Martin Karlsson writes:

 > #9  0xc02dca88 in calltrap () at {standard input}:96
 > #10 0xc01e7b0b in panic (fmt=0x0) at /usr/src/sys/kern/kern_shutdown.c:528
 > #11 0xc020256e in witness_lock (lock=0xc03760c0, flags=8, file=0xc0332416 
 > "/usr/src/sys/vm/vm_fault.c", line=206)
 >     at /usr/src/sys/kern/subr_witness.c:604
 > #12 0xc01e0237 in _mtx_lock_flags (m=0xc03760c0, opts=0, file=0xc0332416 
 > "/usr/src/sys/vm/vm_fault.c", line=206) at /usr/src/sys/kern/kern_mutex.c:336

It looks like the witness mutex debugging system crashed.  This sort
of thing tends to happen when the witness data structures become
corrupt.  A frequent cause of this is a module failing to destroy a

I think the recent addition of the 

  MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);

could be causing the problem, as I do not see how its getting torn

Can you try the following patch (it may not even compile,  I don't
have a  current box handy):

(its obviously incomplete, just intended to see if it fixes the
problem you are seeing)


Index: compat/linux/linux_mib.c
RCS file: /home/ncvs/src/sys/compat/linux/linux_mib.c,v
retrieving revision 1.19
diff -u -r1.19 linux_mib.c
--- compat/linux/linux_mib.c    13 Mar 2003 22:45:43 -0000      1.19
+++ compat/linux/linux_mib.c    25 Mar 2003 23:05:08 -0000
@@ -50,7 +50,7 @@
 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
            "Linux mode");
-static struct mtx osname_lock;
+struct mtx osname_lock;
 MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);
 static char    linux_osname[LINUX_MAX_UTSNAME] = "Linux";
Index: i386/linux/linux_sysvec.c
RCS file: /home/ncvs/src/sys/i386/linux/linux_sysvec.c,v
retrieving revision 1.116
diff -u -r1.116 linux_sysvec.c
--- i386/linux/linux_sysvec.c   21 Mar 2003 19:49:34 -0000      1.116
+++ i386/linux/linux_sysvec.c   25 Mar 2003 23:07:36 -0000
@@ -885,6 +885,7 @@
+extern struct mtx osname_lock;
 static int
 linux_elf_modevent(module_t mod, int type, void *data)
@@ -925,6 +926,7 @@
                        if (bootverbose)
                                printf("Linux ELF exec handler removed\n");
+                       mtx_destroy(&osname_lock);
                } else
                        printf("Could not deinstall ELF interpreter entry\n");

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