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Date: Thu, 03 Dec 2009 17:26:23 +0100
From: Michal Simek <michal.simek@...alogix.com>
To: LKML <linux-kernel@...r.kernel.org>
CC: akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
matthew@....cx, Arnd Bergmann <arnd@...db.de>,
John Williams <john.williams@...alogix.com>
Subject: Inconsistent lock state - finish_task_switch/sched.c
Hi All,
I am trying to find out one inconsistent lock state.
I haven't had any experience with it. I found Matthew's explanation
(http://lkml.org/lkml/2008/6/4/1).
Below is log for Microblaze which points to finish_task_switch in
sched.c. I am not sure if is arch specific problem or not.
BTW: The backtraces below are wrong because Microblaze miss frame pointer.
Thanks for your advices,
Michal
Linux version 2.6.32-00043-g62a59b0 (monstr@...str.eu) (gcc version
4.1.2) #12 Thu Dec 3 16:42:36 CET 2009
setup_cpuinfo: initialising
setup_cpuinfo: Using full CPU PVR support
setup_memory: max_mapnr: 0x10000
setup_memory: min_low_pfn: 0x90000
setup_memory: max_low_pfn: 0xa0000
On node 0 totalpages: 65536
free_area_init_node: node 0, pgdat c0337554, node_mem_map c0e4a000
Normal zone: 512 pages used for memmap
Normal zone: 0 pages reserved
Normal zone: 65024 pages, LIFO batch:15
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 65024
Kernel command line: console=ttyUL0,115200
PID hash table entries: 1024 (order: 0, 4096 bytes)
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 244864k/262144k available
Hierarchical RCU implementation.
NR_IRQS:32
xlnx,xps-intc-1.00.a #0 at 0xd0000000, num_irq=9, edge=0x100
xlnx,xps-timer-1.00.a #0 at 0xd0004000, irq=3
microblaze_timer_set_mode: shutdown
microblaze_timer_set_mode: periodic
Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
... MAX_LOCKDEP_SUBCLASSES: 8
... MAX_LOCK_DEPTH: 48
... MAX_LOCKDEP_KEYS: 8191
... CLASSHASH_SIZE: 4096
... MAX_LOCKDEP_ENTRIES: 16384
... MAX_LOCKDEP_CHAINS: 32768
... CHAINHASH_SIZE: 16384
memory used by lock dependency info: 3567 kB
per task-struct memory footprint: 1152 bytes
------------------------
| Locking API testsuite:
----------------------------------------------------------------------------
| spin |wlock |rlock |mutex | wsem |
rsem |
--------------------------------------------------------------------------
A-A deadlock: ok | ok | ok | ok | ok |
ok |
A-B-B-A deadlock: ok | ok | ok | ok | ok |
ok |
A-B-B-C-C-A deadlock: ok | ok | ok | ok | ok |
ok |
A-B-C-A-B-C deadlock: ok | ok | ok | ok | ok |
ok |
A-B-B-C-C-D-D-A deadlock: ok | ok | ok | ok | ok |
ok |
A-B-C-D-B-D-D-A deadlock: ok | ok | ok | ok | ok |
ok |
A-B-C-D-B-C-D-A deadlock: ok | ok | ok | ok | ok |
ok |
double unlock: ok | ok | ok | ok | ok |
ok |
initialize held: ok | ok | ok | ok | ok |
ok |
bad unlock order: ok | ok | ok | ok | ok |
ok |
--------------------------------------------------------------------------
recursive read-lock: | ok | |
ok |
recursive read-lock #2: | ok | |
ok |
mixed read-write-lock: | ok | |
ok |
mixed write-read-lock: | ok | |
ok |
--------------------------------------------------------------------------
hard-irqs-on + irq-safe-A/12: ok | ok | ok |
soft-irqs-on + irq-safe-A/12: ok | ok | ok |
hard-irqs-on + irq-safe-A/21: ok | ok | ok |
soft-irqs-on + irq-safe-A/21: ok | ok | ok |
sirq-safe-A => hirqs-on/12: ok | ok | ok |
sirq-safe-A => hirqs-on/21: ok | ok | ok |
