From: Christian Lamparter <chunkeey@googlemail.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Kalle Valo <kvalo@codeaurora.org>,
linux-wireless@vger.kernel.org, netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Dmitry Vyukov <dvyukov@google.com>,
Kostya Serebryany <kcc@google.com>,
syzkaller <syzkaller@googlegroups.com>,
Stephen Boyd <sboyd@codeaurora.org>, Tejun Heo <tj@kernel.org>,
Yong Zhang <yong.zhang0@gmail.com>
Subject: Re: usb/net/p54: trying to register non-static key in p54_unregister_leds
Date: Wed, 20 Sep 2017 21:27:42 +0200 [thread overview]
Message-ID: <2277141.bYDD1vAb9W@debian64> (raw)
In-Reply-To: <CAAeHK+xPoNn7i5xOzEqHX6tfDpmpb1rd0hcAxZpTHKi6B8xzsw@mail.gmail.com>
On Wednesday, September 20, 2017 8:37:08 PM CEST Andrey Konovalov wrote:
> Hi!
>
> I've got the following report while fuzzing the kernel with syzkaller.
>
> On commit ebb2c2437d8008d46796902ff390653822af6cc4 (Sep 18).
>
> INFO: trying to register non-static key.
> the code is fine but needs lockdep annotation.
> turning off the locking correctness validator.
> CPU: 1 PID: 1404 Comm: kworker/1:1 Not tainted
> 4.14.0-rc1-42251-gebb2c2437d80-dirty #205
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> Workqueue: usb_hub_wq hub_event
> Call Trace:
> __dump_stack lib/dump_stack.c:16
> dump_stack+0x292/0x395 lib/dump_stack.c:52
> register_lock_class+0x6c4/0x1a00 kernel/locking/lockdep.c:769
> __lock_acquire+0x27e/0x4550 kernel/locking/lockdep.c:3385
> lock_acquire+0x259/0x620 kernel/locking/lockdep.c:4002
> flush_work+0xf0/0x8c0 kernel/workqueue.c:2886
> __cancel_work_timer+0x51d/0x870 kernel/workqueue.c:2961
> cancel_delayed_work_sync+0x1f/0x30 kernel/workqueue.c:3081
> p54_unregister_leds+0x6c/0xc0 drivers/net/wireless/intersil/p54/led.c:160
> p54_unregister_common+0x3d/0xb0 drivers/net/wireless/intersil/p54/main.c:856
> p54u_disconnect+0x86/0x120 drivers/net/wireless/intersil/p54/p54usb.c:1073
> usb_unbind_interface+0x21c/0xa90 drivers/usb/core/driver.c:423
> __device_release_driver drivers/base/dd.c:861
> device_release_driver_internal+0x4f4/0x5c0 drivers/base/dd.c:893
> device_release_driver+0x1e/0x30 drivers/base/dd.c:918
> bus_remove_device+0x2f4/0x4b0 drivers/base/bus.c:565
> device_del+0x5c4/0xab0 drivers/base/core.c:1985
> usb_disable_device+0x1e9/0x680 drivers/usb/core/message.c:1170
> usb_disconnect+0x260/0x7a0 drivers/usb/core/hub.c:2124
> hub_port_connect drivers/usb/core/hub.c:4754
> hub_port_connect_change drivers/usb/core/hub.c:5009
> port_event drivers/usb/core/hub.c:5115
> hub_event+0x1318/0x3740 drivers/usb/core/hub.c:5195
> process_one_work+0xc7f/0x1db0 kernel/workqueue.c:2119
> process_scheduled_works kernel/workqueue.c:2179
> worker_thread+0xb2b/0x1850 kernel/workqueue.c:2255
> kthread+0x3a1/0x470 kernel/kthread.c:231
> ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431
>
It seems this is caused as a result of:
-> lock_map_acquire(&work->lockdep_map);
lock_map_release(&work->lockdep_map);
in flush_work() [0]
This was added by:
commit 0976dfc1d0cd80a4e9dfaf87bd8744612bde475a
Author: Stephen Boyd <sboyd@codeaurora.org>
Date: Fri Apr 20 17:28:50 2012 -0700
workqueue: Catch more locking problems with flush_work()
Looking at the Stephen's patch, it's clear that it was made
with "static DECLARE_WORK(work, my_work)" in mind. However
p54's led_work is "per-device", hence it is stored in the
devices context p54_common, which is dynamically allocated.
So, maybe revert Stephen's patch?
[0] <http://elixir.free-electrons.com/linux/latest/source/kernel/workqueue.c#L2853>
next prev parent reply other threads:[~2017-09-20 19:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-20 18:37 usb/net/p54: trying to register non-static key in p54_unregister_leds Andrey Konovalov
2017-09-20 19:27 ` Christian Lamparter [this message]
2017-09-20 19:55 ` Johannes Berg
2017-09-21 18:22 ` Andrey Konovalov
2017-09-23 19:37 ` [RESEND] " Christian Lamparter
2017-09-24 14:13 ` Johannes Berg
2017-09-26 15:06 ` Andrey Konovalov
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