Messages in this thread | | | Date | Mon, 17 Mar 2014 22:38:13 +0100 | Subject | w1: 3.14-rc7 - possible recursive locking detected | From | Belisko Marek <> |
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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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