Date: Wed, 1 Jul 2009 18:54:22 -0500 (CDT) From: Greg Rivers <gcr+freebsd-current@tharned.org> To: Kostik Belousov <kostikbel@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: Panic during shutdown Message-ID: <alpine.BSF.2.00.0907011812490.1649@blue.tharned.org> In-Reply-To: <20090701192154.GW2884@deviant.kiev.zoral.com.ua> References: <alpine.BSF.2.00.0907011139490.75481@roadkill.tharned.org> <20090701192154.GW2884@deviant.kiev.zoral.com.ua>
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On Wed, 1 Jul 2009, Kostik Belousov wrote:
>> at /usr/src/sys/vm/vm_object.c:715
>> #6 0xc064d24c in vm_object_deallocate (object=0xc4300000)
>> at /usr/src/sys/vm/vm_object.c:592
> I am interested in the output of
> p *object
> from the frame 6, and the output of
> p swap_total
> p swap_reserved
> all from kgdb.
>
...
(kgdb) frame 6
#6 0xc064d24c in vm_object_deallocate (object=0xc4300000)
at /usr/src/sys/vm/vm_object.c:592
592 vm_object_terminate(object);
(kgdb) list
587 * Don't double-terminate, we could be in a termination
588 * recursion due to the terminate having to sync data
589 * to disk.
590 */
591 if ((object->flags & OBJ_DEAD) == 0)
592 vm_object_terminate(object);
593 else
594 VM_OBJECT_UNLOCK(object);
595 object = temp;
596 }
(kgdb) p *object
$1 = {mtx = {lock_object = {lo_name = 0xc06ce176 "vm object",
lo_flags = 21168128, lo_data = 0, lo_witness = 0x0}, mtx_lock = 4},
object_list = {tqe_next = 0xc43217f8, tqe_prev = 0xc41b1454}, shadow_head = {
lh_first = 0x0}, shadow_list = {le_next = 0x0, le_prev = 0xc415c5f4},
memq = {tqh_first = 0x0, tqh_last = 0xc4300028}, root = 0x0, size = 245,
generation = 271, ref_count = 0, shadow_count = 0, type = 0 '\0',
flags = 12552, pg_color = 250, paging_in_progress = 0,
resident_page_count = 0, backing_object = 0x0, backing_object_offset = 0,
pager_object_list = {tqe_next = 0x0, tqe_prev = 0x0}, rvq = {
lh_first = 0x0}, cache = 0x0, handle = 0x0, un_pager = {vnp = {
vnp_size = 0}, devp = {devp_pglist = {tqh_first = 0x0, tqh_last = 0x0}},
swp = {swp_bcount = 0}}, uip = 0xc3d10340, charge = 1003520}
(kgdb) p swap_total
$2 = 2147483648
(kgdb) p swap_reserved
$3 = 634880
> Also, please describe the load on the machine,
>
It happens regardless of the load. For example, just booting multi-user
and immediately running shutdown (either by logging in or pressing the
ACPI power button) triggers the panic.
> ... and look up what process exited when the panic happens.
>
The panic message on the console does not show the process. Can that be
determined from kgdb? If so, how?
> Thanks for the report.
>
Thanks for looking into it!
--
Greg Rivers
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