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Date: Mon, 17 Mar 2014 22:38:13 +0100
From: Belisko Marek <marek.belisko@...il.com>
To: LKML <linux-kernel@...r.kernel.org>, zbr@...emap.net
Cc: "Dr. H. Nikolaus Schaller" <hns@...delico.com>
Subject: w1: 3.14-rc7 - possible recursive locking detected
Hi,
booting latest 3.14-rc7 on gta04 board gives following warning:
[ 3.101409] Driver for 1-wire Dallas network protocol.
[ 3.109649] omap_hdq omap_hdq: OMAP HDQ Hardware Rev 0.5. Driver in
Interrupt mode
[ 3.330810]
[ 3.332397] =============================================
[ 3.338073] [ INFO: possible recursive locking detected ]
[ 3.343749] 3.14.0-rc7-gta04 #520 Not tainted
[ 3.348327] ---------------------------------------------
[ 3.353973] w1_bus_master1/805 is trying to acquire lock:
[ 3.359649] (&(&priv->bus_notifier)->rwsem){.+.+.+}, at:
[<c005977c>] __blocking_notifier_call_chain+0x28/0x58
[ 3.370300]
[ 3.370300] but task is already holding lock:
[ 3.376434] (&(&priv->bus_notifier)->rwsem){.+.+.+}, at:
[<c005977c>] __blocking_notifier_call_chain+0x28/0x58
[ 3.387084]
[ 3.387084] other info that might help us debug this:
[ 3.393920] Possible unsafe locking scenario:
[ 3.393920]
[ 3.400146] CPU0
[ 3.402709] ----
[ 3.405273] lock(&(&priv->bus_notifier)->rwsem);
[ 3.410308] lock(&(&priv->bus_notifier)->rwsem);
[ 3.415374]
[ 3.415374] *** DEADLOCK ***
[ 3.415374]
[ 3.421569] May be due to missing lock nesting notation
[ 3.421569]
[ 3.428710] 2 locks held by w1_bus_master1/805:
[ 3.433471] #0: (&dev->mutex#2){+.+.+.}, at: [<c03bc5d4>]
w1_attach_slave_device+0xb8/0x1c4
[ 3.442504] #1: (&(&priv->bus_notifier)->rwsem){.+.+.+}, at:
[<c005977c>] __blocking_notifier_call_chain+0x28/0x58
[ 3.453582]
[ 3.453582] stack backtrace:
[ 3.458190] CPU: 0 PID: 805 Comm: w1_bus_master1 Not tainted
3.14.0-rc7-gta04 #520
[ 3.466156] [<c0014418>] (unwind_backtrace) from [<c0011788>]
(show_stack+0x10/0x14)
[ 3.474304] [<c0011788>] (show_stack) from [<c04ee204>]
(dump_stack+0x68/0x84)
[ 3.481933] [<c04ee204>] (dump_stack) from [<c007616c>]
(print_deadlock_bug+0xc0/0xf0)
[ 3.490264] [<c007616c>] (print_deadlock_bug) from [<c0077a34>]
(validate_chain.isra.27+0x4e0/0x538)
[ 3.499847] [<c0077a34>] (validate_chain.isra.27) from [<c0078864>]
(__lock_acquire+0x72c/0x838)
[ 3.509094] [<c0078864>] (__lock_acquire) from [<c0078f84>]
(lock_acquire+0xf4/0x118)
[ 3.517333] [<c0078f84>] (lock_acquire) from [<c04f69b0>]
(down_read+0x28/0x38)
[ 3.525024] [<c04f69b0>] (down_read) from [<c005977c>]
(__blocking_notifier_call_chain+0x28/0x58)
[ 3.534362] [<c005977c>] (__blocking_notifier_call_chain) from
[<c00597c0>] (blocking_notifier_call_chain+0x14/0x18)
[ 3.545440] [<c00597c0>] (blocking_notifier_call_chain) from
[<c0306940>] (device_add+0x1f4/0x368)
[ 3.554870] [<c0306940>] (device_add) from [<c030a158>]
(platform_device_add+0x138/0x1c8)
[ 3.563476] [<c030a158>] (platform_device_add) from [<c03bf31c>]
(w1_bq27000_add_slave+0x44/0x74)
[ 3.572784] [<c03bf31c>] (w1_bq27000_add_slave) from [<c03bca78>]
(w1_bus_notify.part.0+0x48/0xc8)
[ 3.582214] [<c03bca78>] (w1_bus_notify.part.0) from [<c04f996c>]
(notifier_call_chain+0x38/0x68)
[ 3.591522] [<c04f996c>] (notifier_call_chain) from [<c0059798>]
(__blocking_notifier_call_chain+0x44/0x58)
[ 3.601776] [<c0059798>] (__blocking_notifier_call_chain) from
[<c00597c0>] (blocking_notifier_call_chain+0x14/0x18)
[ 3.612823] [<c00597c0>] (blocking_notifier_call_chain) from
[<c0306940>] (device_add+0x1f4/0x368)
[ 3.622253] [<c0306940>] (device_add) from [<c03bc4a0>]
(__w1_attach_slave_device+0x9c/0x118)
[ 3.631225] [<c03bc4a0>] (__w1_attach_slave_device) from
[<c03bc644>] (w1_attach_slave_device+0x128/0x1c4)
[ 3.641357] [<c03bc644>] (w1_attach_slave_device) from [<c03bc75c>]
(w1_slave_found+0x7c/0x98)
[ 3.650421] [<c03bc75c>] (w1_slave_found) from [<c03bea10>]
(omap_w1_search_bus+0x54/0x5c)
[ 3.659118] [<c03bea10>] (omap_w1_search_bus) from [<c03be950>]
(w1_search_devices+0x3c/0x48)
[ 3.668090] [<c03be950>] (w1_search_devices) from [<c03bd210>]
(w1_search_process_cb+0x4c/0xc4)
[ 3.677215] [<c03bd210>] (w1_search_process_cb) from [<c03bd2e0>]
(w1_process+0x58/0x10c)
[ 3.685821] [<c03bd2e0>] (w1_process) from [<c0055850>] (kthread+0xc8/0xdc)
[ 3.693145] [<c0055850>] (kthread) from [<c000dc68>]
(ret_from_fork+0x14/0x2c)
[ 3.751068] omap_wdt: OMAP Watchdog Timer Rev 0x31: initial timeout 60 sec
AFAIK we didn't see that on (at least 3/14-rc2).
BR,
marek
--
as simple and primitive as possible
-------------------------------------------------
Marek Belisko - OPEN-NANDRA
Freelance Developer
Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
Tel: +421 915 052 184
skype: marekwhite
twitter: #opennandra
web: http://open-nandra.com
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