Subject: Re: port-alpha/3183: fatal kernel trap
To: None <cgd@cs.cmu.edu>
From: Brad Spencer <brad@anduin.eldar.org>
List: netbsd-bugs
Date: 02/02/1997 13:33:17
> fatal kernel trap:
>
> trap entry = 0x4 (unaligned access fault)
> a0 = 0xfffffe004a5f472c
> a1 = 0x2d
> a2 = 0x4
> pc = 0xfffffc0000351ad4
> ra = 0xfffffc00003507dc
> curproc = 0xfffffe004a5eae00
> pid = 144, comm = httpd
>
> panic: trap
"oh cool!" I've not seen an unaligned access fault in the kernel for
... a long time. 8-S
could you run gdb on the kernel binary with debugging symbols that
corresponds to the kernel you're running? (When your kernel was
built, a 'netbsd.gdb' was built at the same time as your 'netbsd'.)
Yes, not a problem.....
In gdb, 'list *0xfffffc0000351ad4' and 'list *0xfffffc00003507dc', and
reply to this message with the results.
(gdb) list *0xfffffc0000351ad4
0xfffffc0000351ad4 is in unp_internalize (../../../../kern/uipc_usrreq.c:682).
677 }
678 rp = (struct file **)(cm + 1);
679 for (i = 0; i < oldfds; i++) {
680 fp = fdp->fd_ofiles[*(int *)rp];
681 *rp++ = fp;
682 fp->f_count++;
683 fp->f_msgcount++;
684 unp_rights++;
685 }
686 return (0);
(gdb) list *0xfffffc00003507dc
0xfffffc00003507dc is in uipc_usrreq (../../../../kern/uipc_usrreq.c:219).
214 panic("uipc 2");
215 }
216 break;
217
218 case PRU_SEND:
219 if (control && (error = unp_internalize(control, p)))
220 break;
221 switch (so->so_type) {
222
223 case SOCK_DGRAM: {
Hopefully, that is helpful...
This is probably pretty repeatable, so you can probably cause the same
result on a new kernel if you need to build one from scratch to get a
'reasonable' (i.e. fitting your sources and kernel binary) netbsd.gdb.
It is completely repeatable...
If you have to build a new kernel and make it crash (so you have an
up-to-date netbsd.gdb), use the pc and ra values reported by the fatal
trap in those 'list' commands.
I actually found the panic on a system build over a month ago, so the
first thing I did was sup and build a new system. Of course, the same
thing happened.
chris
Brad Spencer - brad@anduin.eldar.org http://anduin.eldar.org