From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Miles Lane <miles.lane@gmail.com>
Cc: Vivek Goyal <vgoyal@redhat.com>, Eric Paris <eparis@redhat.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>, Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
nauman@google.com, eric.dumazet@gmail.com,
netdev@vger.kernel.org, Jens Axboe <jens.axboe@oracle.com>,
Gui Jianfeng <guijianfeng@cn.fujitsu.com>,
Li Zefan <lizf@cn.fujitsu.com>,
Johannes Berg <johannes@sipsolutions.net>
Subject: Re: 2.6.34-rc5-git6 (plus all patches) -- new INFO: suspicious rcu_dereference_check() usage.
Date: Mon, 26 Apr 2010 09:10:44 -0700 [thread overview]
Message-ID: <20100426161044.GE2529@linux.vnet.ibm.com> (raw)
In-Reply-To: <s2ka44ae5cd1004251419hb8f4c137md0e399c464d9290a@mail.gmail.com>
On Sun, Apr 25, 2010 at 05:19:38PM -0400, Miles Lane wrote:
> [ 139.730133] [ INFO: suspicious rcu_dereference_check() usage. ]
> [ 139.730136] ---------------------------------------------------
> [ 139.730139] include/net/inet_timewait_sock.h:227 invoked
> rcu_dereference_check() without protection!
> [ 139.730142]
> [ 139.730143] other info that might help us debug this:
> [ 139.730144]
> [ 139.730147]
> [ 139.730148] rcu_scheduler_active = 1, debug_locks = 1
> [ 139.730151] 1 lock held by swapper/0:
> [ 139.730158] #0: (net/ipv4/tcp_minisocks.c:41){+.-...}, at:
> [<ffffffff81046ad2>] run_timer_softirq+0x19f/0x370
> [ 139.730169]
> [ 139.730170] stack backtrace:
> [ 139.730173] Pid: 0, comm: swapper Not tainted 2.6.34-rc5-git6 #28
> [ 139.730176] Call Trace:
> [ 139.730178] <IRQ> [<ffffffff81065f9a>] lockdep_rcu_dereference+0x9d/0xa5
> [ 139.730189] [<ffffffff813d1abf>] twsk_net+0x4f/0x57
> [ 139.730193] [<ffffffff813d2122>] __inet_twsk_kill+0x79/0xd0
> [ 139.730198] [<ffffffff813d24f9>] inet_twdr_do_twkill_work+0x59/0xba
> [ 139.730203] [<ffffffff813d263d>] inet_twdr_hangman+0x30/0x97
> [ 139.730207] [<ffffffff81046b9e>] run_timer_softirq+0x26b/0x370
> [ 139.730211] [<ffffffff81046ad2>] ? run_timer_softirq+0x19f/0x370
> [ 139.730216] [<ffffffff813d260d>] ? inet_twdr_hangman+0x0/0x97
> [ 139.730221] [<ffffffff81040230>] ? __do_softirq+0x7f/0x252
> [ 139.730225] [<ffffffff810402f5>] __do_softirq+0x144/0x252
> [ 139.730230] [<ffffffff8100320c>] call_softirq+0x1c/0x34
> [ 139.730235] [<ffffffff81004864>] do_softirq+0x38/0x80
> [ 139.730239] [<ffffffff8103fdc2>] irq_exit+0x45/0x94
> [ 139.730243] [<ffffffff81003fa9>] do_IRQ+0xad/0xc4
> [ 139.730247] [<ffffffff81432953>] ret_from_intr+0x0/0xf
> [ 139.730250] <EOI> [<ffffffff81248383>] ? acpi_idle_enter_bm+0x262/0x28d
> [ 139.730260] [<ffffffff81248379>] ? acpi_idle_enter_bm+0x258/0x28d
> [ 139.730266] [<ffffffff8137b9cf>] cpuidle_idle_call+0x9c/0x13d
> [ 139.730273] [<ffffffff810012c2>] cpu_idle+0xa5/0xfc
> [ 139.730277] [<ffffffff8142abdd>] start_secondary+0x1f3/0x1fc
This appears to be another symptom of the bug you located in your earlier
testing, so either Eric Biederman sends a patch or I improvise.
And thank you again for all your testing, Miles!!!
Thanx, Paul
prev parent reply other threads:[~2010-04-26 16:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-25 21:19 2.6.34-rc5-git6 (plus all patches) -- new INFO: suspicious rcu_dereference_check() usage Miles Lane
2010-04-25 21:19 ` Miles Lane
2010-04-26 16:10 ` Paul E. McKenney [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100426161044.GE2529@linux.vnet.ibm.com \
--to=paulmck@linux.vnet.ibm.com \
--cc=eparis@redhat.com \
--cc=eric.dumazet@gmail.com \
--cc=guijianfeng@cn.fujitsu.com \
--cc=jens.axboe@oracle.com \
--cc=johannes@sipsolutions.net \
--cc=laijs@cn.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=lizf@cn.fujitsu.com \
--cc=miles.lane@gmail.com \
--cc=mingo@elte.hu \
--cc=nauman@google.com \
--cc=netdev@vger.kernel.org \
--cc=peterz@infradead.org \
--cc=vgoyal@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.