicolas Joly <njoly%pasteur.fr@localhost>]

On Sun, Jan 25, 2009 at 02:28:03AM +0000, Christos Zoulas wrote:
> In article <20090125012631.GA84416%medusa.sis.pasteur.fr@localhost>,
> Nicolas Joly  <njoly%pasteur.fr@localhost> wrote:
> >On Sun, Jan 25, 2009 at 12:45:14AM +0000, Christos Zoulas wrote:
[...]
> >njoly@lanfeust [~]> ktrace -di ./dummy
> >zsh: bus error (core dumped)  ktrace -di ./dummy
> >[...]
> >   521      1 dummy    CALL  netbsd32_open(0xffffd490,0,0)
> >   521      1 dummy    NAMI  "/emul/netbsd32/usr/lib/i386/libc.so.12"
> >   521      1 dummy    NAMI  "/usr/lib/i386/libc.so.12"
> >   521      1 dummy    RET   netbsd32_open 3
> >   521      1 dummy    CALL  netbsd32___fstat50(3,0xffffd3d0)
> >   521      1 dummy    RET   netbsd32___fstat50 0
> >   521      1 dummy    CALL  netbsd32_close(3)
> >   521      1 dummy    RET   netbsd32_close 0
> >   521      1 dummy    PSIG  SIGBUS SIG_DFL: code=SI_USER sent by
> >pid=-67194868, uid=0)
> >   521      1 dummy    NAMI  "dummy.core"
> 
> Yes, I saw this. My theory is that the information that it gets from
> stat is broken, and it does not load libc, but instead closes the fd.
> I found the bug in the stat conversion and I committed a fix but I
> doubt that this is the problem.

This is an alignment problem, with netbsd32_{timespec,timeval}
structures ... Looks like the amd64 kernel use 64bit aligment, while
`cc -m32' compiled programs expect 32bit aligned objects. The kernel
structure is then larger than the userland expected one. Kaboom !!!

Not sure if this is a correct fix, but packing the netbsd32 structures
make all of this work again.

-- 
Nicolas Joly

Biological Software and Databanks.
Institut Pasteur, Paris.

Index: sys/compat/netbsd32/netbsd32.h
===================================================================
RCS file: /cvsroot/src/sys/compat/netbsd32/netbsd32.h,v
retrieving revision 1.79
diff -u -p -r1.79 netbsd32.h
--- sys/compat/netbsd32/netbsd32.h      11 Jan 2009 02:45:49 -0000      1.79
+++ sys/compat/netbsd32/netbsd32.h      27 Jan 2009 16:34:06 -0000
@@ -182,7 +182,7 @@ typedef netbsd32_pointer_t netbsd32_time
 struct netbsd32_timespec {
        netbsd32_time_t tv_sec;                 /* seconds */
        netbsd32_long   tv_nsec;        /* and nanoseconds */
-};
+} __packed;
 
 typedef netbsd32_pointer_t netbsd32_timeval50p_t;
 struct netbsd32_timeval50 {
@@ -194,7 +194,7 @@ typedef netbsd32_pointer_t netbsd32_time
 struct netbsd32_timeval {
        netbsd32_time_t tv_sec;         /* seconds */
        netbsd32_long   tv_usec;        /* and microseconds */
-};
+} __packed;
 
 typedef netbsd32_pointer_t netbsd32_timezonep_t;
 struct netbsd32_timezone {