Re: init scripts problems ?

denis bonnenfant wrote:
>> I've just checked the enbd_open() code and I see nothing suspicious
>> there _except_ maybe the "media check" that is launched in the kernel:
>>
>>         if (do_media_check) {
>>                         // PTB this invalidates buffers, if necessary
>>                         ENBD_INFO ("DISK CHECK wanted in open on 
>> device nd%s\n",
>>                                 lo->devnam);
>>                         lo->last_checked = jiffies;
>>                         check_disk_change(inode->i_bdev);
>>         }
>>
>>
>> It may be worth disabling that whole check and seeing what happens. As
>> I recall the kernel tries to read the partition table (the first
>> sectors) of the "disk" (enbd) and then adds the result to
>> /proc/partitions.
> 
>>
>> But I'm not even sure the code sticks in OPEN, rather than at the first
>> read. The WCHAN value might indicate.

OK, i can reproduce it, even with only one nbd device open.

in this case, WCHAN is page_sync for one enbd-client, and select for the others.

echo 0 > /proc/nbdinfo sometimes solves the problem, but sometimes give kernel oops... sometime recoverable removing the module, sometime not.

I will send some logs later