linux-kernel - Re: [PATCH] firewire: net: fix panic in fwnet_write

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Message-ID: <4B5F4C10.9040300@s5r6.in-berlin.de>
Date:	Tue, 26 Jan 2010 21:09:52 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Илья Басин <basinilya@...il.com>
CC:	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firewire: net: fix panic in fwnet_write_complete

Stefan Richter wrote:
> My own testing on a dual core box --- peered with another Linux box
> which ran the older eth1394 --- worked OK so far for transfers of
> massive files (> 4 GiB) back and forth via FTP and ssh running on a text
> console.
> 
> But in my first attempt to use FTP on X11 --- i.e. with more concurrent
> interrupt sources --- the firewire-net box crashed very soon.  In that
> test I used Dolphin of KDE as FTP client, and the crash already happened
> after Dolphin had loaded and displayed the remote home directory and was
> peeking into files for preview data.  I got the following trace:
> 
> ------------: cut here ]------------			
> kernel: BUG at mm/slab.c:2885!  			
[...]
> EIP: is at cache_free_debugcheck+0x1e8/0x2e8		
[...]
> Call: Trace:
> ? __kfree_skb+0x6e/0x71
> ? kmem_cache_free+0x56/0xb0
> ? __kfree_skb+0x6e/0x71
> ? kfree_skb+0x2b/0x2d
> ? unix_stream_recvmsg+0x3c3/0x48d
> ? file_read_actor+0x74/0xcc
> ? sock_aio_read+0xf2/0x107
> ? do_sync_read+0x89/0xc7

Hi Илья,

I am going to send a pull request for some other unrelated firewire
fixes to Linus about tomorrow.

firewire-net on the other hand needs still more work than my
fwnet_write_complete patch since you and I now get these kmem cache
corruption related bugs.

What is your impression --- does this first incomplete fix decrease the
likelihood of crashes enough to make it worth to include it in a pull
request already?  I haven't done more extensive firewire-net tests since
last week yet, hence it is hard to tell for me how severe the new issue
is in practical use.

(Also, I have no idea yet whether I will be quick or slow to find this
other problem and whether it can be fixed in a manner that is suitable
for a mainline merge before 2.6.33 is going to be released.)
-- 
Stefan Richter
-=====-==-=- ---= ==-=-
http://arcgraph.de/sr/
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