Re: [ath9k-devel] Script to crash ath9k with DMA errors.

[Ben Greear <greearb@candelatech.com>]

On 11/29/2010 04:44 PM, Luis R. Rodriguez wrote:
> On Mon, Nov 29, 2010 at 04:28:51PM -0800, Ben Greear wrote:

>> BUG: unable to handle kernel NULL pointer dereference at 00000040
>> IP: [<f933470a>] ath_tx_start+0x461/0x5ef [ath9k]
>> *pde = 00000000
>> Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
>> last sysfs file: /sys/devices/pci0000:00/0000:00:1e.0/0000:08:01.0/irq
>> Modules linked in: aes_i586 aes_generic fuse nfs lockd fscache nfs_acl auth_rpcgss sunrpc ipv6 uinput arc4 ecb ath9k mac80211 ath9k_common ath9k_hw mi]
>>
>> Pid: 38, comm: kworker/u:1 Tainted: G        W   2.6.37-rc3-wl+ #53 PDSBM/PDSBM
>> EIP: 0060:[<f933470a>] EFLAGS: 00010246 CPU: 1
>> EIP is at ath_tx_start+0x461/0x5ef [ath9k]
>
> Please use
>
> gdb drivers/net/wireless/ath/ath9k/
> l *(ath_tx_start+0x461)
>
>    Luis

I managed to hit that ath_tx_start crash again, and this time there were no obvious
DMA or irq errors immediately preceding it.  So, it might be a real bug
after all.  I'll add some extra checks to see if tid->ac is NULL.

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com