hard-safe-A + irqs-on/12: ok | ok | ok |
soft-safe-A + irqs-on/12: ok | ok | ok |
hard-safe-A + irqs-on/21: ok | ok | ok |
soft-safe-A + irqs-on/21: ok | ok | ok |
hard-safe-A + unsafe-B #1/123: ok | ok | ok |
soft-safe-A + unsafe-B #1/123: ok | ok | ok |
hard-safe-A + unsafe-B #1/132: ok | ok | ok |
soft-safe-A + unsafe-B #1/132: ok | ok | ok |
hard-safe-A + unsafe-B #1/213: ok | ok | ok |
soft-safe-A + unsafe-B #1/213: ok | ok | ok |
hard-safe-A + unsafe-B #1/231: ok | ok | ok |
soft-safe-A + unsafe-B #1/231: ok | ok | ok |
hard-safe-A + unsafe-B #1/312: ok | ok | ok |
soft-safe-A + unsafe-B #1/312: ok | ok | ok |
hard-safe-A + unsafe-B #1/321: ok | ok | ok |
soft-safe-A + unsafe-B #1/321: ok | ok | ok |
hard-safe-A + unsafe-B #2/123: ok | ok | ok |
soft-safe-A + unsafe-B #2/123: ok | ok | ok |
hard-safe-A + unsafe-B #2/132: ok | ok | ok |
soft-safe-A + unsafe-B #2/132: ok | ok | ok |
hard-safe-A + unsafe-B #2/213: ok | ok | ok |
soft-safe-A + unsafe-B #2/213: ok | ok | ok |
hard-safe-A + unsafe-B #2/231: ok | ok | ok |
soft-safe-A + unsafe-B #2/231: ok | ok | ok |
hard-safe-A + unsafe-B #2/312: ok | ok | ok |
soft-safe-A + unsafe-B #2/312: ok | ok | ok |
hard-safe-A + unsafe-B #2/321: ok | ok | ok |
soft-safe-A + unsafe-B #2/321: ok | ok | ok |
hard-irq lock-inversion/123: ok | ok | ok |
soft-irq lock-inversion/123: ok | ok | ok |
hard-irq lock-inversion/132: ok | ok | ok |
soft-irq lock-inversion/132: ok | ok | ok |
hard-irq lock-inversion/213: ok | ok | ok |
soft-irq lock-inversion/213: ok | ok | ok |
hard-irq lock-inversion/231: ok | ok | ok |
soft-irq lock-inversion/231: ok | ok | ok |
hard-irq lock-inversion/312: ok | ok | ok |
soft-irq lock-inversion/312: ok | ok | ok |
hard-irq lock-inversion/321: ok | ok | ok |
soft-irq lock-inversion/321: ok | ok | ok |
hard-irq read-recursion/123: ok |
soft-irq read-recursion/123: ok |
hard-irq read-recursion/132: ok |
soft-irq read-recursion/132: ok |
hard-irq read-recursion/213: ok |
soft-irq read-recursion/213: ok |
hard-irq read-recursion/231: ok |
soft-irq read-recursion/231: ok |
hard-irq read-recursion/312: ok |
soft-irq read-recursion/312: ok |
hard-irq read-recursion/321: ok |
soft-irq read-recursion/321: ok |
-------------------------------------------------------
Good, all 218 testcases passed! |
---------------------------------
Calibrating delay loop... 59.80 BogoMIPS (lpj=299008)
Mount-cache hash table entries: 512
=================================
[ INFO: inconsistent lock state ]
2.6.32-00043-g62a59b0 #12
---------------------------------
inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
swapper/1 [HC0[0]:SC0[0]:HE0:SE1] takes:
(&rq->lock){?.-...}, at: [<c000f148>] finish_task_switch+0x0/0x178
{IN-HARDIRQ-W} state was registered at:
[<c0016478>] release_console_sem+0x50/0x2d8
[<c0046214>] mark_lock+0x2f4/0x6ac
[<c00492f8>] __lock_acquire+0x908/0xbb8
[<c001707c>] vprintk+0x2a4/0x550
[<c0048cfc>] __lock_acquire+0x30c/0xbb8
[<c00495f8>] lock_acquire+0x50/0x80
[<c0024374>] do_timer+0x40/0x68
[<c0048bfc>] __lock_acquire+0x20c/0xbb8
[<c0280d3c>] _spin_lock+0x38/0x64
[<c00120f0>] scheduler_tick+0x2c/0x13c
[<c00120e8>] scheduler_tick+0x24/0x13c
[<c00243b8>] run_local_timers+0x1c/0x44
[<c00120f0>] scheduler_tick+0x2c/0x13c
[<c0024438>] update_process_times+0x58/0x88
[<c002442c>] update_process_times+0x4c/0x88
[<c0042d30>] tick_periodic+0x30/0x110
[<c0042dec>] tick_periodic+0xec/0x110
