Re: Re: fr1-2.16 patch for 2.6.10 kernel

Peter T. Breuer a écrit :
> "Also sprach Peter T. Breuer:"
> 
>>In article <[email protected]> you wrote:
>>
>>>So why p->rdev->bdev is NULL ?
>>
>>  rdev->bdev is null?
>>
>>Oh. OK. I'll take a look.
> 
> 
> It's fairly clear that unlock_rdev() has been run.
> 
> static void unlock_rdev(mdk_rdev_t *rdev)
> {
>         struct block_device *bdev = rdev->bdev;
>         rdev->bdev = NULL;
>         ^^^^^^^^^^^^^^^^^^^
>         if (!bdev)
>                 MD_BUG();
>         bd_release(bdev);
>         blkdev_put(bdev, BDEV_RAW);
> }
> 
> It probably has been run from export_rdev()
> 
> static void export_rdev(mdk_rdev_t * rdev)
> {
>         char b[BDEVNAME_SIZE];
>         printk(KERN_INFO "md: export_rdev(%s)\n",
>                 bdevname(rdev->bdev,b));
>         if (rdev->mddev)
>                 MD_BUG();
>         free_disk_sb(rdev);
>         list_del_init(&rdev->same_set);
> #ifndef MODULE
>         md_autodetect_dev(rdev->bdev->bd_dev);
> #endif
>         unlock_rdev(rdev);
>         ^^^^^^^^^^^^^^^^^^
>         kfree(rdev);
> }
> 
> And that could come from many places. In particular
> kick_rdev_from_array().
> 
> 
> static void kick_rdev_from_array(mdk_rdev_t * rdev)
> {
>         unbind_rdev_from_array(rdev);
>         export_rdev(rdev);
>         ^^^^^^^^^^^^^^^^^^^
> }
> 
> 
> And are you seeing this ONLY after the disk has failed to be recognized
> on reinsertion, because of a different UUID?
No. Sometimes the disk failed to be regognised, but it's not reproducible.
The only thing that i am sure is that the oops occurs only if a fast resync (with skipped blocks) as 
occured before
> 
> Humour me .... can you perform your experiment NOT with scsi disks, but
> with a pair of loopback devices as mirror components?
It's not a real scsi, It's a megaraid IDE controller
> 
>    dd if=/dev/zero bs=1k count=4k of=/tmp/core0
>    dd if=/dev/zero bs=1k count=4k of=/tmp/core1
> 
>    losetup /dev/loop0 /tmp/core0
>    losetup /dev/loop1 /tmp/core1
> 
>    mdadm -C -l 1 -n 2 -x 0 /dev/md0 /dev/loop{0,1}
> 
> ??
OK, just the time to reboot...

well... It doesn't oops !!!!!!!! really strange ....

I'm going to try with some partitions on hda....