[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Ext2 superblock fault

From: Samuel Thibault
Subject: Re: Ext2 superblock fault
Date: Mon, 3 Mar 2008 02:18:45 +0000
User-agent: Mutt/1.5.12-2006-07-14

Samuel Thibault, le Sun 02 Mar 2008 00:20:25 +0000, a écrit :
> Sometimes ext2fs just hangs, and gdb-ing it shows a huge lot of threads
> almost all blocked at hurd/ext2fs/getblk.c:236, i.e. on a dereference
> of sblock (unfortunately I forgot to ask for a backtrace).  I was
> wondering: what happens if because of memory pressure the superblock
> gets swapped out by Mach?  Is ext2fs able to read it back?  It looks to
> me like it may not be.  I don't know so much about paging, but a kind of
> problematic path I can find is:
> vm_fault() on sblock
>   calls memory_object_data_request
>     calls pager_read_page 
>   calls memory_object_data_unlock 
>     calls pager_unlock_page 
>       calls ext2_getblk 

Ok, that can't happen since in the case of the super block, the node is
of disk type.  Attached a gdb status.


Attachment: typescript
Description: Text document

reply via email to

[Prev in Thread] Current Thread [Next in Thread]