[<c0042dc4>] tick_periodic+0xc4/0x110
[<c0042e3c>] tick_handle_periodic+0x2c/0x150
[<c00495f8>] lock_acquire+0x50/0x80
[<c0280af4>] _spin_unlock_irqrestore+0x2c/0x90
[<c0005ff4>] timer_interrupt+0x30/0x50
[<c0050f58>] handle_IRQ_event+0x58/0x1e8
[<c0280b88>] _spin_unlock+0x30/0x50
[<c00540d8>] handle_level_irq+0xa4/0x16c
[<c00540c8>] handle_level_irq+0x94/0x16c
[<c0001b2c>] do_IRQ+0x7c/0x108
[<c0001ae0>] do_IRQ+0x30/0x108
[<c0008b20>] irq_call+0x0/0x8
[<c0280e90>] _spin_lock_irqsave+0x30/0x8c
[<c0280b1c>] _spin_unlock_irqrestore+0x54/0x90
[<c0042628>] clockevents_register_device+0xf8/0x194
[<c00425a8>] clockevents_register_device+0x78/0x194
[<c0042630>] clockevents_register_device+0x100/0x194
[<c0339a6c>] start_kernel+0x2d4/0x4e4
[<c0339a74>] start_kernel+0x2dc/0x4e4
[<c0339a7c>] start_kernel+0x2e4/0x4e4
[<c00065b0>] machine_halt+0x0/0x24
[<c001667c>] release_console_sem+0x254/0x2d8
irq event stamp: 0
hardirqs last enabled at (0): [<(null)>] (null)
hardirqs last disabled at (0): [<c001358c>] copy_process+0x33c/0x1200
softirqs last enabled at (0): [<c001358c>] copy_process+0x33c/0x1200
softirqs last disabled at (0): [<(null)>] (null)
other info that might help us debug this:
no locks held by swapper/1.
stack backtrace:
Stack:
cf833de8 00000000 cf833e00 c028ee58 cf833e08 cf833e00 c0046594 c028e584
c02b7568 c001667c 00000000 00000002 00000000 00000000 00000000 00000001
cf833e3c 00000000 00000000 00000002 cf8313b4 c00490c4 cf83111c cf831210
Call Trace:
[<c0046594>] mark_lock+0x674/0x6ac
[<c001667c>] release_console_sem+0x254/0x2d8
[<c00490c4>] __lock_acquire+0x6d4/0xbb8
[<c001a24c>] do_exit+0xcc/0x7a4
[<c0280d1c>] _spin_lock+0x18/0x64
[<c001a2b0>] do_exit+0x130/0x7a4
[<c00495f8>] lock_acquire+0x50/0x80
[<c000f1a8>] finish_task_switch+0x60/0x178
[<c000f148>] finish_task_switch+0x0/0x178
[<c0010aa4>] schedule_tail+0x18/0x88
[<c0018620>] exit_mm+0x248/0x268
[<c000f148>] finish_task_switch+0x0/0x178
[<c0007e94>] ret_from_fork+0x4/0x20
[<c0007f88>] full_exception_trap+0x28/0x210
[<c03391c0>] kernel_init+0x0/0x194
[<c0002628>] kernel_thread_helper+0x0/0x28
INFO: lockdep is turned off.
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
Switching to clocksource microblaze_clocksource
NET: Registered protocol family 2
IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
TCP established hash table entries: 8192 (order: 4, 65536 bytes)
TCP bind hash table entries: 8192 (order: 6, 262144 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP reno registered
NET: Registered protocol family 1
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Slow work thread pool: Starting up
Slow work thread pool: Ready
msgmni has been set to 478
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
84000000.serial: ttyUL0 at MMIO 0x84000003 (irq = 8) is a uartlite
console [ttyUL0] enabled
brd: module loaded
TCP cubic registered
NET: Registered protocol family 17
Freeing unused kernel memory: 6220k freed
Mounting proc:
Mounting var:
Populating /var:
Running local start scripts.
Mounting sysfs:
Setting hostname:
Setting up interface lo:
Setting up interface eth0:
ifconfig: SIOCSIFADDR: No such device
Starting syslogd:
Starting httpd:
Mounting nfs server
uclinux login:
--
Michal Simek, Ing. (M.Eng)
PetaLogix - Linux Solutions for a Reconfigurable World
w: www.petalogix.com p: +61-7-30090663,+42-0-721842854 f: +61-7-30090663
--
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