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SubjectRe: 2.5.58 Oops when booting from initrd - kobject_del

On Tue, 14 Jan 2003 Valdis.Kletnieks@vt.edu wrote:

> On Tue, 14 Jan 2003 02:47:40 MST, "Ivan G." <ivangurdiev@attbi.com> said:
> > Kernel: 2.5.58 (everything but the tag changeset)
> >
> > My attempt to boot an initrd resulted in the following oops:
> > (scribbled down important parts)
> > =======================================================
> > unable to handle kernel NULL pointer at virtual address 00000064
>
> > Call Trace:
> > ==========
> > kobject_del+0x13/0x30
> > kobject_unregister+0x13/0x30
> > elv_unregister_queue+0x1c/0x30
> > unlink_gendisk+0x13/0x40
> > del_gendisk+0x80/0x140
> > initrd_release+0x4e/0x90
> > __fput+0xf1/0x100
> > filp_close+0x74/0xa0
> > sys_close+0x62/0xa0
> > syscall_call+0x7/0xb
> > prepare_namespace+0x13a/0x1b0
> > init+0x3a/0x160
> > init+0x0/0x160
> > kernel_thread_helper+0x5/0x18
> > ...
> > Code: 8b 70 28 85 f6 0f 84 1e 01 00 00 8b 06 85 c0 75 08 0f 0b 02

Could you please try the following patch and see if it fixes the problem?

Thanks,

-pat

===== drivers/block/elevator.c 1.36 vs edited =====
--- 1.36/drivers/block/elevator.c Sun Jan 12 08:10:40 2003
+++ edited/drivers/block/elevator.c Tue Jan 14 15:46:00 2003
@@ -431,10 +431,13 @@
void elv_unregister_queue(struct gendisk *disk)
{
request_queue_t *q = disk->queue;
- elevator_t *e = &q->elevator;
+ elevator_t *e;

- kobject_unregister(&e->kobj);
- kobject_put(&disk->kobj);
+ if (q) {
+ e = &q->elevator;
+ kobject_unregister(&e->kobj);
+ kobject_put(&disk->kobj);
+ }
}

elevator_t elevator_noop = {

-
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