On 05/08/2013 10:37 PM, Sujith Manoharan wrote:
greearb@xxxxxxxxxxxxxxx wrote:
From: Ben Greear <greearb@xxxxxxxxxxxxxxx>
With CONFIG_ATH9K_DEBUGFS enabled, and slub memory poisoning
enabled, I see this crash on rmmod of ath9k. I'm not sure how
to fix this properly, but in the meantime, this patch to disable
the spectral scan code works around the problem for me.
With memory poisoning and the verify_mem_not_deleted code
below added, the crash looks as follows... The dentry
is not *always* freed at this point, probably because rcu
callbacks haven't completed. You still get a crash soon
after, however.
The relay file should probably be closed before calling ieee80211_unregister_hw().
The ath9k debugfs directory is created inside the phy#/ directory and that would
get cleaned up when the wiphy is unregistered.
Does this help ?
This fixes the problem for me, and certainly is less of a hack than
what I posted.
I did several module unloads with memory poisoning enabled, system
remains stable.
Tested-by: Ben Greear <greearb@xxxxxxxxxxxxxxx>
Thanks,
Ben
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
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