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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.
Samuel
typescript
Description: Text document
- Ext2 superblock fault, Samuel Thibault, 2008/03/01
- Re: Ext2 superblock fault,
Samuel Thibault <=
- Re: Ext2 superblock fault, Samuel Thibault, 2008/03/09
- Re: Ext2 superblock fault, Thomas Bushnell BSG, 2008/03/09
- Re: Ext2 superblock fault, Samuel Thibault, 2008/03/10
- Thread model (was: Ext2 superblock fault), olafBuddenhagen, 2008/03/11
- Re: Thread model, Neal H. Walfield, 2008/03/11
- Re: Thread model, Marcus Brinkmann, 2008/03/12
- Re: Thread model, olafBuddenhagen, 2008/03/17
- Re: Thread model, Neal H. Walfield, 2008/03/17
- Re: Thread model, olafBuddenhagen, 2008/03/18
- Re: Thread model, Thomas Bushnell BSG, 2008/03/12