[2.6.0-mm2] slab corruption during packet flood on e100

[2.6.0-mm2] slab corruption during packet flood on e100

[Lennert Buytenhek]

Hi,

When routing a large stream of UDP packets through this machine, coming
in on eth1 (e100), headed towards dummy0, I get a flood of slab corruption
messages a la below.  Box is a 2-way HT SMP machine.

Is this a known problem with the e100 driver perhaps?


thanks,
Lennert


Dec 31 11:42:05 phi kernel: Slab corruption: start=306ef74c, expend=306eff4b, problemat=306ef75e
Dec 31 11:42:05 phi kernel: Last user: [<02279033>](kfree_skbmem+0x13/0x30)
Dec 31 11:42:05 phi kernel: Data: *[snip]*28 A0 *[snip]*
Dec 31 11:42:05 phi kernel: *[snip]*
Dec 31 11:42:05 phi kernel: *[snip]*A5
Dec 31 11:42:05 phi kernel: Next: 71 F0 2C .33 90 27 02 ************************
Dec 31 11:42:05 phi kernel: slab error in check_poison_obj(): cache `size-2048': object was modified after freeing
Dec 31 11:42:05 phi kernel: Call Trace:
Dec 31 11:42:05 phi kernel:  [<0214bee9>] check_poison_obj+0x109/0x1a0
Dec 31 11:42:05 phi kernel:  [<0214dfb1>] __kmalloc+0x211/0x270
Dec 31 11:42:05 phi kernel:  [<02278e07>] alloc_skb+0x47/0xf0
Dec 31 11:42:05 phi kernel:  [<02278e07>] alloc_skb+0x47/0xf0
Dec 31 11:42:05 phi kernel:  [<42b4671e>] e100_poll+0x1ae/0x6c0 [e100]
Dec 31 11:42:05 phi kernel:  [<0210e1e8>] do_nmi+0x38/0x60
Dec 31 11:42:05 phi kernel:  [<0227dff5>] net_rx_action+0x85/0x140
Dec 31 11:42:05 phi kernel:  [<0212cff7>] do_softirq+0xc7/0xd0
Dec 31 11:42:06 phi kernel:  [<0210efaa>] do_IRQ+0x11a/0x160
Dec 31 11:42:06 phi kernel:  [<02126c10>] remove_wait_queue+0x50/0x80
Dec 31 11:42:06 phi kernel:  [<0217a2ee>] poll_freewait+0x2e/0x50
Dec 31 11:42:06 phi kernel:  [<0217b0fc>] sys_poll+0x22c/0x260
Dec 31 11:42:06 phi kernel:  [<0217a310>] __pollwait+0x0/0xd0
Dec 31 11:42:06 phi kernel:

Re: [2.6.0-mm2] slab corruption during packet flood on e100

[Andrew Morton]

Lennert Buytenhek <buytenh@gnu.org> wrote:
>
> When routing a large stream of UDP packets through this machine, coming
>  in on eth1 (e100), headed towards dummy0, I get a flood of slab corruption
>  messages a la below.  Box is a 2-way HT SMP machine.
> 
>  Is this a known problem with the e100 driver perhaps?

The experimental net driver tree has what appears to be a big e100 rewrite
in it.  Can you test 2.6.1-rc1 sometime?

Re: [2.6.0-mm2] slab corruption during packet flood on e100

[Lennert Buytenhek]

On Wed, Dec 31, 2003 at 03:23:13AM -0800, Andrew Morton wrote:

> > When routing a large stream of UDP packets through this machine, coming
> >  in on eth1 (e100), headed towards dummy0, I get a flood of slab corruption
> >  messages a la below.  Box is a 2-way HT SMP machine.
> > 
> >  Is this a known problem with the e100 driver perhaps?
> 
> The experimental net driver tree has what appears to be a big e100 rewrite
> in it.  Can you test 2.6.1-rc1 sometime?

2.6.1-rc1 seems just fine.  No packet drops, no overruns, and most
importantly, no slab corruption warnings.


--L