On Sat, Jun 05, 2004 at 03:08:06PM +0200, Manuel Bouyer wrote:
> Hi,
> I initially posted this to port-sparc, but I wonder if it may be a MI problem
> that could affect other ports with alignement contraint.
> 
> I get this under moderate load on a sparc IPX 2.0_BETA (moderate = one or 2
> kernel compiles, + some perl processes from mrtg or spamassassin) which was
> solid when it was running 1.6.x.
> 
> login: trap type 0x7: pc=0xf01c4090 npc=0xf01c4094 psr=ffffffff908010c3<EF,S,PS>
> kernel: alignment fault trap
> Stopped in pid 24633.1 (perl) at        netbsd:uvmfault_anonget+0x4:    sethi           %
> hi(0xf02e3000), %l6
> db> tr
> uvmfault_anonget(0xf335ee50, 0xf33a0d78, 0xf2fe1790, 0x5, 0x9, 0xf347c330) at ne
> tbsd:uvm_fault+0x464
> uvm_fault(0xf335ede4, 0x5, 0x7, 0xf335ee70, 0x1, 0xf335ee10) at netbsd:mem_acces
> s_fault+0x178
> mem_access_fault(0x9, 0x80, 0x10259364, 0x101cfeb0, 0x2400042, 0xf335efb0) at 0x
> f00062f4
> 
> Any idea ?
> 
> Here is what GDB says about the tr:
> (gdb) l *(uvm_fault+0x464)
> 0xf01c48dc is in uvm_fault (/local/pop1/bouyer/netbsd-2-0/src/sys/uvm/uvm_fault.c:1052).
> 1047             * also, if it is OK, then the anon's page is on the queues.
> 1048             * if the page is on loan from a uvm_object, then anonget will
> 1049             * lock that object for us if it does not fail1050             */
> 1051    
> 1052            error = uvmfault_anonget(&ufi, amap, anon);
> 1053            switch (error) {
> 1054            case 0:
> 1055                    break;
> 1056    
> (gdb) l *(mem_access_fault+0x178)
> 0xf0201f6c is in mem_access_fault (/local/pop1/bouyer/netbsd-2-0/src/sys/arch/sp
> arc/sparc/trap.c:1010).
> 1005            }
> 1006            if (rv > 0)
> 1007                    goto out;
> 1008    
> 1009            /* alas! must call the horrible vm code */
> 1010            rv = uvm_fault(&vm->vm_map, (vaddr_t)va, 0, atype);
> 1011    
> 1012            /*
> 1013             * If this was a stack access we keep track of the maximum
> 1014             * accessed stack size.  Also, if vm_fault gets a protection

The instruction "sethi %hi(0xf02e3000), %l6" should load the high 22 bits
of 0xf02e3000 into register l6 and is the first part of "uvmexp.fltanget++;".
No idea how this instruction could cause an alignment trap.
-- 
Juergen Hannken-Illjes - hannken@eis.cs.tu-bs.de - TU Braunschweig (Germany)