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From: Johannes Berg <johannes@sipsolutions.net>
To: Avery Pennarun <apenwarr@gmail.com>
Cc: ath9k-devel <ath9k-devel@lists.ath9k.org>,
	linux-wireless <linux-wireless@vger.kernel.org>,
	Felix Fietkau <nbd@nbd.name>
Subject: Re: [PATCH] mac80211: debugfs var for the default aggregation timeout.
Date: Fri, 08 Apr 2016 09:01:49 +0200	[thread overview]
Message-ID: <1460098909.30678.2.camel@sipsolutions.net> (raw)
In-Reply-To: <1460098614.30678.1.camel@sipsolutions.net> (sfid-20160408_085710_192124_E4948ED0)

On Fri, 2016-04-08 at 08:56 +0200, Johannes Berg wrote:
> On Thu, 2016-04-07 at 21:32 -0400, Avery Pennarun wrote:
> 
> > 
> > Yes.  Here it is:
> > http://apenwarr.ca/tmp/mac80211-agg-status-crash.ko
> > 
> Unfortunately there are no debug symbols in this file, so it doesn't
> help me much. I can't even seem to get objdump to disassemble it
> correctly: looks like the file is in thumb, going from things
> like R_ARM_THM_CALL relocations, but even -Mforce-thumb doesn't seem
> to DRT; sta_agg_status_read+0xeb isn't even a valid instruction
> offset in regular ARM mode.
> 

It *seems* that it most likely crashes on the first access to tid_tx,
which is consistent with the story of disabling TX aggregation timeouts
reducing the chances.

So I guess we have to look for some TX aggregation teardown RCU pointer
problem?

johannes

WARNING: multiple messages have this Message-ID (diff)
From: Johannes Berg <johannes@sipsolutions.net>
To: ath9k-devel@lists.ath9k.org
Subject: [ath9k-devel] [PATCH] mac80211: debugfs var for the default aggregation timeout.
Date: Fri, 08 Apr 2016 09:01:49 +0200	[thread overview]
Message-ID: <1460098909.30678.2.camel@sipsolutions.net> (raw)
In-Reply-To: <1460098614.30678.1.camel@sipsolutions.net> (sfid-20160408_085710_192124_E4948ED0)

On Fri, 2016-04-08 at 08:56 +0200, Johannes Berg wrote:
> On Thu, 2016-04-07 at 21:32 -0400, Avery Pennarun wrote:
> 
> > 
> > Yes.??Here it is:
> > http://apenwarr.ca/tmp/mac80211-agg-status-crash.ko
> > 
> Unfortunately there are no debug symbols in this file, so it doesn't
> help me much. I can't even seem to get objdump to disassemble it
> correctly: looks like the file is in thumb, going from things
> like?R_ARM_THM_CALL relocations, but even -Mforce-thumb doesn't seem
> to DRT; sta_agg_status_read+0xeb isn't even a valid instruction
> offset in regular ARM mode.
> 

It *seems* that it most likely crashes on the first access to tid_tx,
which is consistent with the story of disabling TX aggregation timeouts
reducing the chances.

So I guess we have to look for some TX aggregation teardown RCU pointer
problem?

johannes

  reply	other threads:[~2016-04-08  7:01 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-04  5:03 ath9k(?): AP stops sending traffic to iPhone 4S until another 802.11n-capable STA joins Avery Pennarun
2016-02-16 21:28 ` Avery Pennarun
2016-02-16 21:28   ` [PATCH] mac80211: debugfs var for the default aggregation timeout Avery Pennarun
2016-02-16 21:44     ` Johannes Berg
2016-02-17  2:05     ` Sujith Manoharan
2016-02-23 10:14     ` Johannes Berg
2016-02-23 18:43       ` Avery Pennarun
2016-02-23 20:05         ` Johannes Berg
2016-04-05 23:46           ` Avery Pennarun
2016-04-05 23:46             ` [ath9k-devel] " Avery Pennarun
2016-04-06  7:40             ` Johannes Berg
2016-04-06  7:40               ` [ath9k-devel] " Johannes Berg
2016-04-08  1:32               ` Avery Pennarun
2016-04-08  1:32                 ` [ath9k-devel] " Avery Pennarun
2016-04-08  6:56                 ` Johannes Berg
2016-04-08  6:56                   ` [ath9k-devel] " Johannes Berg
2016-04-08  7:01                   ` Johannes Berg [this message]
2016-04-08  7:01                     ` Johannes Berg
2016-04-08  7:15                     ` Johannes Berg
2016-04-08  7:15                       ` [ath9k-devel] " Johannes Berg
2016-04-08  8:31                       ` Avery Pennarun
2016-04-08  8:31                         ` [ath9k-devel] " Avery Pennarun
2016-04-09  1:27                         ` Avery Pennarun
2016-04-09  1:27                           ` [ath9k-devel] " Avery Pennarun
2016-04-09  4:56                           ` Johannes Berg
2016-04-09  4:56                             ` [ath9k-devel] " Johannes Berg
2016-04-10  0:31                             ` Adrian Chadd
2016-04-10  0:31                               ` [ath9k-devel] " Adrian Chadd
2016-04-10  1:59                               ` bruce m beach
2016-04-10  2:12                                 ` [ath9k-devel] " bruce m beach
2016-04-19  1:29                                 ` Avery Pennarun
2016-04-19  1:29                                   ` [ath9k-devel] " Avery Pennarun
2016-02-16 22:05   ` ath9k(?): AP stops sending traffic to iPhone 4S until another 802.11n-capable STA joins Johannes Berg
2016-02-17  4:32     ` Avery Pennarun
2016-02-17  6:23       ` Krishna Chaitanya
2016-02-17  7:05         ` Avery Pennarun

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